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  • IPEN-DOC 28126

    SOUZA, CARLA D. de ; NOGUEIRA, BEATRIZ R. ; ZEITUNI, CARLOS A. ; ROSTELATO, MARIA E.C.M. . Radioactive nanoparticles and their biomedical application in nanobrachytherapy. In: KESHARWANI, PRASHANT (Ed.); SINGH, KAMALINDER K. (Ed.). Nanoparticle Therapeutics: Production Technologies, Types of Nanoparticles, and Regulatory Aspects. London, United Kingdom: Academic Press, 2021. p. 529-560, cap. 15. DOI: 10.1016/B978-0-12-820757-4.00012-0

    Palavras-Chave: nanoparticles; brachytherapy; radiation sources; radiotherapy; nanotechnology

  • IPEN-DOC 28125

    NUNES, R.P.; BONATTO, A.; MALDONADO, E.P.; SAMAD, R.E. ; VIEIRA JUNIOR, N.D. . Simulation study of laser wakefield acceleration varying the down-ramp length of a gas jet. In: LIN, LIU (Ed.); BYRD, JOHN M. (Ed.); NEUENSCHWANDER, REGIS (Ed.); PICORETI, RENAN (Ed.); SCHAA, VOLKER R.W. (Ed.) INTERNATIONAL PARTICLE ACCELERATOR CONFERENCE, 12th, May 24-28, 2021, Campinas, SP. Proceedings... Geneva, Switzerland: JACoW Publishing, 2021. p. 1717-1720. DOI: 10.18429/JACoW-IPAC2021-TUPAB142

    Abstract: In this work, particle-in-cell simulations were carried out to investigate the role of the down-ramp length of a H2 gas jet in accelerating electrons ionized by the laser pulse. The laser and plasma density were chosen so that the system is operating in the self-modulated regime. Preliminary results show how the down-ramp length can control the injection of electrons in the first bubble induced in the plasma by the laser pulse.

    Palavras-Chave: wakefield accelerators; gases; electron density; lasers; pulses; electric fields

  • IPEN-DOC 28124

    NUNES, R.P.; BONATTO, A.; MALDONADO, E.P.; SAMAD, R.E. ; VIEIRA JUNIOR, N.D. . Laser pulse dynamics in the self-modulated regime. In: LIN, LIU (Ed.); BYRD, JOHN M. (Ed.); NEUENSCHWANDER, REGIS (Ed.); PICORETI, RENAN (Ed.); SCHAA, VOLKER R.W. (Ed.) INTERNATIONAL PARTICLE ACCELERATOR CONFERENCE, 12th, May 24-28, 2021, Campinas, SP. Proceedings... Geneva, Switzerland: JACoW Publishing, 2021. p. 1721-1724. DOI: 10.18429/JACoW-IPAC2021-TUPAB143

    Abstract: In this work, particle-in-cell simulations were carried out to investigate the dynamics of a laser pulse propagating along a H2 gas jet. The laser-driven wakefield and the density of ionized electrons are analyzed during the pulse propagation through the gas jet. The laser and plasma quantities were chosen in order to have the system operating in the self-modulated regime. Results show how the self-modulation fragments the laser pulse, originating higher-amplitude pulses that can induce bubble formation with wave-breaking and particle injection.

    Palavras-Chave: electron density; plasma simulation; wakefield accelerators; lasers; pulses

  • IPEN-DOC 28123

    SZABO, T.V.; NETO, F.A.B.; MORAES, I.C.; OLIVEIRA, H.B. de ; GUILLAUMON, P.V.. FLUKA simulations of 225Ac production using electron accelerators: validation through comparison with published experiments. In: LIN, LIU (Ed.); BYRD, JOHN M. (Ed.); NEUENSCHWANDER, REGIS (Ed.); PICORETI, RENAN (Ed.); SCHAA, VOLKER R.W. (Ed.) INTERNATIONAL PARTICLE ACCELERATOR CONFERENCE, 12th, May 24-28, 2021, Campinas, SP. Proceedings... Geneva, Switzerland: JACoW Publishing, 2021. p. 1226-1228. DOI: 10.18429/JACoW-IPAC2021-MOPAB409

    Abstract: Targeted Alpha Therapy (TAT) is an active area of study worldwide. This technique has shown a potential in nuclear medicine to treat metastatic disease by alpha particles that deposit energy in small regions nearby cancer cells. 225Ac is an important alpha-emitting that can be used for cancer TAT. This radioisotope shows good potential for medical applications, therefore it is important to study ways of increase its production and availability. One possible path for the 225Ac production is to irradiate a radium target (226Ra) on a linear electron accelerator (LINAC). Isotope production studies could be implemented using computational tools. In this work, Monte Carlo simulations with FLUKA code were performed and compared to experimental results. We studied 225Ac production by photonuclear reactions using a 24 MeV electron beam LINAC hitting a tungsten electron-photon converter. Different energies and geometries were also simulated to obtain optimal production conditions. The specific activity values obtained with simulations had a good agreement with published experimental results.

    Palavras-Chave: electron beams; radioisotopes; actinium 225; computer codes; calculation methods; monte carlo method

  • IPEN-DOC 28122

    DEL-VALLE, M. ; SANTOS, M.O. ; SANTOS, S.N. dos ; BERNARDES, E.S. ; ZEZELL, D.M. . Breast cancer estrogen and progesterone receptors evaluation using FTlR spectroscopy imaging: a pilot study. In: IUPAB CONGRESS; ANNUAL SBBF MEETING; ANNUAL SBBQ MEETING, October 26-30, 2020, Foz do Iguaçu, PR. Abstract... 2020.

    Abstract: INTRODUCTION. Breast cancer is the second leading cause of cancer death in woman worldwide with an incidence of 2.09 million and 627 thousand deaths in 2018. Histopathology is the gold standard method for cancer diagnosis and identification of therapeutic targets, however it still presents interpretation difficulties, especially when comparing different cancer subtypes. OBJETICVE: The aim of this study was to evaluate Fourier transform infrared (FTIR) spectroscopy in the diagnose and differentiation of molecular differences between two different breast cancer subtypes: positive and negative for estrogen (ER) and progesterone (PR) receptors. METHODS: Two human breast cell lines, BT474 (ER and PR positive) and SKBR3 (ER and PR negative), were inoculated in Balb/c nude mice. Tumors were collected when reached 0.5 cm3, processed by formalin fixation and paraffin embedding. 5μm thick tissue cuts were fixed in low-e slides (MirrIR, Kevley Technologies). Spectral images were performed in a micro-FTIR (Cary 660, Agilent Technologies) with 32 x 32 FPA of 5.5 μm pixel size. Scattering correction (RMieS-EMSC) was performed using MATLAB and remaining processing using Python. Groups differentiation were evaluated by PCA from 1350 to 1000 cm-1 second derivatives. RESULTS AND DISCUSSION: Groups were split in two clusters, separated by PC-1 with a 99 % accuracy in both groups and 45 % of explained variance. The absorptions in the selected region for the PCA were mainly related to DNA, RNA and protein content. The main contribution was presented by the 1238 cm-1 peak, which was correlated with nucleic acids symmetrical stretching. Hyperspectral image built from this peak presented a spatial correlation with the microscope white light imaging, indicating that possible region for histopathological correlation might be present. CONCLUSAO: Our pilot study shows that FTIR spectroscopy imaging can distinguish ER/PR positive from negative breast cancer subtypes.

    Palavras-Chave: neoplasms; mammary glands; diagnostic techniques; histology; fourier transformation; infrared spectra

  • IPEN-DOC 28121

    RADAELLI, C.R. de M. ; ANTUNES, A. ; CAI, S.; ZEZELL, D.M. ; GOUW-SOARES, S. . Effect of a diode laser irradiation in root canals contamined with Enterococcus faecalis: “In vitro” study. In: INTERNATIONAL CONGRESS ON LASERS IN DENTISTRY, 8th; ANNUAL MEETING OF THE JAPANESE SOCIETY FOR LASER DENTISTRY, 14th, July 31 - August 2, 2002, Yokohama, Japan. Abstract... Aachen, Alemanha: International Society for Laser in Dentistry, 2002. p. 48-48.

    Abstract: High success rates were achieved in conventional endodontic treatment of vital pulp teelh. However, in non-vital pulp a decrease of success occurs due to difficulties to achieve a complete disinfection of root canal system. Some bacteria, such as Enterococcus faecalis, are frequently found in endodontic treatment failure due to their high resistance to the usual process of canal shaping and cleaning. The purpose of this work was to evaluate the effectiveness of a diode laser irradiation in bacterial reduction of contaminated canals as well as to analyze the effect of the laser irradiation associated with the use of calcium hydroxide paste. Eighty two root canals infected with Enterococcus faecalis suspension (1x10(6) CFU/ml) were irradiated with a high power diode laser (810nm, Opus 10- Sharplan - Israel) with two different parameters: 2.5W and 3 W (cw), using a 360 μm fiber at an angle of approximately 5 degrees to the dentine surface during 5 seconds in 5 applications, within 20 seconds intervals between. Temperature was monitored at apex using a K-pipe thermocouple. Maximum temperature was 7.45ºC. After these proceedings specimens were vortexed in peptone water and dilutions performed. Aliquots were plated on m-Enterococcus agar. Colonies Forming Units (CFU) of all groups was counted. Statistically the results showed a significant reduction of bacteria on all groups after laser irradiation. A high reduction rate was achieved: 98.5% immediately after laser irradiation; 48 hours after, the reduction rate was 96.73% and finally a 100% reduction was achieved with the association of laser irradiation and calcium hydroxide paste. These high rates of bacteria reduction were achieved using the parameter of 3W (cw), 4.24 KW/cm2. The use of high power diode laser 810nm is highly efficient and suitable to reduce Enterococcus faecalis in infected root canals.

    Palavras-Chave: laser radiation; diode tubes; dentistry; teeth; bacterial diseases

  • IPEN-DOC 28120

    GOUW-SOARES, S. ; STABHOLZ, A.; LAGE-MARQUES, J.L. ; ZEZELL, D.M. ; EDUARDO, C.P. . Comparative study of dentine permeability after apicectomy and surface treatment with 9.6 μm CO2 and Er:YAG laser irradiation. In: INTERNATIONAL CONGRESS ON LASERS IN DENTISTRY, 8th; ANNUAL MEETING OF THE JAPANESE SOCIETY FOR LASER DENTISTRY, 14th, July 31 - August 2, 2002, Yokohama, Japan. Abstract... Aachen, Alemanha: International Society for Laser in Dentistry, 2002. p. 52-52.

    Abstract: Failure of the apicectomies is generally attributed to dentine surface permeability and to the lack of an adequate marginal sealing of the retrofilling material which allow the percolation of microorganisms and their products from the root canal system to the periodontal region compromising the periapical healing. The purpose of this study was to evaluate the dentine and the marginal permeability after apicectomy and surface treatment with 9.6μm CO2 laser and 2.94μm Er:YAG laser irradiation. Sixty-five single rooted human endodontically treated teeth were divided in five experimental groups: group I (control), the apicectomy performed with high speed bur; group II, similar procedure to the group I followed by dentinal surface treatment with the 9.6μm CO2 laser; group III, similar procedure to group 1 followed by dentinal surface treatment with the Er:YAG laser; group IV, apicectomy and surface treatment with 9.6μm CO2 laser, and the group V, apicectomy and surface treatment with the Er:YAG laser. The analysis of methylene blue dye infiltration through the dentinal surface and the retrofilling material demonstrated that the samples from the groups which were irradiated with the lasers showed significantly less infiltration indexes than the ones from the control group. These results were compatible to the structural morphological changes evidenced through the SEM analysis. The samples from the groups II and IV (9.6μm CO2 laser) showed clean smooth surfaces, fusion and recrystallized dentine distributed homogeneously throughout the irradiated area sealing the dentinal tubules. The samples from the groups III and V (Er:YAG laser 2.94μm) also presented clean surfaces, without smear layer but slightly rough compatible to the ablationed dentine and without evidence of dentinal tubules. Through the conditions of this study, the Er:YAG 2.94μm and the 9.6μm CO2 laser used for root canal resection and dentine surface treatment showed a reduction of permeability to methylene blue dye.

    Palavras-Chave: dentistry; teeth; permeability; laser radiation; surface treatments; lasers

  • IPEN-DOC 28119

    ZEZELL, D.M. ; BACHMANN, L. ; DIEBOLDER, R.; HIBST, R.. Infrared absorption bands characterization of dentin tissue when irradiated by erbium laser. In: INTERNATIONAL CONGRESS ON LASERS IN DENTISTRY, 8th; ANNUAL MEETING OF THE JAPANESE SOCIETY FOR LASER DENTISTRY, 14th, July 31 - August 2, 2002, Yokohama, Japan. Abstract... Aachen, Alemanha: International Society for Laser in Dentistry, 2002. p. 57-57.

    Abstract: The erbium laser radiation is highly absorbed by water molecules present in hard tissues. Erbium laser irradiation effects can be classified in two different regimens: ablative, which produces material removal or sub-ablative, that produces a controlled heated process in the irradiated and adjacent regions. For the Er:YAG laser the ablative threshold is very low, around 1.5J/cm2. When dentin is irradiated bellow threshold, chemical and physical changes can occur. The objective of this work is to identify the infrared absorption changes at dentin tissue induced by the Er:YAG laser irradiation al 2.94 μm with sub-ablative energy densities. In this work it were used energy densities between 0.365 J/cm2 and 1.94 J/cm2 to irradiate 0.5mm slices of bovine dentin. For the infrared analysis a Fourier Transform Infrared spectrometer was used. The studied region was between 4000 cm-1 and 400cm-1 (2.5μm and 25μm). After the laser irradiation, two main changes were observed in the analyzed spectral region: loss of water and alteration in the structure of organic matrix. These alterations can be identified by intensity decrease of the water band between 3800cm-1 and 2800cm-1 and in those bands between 1400cm-1 and 1100cm-1. Only a partial reversion of the water band pattern was observed after 24 hours of hydration, suggesting that erbium laser produces an irreversible alteration in the structure of the organic matrix when irradiated with energy densities bellow the ablation threshold.

    Palavras-Chave: dentistry; dentin; erbium; lasers; infrared spectra; absorption

  • IPEN-DOC 28118

    ANTUNES, A. ; VIANNA, S.S.; GOMES, A.S.L.; ROSSI, W. de ; ZEZELL, D.M. . Examination of dental hard tissues after short pulse Nd:YAG laser irradiation: morphological and chemical analysis. In: INTERNATIONAL CONGRESS ON LASERS IN DENTISTRY, 8th; ANNUAL MEETING OF THE JAPANESE SOCIETY FOR LASER DENTISTRY, 14th, July 31 - August 2, 2002, Yokohama, Japan. Abstract... Aachen, Alemanha: International Society for Laser in Dentistry, 2002. p. 77-77.

    Abstract: In the course of high intensity laser irradiation, expressive chemical and physical alteration may be induced in the irradiated dental tissues. We used short pulse Nd:YAG laser, with which damage in the tissue is reduced and thermal load can be better controlled. The use of nano and picosecond pulselengh also assures better accuracy in affected zone as well a smaller deepness. In one of the experiments, specimens were irradiated with different energy densities in a unique track of the laser beam on the enamel surface. Laser parameters used were: pulse width 6ns, energy densities from 10J/cm2 to 40J/cm2 and focused beam diameter of 0.1cm. In this case, the area of affected zone was 3 times higher than expected. In other experiment, bursts of shorter laser pulse width were used. In this case the laser emissin was formed by bursts composed of a train of 10 pulses with 100 ns of pulse width each. Energy densities from 10J/cm2 to 22.5J/cm2 and a focused beam diameter of 0.06cm were used. Heat affected zone was determined by Scanning Electron Microscopy, which showed a direct relationship between energy employed and morphological changes and as a result of dental tissue damage dimension.

    Palavras-Chave: dentistry; neodymium lasers; laser radiation; teeth; enamels

  • IPEN-DOC 28117

    CECCHINI, SILVIA C.M.; ZEZELL, DENISE M. ; BACHMANN, LUCIANO; PINOTTI, MARCOS; NOGUEIRA, GESSE E.C.; EDUARDO, CARLOS P.. Safe use of lasers In endodontics: thermal considerations [Er:YAG]. In: ANNUAL CONFERENCE AND EXHIBITION OF ACADEMY OF LASER DENTISTRY, 6th, February 3-6, 1999, Palm Springs, CA, USA. Abstract... Coral Springs, FL, USA: Academy of Laser Dentistry, 1999. p. 33-33.

    Abstract: The purpose of this study was to determine safe parameters for intracanal laser irradiation, since excessive heat at the root surface may cause damage to the periradicular tissues. The effect of laser treatment irradiation on temperature rise and the morphological-related changes on root canal surfaces were determined using thermocouple probe measurements and scanning electron microscopy, respectively. Single-rooted, extracted teeth were irradiated with the pulsed Er:YAG laser (2.94 μm) using a 375-μm diameter fiberoptic probe placed in the root canal. Teeth were maintained in a 37°C water bath and temperature changes recorded as root canals were lased. Laser parameters were 40 mJ and 80 mJ/ pulse, measured at the fiber end, and repetition rate of 10Hz. The root canals were irradiated for four periods with 20-second breaks in between, slowly moving the laser fiber from the apical to coronal surfaces in a continuous, circling fashion at 2 mm/sec. The range of 2.0°C to 4.0°C temperature rise was measured. Laser parameters that produced temperature rise at the root surface below 10ºC were considered safe to the periradicular tissues during intracanal laser irradiation.

    Palavras-Chave: dentistry; lasers; erbium; therapeutic uses; teeth

  • IPEN-DOC 28116

    ANTUNES, A. ; ROSSI, W. de ; SALVADOR, V. ; ZEZELL, D.M. . Relationship between mineral composition and hardness of the human dental treated with short pulsed Nd:YAG laser in caries prevention. In: CONGRESS OF THE EUROPEAN SOCIETY FOR ORAL LASER APPLICATIONS, 1st; CONGRESS OF THE GERMAN SOCIETY FOR LASER DENTISTRY, 10th, May 17-20, 2001, Vienna, Austria. Abstract... Vienna, Austria: European Society for Oral Laser Applications, 2001. p. 45-45.

    Abstract: Various laser systems have been used in treatment of hard tissue with efficiency and safety. The action of the Nd:YAG laser in caries prevention has been reported for many research groups. Caries is a bacterial disease that affects a significant part of world population, causes minerals reduction and may lead to a total loss of the dental tissue. The aim of this study was to evaluate the use of short pulses Nd:YAG laser in caries prevention. The dependency between physico-chemical parameters like hardness and the mineral composition of dental enamel is outlined. Thirty human enamel samples were divided into two groups. The laser used emits radiation wavelength of 1.064 nm, energy of 73 mJ per pulse and 10 ns of pulse width. X-Ray Fluorescence, SEM and Vickers microhardness techniques were used. Obtained results are consistent with other studies and indicated greater Ca/P ratio in lased groups in comparison to the unlased group. The present study suggests that the use of the Q-Switched- d:YAG laser in enamel surfaces contributes to increase the hardness and decrease the mineral loss by bacterial acid attack.

    Palavras-Chave: dentistry; neodymium lasers; therapeutic uses; teeth; bacterial diseases; radiation effects; caries

  • IPEN-DOC 28115

    CRUZ, A.N.L. da; GARONE NETTO, N.; PAGLIARI, A.F.; MATSON, J.; NAVARRO, R.S.; ZEZELL, D.M. ; EDUARDO, C.P.. Microleakage in CO2 laser etching class V composite restoration. In: INTERNATIONAL CONGRESS ON LASERS IN DENTISTRY, 7th, July 30 - August 2, 2000, Brussels, Belgium. Abstract... Aachen, Alemanha: International Society for Laser in Dentistry, 2000. p. 28-28.

    Abstract: The CO2 laser (10.6 μm) can be indicated for dental hard tissues applications if it shows ability to remove the smear layer and creates irregular surfaces able to promote micromechanical retention for adhesive restorative dental materials. The purpose of this study was to evaluate in vitro the effect of CO2 laser etching on cavosurface of cavity preparations to composite resin restorations performed conventionally. Forty Class V cavities were performed with high-speed drill in 20 extracted human molar and randomly divided into 4 different groups: Group 1- CO2 laser (3W, 2Hz, 50ms) and after 37% phosphoric acid etching on enamel and dentin surface; Group 2- 37% phosphoric acid etching and after CO2 laser; Group 3- CO2 laser; Group 4- 37% phosphoric acid etching. The cavity restored with adhesive system (OptiBond Solo-Kerr) and composite resin (Prodigy-Kerr) and thermally stressed (700 cycles, 5º -55º C). The samples were then impermeabilized, immersed in 50% silver nitrate solution for 8 hours and sectioned with Isomet saw. The teeth were exposed to Photoflood light (G.E.) for 5 minutes to reveal the dye. Leakage was observed under stereomicroscope and evaluated with scores. Results were analyzed with ANOVA (p>1%) and Tukey's test (p=5%) and showed that group 2, 3 and 4 had similar results and statistically lower than group 1. These results suggested that CO2 laser may be useful for dental etching, under irradiation parameters used in this study. Further studies are required to verify efficient and safety irradiation conditions and test other restorative materials.

    Palavras-Chave: dentistry; carbon dioxide lasers; leaks; resins; biological recovery; in vitro

  • IPEN-DOC 28114

    FREITAS, LUCAS F. de . Mitochondrial effects of low-level light. In: RAI, VIKRANT (Ed.). Laser Therapies: Types, Uses and Safety. New York, NY, USA: Nova Science Publishers, 2020. p. 95-118, cap. 3.

    Abstract: Since the discovery of light amplified by stimulated emission of radiation – Lasers – in 1967, the effects of light on the improvement of tissue healing, promoting pain relief, decreasing inflammation and swelling, as well as preventing further tissue damage, have been known and constantly studied. Due to these useful properties for health, the interest of researchers for photobiomodulation has been growing, especially with the advent of light-emitting diodes and other light sources with various wavelengths. There are many known effects of light at the molecular level, and most of them occur in the mitochondria (especially by the interaction of light with cytochrome-C oxidase), such as increased ATP production, differential gene expression due to the induction of transcription factors, and altered oxidative status due to the modulation of oxidative stress. This chapter provides up-to-date information regarding those molecular and cellular mechanisms of low-level light according to wavelength, light dose, and other parameters, as well as some of its consequences in the cellular and tissue levels. The concept of the Arndt-Schulz curve, regarding the biphasic dose response to low-level light, is also explained.

    Palavras-Chave: light sources; visible radiation; animal tissues; low dose irradiation; therapy; electromagnetic radiation; biological repair

  • IPEN-DOC 28113

    ARAUJO, ELAINE B. de . Radiofármacos. In: MATTA, VLADI O.C. de (Ed.); BATISTUZZO, JOSE A. de O. (Ed.). Helou, Cimino e Daffre: Farmacotécnica. 2 ed.. Rio de Janeiro, RJ: Atheneu, 2021. p. 319-338, cap. 21.

    Palavras-Chave: radiopharmaceuticals; ionizing radiations; nuclear medicine; radioisotopes; therapy; diagnostic techniques

  • IPEN-DOC 28112

    TABACOW, FABIO B.D. ; ZUFFI, ARMANDO V.F. ; MALDONADO, EDISON P.; SAMAD, RICARDO E. ; VIEIRA JUNIOR, NILSON D. . Theoretical and experimental study of supersonic gas jet targets for laser wakefield acceleration. In: SBFOTON INTERNATIONAL OPTICS AND PHOTONICS CONFERENCE, May 31 - June 2, 2021, Online. Proceedings... Piscataway, NJ, USA: IEEE, 2021. DOI: 10.1109/SBFOTONIOPC50774.2021.9461936

    Abstract: This work reports a theoretical and experimental study of supersonic gas jets to be used as targets in laser wakefield acceleration. A comparison between theoretical and experimental results ismade in order to estimate the results of a de Laval nozzle manufactured in our laboratory, used to produce a N2 gas target. The comparison between the results shows that Computational Fluid Dynamicssimulations are able todescribe the phenomena of the supersonic gas jet.

    Palavras-Chave: interferometry; acceleration; wakefield accelerators; computer calculations; fluid mechanics; nozzles; supersonic flow

  • IPEN-DOC 28111

    CARDOSO, ELBIS S.; SAMAD, RICARDO E. ; MOTTA, CLAUDIO C.. Refractive index change analysis in a high-power Yb-doped double-clad fiber laser. In: SBFOTON INTERNATIONAL OPTICS AND PHOTONICS CONFERENCE, May 31 - June 2, 2021, Online. Proceedings... Piscataway, NJ, USA: IEEE, 2021. DOI: 10.1109/SBFOTONIOPC50774.2021.9461981

    Abstract: An analytical investigation of the refractive index behavior of an ytterbium-doped optical fiber silica glass as a function of the core-clad temperature, upper-level population laser density, and pumping signal intensity is presented in this paper. For the substantiation of the investigation, three fundamental expressions were used, which describe the changes in the refractive index due to these physical phenomena in the laser medium. The model was evaluated considering a 500 W steady state fiber laser, operating in a two-end pumped configuration.

    Palavras-Chave: ytterbium; doped materials; optical fibers; refractive index

  • IPEN-DOC 28110

    PRADO, FELIPE M. ; WETTER, NIKLAUS U. . Record optical efficiency for a diode-side-pumped Nd:YLiF4 laser operating at 1053 nm. In: SBFOTON INTERNATIONAL OPTICS AND PHOTONICS CONFERENCE, May 31 - June 2, 2021, Online. Proceedings... Piscataway, NJ, USA: IEEE, 2021. DOI: 10.1109/SBFOTONIOPC50774.2021.9461863

    Abstract: Here we compare the efficiency and beam parameters of different single-bounce Nd:YLF4 resonators. A total of five cavities were made by changing both, the curved mirror and the output coupler of the resonator. The best configuration resulted in a cavity that generated a record optical-to-optical efficiency of 63.3% and 66.4% of slope efficiency, with a peak output power of 64.5 W for a pumping power of 101.8 W at 797 nm.

    Palavras-Chave: solid state lasers; neodymium lasers; diode-pumped solid state lasers; cavity resonators; vanadates

  • IPEN-DOC 28109

    MAGALHAES, EVELLYN S.; WETTER, NIKLAUS U. ; KASSAB, LUCIANA R.P.; BORDON, CAMILA D. da S.; ROSSI, WAGNER de . New double line architecture produced by fs laser irradiation in Nd3+ doped TeO2-ZnO glass for photonic applications. In: SBFOTON INTERNATIONAL OPTICS AND PHOTONICS CONFERENCE, May 31 - June 2, 2021, Online. Proceedings... Piscataway, NJ, USA: IEEE, 2021. DOI: 10.1109/SBFOTONIOPC50774.2021.9461861

    Abstract: We report the fabrication and passive characterization of Nd 3+ doped TeO 2 -ZnO glass with a new configuration of double waveguides, written with fs laser operating at 800 nm, delivering 30 fs pulses at 10kHz repetition rate. The two written lines that form the double waveguide are formed by several overlapping lines. Results of output mode profile, beam quality factor M 2 and refractive index change are presented as well as the parameters used for laser writing. Writing speed of 0.5 mm/s and pulse energy of 15 μJ demonstrated to be adequate parameters for writing. Refractive index changes of Δn = 1×10 -5 and Δn = 1×10-4 were found at 632 nm for double waveguides written with 4 and 8 overlapping lines, respectively. The mode image results at the output of the waveguides showed a confined beam in agreement with multi transverse order mode. Beam quality factor results were the following: M y = 24±3 and M x = 14±3 at 632 nm. The glasses are produced with the melt quenching technique and the preliminary results demonstrated that they are promising materials for the fabrication of passive and active components for photonic applications.

    Palavras-Chave: doped materials; lasers; glass; photon beams; waveguides; optical properties

  • IPEN-DOC 28108

    NACARATTI, DAVI P.; SAMAD, RICARDO E. ; MOTTA, CLAUDIO C.. Modeling of fiber Bragg gratings with different lengths for the reflectivity control for fiber lasers. In: SBFOTON INTERNATIONAL OPTICS AND PHOTONICS CONFERENCE, May 31 - June 2, 2021, Online. Proceedings... Piscataway, NJ, USA: IEEE, 2021. DOI: 10.1109/SBFOTONIOPC50774.2021.9461968

    Abstract: An analytical formulation and modeling of an optical fiber Bragg gratings has been developed and is reported in this paper. Supported by the coupled-mode theory and considering that the mode fields of the unperturbed waveguide remain unchanged in the presence of weak perturbations, it is possible to obtain first-order differential equations that have solutions for some types of periodic perturbations. Finally, the model is applied to analyze the influence of structural parameters of fiber gratings, such as length, period and refractive index modulation on its reflectivity and bandwidth.

    Palavras-Chave: bragg reflection; optical fibers; fiber optics; gratings; transfer matrix method

  • IPEN-DOC 28107

    DEL VALLE, MATHEUS ; STANCARI, KLEBER ; CASTRO, PEDRO A.A. de ; SANTOS, MOISES O. dos ; ZEZELL, DENISE M. . Machine Learning methods for micro-FTIR imaging classification of human skin tumors. In: SBFOTON INTERNATIONAL OPTICS AND PHOTONICS CONFERENCE, May 31 - June 2, 2021, Online. Proceedings... Piscataway, NJ, USA: IEEE, 2021. DOI: 10.1109/SBFotonIOPC50774.2021.9461969

    Abstract: This review presents some methods applied to micro-FTIR imaging for classification of human skin tumors. It is a collection of the pre-processing pipeline and machine learning classification models. The aim of this review is to update and summaiize the current methods which an applied in our skin tumor research.

    Palavras-Chave: skin diseases; tumor cells; infrared radiation; fourier transformation; machine learning; spectra

  • IPEN-DOC 28106

    VIEIRA JUNIOR, NILSON D. ; MALDONADO, EDISON P.; BONATTO, ALEXANDRE; NUNES, ROGER P.; BANERJEE, SUDEEP; GENEZINI, FREDERICO A. ; MORALLES, MAURICIO ; ZUFFI, ARMANDO V.F. ; SAMAD, RICARDO E. . Laser wakefield electron accelerator: possible use for radioisotope production. In: SBFOTON INTERNATIONAL OPTICS AND PHOTONICS CONFERENCE, May 31 - June 2, 2021, Online. Proceedings... Piscataway, NJ, USA: IEEE, 2021. DOI: 10.1109/SBFOTONIOPC50774.2021.9461976

    Abstract: Electron beams generated by laser wakefield acceleration can induce a photoneutron reaction to convert 100Mo into 99Mo. Multi-pC, several-MeV electron beams, obtained from particle-in-cell simulations, could generate bremsstrahlung gamma photons within the absorption region of the photonuclear reaction. The efficiency of this process is estimated for a laser accelerator operating at kHz repetition rate in the self-modulated regime. The electron beam kinetic energy must be improved to 40MeV. To meet the typical consumption of 99Mo per patient within its decay timescale, this efficiency must be increased by three orders of magnitude.

    Palavras-Chave: nuclear medicine; radioisotopes; wakefield accelerators; diagnostic techniques; electron beams; photoneutrons

  • IPEN-DOC 28105

    SAMAD, RICARDO E. ; MALDONADO, EDISON P.; ROSSI, WAGNER de ; VIEIRA JUNIOR, NILSON D. . High intensity ultrashort laser pulses and their applications at IPEN. In: SBFOTON INTERNATIONAL OPTICS AND PHOTONICS CONFERENCE, May 31 - June 2, 2021, Online. Proceedings... Piscataway, NJ, USA: IEEE, 2021. DOI: 10.1109/SBFOTONIOPC50774.2021.9461930

    Abstract: Ultrashort laser pulses interact with matter in unique, nonselective ways, due to electronic direct excitation in an ultrafast time scale. Additionally, these pulses can cover peak powers from kW to PW, allowing its use to induce from nonlinear optics up to relativistic phenomena. Here we present a quick overview of the important processes induced in matter by high-intensity ultrashort pulses, and describe results obtained in our laboratory, including our most recent goal of accelerating electrons with ultrashort pulses for practical applications.

  • IPEN-DOC 28104

    CASTRO, PEDRO ; ZORN, TELMA; ZEZELL, DENISE . Healing status of bum wound healing: ATR-FTIR study. In: SBFOTON INTERNATIONAL OPTICS AND PHOTONICS CONFERENCE, May 31 - June 2, 2021, Online. Proceedings... Piscataway, NJ, USA: IEEE, 2021. DOI: 10.1109/SBFotonIOPC50774.2021.9461956

    Abstract: The purpose of this study is to use infrared spectroscopy (FTIR) for monitoring biological changes in burned skin. Wistar rats dorsum samples were compared to healthy group samples at 7, 14, 21 days after burn. Proteins changes of burn wounds were monitored by area under the curve (AUC) of bands at 1630 cm 1 , 1543 cm 1 and 1743 cm 1 . Kruskal-Wallis normality tests, unpaired t test with Welch's correction were used to evaluate the differences between AUC. These bands suggest association between collagen activity during wound healing stages. Our result indicates progressive recovery of 7,14 and 21 days tissues when compared with the healthy group.

  • IPEN-DOC 28103

    JUVINO, AMANDA C. ; ROMANO, MARIANA; ALVES, NATHALIA Z. ; FREITAS, THAIS R. ; ZAMATARO, CLAUDIA B. ; ZEZELL, DENISE M. . Evaluation of the anti-caries effect beyond the critical enamel pH of preventive treatment of fluoride associated with Nd:YAG laser irradiation. In: SBFOTON INTERNATIONAL OPTICS AND PHOTONICS CONFERENCE, May 31 - June 2, 2021, Online. Proceedings... Piscataway, NJ, USA: IEEE, 2021. DOI: 10.1109/SBFotonIOPC50774.2021.9461860

    Abstract: This study aimed to evaluate the anti-caries effect of fluoride associated with Nd:YAG laser irradiation in the h-eatment of enamel Eight groups (n = S) were analyzed: Negative Control pH 4.5; Negative control pH 4; Fluoride pH 4.5; Fluoride pH 4; Nd-YAG pH 4.5; Nd-YAG pH 4; (Fluoride + Nd-YAG) pH 4.5 and (Fluoride + Nd-YAG) pH 4. All samples were analyzed by Scanning Electron Microscopy (SEM) before and after the cycle. Quantification of phosphorus in the cycling solutions was carried out using the colorimetric method, as an indication of enamel demineralization. The anti-caries effect of the Fluoride + Nd: YAG treatment in addition to the critical pH of the enamel can be observed in the morphological analysis, however in the analysis of the demineralization solutions, the amount of phosphorus showed a difference only in the Fluoiide group compared to the others in the investigative pH.

  • IPEN-DOC 28102

    VALLE, MATHEUS del ; SANTOS, MOISES O. dos ; SANTOS, SOFIA N. dos ; BERNARDES, EMERSON S. ; ZEZELL, DENISE M. . Evaluation of machine learning models for the classification of breast cancer hormone receptors using micro-FTIR images. In: SBFOTON INTERNATIONAL OPTICS AND PHOTONICS CONFERENCE, May 31 - June 2, 2021, Online. Proceedings... Piscataway, NJ, USA: IEEE, 2021. DOI: 10.1109/SBFOTONIOPC50774.2021.9461946

    Abstract: The breast cancer is the most incident cancer in women. Evaluation of hormone receptors expression plays an important role to outline treatment strategies. FTIR spectroscopy imaging may be employed as an additional technique, providing extra information to help physicians. In this work, estrogen and progesterone receptors expression were evaluated using tumors biopsies from human cell lines inoculated in mice. FTIR images were collect from histological sections, and six machine learning models were applied and assessed. Xtreme gradient boost and Linear Discriminant Analysis presented the best accuracies results, indicating to be potential models for breast cancer classification tasks.

  • IPEN-DOC 28101

    MALDONADO, EDISON P.; SAMAD, RICARDO E. ; BONATTO, ALEXANDRE; NUNES, ROGER P.; BANERJEE, SUDEEP; VIEIRA JUNIOR, NILSON D. . Electron beam properties in self-modulated laser wakefield acceleration using TW and sub-TW pulses. In: SBFOTON INTERNATIONAL OPTICS AND PHOTONICS CONFERENCE, May 31 - June 2, 2021, Online. Proceedings... Piscataway, NJ, USA: IEEE, 2021. DOI: 10.1109/SBFOTONIOPC50774.2021.9461971

    Abstract: We review the fundamentals of electron beam generation in self-modulated laser wakefield acceleration (SM-LWFA) using laser pulses with peak powers on the TW and sub-TW scale. The results of several new particle-in-cell simulations for λ = 0.8 μm and a thin H2 gas target are shown. By scanning the peak gas density and peak power values of the incident laser, we discuss the resulting acceleration processes, as well as the characteristics of the electron beams generated for different conditions. Our approach provides a method to optimize these beams with lasers operating at kHz repetition rates.

  • IPEN-DOC 28100

    CHIOMENTO, BRUNO B. ; ZUFFI, ARMANDO V.F. ; VIEIRA JUNIOR, NILSON D. ; TABACOW, FABIO B.D. ; MALDONADO, EDISON P.; SAMAD, RICARDO E. . Development of dielectric de Laval nozzles for laser electron acceleration by ultrashort pulses micromachining. In: SBFOTON INTERNATIONAL OPTICS AND PHOTONICS CONFERENCE, May 31 - June 2, 2021, Online. Proceedings... Piscataway, NJ, USA: IEEE, 2021. DOI: 10.1109/SBFOTONIOPC50774.2021.9461928

    Abstract: This work reports the development and experimental implementation of a methodology for manufacturing submillimetric de Laval nozzles by ultrashort laser pulses micromachining by trepanning. The use of a ceramic substrate resulted in the fabrication of nozzles with high circularity and low roughness, which should generate high-quality gas targets for accelerating electrons with ultrashort laser pulses.

  • IPEN-DOC 28099

    ZUFFI, ARMANDO V.F. ; MALDONADO, EDISON P.; VIEIRA JUNIOR, NILSON D. ; SAMAD, RICARDO E. . Development of a modified Mach–Zehnder interferometer for time and space density measurements for laser wakefield acceleration. In: SBFOTON INTERNATIONAL OPTICS AND PHOTONICS CONFERENCE, May 31 - June 2, 2021, Online. Proceedings... Piscataway, NJ, USA: IEEE, 2021. DOI: 10.1109/SBFOTONIOPC50774.2021.9461961

    Abstract: This work reports the development of a modified Mach–Zehnder interferometer aimed at determining the density of gas targets and laser generated plasmas, in time and space. This interferometer will compose our laboratory implementations for laser wakefield acceleration, allowing the characterizations of gas jet profiles generated by submillimeter nozzles. The technique also allows us to estimate the temporal evolution of the plasma density.

  • IPEN-DOC 28098

    RODRIGUES, FABRIZIO M.; SILVA, LARISSA S.N. da; ZEZELL, DENISE M. ; ANA, PATRICIA A.. Compositional changes promoted by Er,Cr:YSGG laser when used to inhibit dentin erosion. In: SBFOTON INTERNATIONAL OPTICS AND PHOTONICS CONFERENCE, May 31 - June 2, 2021, Online. Proceedings... Piscataway, NJ, USA: IEEE, 2021. DOI: 10.1109/SBFOTONIOPC50774.2021.9461943

    Abstract: Lasers are used for preventing demineralization, but there are no studies that report the compositional changes on root dentin irradiated with Er,Cr:YSGG (2.78μm) laser in an erosive process. In this in vitro study, fifty dentin slabs were distributed in 5 groups to be treated with Er,Cr:YSGG laser associated or not with application of acidulated phosphate fluoride gel (APF-gel); then, a 10-days erosion regimen was conducted and the composition changes were monitored by Fourier transform infrared spectroscopy. The data suggest a synergistic effect between laser irradiation and APF-gel, with a greater preventive effect when APF-gel was applied after irradiation.

  • IPEN-DOC 28097

    MELO, PEDRO B. dos S.; SAMAD, RICARDO E. ; MOTTA, CLAUDIO C.. Analytical formulation of an Yb-doped tandem-pumping fiber amplifier. In: SBFOTON INTERNATIONAL OPTICS AND PHOTONICS CONFERENCE, May 31 - June 2, 2021, Online. Proceedings... Piscataway, NJ, USA: IEEE, 2021. DOI: 10.1109/SBFOTONIOPC50774.2021.9461980

    Abstract: An analytical formulation of a multi-kilowatt ytterbium-doped double-cladding tandem-pumped fiber amplifier was developed and is reported in this paper. The model consists of a system including the laser rate, pumping and seed power equations. The model was validated by describing a fiber amplifier behavior with a 5.986kW, 1018nm pumping and a signal seed of 75W, 1080nm, yielding a maximum power output of 5.448kW, with an efficiency of 91.1%. The thermal equations are solved for the temperature distribution along the fiber with a maximum temperature of 43.24°C, when the convective coefficient of 4000W. m-2. K -1 is used.

  • IPEN-DOC 28096

    POLO, IVON O. ; JUNOT, DANILO O. ; CALDAS, LINDA V.E. . TL response of CaSO4:Eu,Ag detectors in 90Sr/90Y beta radiation beam. In: WORKSHOP ON NUCLEAR PHYSICS, 17th, April 1-5, 2019, Havana, Cuba. Proceedings... 2019.

    Abstract: The results of the TL response of the CaSO4:Eu,Ag detectors in the 90Sr/90Y beams of the BSS2 system of the LCI/ IPEN are presented. The TL glow curves were obtained from doses between 30 mGy and 500 mGy. The detectors showed a good reproducibility of the TL response. The calculated calibration factor was (1.166 ± 0.024) x10-3 mGy/a.u. and the factor determined by linear fitting was (1.120 ± 0.014) x10-3 mGy/a.u., showing a difference of only 3.9%. The lower limit of detection was (4.96 ± 0.06) mGy. The detectors indicated the appropriate sensitivity for 90Sr/90Y beta radiation. Preliminary results show suitable dosimetric characteristics for the establishment of a transfer system for beta dosimetry of 90Sr/90Y beams.

  • IPEN-DOC 28095

    VIEIRA, ANA C.D.; KODAMA, YASKO ; OTUBO, LARISSA ; SANTOS, PAULO S. ; VASQUEZ, PABLO A.S. ; GARCIA, RAFAEL H.L. . Application of gamma irradiation to conservation: effects of ionizing radiation on the color of featherwork. In: ICOM-CC TRIENNIAL CONFERENCE, 19th, May 17-21, 2021, Beijing, China. Abstract... Paris, France: International Council of Museums, 2021.

    Abstract: Featherwork is one of the most remarkable categories of material culture produced by Brazilian indigenous peoples due to its technical qualities and aesthetic beauty. Weapons, baskets, and musical instruments are frequently decorated with feathers, which are also used in body adornments that, in addition to their aesthetic purpose, are intended to convey information about the wearer, their position within a group, and the cultural values that they wish to transmit. The preservation of this type of artifacts is demanding given the biological cycle of the organic materials that compose them, which are inevitably subject to various stages of deterioration. In addition to the damage resulting from their use and perishable materials, these ethnographic objects are exposed to a new environment when they are incorporated into museum collections, where their existence must be prolonged. Since Brazil’s tropical climate often leads to pest proliferation, their degradation can be exacerbated by the action of insects such as moths and microorganisms such as fungi with irreversible consequences, making their conservation a daily challenge. Although the art of featherwork is still practiced by indigenous communities, the scarce supply of raw materials and contact with the tribes involved has reduced the scale of production. The preservation of this material heritage is thus very important, particularly in ethnographic museums. The use of gamma radiation for the disinfestation of cultural heritage artifacts and archived materials has been shown to be a safe process and an excellent alternative to traditional methods, which usually involve toxic chemical pesticides. Ionizing radiation has been used for more than 40 years and, since 2004, the Multipurpose Irradiator at the Institute of Energy and Nuclear Research (IPEN), a pioneering technology developed in Brazil, has made its application to cultural heritage a reality. With more than 20,000 cultural artifacts irradiated, IPEN is currently the national and international reference center for the use of radiation technology applied to the preservation of cultural heritage collections. Several studies have been conducted to determine the optimal dose required to eliminate contamination by biological agents in organic materials such as wood, leather, and feathers.A maximum dose of 10 kGy is recommended for featherwork in order to avoid affecting the physical and chemical properties of this type of material. This poster reports on the results of the effects of ionizing radiation on the color and morphological properties of a featherwork from the Museum of Archaeology and Ethnology at the University of São Paulo (MAE/USP). Samples of feathers were selected and irradiated with gamma rays at the Multipurpose Gamma Irradiation Facility, applying absorbed doses of between 0.5 and 200 kGy. The samples were chosen according to the color of the feathers and then photographed and analyzed using colorimetry based on the CIELAB 1976 color space scale before and 48 hours after irradiation and scanning electron microscopy. There were no significant changes in morphological and color properties within the disinfestation range applied.

  • IPEN-DOC 28094

    MOREIRA, G.A. ; LOPES, F.J.S. ; CODATO, G.; SANCHEZ, M.P.; SILVA, J.J. da ; GOMES, A.A. ; TITO, J.V.; SILVA, L.A.H.; SILVEIRA, L.C.; LANDULFO, E. ; OLIVEIRA, A.P.. Analyzing the effects of biomass in the Amazon region on the São Paulo urban boundary layer. In: EUROPEAN LIDAR CONFERENCE, November 18-20, 2020, Granada, Spain. Resumo expandido... 2020. p. 1-2.

  • IPEN-DOC 28093

    YOSHIDA, A.C. ; LOPES, F.J.S. ; CACHEFFO, A. ; MOREIRA, G.A. ; SILVA, J.J. da ; LANDULFO, E. . AEOLUS calibration and validation activities at SPU Lidar Station - Brazil. In: EUROPEAN LIDAR CONFERENCE, November 18-20, 2020, Granada, Spain. Resumo expandido... 2020. p. 1-2.

  • IPEN-DOC 28092

    CAPPUZZELLO, F.; AGODI, C.; ACOSTA, L.; ALTANA, C.; AMADOR-VALENZUELA, P.; AUERBACH, N.; BAREA, J.; BELLONE, J.; BIJKER, R.; BONANNO, D.; BORELLO-LEWIN, T.; BOZTOSUN, I.; BRANCHINA, V.; BRASOLIN, S.; BRISCHETTO, G.; BRUNASSO, O.; BURRELLO, S.; CALABRESE, S.; CALABRETTA, L.; CALVO, D.; CAPIROSSI, V.; CARBONE, D.; CAVALLARO, M.; CHARON GARCIA, L.E.; CHAVEZ LOMELI, E.R.; CHEN, R.; CIRALDO, I.; COLONNA, M.; D’AGOSTINO, G.; DELAUNAY, F.; DESHMUKH, N.; DJAPO, H.; DE GERONIMO, G.; DE LOS RIOS, K.; FERRARESI, C.; FERREIRA, J.L.; FERRETTI, J.; FINOCCHIARO, P.; FIRAT, S.; FISICHELLA, M.; FOTI, A.; GALLO, G.; GARCIA-TECOCOATZI, H.; HACISALIHOGLU, A.; HUERTA-HERNANDEZ, A.; KOTILA, Z.J.; KUCUK, Y.; IAZZI, F.; LANZALONE, G.; LAY, J.A.; LA FAUCI, L.; LA VIA, F.; LENSKE, H.; LINARES, R.; LO PRESTI, D.; LUBIAN, J.; MA, J.; MARIN-LAMBARRI, D.; MAS RUIZ, J.; MEDINA, N.H.; MENDES, D.R.; MEREU, P.; MORALLES, M. ; NERI, L.; OLIVEIRA, J.R.B.; PAKOU, A.; PANDOLA, L.; PETRASCU, H.; PIETRALLA, N.; PINNA, F.; REITO, S.; RIES, P.; RODRIGUES, M.R.D.; RUSSO, A.D.; RUSSO, G.; SANTOPINTO, E.; SANTOS, R.B.B.; SERBINA, L.; SGOUROS, O.; SILVEIRA, M.A.G. da; SOLAKCI, S.O.; SOULIOTIS, G.; SOUKERAS, V.; SPATAFORA, A.; TORRESI, D.; TUDISCO, S.; VARGAS HERNANDEZ, H.; VSEVOLODOVNA, R.I.M.; WANG, J.S.; WERNER, V.; YANG, Y.Y.; YILDIRIN, A.; ZAGATTO, V.A.B.. The NUMEN project @ LNS: status and perspectives. In: CIVITARESE, OSVALDO (Ed.); STEKL, IVAN (Ed.); SUHONEN, JOUNI (Ed.) WORKSHOP ON CALCULATION OF DOUBLE-BETA-DECAY MATRIX ELEMENTS, May 27-31, 2019, Prague, Czech Republic. Proceedings... Melville, NY, USA: AIP Publishing, 2019. p. 020003-1 - 020003-6. (AIP Conference Proceedings, 2165). DOI: 10.1063/1.5130964

    Abstract: The NUMEN project aims at accessing experimentally driven information on Nuclear Matrix Elements (NME) involved in the half-life of the neutrinoless double beta decay (0νββ), by high-accuracy measurements of Heavy Ion (HI) induced Double Charge Exchange (DCE) reaction cross sections. In particular, the (18O,18Ne) and (20Ne,20O) reactions are used as tools for β+β+ and β-β- decays, respectively. In the experiments, performed at INFN - Laboratory Nazionali del Sud (LNS) in Catania, the beams are accelerated by the Superconducting Cyclotron (CS) and the reaction ejectiles are detected the MAGNEX magnetic spectrometer. The measured cross sections are challengingly low (a few nb), being the total reaction cross section much larger (a few b), thus a high sensitivity and a large rejection capability are demanded to the experimental set-up. This limits the present exploration to few selected isotopes of interest in the context of typically low-yield experimental runs. A major upgrade of the LNS facility is foreseen in order to increase the experimental yield of at least two orders of magnitude, still keeping the high sensitivity of the present set-up, making it feasible a systematic study of all the cases of interest. Frontiers technologies are going to be developed, to this purpose, for the accelerator and the detection systems. In parallel, advanced theoretical models are being developed in order to extract the nuclear structure information from the measured cross sections.

  • IPEN-DOC 28091

    STEFANI, GIOVANNI L. de ; MAIORINO, JOSE R. . The AP-Th 1000 an advanced concept to use MOX of thorium in a closed fuel cycle. In: INTERNATIONAL CONFERENCE ON EMERGING NUCLEAR ENERGY SYSTEMS, 19th, October 6-9, 2019, Bali, Indonesia. Proceedings... 2019.

    Abstract: This work presents a study for the firsts 4 cycles of recharge of the reactor AP-Th1000, a version of the reactor AP1000 using mixed uranium and thorium oxides as fuel, which the feasibility studies had been already demonstrated in previous study for a first cycle. The AP-Th 1000 study is a proposal to start the thorium fuel cycle using the most common reactor technology in the nuclear industry, the Pressurized Water Reactors (PWR). A preliminary closed cycle study is carried out for the first 4 cycles where the production of 233U are evaluated. In cycles 2, 3 and 4, new assemblies with a fuel of the remaining uranium from the previous cycle are used instead of assemblies removed from the core, thus being a mixture of different uranium’s (232U, 233U, 234U, 235U, 236U and 238U) , where the additional fissile material inserted into the fuel to ensure the 18-month operation of the reactor comes from uranium oxides enriched at 20 w / o.. The results demonstrate the viability of the proposal and again using closed fuel cycle.

  • IPEN-DOC 28090

    FRANCO, JOSE F. da S. ; MARQUES, ROBERTA M.; PROVEDA, NATHALIE P.. Relato de caso da Síndrome de Scheie: necessidade da terapia enzimática?. In: CONGRESSO BRASILEIRO DE GENÉTICA MÉDICA, 31., 1-5 de julho, 2019, Salvador, BA. Resumo... Porto Alegre, RS: Sociedade Brasileira de Genética Médica e Genômica, 2019.

    Abstract: Introdução: A síndrome de Scheie (SS) é uma doença de depósito lisossomal e de padrão autossômico recessivo. Decorre da deficiência da enzima alfa-L-iduronidase e leva ao acúmulo multissistêmico de glicosaminoglicanos (GAGs). O diagnóstico se baseia principalmente na dosagem da atividade enzimática da alfa-L-iduronidase em leucócitos. Terapia de reposição enzimática (TRE) pode ser uma alternativa para pacientes com complicação da doença de base. Relato de Caso: Paciente, sexo feminino, 44 anos, diagnóstico SS aos 17 anos de idade por apresentar deficiência alfa-L-iduronidase (0,5 nm/h/mg prot), mutação homozigótica W402X e fenótipo que incluía baixa estatura, face infiltrada, mãos em garra, disostose multiplex, hepatomegalia, retinose pigmentar, hérnia umbilical. Evoluiu com dilatação de câmaras e insuficiência cardíaca com fração de ejeção (FE)=26. TRE iniciou em 2002 e a paciente decidiu interromper em 2017 devido às graves reações de hipersensibilidade. Níveis de GAGs urinários: 70ug/mg (VR 13-45, antes), 204ug/mg (13-45, na interrupção) e 129ug/mg (13-45, após 1 ano). Atualmente sem queixas aos esforços, estável hemodinâmica, fígado a 4 cm do rebordo costal, em uso de carvedilol, enalapril e diurético de alça, FE 51 e perda de peso 6Kg. Discussão: A falta de aderência ao tratamento enzimático pelas reações à infusão contribuíram para o abandono terapêutico do paciente. O teste de qualidade de vida foi necessário após relatos bem-estar físico e emocional referido pelo doente. Não houve piora clínica após interrupção da TRE, como esperado pela literatura. Até o momento, não houve queixas ou internações. A cardiopatia do paciente responde a medicamentos mas não respondeu a TRE e parece não haver benefício esperado em relação ao coração. Os GAGs urinários aumentados até o presente momento, não tiveram correlação com a estabilidade clínica do quadro. Conclusão: A indicação da TRE na SS deve ser criteriosa e seus benefícios a longo prazo podem não superar seus efeitos adversos.

  • IPEN-DOC 28089

    FRANCO, JOSE F.S. ; AMENDOLA, RAFAEL de M.. Ectrodactilia pode fazer parte da Síndrome de Silver Russel (SSR)?. In: CONGRESSO BRASILEIRO DE GENÉTICA MÉDICA, 30.; CONGRESSO BRASILEIRO DA SBTEIM, 7.; CONGRESSO BRASILEIRO DE ENFERMAGEM EM GENÉTICA E GENÔMICA, 4., 15-18 de maio, 2018, Rio de Janeiro, RJ. Resumo... Porto Alegre, RS: Sociedade Brasileira de Genética Médica e Genômica, 2018. p. 153-154.

    Abstract: Introdução: A SSR é uma síndrome genética caracterizada por assimetria do corpo, face triangular restrição no crescimento intrauterino (RCIU), baixo peso e comprimento pós natal dentre outras características. Há heterogeneidade da condição e o imprinting genômico, relacionado à diferença de expressão gênica de alelos maternos e paternos foi apontado também como um dos mecanismos etiológicos da SSR que envolvem genes localizados na região 7p11.2-p13 e 7q31-qter 15-17. A Ectrodactilia também conhecida por SHFM apresenta ausência congênita dos raios centrais, formados pelo segundo, terceiro e quarto raios, gerando uma grande fenda mediana na mão ou pés, associada à aplasia/hipoplasia de metacarpos ou metatarsos e/ou falanges. Algumas vezes pode ser causa de mutações em SHFM1 em 7q21-q22, SHFM2 (Xq26), SHFM3 (FBXW4/DACTYLIN em 10q24), TP63, entre outros . Nesse relato, apresentamos um paciente que possui SSR com ectrodactilia, ainda não descrita na literatura. Descrição do caso: RTC, filho de pais não consanguíneos, sem história familiar para ectrodactilia, RCIU, sexo masculino, 6 meses de vida, internado na UTI pediátrica por um quadro de sepse. Ao exame apresentou microssomia e assimetria corporal (DE), face triangular, hipertelorismo ocular, desproporção crânio-corpo, ectrodactilia mãos bilateral e hipospádia. Cariótipo Banda G, pesquisa de microARRAY, dissomia uniparental do cromossomo 7 e exoma não mostraram evidência para diagnóstico para a SSR ou SHFM. Análise por MLPA mostrou hipometilação para ICI (H19) em 11p15, confirmando o diagnóstico. Discussão: Não há relatos na literatura da ectrodactilia associada a alterações fenotípicas clássicas da SSR. Investigação familiar e molecular para SHFM foram negativas. Acompanhamento de crianças com SSR inclui medidas como a administração do hormônio do crescimento, investigação imunológica, planos individualizados de terapia e ensino, abordagens clínicas e cirúrgicas, acompanhamento de múltiplas especialidades além do aconselhamento genético. Conclusão: Devido a condição da SSR e SHFM serem heterogêneas, mais estudos para essa possível associação são necessários.

  • IPEN-DOC 28088

    BRANCO, I.S.L. ; SHORTO, J.M.B. ; SIQUEIRA, P.T.D. ; YORIYAZ, H. . Distinct dose contributions in proton therapy calculated using MCNP6 and TOPAS. In: REUNIÃO DE TRABALHO SOBRE FÍSICA NUCLEAR NO BRASIL, 42.; ENCONTRO NACIONAL DE FÍSICA DE PARTÍCULAS E CAMPOS, 40., 1-5 de setembro, 2019, Campos do Jordão, SP. Resumo... São Paulo, SP: Sociedade Brasileira de Física, 2019.

    Abstract: The trade-off between the delivery of high doses conformed to a tumor volume, and the restriction of the doses received by the surrounding healthy tissues and organs is what characterizes the e±ciency of radiotherapeutic procedures. As a radiotherapy modality, proton therapy stands out in this scenario because it has dosimetric advantages, which, when combined with technological advances, allows a great potential in the dose distribution conformity. By modulating the protons Bragg peak as a function of beam energy and delivery time, the three-dimensional shaped dose distribution generates more pronounced dose gradients, which composes an ideal technique when preserving organs is a priority. In proton therapy, protons account for much of the dose deposition. However, as protons travel through matter, secondary particles are created by interactions, including electrons, neutrons, and gammas. It is believed that the secondary dose, mainly deposited by neutrons, can lead to secondary cancer, especially in pediatric cases. Therefore, the focus of this work is to study the contribution of the different particles in the total dose deposition. Monte Carlo simulations were performed with the MCNP6 code and the TOPAS interface (based on GEANT4) to estimate the dose deposition. A simple water simulator was used and the characteristics of the different beam contributions were investigated. Primary and secondary dose values were tabulated and discussed. By demonstrating the method of these calculations, the objective of this work is to serve as a guide for the study of the different contributions of the dose responsible particles in proton therapy, as well as for understanding how different Monte Carlo codes calculate these contributions.

  • IPEN-DOC 28087

    VARELA, B.A.; TRESINARI, B.; ROSSI, M.G.; PIRES, N.S.; PIRES, M.C.; VASQUEZ, P.A.S. ; JURKIEWICZ, C.. Aplicação do processo de irradiação com raios gama na conservação de fécula de mandioca hidratada. In: CONGRESSO BRASILEIRO DE ENGENHARIA QUÍMICA, 22., 23-26 de setembro, 2018, São Paulo, SP. Anais... São Paulo, SP: Blucher, 2018. p. 2805-2808. DOI: 10.5151/cobeq2018-PT.0742

    Abstract: O processo de irradiação com raios gama pode ser utilizado para aumentar a vida útil dos alimentos através da redução do número de bactérias deteriorantes. Fécula de mandioca hidratada (tapioca) foi irradiada com raios gama provindos do cobalto 60 com doses absorvidas de 5, 9 e 13 kGy e armazenada a 25 °C por 45 dias. Todas as doses avaliadas reduziram as contagens abaixo do nível de detecção dos métodos, no primeiro dia de armazenamento. Apenas a dose de 13 kGy evitou a multiplicação de bolores e leveduras, enquanto os demais microrganismos atingiram contagens de até 10(4) UFC/g. A análise sensorial pelo método triangular, mostrou diferença não significativa entre a amostra irradiada e não irradiada.

  • IPEN-DOC 28086

    ROSSI, A. ; ABBADE, L. ; LARA, J.C.; JESUS, E.R.B.; COLOSIO, M.A.; BARBOSA, L.P. ; MUCSI, C.S. ; ROSSI, J.L. . Caracterização da solda a ponto em chapa de aço 22MNB5, utilizando ensaio de tração e análises de correlação de imagem digital. In: ENCONTRO CIENTÍFICO DE FÍSICA APLICADA,11., 1-4 de dezembro, 2020, Vitória, ES. Resumo... São Paulo, SP: Blucher, 2021. p. 10-12.

    Abstract: A soldagem a ponto é uma ferramenta amplamente usada para unir chapas na indústria automotiva. O aço 22MnB5 foi um dos escolhidos para a utilização na coluna B dos automóveis, pois apresenta a resistência mecânica adequada a suportar os esforços de impactos laterais. Observou-se ser necessário estudar as uniões soldadas destes aços através deste tipo de soldagem, devido às seguintes requisitos: aumento da necessidade da indústria automobilística em reduzir o peso do veículo e aumentando a segurança dos passageiros em atendimento a resolução do Conselho Nacional de Transito – CONTRAN n° 751 sobre o ensaio de colisão lateral, para autorizar a venda de carros no Brasil. A microestrutura deste aço, na condição recozida, é basicamente formada por ferrita e perlita, com limite de resistência à tração em torno de 600 MPa. Após o processo de têmpera (aquecimento do material e posterior resfriamento rápido), este material passa a apresentar uma microestrutura completamente martensítica e resistência à tração próxima a 1500 MPa. Este aço foi projetado para sofrer o resfriamento rápido durante a estampagem a quente, em estampos refrigerados, passando assim a denominar-se, comercialmente, PHS (Press Hardening Steel). Durante a soldagem destes aços, estes sofrem aquecimentos significativos, possibilitando a recristalização e, face a velocidade do processo, da formação de microestruturas típicas da zona afetada pelo calor (ZAC). Este trabalho tem como objetivo investigar a resistência a tração de amostras de aço 22MnB5 submetidas a solda a ponto sob diferentes condições experimentais, com a observação das deformações ocorridas nas amostras durante os ensaios de tração. Os ensaios de tração foram realizados em corpos de prova, com dimensões normalizadas pela Japanese Industrial Standards (JIS). Os ensaios de tração também foram digitalmente filmados e os fotogramas sequenciados foram analisados utilizando-se o método chamado de correlação de imagens digitais. Utilizando-se o método da correlação de imagens digitais, foi possível efetuar a caracterização das deformações bidimensionais das superfícies das amostras durante o ensaio de tração, de chapas de aço 22MnB5, anteriormente preparadas com as soldas a ponto. Para se utilizar o método de correlação de imagem digital, foi necessária a sobreposição, sobre a superfície do corpo de prova, de um conjunto de pontos aleatoriamente distribuídos. Este conjunto de pontos foi obtido pela deposição de gotículas de aerossol de tinta, na superfície dos corpos de prova, processo aqui denominado de pintura da superfície da amostra. Foram produzidos vários espécimes em condições técnicas e com tipos de pinturas da superfície da amostra diferenciadas, utilizando o aço laminado em sua condição recozida, na condição temperada, e realizando-se a pintura atendendo orientações do fabricante do aplicativo e de outros processos de pintura propostos. Os espécimes, foram então, submetidos à deformação até a sua ruptura visando reproduzir parte da real condição de trabalho durante a deformação, verificar os resultados obtidos pelo programa (GOM Correlate) com as diferentes pinturas de superfície, verificar possíveis padrões de deformações elástica, plástica, de trincas e rupturas. Pôde-se observar e analisar as diferenças entre as imagens obtidas pelos diferentes métodos pintura das superfícies das amostras, assim como a formação de padrões de deformação devidos às alterações na microestrutura do aço durante a soldagem. Ainda não foi obtido resultado significativo para se obter imagem do momento da formação de trinca pelo método de correlação de imagem digital utilizado, devido à necessidade de maiores taxas de aquisição de imagens e de testar outros processos de geração de pontos sobre a superfície dos corpos de prova. Concluiu-se que a pintura das superfícies dos corpos de prova exerce papel fundamental na observação das deformações da amostra, através do método da correlação digital de imagens. Assim, deve-se escolher adequadamente o tipo de tinta e o procedimento de pintura. Observou-se que, para extensas deformações, as tintas escolhidas devem oferecer aderência adequada à superfície estudada. Houve um padrão na forma e na região de ruptura dos corpos de prova recozidos e dos temperados.

  • IPEN-DOC 28085

    ROSSI, A. ; ABBADE, L. ; LARA, J.A.C. ; JESUS, E.R.B.; COLOSIO, M.A.; BARBOSA, L.P. ; ROSSI, J.L. ; MUCSI, C.S. . Tensile testing and digital image correlation of 22MnB5 press hardened steel (PHS). In: ENCONTRO CIENTÍFICO DE FÍSICA APLICADA,11., 1-4 de dezembro, 2020, Vitória, ES. Anais... São Paulo, SP: Blucher, 2021. p. 67-74. DOI: 10.5151/xiecfa-Rossi-A_R

    Abstract: Spot welding is a widely used tool for joining sheets parts in the automotive industry. As 22MnB5 steel has the adequate mechanical strength to withstand lateral impact and rollover stresses, it was chosen for the use in B-pillar. It was observed the need to study the spot welded joints, due to the increased need of the automobile industry in reducing the weight vehicle and increasing the passengers' safety in compliance with Resolution of the National Traffic Council of Brazil - CONTRAN n° 751 on the lateral collision test. The microstructure of this steel, in the as fabricated condition, is basically formed by ferrite and perlite, with a tensile strength limit of 600 MPa. This steel is designed to undergo rapid cooling during hot stamping. After this process, this steel presents a completely martensitic microstructure and tensile strength close to 1500 MPa. This work aimed to investigate the strength of spot welded specimens under different experimental conditions, observing the deformations during the tensile tests. The tests were digitally recorded and the sequenced frames were analyzed using a method called digital image correlation (DIC).

  • IPEN-DOC 28084

    ALENCAR, M.A. ; BARBOSA, L.P. ; MUCSI, C.S. ; ROSSI, A. ; ROSSI, J.L. . Efeito do estiramento à frio no aço utilizado na fabricação de rodas avaliado por propriedades mecânicas. In: ENCONTRO CIENTÍFICO DE FÍSICA APLICADA,11., 1-4 de dezembro, 2020, Vitória, ES. Anais... São Paulo, SP: Blucher, 2021. p. 46-51. DOI: 10.5151/xiecfa-Alencar

    Abstract: Este estudo teve como objetivo a investigação e avaliação das propriedades mecânicas, antes e depois, dos processos de soldagem e do estiramento (metal spinning) do aço utilizado na fabricação de rodas para caminhões e ônibus. Comercialmente, a roda é constituída de dois componentes, o aro e o disco. O estiramento na fabricação de rodas é utilizado para aumentar a largura do componente aro, e na conformação do componente disco, que devem atender perfis determinados em projeto, de modo a resistir aos testes de fadiga por ciclagem e de momentos de flexão e torção, alternados. A presente proposta estudou os efeitos do processo de estiramento, pois com o melhor entendimento destes efeitos, poder-se-á maximizar a otimização da massa da roda, um importante objetivo a ser alcançado para o setor de fabricação de rodas de aço. Os métodos propostos para a identificação dos efeitos do estiramento no aço empregado para a fabricação de rodas foram ensaios de tração, análise metalográfica, análise do comportamento das deformações do material durante os ensaios de tração, utilizando a técnica de correlação de imagens digitais (DIC), somados a mapas de dureza, executados no material antes e após o processo de estiramento. As variações dos percentuais de redução de espessuras no processo de estiramento foram correlacionadas com as variações de resistência a tração, para verificação da relação da variação de espessura com a variação dos valores de resistência a tração, evidenciando um aumento na tensão de ruptura a tração a cada aumento de percentual de redução de espessura do material no estiramento, chegando a um aumento de 50% na resistência a tração, numa redução de 55% na espessura da matéria prima, com a consequente perda na deformação.

  • IPEN-DOC 28083

    ABBADE, L. ; LARA, J.A.C. ; ROSSI, A. ; ALENCAR, M.A. ; ROSSI, J.L. ; MUCSI, C.S. . Resultados preliminares do estudo da união de chapas de aços dissimilares pela técnica brasagem MIG. In: ENCONTRO CIENTÍFICO DE FÍSICA APLICADA,11., 1-4 de dezembro, 2020, Vitória, ES. Anais... São Paulo, SP: Blucher, 2021. p. 122-126. DOI: 10.5151/xiecfa-Abbade_Marcelo

    Abstract: A busca em fabricar veículos cada vez mais sustentáveis e seguros, por conta da crise dos recursos naturais e a preocupação com a segurança veicular, fez crescer o uso de novos matérias e métodos de conformação e união dos componentes da carroceria. As propriedades da coluna B determinam a segurança dos passageiros em caso de colisão lateral. A coluna B é constituída por materiais diferentes, e por isso, necessitam de um processo de união adequado. Assim, o objetivo do presente trabalho é realizar a caracterização mecânica da união entre o aço 22MnB5 tratado termicamente (têmpera) e o aço CR4, pela técnica brasagem MIG com adição do arame Cu-Si e o gás de proteção argônio. Os materiais utilizados foram, amostras do aço 22MnB5 revestidas por Al-Si e CR4 revestido por Zinco. A união foi realizada a partir de um projeto de corpo de prova, nomeado de furo oblongo regular. Os ensaios realizados (dureza Vickers e metalografia), se enquadram na norma AWS A5 C3. 3-2008. Os resultados obtidos, demonstraram uma queda na resistência mecânica na zona termicamente afetada pelo calor do aço 22MnB5, isso pode ter ocorrido devido ao aquecimento da região, que apresentou mudanças na microestrutura, porém a dureza desse material ainda é maior que no CR4. Nesse caso é foi possível concluir que mesmo com queda na resistência do aço 22MnB5, em um possível ensaio de tração o destacamento da união ocorreria no CR4, uma vez que a resistência deste material é menor.

  • IPEN-DOC 28082

    SANTOS, ADIMIR dos ; SANTOS, DIOGO F. dos . Reactor noise experiments considering high frequencies in the IPEN/MB-01 reactor. EPJ Web of Conferences, v. 247, p. 1-8, 2021. DOI: 10.1051/epjconf/202124708010

    Abstract: Reactor noise experiments at high frequencies (up to 100 kHz) in subcritical configurations have been performed at the IPEN/MB-01 research reactor facility. The core configuration considered a short version of the IPEN/MB-01 core in a 24 × 26 rectangular array of fuel rods. The subcritical configurations considered the control banks totally withdrawn and the moderator poisoned with H3BO3. The boron concentrations were: 286.8 ± 10 and 578.6 ± 10 ppm. The pulses of two 3He detectors in the reflector region were summed and inserted into the IPEN/MB-01 Correlator and the APSD (Auto Power Spectral Density) was inferred through a mathematical model. The analysis reveals that the APSD in this frequency range is best described by a four-mode decay model. According to the two-region two-group (thermal and fast) kinetic model developed in this work, the first two decay modes describe the thermal group and the other two describe the fast group. After a tedious and severe analyses of the least-square fit of the experimental data, it was concluded that the kinetic behavior of the thermal and fast neutrons can be considered uncoupled. The analysis of the experimental data is still in progress and only the thermal group of the case of 286.8 ppm of boron was analyzed and some parameters could be inferred. The most important one so far is the prompt neutron generation time in the core region that could be inferred with a good level of accuracy.

    Palavras-Chave: reactor noise; spectral density; accuracy; reactor cores; lifetime; reactor kinetics

  • IPEN-DOC 28081

    SGOUROS, O.; CAVALLARO, M.; CAPPUZZELLO, F.; CARBONE, D.; AGODI, C.; ALTANA, C.; BRISCHETTO, G.A.; BURRELLO, S.; CALABRESE, S.; CALVO, D.; CAPIROSSI, V.; CHAVEZ LOMELI, E.R.; CIRALDO, I.; CUTULI, M.; DE GREGORIO, G.; DELAUNAY, F.; DJAPO, H.; EKE, C.; FINOCCHIARO, P.; FISICHELLA, M.; FOTI, A.; GARGANO, A.; HACISALIHOGLU, A.; IAZZI, F.; LA FAUCI, L.; LINARES, R.; LUBIAN, J.; MEDINA, N.H.; MORALLES, M. ; OLIVEIRA, J.R.B.; PAKOU, A.; PANDOLA, L.; PINNA, F.; RUSSO, G.; GUAZZELLI, M.A.; SOUKERAS, V.; SOULIOTIS, G.; SPATAFORA, A.; TORRESI, D.; YILDIRIM, A.; ZAGATTO, V.A.B.. Recent results for the one-proton transfer reaction in the 18O+48Ti collision at 275 MeV. EPJ Web of Conferences, v. 252, p. 1-5, 2021. DOI: 10.1051/epjconf/202125204002

    Abstract: The 18O+48Ti reaction was studied at the energy of 275 MeV for the first time under the NUMEN and NURE experimental campaigns with the aim to investigate the complete net of reaction channels potentially involved in the 48Ca→48Ti double charge exchange transition. Such a transition is of great interest because of its relevance to the extraction of 48Ca→48Ti double beta decay nuclear matrix element. The relevant experiment was carried out at the MAGNEX facility of INFN-LNS in Catania. Angular distribution measurements for the various reaction products were performed by using the MAGNEX large acceptance magnetic spectrometer. The present contribution is focused on the analysis of the one-proton transfer channel with emphasis on the particle identification technique and the estimation of background contaminations.

    Palavras-Chave: matrix elements; transfer reactions; oxygen 18; titanium 48; protons

  • IPEN-DOC 28080

    CAPPUZZELLO, FRANCESCO; ACOSTA, LUIS; AGODI, CLEMENTINA; ALTANA, CARMEN; AMADOR-VALENZUELA, PAULINA; BOZTOSUN, ISMAIL; BRISCHETTO, GIUSEPPE A.; CALABRESE, SALVATORE; CALVO, DANIELA; CAPIROSSI, VITTORIA; CARBONE, DIANA; CAVALLARO, MANUELA; CHAVEZ LOMELI, EFRAIN R.; CIRALDO, IRENE; CUTULI, MAURO; DELAUNAY, FRANCK; DJAPO, HARIS; EKE, CANEL; FINOCCHIARO, PAOLO; FIRAT, SUNA; FISICHELLA, MARIA; GUAZZELLI DA SILVEIRA, MARCILEI A.; HACISALIHOGLU, AYLIN; IAZZI, FELICE; LANZALONE, GAETANO; LA FAUCI, LAURA; LINARES, ROBERTO; MEDINA, NILBERTO H.; MORALLES, MAURICIO ; OLIVEIRA, JOSE R.B.; PAKOU, ATHENA; PANDOLA, LUCIANO; PETRASCU, HORIA; PINNA, FEDERICO; RUSSO, GIUSEPPE; SANTOS, ROBERTO B.B.; SGOUROS, ONOUFRIOS; SOLAKCI, SELCUK O.; SOULIOTIS, GEORGE; SOUKERAS, VASILEIOS; SPATAFORA, ALESSANDRO; TORRESI, DOMENICO; TUDISCO, SALVATORE; YILDIRIN, AYDIN; ZAGATTO, VINICIUS A.B.. Recent experimental activity on heavy-ion induced reactions within the NUMEN project. EPJ Web of Conferences, v. 252, p. 1-5, 2021. DOI: 10.1051/epjconf/202125204001

    Abstract: The possibility to use a special class of heavy-ion induced direct reactions, such as double charge exchange reactions, is discussed in view of their application to extract information that may be helpful to determinate the nuclear matrix elements entering in the expression of neutrinoless double beta decay half-life. The strategies adopted in the experimental campaigns performed at INFN - Laboratori Nazionali del Sud are briefly described, emphasizing the advantages of the multi-channel approach to nuclear reaction data analysis.

    Palavras-Chave: nuclear matrix; matrix elements; charge exchange; heavy ions; double beta decay

  • IPEN-DOC 28079

    CAVALLARO, MANUELA; BELLONE, JESSICA I.; CALABRESE, SALVATORE; AGODI, CLEMENTINA; BURRELLO, STEFANO; CAPPUZZELLO, FRANCESCO; CARBONE, DIANA; COLONNA, MARIA; DESHMUKH, N.; LENSKE, H.; SPATAFORA, A.; ACOSTA, L.; AMADOR-VALENZUELA, P.; BORELLO-LEWIN, T.; BRISCHETTO, G.A.; CALVO, D.; CAPIROSSI, V.; CHAVEZ, E.; CIRALDO, I.; CUTULI, M.; DELAUNAY, F.; DJAPO, H.; EKE, C.; FINOCCHIARO, P.; FIRAT, S.; FISICHELLA, M.; FOTI, A.; GUAZZELLI, M.A.; HACISALIHOGLU, A.; IAZZI, F.; LA FAUCI, L.; LINARES, R.; LUBIAN, J.; MEDINA, N.H.; MORALLES, M. ; OLIVEIRA, J.R.B.; PAKOU, A.; PANDOLA, LUCIANO; PETRASCU, H.; PINNA, F.; RUSSO, G.; SGOUROS, O.; SOLAKCI, S.O.; SOUKERAS, V.; SOULIOTIS, G.; TORRESI, D.; TUDISCO, SALVATORE; YILDIRIN, A.; ZAGATTO, V.A.B.. A constrained analysis of the 40Ca(18O,18F)40K direct charge exchange reaction mechanism at 275 MeV. Frontiers in Astronomy and Space Sciences, v. 8, p. 1-11, 2021. DOI: 10.3389/fspas.2021.659815

    Abstract: The 40Ca(18O,18F)40K single charge exchange (SCE) reaction is explored at an incident energy of 275 MeV and analyzed consistently by collecting the elastic scattering and inelastic scattering data under the same experimental conditions. Full quantum-mechanical SCE calculations of the direct mechanism are performed by includingmicroscopic nuclear structure inputs and adopting either a bare optical potential or a coupled channel equivalent polarization potential (CCEP) constrained by the elastic and inelastic data. The direct SCE mechanism describes the magnitude and shape of the angular distributions rather well, thus suggesting the suppression of sequential multi-nucleon transfer processes.

    Palavras-Chave: double beta decay; charge exchange; magnetic spectrometers; elastic scattering; nuclear physics

  • IPEN-DOC 28078

    MALDONADO, E.P.; SAMAD, R.E. ; BONATTO, A.; NUNES, R.P.; BANERJEE, S.; VIEIRA JUNIOR, N.D. . Study of quasimonoenergetic electron bunch generation in self-modulated laser wakefield acceleration using TW or sub-TW ultrashort laser pulses. AIP Advances, v. 11, n. 6, p. 065116-1 - 065116-10, 2021. DOI: 10.1063/5.0052831

    Abstract: This work presents a study on laser wakefield electron acceleration in the self-modulated regime (SM-LWFA) using 50-fs laser pulses with energy on the mJ scale, at λ = 0.8 μm, impinging on a thin H2 gas jet. Particle-in-cell simulations were performed using laser peak powers ranging from sub-terawatt to a few terawatts and plasma densities varying from the relativistic self-focusing threshold up to values close to the critical density. The differences in the obtained acceleration processes are discussed. Results show that bunched electron beams with full charge on the nC scale and kinetic energy in the MeV range can be produced and configurations with peak density in the range 0.5–5 × 1020 atoms/cm3 generate electrons with maximum energies. In this range, some simulations generated quasimonoenergetic bunches with ∼0.5% of the total accelerated charge and we show that the beam characteristics, process dynamics, and operational parameters are close to those expected for the blowout regime. The configurations that led to quasimonoenergetic bunches from the sub-TW SM-LWFA regime allow the use of laser systems with repetition rates in the kHz range, which can be beneficial for practical applications.

    Palavras-Chave: electron beams; laser radiation; pulses; modulation; tail electrons

  • IPEN-DOC 28077

    QUEIROZ, FERNANDA M.; TERADA, MAYSA; BUGARIN, ALINE F.S. ; MELO, HERCILIO G. de; COSTA, ISOLDA . Comparison of corrosion resistance of the AA2524-T3 and the AA2024-T3. Metals, v. 11, n. 6, p. 1-14, 2021. DOI: 10.3390/met11060980

    Abstract: The 2XXX Al alloys are characterized by their superior mechanical properties resulting from alloying elements and precipitation hardening treatments. The AA2524-T3 alloy was developed to replace the AA2024-T3 alloy in the aerospace industry. However, both alloys present many intermetallic particles (IMCs) in their microstructure, and this is the main reason for their high susceptibility to localized corrosion (such as pitting and stress corrosion cracking). Despite the similarities between these alloys (e.g., chemical composition and type of intermetallics) the literature comparing their properties is scarce and focuses mainly on their mechanical properties, not their corrosion resistances. In this investigation, the corrosion resistance of the AA2524-T3 alloy was compared to the AA2024-T3 alloy. The microstructure of both alloys was analyzed by Scanning Electron Microscopy before and after immersion in the test electrolyte, and the number and area fraction of intermetallics of each alloy was determined. The corrosion resistance of both alloys was monitored as a function of exposure time by electrochemical impedance spectroscopy and the results were fitted using electrical equivalent circuits. The AA2524-T3 alloy presented not only higher impedance values but also less corroded areas than the AA2024-T3 alloy.

    Palavras-Chave: aluminium alloys; corrosion; microstructure; aerospace industry; intermetallic compounds

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A pesquisa no RD utiliza os recursos de busca da maioria das bases de dados. No entanto algumas dicas podem auxiliar para obter um resultado mais pertinente.

É possível efetuar a busca de um autor ou um termo em todo o RD, por meio do Buscar no Repositório , isto é, o termo solicitado será localizado em qualquer campo do RD. No entanto esse tipo de pesquisa não é recomendada a não ser que se deseje um resultado amplo e generalizado.

A pesquisa apresentará melhor resultado selecionando um dos filtros disponíveis em Navegar

Os filtros disponíveis em Navegar tais como: Coleções, Ano de publicação, Títulos, Assuntos, Autores, Revista, Tipo de publicação são autoexplicativos. O filtro, Autores IPEN apresenta uma relação com os autores vinculados ao IPEN; o ID Autor IPEN diz respeito ao número único de identificação de cada autor constante no RD e sob o qual estão agrupados todos os seus trabalhos independente das variáveis do seu nome; Tipo de acesso diz respeito à acessibilidade do documento, isto é , sujeito as leis de direitos autorais, ID RT apresenta a relação dos relatórios técnicos, restritos para consulta das comunidades indicadas.

A opção Busca avançada utiliza os conectores da lógica boleana, é o melhor recurso para combinar chaves de busca e obter documentos relevantes à sua pesquisa, utilize os filtros apresentados na caixa de seleção para refinar o resultado de busca. Pode-se adicionar vários filtros a uma mesma busca.

Exemplo:

Buscar os artigos apresentados em um evento internacional de 2015, sobre loss of coolant, do autor Maprelian.

Autor: Maprelian

Título: loss of coolant

Tipo de publicação: Texto completo de evento

Ano de publicação: 2015

Para indexação dos documentos é utilizado o Thesaurus do INIS, especializado na área nuclear e utilizado em todos os países membros da International Atomic Energy Agency – IAEA , por esse motivo, utilize os termos de busca de assunto em inglês; isto não exclui a busca livre por palavras, apenas o resultado pode não ser tão relevante ou pertinente.

95% do RD apresenta o texto completo do documento com livre acesso, para aqueles que apresentam o significa que e o documento está sujeito as leis de direitos autorais, solicita-se nesses casos contatar a Biblioteca do IPEN, bibl@ipen.br .

Ao efetuar a busca por um autor o RD apresentará uma relação de todos os trabalhos depositados no RD. No lado direito da tela são apresentados os coautores com o número de trabalhos produzidos em conjunto bem como os assuntos abordados e os respectivos anos de publicação agrupados.

O RD disponibiliza um quadro estatístico de produtividade, onde é possível visualizar o número dos trabalhos agrupados por tipo de coleção, a medida que estão sendo depositados no RD.

Na página inicial nas referências são sinalizados todos os autores IPEN, ao clicar nesse símbolo será aberta uma nova página correspondente à aquele autor – trata-se da página do pesquisador.

Na página do pesquisador, é possível verificar, as variações do nome, a relação de todos os trabalhos com texto completo bem como um quadro resumo numérico; há links para o Currículo Lattes e o Google Acadêmico ( quando esse for informado).

ATENÇÃO!

ESTE TEXTO "AJUDA" ESTÁ SUJEITO A ATUALIZAÇÕES CONSTANTES, A MEDIDA QUE NOVAS FUNCIONALIDADES E RECURSOS DE BUSCA FOREM SENDO DESENVOLVIDOS PELAS EQUIPES DA BIBLIOTECA E DA INFORMÁTICA.

O gerenciamento do Repositório está a cargo da Biblioteca do IPEN. Constam neste RI, até o presente momento 20.950 itens que tanto podem ser artigos de periódicos ou de eventos nacionais e internacionais, dissertações e teses, livros, capítulo de livros e relatórios técnicos. Para participar do RI-IPEN é necessário que pelo menos um dos autores tenha vínculo acadêmico ou funcional com o Instituto. Nesta primeira etapa de funcionamento do RI, a coleta das publicações é realizada periodicamente pela equipe da Biblioteca do IPEN, extraindo os dados das bases internacionais tais como a Web of Science, Scopus, INIS, SciElo além de verificar o Currículo Lattes. O RI-IPEN apresenta também um aspecto inovador no seu funcionamento. Por meio de metadados específicos ele está vinculado ao sistema de gerenciamento das atividades do Plano Diretor anual do IPEN (SIGEPI). Com o objetivo de fornecer dados numéricos para a elaboração dos indicadores da Produção Cientifica Institucional, disponibiliza uma tabela estatística registrando em tempo real a inserção de novos itens. Foi criado um metadado que contém um número único para cada integrante da comunidade científica do IPEN. Esse metadado se transformou em um filtro que ao ser acionado apresenta todos os trabalhos de um determinado autor independente das variáveis na forma de citação do seu nome.

A elaboração do projeto do RI do IPEN foi iniciado em novembro de 2013, colocado em operação interna em julho de 2014 e disponibilizado na Internet em junho de 2015. Utiliza o software livre Dspace, desenvolvido pelo Massachusetts Institute of Technology (MIT). Para descrição dos metadados adota o padrão Dublin Core. É compatível com o Protocolo de Arquivos Abertos (OAI) permitindo interoperabilidade com repositórios de âmbito nacional e internacional.

1. Portaria IPEN-CNEN/SP nº 387, que estabeleceu os princípios que nortearam a criação do RDI, clique aqui.


2. A experiência do Instituto de Pesquisas Energéticas e Nucleares (IPEN-CNEN/SP) na criação de um Repositório Digital Institucional – RDI, clique aqui.

O Repositório Digital do IPEN é um equipamento institucional de acesso aberto, criado com o objetivo de reunir, preservar, disponibilizar e conferir maior visibilidade à Produção Científica publicada pelo Instituto, desde sua criação em 1956.

Operando, inicialmente como uma base de dados referencial o Repositório foi disponibilizado na atual plataforma, em junho de 2015. No Repositório está disponível o acesso ao conteúdo digital de artigos de periódicos, eventos, nacionais e internacionais, livros, capítulos, dissertações, teses e relatórios técnicos.

A elaboração do projeto do RI do IPEN foi iniciado em novembro de 2013, colocado em operação interna em julho de 2014 e disponibilizado na Internet em junho de 2015. Utiliza o software livre Dspace, desenvolvido pelo Massachusetts Institute of Technology (MIT). Para descrição dos metadados adota o padrão Dublin Core. É compatível com o Protocolo de Arquivos Abertos (OAI) permitindo interoperabilidade com repositórios de âmbito nacional e internacional.

O gerenciamento do Repositório está a cargo da Biblioteca do IPEN. Constam neste RI, até o presente momento 20.950 itens que tanto podem ser artigos de periódicos ou de eventos nacionais e internacionais, dissertações e teses, livros, capítulo de livros e relatórios técnicos. Para participar do RI-IPEN é necessário que pelo menos um dos autores tenha vínculo acadêmico ou funcional com o Instituto. Nesta primeira etapa de funcionamento do RI, a coleta das publicações é realizada periodicamente pela equipe da Biblioteca do IPEN, extraindo os dados das bases internacionais tais como a Web of Science, Scopus, INIS, SciElo além de verificar o Currículo Lattes. O RI-IPEN apresenta também um aspecto inovador no seu funcionamento. Por meio de metadados específicos ele está vinculado ao sistema de gerenciamento das atividades do Plano Diretor anual do IPEN (SIGEPI). Com o objetivo de fornecer dados numéricos para a elaboração dos indicadores da Produção Cientifica Institucional, disponibiliza uma tabela estatística registrando em tempo real a inserção de novos itens. Foi criado um metadado que contém um número único para cada integrante da comunidade científica do IPEN. Esse metadado se transformou em um filtro que ao ser acionado apresenta todos os trabalhos de um determinado autor independente das variáveis na forma de citação do seu nome.