MAURICIO MORALLES

Resumo

Bacharelado (1986), Mestrado (1989) e Doutorado (1994) em Física pela Universidade de São Paulo. Realizou mestrado e doutorado em estudos de estrutura nuclear utilizando técnicas de espectroscopia de raios gama. Trabalhou no Laboratório do Acelerador da Universidade de Munique (Alemanha) entre 1989 e 1992, onde realizou a parte experimental de seu trabalho de doutorado. Atualmente é pesquisador e professor da pós-graduação do Instituto de Pesquisas Energéticas e Nucleares, na área de concentração de Tecnologia Nuclear. Tem experiência na área de Física, com ênfase em métodos experimentais e instrumentação para física nuclear. Atua principalmente nos seguintes temas: simulações com Método de Monte Carlo, instrumentação nuclear aplicada à medicina, dosimetria, estrutura nuclear, espectroscopia de raios gama e de raios X, detecção de nêutrons. Mantém colaborações em trabalhos relacionados a interações hiperfinas (correlação angular perturbada) e física de nêutrons. (Texto extraído do Currículo Lattes em 17 nov. 2021)

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Agora exibindo 1 - 10 de 115
  • Artigo IPEN-doc 30495
    Study of single-nucleon transfer reactions in the 18O+48Ti collision at 275 MeV
    2024 - SGOUROS, O.; CAPPUZZELLO, F.; CAVALLARO, M.; CARBONE, D.; AGODI, C.; BRISCHETTO, G.A.; CALVO, D.; CHAVEZ LOMELI, E.R.; CIRALDO, I.; CUTULI, M.; DE GREGORIO, G.; DELAUNAY, F.; DJAPO, H.; EKE, C.; FINOCCHIARO, P.; FISICHELLA, M.; GARGANO, A.; GUAZZELLI, M.A.; HACISALIHOGLU, A.; LINARES, R.; LUBIAN, J.; MEDINA, N.H.; MORALLES, M.; OLIVEIRA, J.R.B.; PAKOU, A.; PANDOLA, L.; SOUKERAS, V.; SOULIOTIS, G.; SPATAFORA, A.; TORRESI, D.; YILDIRIM, A.; ZAGATTO, V.A.B.
    The study of single-nucleon transfer reactions for the 18O+48Ti system was pursued at the energy of 275 MeV as part of a more systematic study which is undertaken within the NUMEN and NURE experimental campaigns. The aim is to measure the complete set of available reaction network which are characterized by the same initial and final-state wavefunctions as the more suppressed double charge exchange reactions. Understanding the degree of competition between successive nucleon transfer and double charge exchange reactions is crucial for the description of the meson-exchange mechanism. In this respect, angular distribution measurements for one- and twonucleon transfer reactions for the 18O+48Ti system were carried out at theMAGNEX facility of INFN-LNS in Catania. An overview of the data analysis for the 48Ti(18O,19F)47Sc and 48Ti(18O,17O)49Ti reactions will be presented.
  • Artigo IPEN-doc 30494
    The multichannel experimental and theoretical study of the 12C(18O,18F)12B single charge exchange reaction mechanism
    2024 - SPATAFORA, ALESSANDRO; CARBONE, DIANA; CAPPUZZELLO, FRANCESCO; CAVALLARO, MANUELA; ACOSTA, LUIS E.; AGODI, CLEMENTINA; AMADOR-VALENZUELA, PAULINA; BORELLO-LEWIN, THEREZA; BRISCHETTO, GIUSEPPE A.; CALVO, DANIELA; CHAVEZ-LOMELI, EFRAIN R.; CIRALDO, IRENE; DE GREGORIO, GIOVANNI; DELAUNAY, FRANCK; DJAPO, HARIS; EKE, CANEL; FINOCCHIARO, PAOLO; FIRAT, SINA; FISICHELLA, MARIA; GARGANO, ANGELA; HACISALIHOGLU, AYLIN; LAY, JOSE A.; LINARES, ROBERTO; LUBIAN, JESUS; MEDINA, NILBERTO; MORALLES, MAURICIO; OLIVEIRA, JOSE R.B.; PAKOU, ATHENA; PANDOLA, LUCIANO; PETRASCU, HORIA; SGOUROS, ONOUFRIOS; SILVEIRA, MARCILEI, A.G. da; SOLAKCI, SELCUK O.; SOUKERAS, VASILIS; SOULIOTIS, GEORGE A.; TORRESI, DOMENICO; TUDISCO, SALVATORE; YILDIRIM, AYDIN; ZAGATTO, VINICIUS A.B.
    The study of a network of nuclear reactions populated in the 18O + 12C collision is the main topic of the present paper. It was performed to test nuclear structure and reaction theories in describing the full reaction mechanism occurring in the (18O, 18F) single charge exchange nuclear reaction. From the experimental side, an 18O beam was produced at 275 MeV incident energy by the K800 superconducting cyclotron and the MAGNEX magnetic spectrometer was used at the Laboratori Nazionali del Sud of the Istituto Nazionale di Fisica Nucleare to momentum analyse the ejectiles produced in the nuclear reactions within the same experimental setup. From the theoretical side, the proposed approach consists of analysing the whole network of nuclear reactions in the framework of a unique comprehensive and coherent theoretical calculation. This holistic approach, applied both to the experimental and theoretical analysis, is the main feature and novelty of the work presented here.
  • Artigo IPEN-doc 30489
    18O+48Ti elastic and inelastic scattering at 275 MeV
    2024 - BRISCHETTO, G.A.; SGOUROS, O.; CARBONE, D.; CAPPUZZELLO, F.; CAVALLARO, M.; LUBIAN, J.; DE GREGORIO, G.; AGODI, C.; CALVO, D.; CHAVEZ LOMELI, E.R.; CIRALDO, I.; DELAUNAY, F.; DJAPO, H.; EKE, C.; FINOCCHIARO, P.; FISICHELLA, M.; GARGANO, A.; GUAZZELLI, M.A.; HACISALIHOGLU, A.; LINARES, R.; MEDINA, N.H.; MORALLES, M.; OLIVEIRA, J.R.B.; PAKOU, A.; PANDOLA, L.; SOUKERAS, V.; SOULIOTIS, G.; SPATAFORA, A.; TORRESI, D.; YILDIRIM, A.; ZAGATTO, V.A.B.
    Background: In recent years, the NUMEN project has highlighted that the systematic study of double charge exchange (DCE) nuclear reactions could provide precious information on the nuclear matrix elements of neutrinoless double β decay. To achieve this goal, a multichannel approach was adopted, where a plethora of different reaction channels is measured under the same experimental conditions and analyzed in a coherent framework. In this context, the initial (ISI) and final (FSI) state interactions are fundamental building blocks to investigate all the relevant direct nuclear reactions. To date, such building blocks are not sufficiently established for many of the projectile-target pairs of interest for NUMEN experiments. This is also the case of the O18+Ti48 system, which is relevant for the double β decay of the Ca48 nucleus into the Ti48 one. Purpose: This work aims at deducing the ISI to be used in the multichannel study of the O18+Ti48 collision at 275 MeV incident energy. To this purpose, the optical potential and the strength of the couplings between elastic and inelastic scattering channels are determined and characterized by comparison with new experimental data. Methods: Cross section angular distributions were measured for the elastic and low-lying inelastic scattering channels in a wide range of momentum transfer. Experimental data were compared to theoretical calculations performed in optical model (OM), distorted-wave Born approximation (DWBA), coupled channels (CC), and coupled channels equivalent polarization potential (CCEP) approaches. For all of them, the São Paulo double-folding potential was adopted as the optical potential. The comparison between the predictions of the OM/DWBA and CC frameworks allowed to evaluate the strength of the couplings to the inelastic channels which were explicitly taken into account. Within the CC formalism, different coupling schemes were compared to assess the contributions of the states included in the model space. A further test of our approach was carried out by analyzing the experimental data of the same system at 54 MeV incident energy. Results: The achieved energy resolution allowed to resolve the elastic scattering and the excitation of the 21+ state of the Ti48 nucleus. A broad structure, associated to the superposition of the inelastic transitions to the 21+ state of O18 and to three excited states of Ti48, was also observed. The OM and DWBA calculations are not able to reproduce the experimental elastic and inelastic angular distributions in the explored range of momentum transfer. A significant improvement in the description of the data is found by using the CC approach. In particular, when the 21+ and 31- collective states of projectile and target and their simultaneous excitations are included in the coupling scheme, a satisfactory agreement is achieved. The CCEP predictions describe reasonably well the elastic scattering data. Conclusions: Channel coupling effects have to be taken into account for a good description of the elastic and inelastic experimental angular distributions in the measured range of momentum transfer. The inclusion of such couplings in the ISI is envisaged for the analysis of all the direct nuclear reactions induced by the O18+Ti48 collision in this incident energy region.
  • Artigo IPEN-doc 30357
    Investigation of 76Se(18O, 17O)75Se and 76Se(18O, 19F)75As transfer reactions at 15 MeV/u in a multi-channel approach within the NUMEN project
    2024 - CIRALDO, I.; CAPPUZZELLO, F.; CAVALLARO, M.; CARBONE, D.; GARGANO, A.; DE GREGORIO, G.; GARCIA-TECOCOATZI, H.; SANTOPINTO, E.; MAGANA-VSEVOLODOVNA, R.I.; ACOSTA, L.; AGODI, C.; AMADOR-VALENZUELA, P.; BRISCHETTO, G.A.; BURRELLO, S.; CALVO, D.; CHAVEZ LOMELI, E.R.; COLONNA, M.; DELAUNAY, F.; DJAPO, H.; EKE, C.; FINOCCHIARO, P.; FIRAT, S.; FISICHELLA, M.; GUAZZELLI, M.A.; HACISALIHOGLU, A.; LINARES, R.; MEDINA, N.H.; MORALLES, M.; OLIVEIRA, J.R.B.; PAKOU, A.; PANDOLA, L.; PETRASCU, H.; PINNA, F.; SGOUROS, O.; SOLAKCI, S.O.; SOUKERAS, V.; SOULIOTIS, G.; SPATAFORA, A.; TORRESI, D.; TUDISCO, S.; YILDIRIM, A.; ZAGATTO, V.A.B.
    A full-comprehensive study of heavy-ion induced nuclear reactions is a powerful tool to characterize nuclear mean-field features as well as fewnucleon correlations in low-lying nuclear states. In this context, the investigation of 76Se(18O, 17O)75Se and 76Se(18O, 19F)75As transfer reactions was performed with the NUMEN project, aiming at providing data-driven information to constrain nuclear structure models for the 76Se nucleus. This nucleus is under investigation since it is the daughter nucleus of 76Ge in the neutrinoless double beta decay (0νββ) process. The experiment was performed at INFN-LNS where the 18O beam impinged the 76Se target and the reaction ejectiles were momentum analyzed by the MAGNEX magnetic spectrometer.
  • Artigo IPEN-doc 30356
    Elastic scattering angular distribution for the 18O + 48Ti collision at 275 MeV within the NUMEN project
    2024 - BRISCHETTO, G.A.; SGOUROS, O.; CARBONE, D.; CAPPUZZELLO, F.; CAVALLARO, M.; LUBIAN, J.; DE GREGORIO, G.; AGODI, C.; CALVO, D.; CHAVEZ LOMELI, E.R.; CIRALDO, I.; DELAUNAY, F.; DJAPO, H.; EKE, C.; FINOCCHIARO, P.; FISICHELLA, M.; GARGANO, A.; GUAZZELLI, M.A.; HACISALIHOGLU, A.; LINARES, R.; MEDINA, N.H.; MORALLES, M.; OLIVEIRA, J.R.B.; PAKOU, A.; PANDOLA, L.; SOUKERAS, V.; SOULIOTIS, G.; SPATAFORA, A.; TORRESI, D.; YILDIRIM, A.; ZAGATTO, V.A.B.
    In the context of the NUMEN project, the 18O + 48Ti collision at 275 MeV incident energy was studied for the first time. In the adopted multichannel approach, the elastic scattering was measured in order to deduce the initial state interaction and the corresponding optical potential. The angular distribution of elastic scattering was determined across a wide range of scattering angles.
  • Artigo IPEN-doc 30215
    Synchrotron light source X-ray detection with LowGain Avalanche Diodes
    2023 - MAZZA, S.M.; SAITO, G.; ZHAO, Y.; KIRKES, T.; YOHO, N.; YERDEA, D.; NAGEL, N.; OTT, J.; NIZAM, M.; LEITE, M.; MORALLES, M.; SADROZINSKI, H.F.-W.; SEIDEN, A.; SCHUMM B.; MCKINNEY-MARTINEZ, F.; GIACOMINI, G.; CHEN, W.
    Low Gain Avalanche Diodes (LGADs) represent the state-of-the-art in timing measurements and will instrument the future Timing Detectors of ATLAS and CMS for the High-Luminosity LHC. While initially conceived as a sensor for charged particles, the intrinsic gain of LGADs makes it possible to detect low-energy X-rays with good energy resolution and excellent time resolution (tens of picoseconds). Using the Stanford Synchrotron Radiation Lightsource (SSRL) at SLAC, several LGADs designs were characterized with energies from 5 to 70 keV. The SSRL provides 10 ps pulsed X-ray bunches separated by 2 ns intervals with an energy dispersion (Delta E/ E) of 10(-4). LGADs from Hamamatsu Photonics (HPK) and Brookhaven National Laboratory (BNL) with different thicknesses ranging from 20 mu m to 50 mu m and different gain layer designs were read out using fast amplification boards and digitized with a high bandwidth and high sampling rate oscilloscope. PIN devices from HPK and AC-LGADs from BNL were characterized as well. A systematic and detailed characterization of the devices' energy linearity, resolution, and time resolution as a function of X-ray energy was performed for different biasing voltages at room temperature and are reported in this work. The charge collection and multiplication mechanism were simulated using Geant4 and TCAD Sentaurus, providing an important handle for interpreting the data.
  • Artigo IPEN-doc 29955
    New high intensity Heavy - Ion beams @ INFN-LNS: NUMEN project status and perspective
    2023 - AGODI, C.; CAPPUZZELLO, F.; ACOSTA, L.; AMADOR-VALENZUELA, P.; AUERBACH, N.; AVANZI, L.H.; BELLONE, J.I.; BIJKER, R.; BOZTOSUN, I.; BRASOLIN, S.; BRISCHETTO, G.A.; BURRELLO, S.; BUSSA, M.P.; CALABRESE, S.; CALVO, D.; CAMPAJOLA, L.; CAPIROSSI, V.; CARBONE, D.; CARDOZO, E.N.; CAVALLARO, M.; CHAVEZ LOMELI, E.R.; CHINAGLIA, E.F.; CIRALDO, I.; COLONNA, M.; COSTA, K.M.; DAPO, H.; BENEDICTIS, C. de; GREGORIO, G. de; DELAUNAY, F.; DONALDSON, L.M.; DUMITRACHE, F.; EKE, C.; FERRARESI, C.; FERREIRA, J.L.; FERRETTI, J.; FINOCCHIARO, P.; FIRAT, S.; FISICHELLA, M.; GALLIAN, S.; GAMBACURTA, D.; GANDOLFO, E.M.; GARCIA-TECOCOATZI, H.; GARGANO, A.; GIOVANNINI, M.; GUAZZELLI, M.A.; HACISALIHOGLU, A.; HUERTA HERNANDEZ, A.; IAZZI, F.; ISAAK, J.; KHUMALO, T.; KOTILA, J.; KOULOURIS, S.; KUCUK, Y.; LANZALONE, G.; LAVAGNO, A.; LAY, J.A.; LENSKE, H.; LINARES, R.; LUBIAN, J.; MARIN-LAMBARRI, D.J.; MASUNAGA, S.H.; MEDINA, N.H.; MEREU, P.; MORALLES, M.; NERI, L.; NEVELING, R.; OLIVEIRA, J.R.B.; PAKOU, A.; PANDOLA, L.; PANERO, R.; PELLEGRI, L.; PERSIANI, R.; PETRASCU, H.; PIETRALLA, N.; PINNA, F.; RUSSO, A.D.; RUSSO, G.; SANTARELLI, T.M.; SANTOPINTO, E.; SANTOS, R.B.B.; SARTIRANA, D.; SGOUROS, O.; SHARMA, V.R.; SOLAKCI, S.O.; SOUKERAS, V.; SOULIOTIS, G.; SPATAFORA, A.; TORRESI, D.; TUDISCO, S.; VARGAS HERNANDEZ, H.; VILLAGRAN, R.G.; WERNER, V.; YILDIRIM, A.; ZAGATTO, V.A.B.
    The upgrade project POTLNS to produce high-intensity beams has already started at INFN- Laboratori Nazionali del Sud in Catania (Italy). The POTLNS project was triggered by the NUMEN physics case that aims to provide experimental information on the Nuclear Matrix Elements (NMEs) that enter in the expression of the neutrino-less double beta (0νββ) decay halflife. The tools proposed by NUMEN project are the cross-section measurements of nuclear Double Charge Exchange (DCE) reactions. The search for 0νββ decay is currently a key topic in physics, due to its possible wide implications for nuclear physics, particle physics and cosmology: the NUMEN project could provide a crucial contribution in this search.
  • Artigo IPEN-doc 29928
    One-neutron transfer reaction in the 18O + 48Ti collision at 275 MeV
    2023 - SGOUROS, O.; CUTULI, M.; CAPPUZZELLO, F.; CAVALLARO, M.; CARBONE, D.; AGODI, C.; GREGORIO, G. de; GARGANO, A.; LINARES, R.; BRISCHETTO, G.A.; CALVO, D.; CHAVEZ LOMELI, E.R.; CIRALDO, I.; DELAUNAY, F.; DJAPO, H; EKE, C.; FINOCCHIARO, P.; FISICHELLA, M.; GUAZZELLI, M.A.; HACISALIHOGLU, A.; LUBIAN, J.; MEDINA, N.H.; MORALLES, M.; OLIVEIRA, J.R.B.; PAKOU, A.; PANDOLA, L.; SOUKERAS, V.; SOULIOTIS, G.; SPATAFORA, A.; TORRESI, D.; YILDIRIM, A.; ZAGATTO, V.A.B.
    The present article reports new data on the 48Ti(18O, 17O) 49Ti reaction at 275 MeV incident energy as part of the systematic research pursued within the NUMEN (NUclear Matrix Elements for Neutrinoless double β decay) project. Supplementary measurements of the same reaction on 16O and 27Al targets were also performed in order to estimate the background arising from the use of a composite target (TiO2 + 27Al). These data were analyzed under the same theoretical framework as those obtained with the titanium target in order to reinforce the conclusions of our analysis. Differential cross-section angular distribution measurements for the 17O8+ ejectiles were performed in a wide angular range by using the MAGNEX large acceptance magnetic spectrometer. The experimental results were analyzed within the distorted-wave and coupled-channels Born approximation frameworks. The optical potentials at the entrance and exit channels were calculated in a double folding approach adopting the São Paulo potential, and the spectroscopic amplitudes for the projectile and target overlaps were obtained from large-scale shell model calculations. The differential cross sections are well described by the theoretical calculations, where a weak coupling to collective excitations of projectile and target is inferred. The sensitivity of transfer cross sections on different model spaces adopted in nuclear structure calculations is also discussed.
  • Artigo IPEN-doc 29893
    The NUMEN project
    2023 - CARBONE, D.; AGODI, C.; BELLONE, J.I.; BURRELLO, S.; CALABRESE, S.; CAPPUZZELLO, F.; CAVALLARO, M.; COLONNA, M.; DE GREGORIO, G.; FERREIRA, J.L.; GARGANO, A.; LENSKE, H.; SGOUROS, O.; SPATAFORA, A.; ACOSTA, L.; AMADOR-VALENZUELA, P.; BRISCHETTO, G.A.; CALVO, D.; CAPIROSSI, V.; CHÀVEZ LOMELÌ, E.R.; CIRALDO, I.; DELAUNAY, F.; DJAPO, H.; EKE, C.; FINOCCHIARO, P.; FIRAT, S.; FISICHELLA, M.; GUAZZELLI, M.A.; HACISALIHOGLU, A.; IAZZI, F.; LAY, J.A.; LINARES, R.; LUBIAN, J.; MEDINA, N.H.; MORALLES, M.; OLIVEIRA, J.R.B.; PAKOU, A.; PANDOLA, L.; PETRASCU, H.; PINNA, F.; RUSSO, G.; SOLAKCI, S.O.; SOUKERAS, V.; SOULIOTIS, G.; TORRESI, D.; TUDISCO, S.; YILDIRIM, A.; ZAGATTO, V.A.B.
    Different reactions channels induced by the 18O + 40Ca collisions at 275 MeV incident energy are simultaneously measured and analysed consistently within the same reaction and structure frameworks within the NUMEN project. The project aims to provide data-driven information for the determination of the nuclear matrix elements involved in the neutrinoless double beta decay. In particular, the elastic and inelastic scattering, one- and two-proton transfer, one-neutron transfer, and single charge exchange reactions are explored. The full quantum-mechanical calculations, performed by including microscopic nuclear structure inputs, describe well all the experimental data, giving support to a multi-channel strategy for the analysis of heavy-ion induced direct reactions.
  • Relatório IPEN-doc 29843
    Espectrometria gama dos Geradores de Vapor e da Tampa do Vaso do Reator depositados no DIGV (medidas preliminares)
    2023 - MEDEIROS, JOSE A.G. de; MORALLES, MAURICIO; SILVA JUNIOR, IREMAR A. da; YORIYAZ, HELIO; ZAHN, GUILHERME; GENEZINI, FREDERICO A.; SOUZA, FRANCISCO A.
    Este documento tem como objetivo apresentar os resultados das medidas preliminares de espectrometria gama dos Geradores de Vapor (GVs) e da Tampa do Vaso do Reator (TVR), realizadas entre os dias 02 e 10 de fevereiro de 2023. Estes equipamentos foram removidos de Angra 1 em 2009 e 2013, respectivamente, e se encontram no Depósito Inicial dos Geradores de Vapor (DIGV) no sítio da Central Nuclear Almirante Álvaro Alberto (CNAAA). As medidas de espectrometria gama buscam possibilitar a avaliação do inventário dos radionuclídeos gama emissores presentes nestas estruturas, mais particularmente daqueles a serem utilizados como radionuclídeos chaves na proposição das razões de concentração de atividade. O inventário dos radionuclídeos chaves, associado aos dados das razões de concentração de atividade de outros radionuclídeos presentes em amostras representativas dos GVs e da TVR, possibilitará a proposição de um inventário radioisotópico estendido dessas estruturas. Este documento apresenta também a medida de mapeamento dosimétrico dos GVs. Essa atividade visa a apresentação de informações complementares àquelas disponibilizadas pela atividade de espectrometria gama na avaliação do inventário dos radionuclídeos gama emissores. A apresentação deste documento atende o item 8.4.2 do Plano de Trabalho, que inclui a "Realização e apresentação dos resultados de espectrometria gama dos Geradores de Vapor e da Tampa do Vaso do Reator" do Acordo de Pesquisa e Desenvolvimento (Ativo Isotópico - Fase B) ,celebrado entre a Eletronuclear (ETN) e o Instituto de Pesquisas Energéticas e Nucleares (IPEN-CNEN/SP).