Navegação por autor "ZAGATTO, V.A.B."

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  • IPEN-DOC 28520

    LA FAUCI, L.; SPATAFORA, A.; CAPPUZZELLO, F.; AGODI, C.; CARBONE, D.; CAVALLARO, M.; LUBIAN, J.; ACOSTA, L.; AMADOR-VALENZUELA, P.; BORELLO-LEWIN, T.; BRISCHETTO, G.A.; CALABRESE, S.; CALVO, D.; CAPIROSSI, V.; CHAVEZ LOMELI, E.R.; 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.; LINARES, R.; MA, J.; MEDINA, N.H.; MORALLES, M. ; OLIVEIRA, J.R.B.; PAKOU, A.; PANDOLA, L.; PETRASCU, H.; PINNA, F.; RIES, P.C.; RUSSO, G.; SGOUROS, O.; SOLAKCI, S.O.; SOUKERAS, V.; SOULIOTIS, G.; TORRESI, D.; TUDISCO, S.; WANG, J.; YANG, Y.; YILDIRIN, A.; ZAGATTO, V.A.B.. 18O+76Se elastic and inelastic scattering at 275 MeV. Physical Review C, v. 104, n. 5, p. 054610-1 - 054610-9, 2021. DOI: 10.1103/PhysRevC.104.054610

    Abstract: Background: An accurate description of the initial and final state interactions in the 18O+76Se collision is demanded by the NUMEN project. The study of single and double charge exchange nuclear reactions is the main purpose for NUMEN, since these can be used as tools to provide experimentally driven information about nuclear matrix elements of interest in the context of neutrinoless double-β decay. To date, the details of the optical potentials and nuclear response to isospin operators for many of the projectile-target systems proposed for the NUMEN double charge exchange studies are poorly known. The 18O+76Se case, here under study, is particularly relevant due to its connection with the 76Ge neutrinoless double-β decay. Purpose: In this work the authors want to characterize the initial-state interaction for the 18O+76Se reactions at 275 MeV incident energy determining the optical potential and evaluating the effect of couplings with the inelastic scattering on the elastic channel. Methods: The angular distributions of differential cross section were measured in the angular region between 4◦ and 22◦ in the center-of-mass reference frame. The cross sections were compared with theoretical calculations, that adopt different optical potentials. Coupling effects on the elastic channel were determined into the coupled channels formalism. Results: The excitation energy spectrum of the colliding nuclei and the cross section angular distributions were measured with satisfactory energy resolution. The elastic scattering cross section is not well reproduced in the full angular range explored when the optical model approach is adopted. A good agreement is found using coupled channel calculations. The initial state interaction for the 18O+76Se nuclear reactions at 275 MeV is determined. Conclusions: Coupled channels effects are crucial to obtain a good description of the measured elastic and inelastic channels cross sections, even at large transferred momenta where the optical model approach fails in reproducing the experimental data. The role of channel coupling could be relevant also in the analysis of other open reaction channels in the same collision and should be accounted for in double charge exchange analyses as well.

    Palavras-Chave: oxygen 18; selenium 76; elastic scattering; inelastic scattering; nuclear reactions

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  • IPEN-DOC 28521

    CALABRESE, S.; CAVALLARO, M.; CARBONE, D.; CAPPUZZELLO, F.; AGODI, C.; BURRELLO, S.; DE GREGORIO, G.; FERREIRA, J.L.; GARGANO, A.; SGOUROS, O.; ACOSTA, L.; AMADOR-VALENZUELA, P.; BELLONE, J.I.; BORELLO-LEWIN, T.; BRISCHETTO, G.A.; CALVO, D.; CAPIROSSI, V.; CHAVEZ LOMELI, E.R.; CIRALDO, I.; COLONNA, 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.; 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.; SPATAFORA, A.; TORRESI, D.; TUDISCO, S.; YILDIRIN, A.; ZAGATTO, V.A.B.. 18O-induced single-nucleon transfer reactions on 40Ca at 15.3A MeV within a multichannel analysis. Physical Review C, v. 104, n. 6, p. 064609-1 - 064609-12, 2021. DOI: 10.1103/PhysRevC.104.064609

    Abstract: Background: Nucleon transfer reactions are selective tools for nuclear physics investigations. The theoretical and computational limits affecting in the past their data analysis could be nowadays surmounted thanks to the advent of methods with refined approximations and constraints, even when heavy-ion collisions are considered. Purpose: Modern microscopic calculations of heavy-ion-induced transfer reactions combined with precise experimental data offer the chance for accurately testing different reaction models as well as the nuclear structure description of the involved nuclear states. Method: Single proton and neutron transfer reactions were measured with theMAGNEX magnetic spectrometer for the 18O+40Ca system at 15.3A MeV. Excitation energy spectra and angular differential cross section distributions were extracted. The experimental results are compared with theoretical calculations performed in distorted wave and coupled channel Born approximation. The use of a coupled channel equivalent polarization potential to effectively describe the coupling effects affecting the initial state interaction is also considered. Spectroscopic amplitudes derived from a large-scale shell model with appropriate interactions adapted for the involved nuclei are employed. Results: Our theoretical calculations are in good agreement with experimental data, without the need for any scaling factor, validating the adopted reaction and nuclear structure parameters. Moreover, under the present experimental conditions, a weak dependence of the obtained results on the choice of the reaction models was observed. Conclusions: The good agreement between experimental and theoretical results validates the reliability of the parameter sets entering the calculations. They are extracted from or tested in complementary analyses of other reaction channels under the same experimental conditions. Such a multichannel approach represents the best option to pursue a solid, comprehensive, and model-independent description of the single-nucleon transfer reactions. The successful description of the present one-nucleon transfer data is also propaedeutic to the accurate assessment, under the same theoretical description, of higher-order transfer processes, like the sequential nucleon transfer mechanisms which are in competition with the direct charge exchange reactions.

    Palavras-Chave: nucleon reactions; calcium 40; oxygen 18; calculation methods; born approximation; distorted wave theory; magnets

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  • IPEN-DOC 26477

    SPATAFORA, A.; CAPPUZZELLO, F.; CARBONE, D.; CAVALLARO, M.; LAY, J.A.; ACOSTA, L.; AGODI, C.; BONANNO, D.; BONGIOVANNI, D.; BOZTOSUN, I.; BRISCHETTO, G.A.; BURRELLO, S.; CALABRESE, S.; CALVO, D.; LOMELI, E.R.C.; CIRALDO, I.; COLONNA, M.; DELAUNAY, F.; DESHMUKH, N.; FERREIRA, J.L.; FINOCCHIARO, P.; FISICHELLA, M.; FOTI, A.; GALLO, G.; HACISALIHOGLU, A.; IAZZI, F.; LANZALONE, G.; LENSKE, H.; LINARES, R.; PRESTI, D.L.; LUBIAN, J.; MORALLES, M. ; MUOIO, A.; OLIVEIRA, J.R.B.; PAKOU, A.; PANDOLA, L.; PETRASCU, H.; PINNA, F.; REITO, S.; RUSSO, G.; SANTAGATI, G.; SGOUROS, O.; SOLAKCI, S.O.; SOUKERAS, V.; SOULIOTIS, G.; TORRESI, D.; TUDISCO, S.; YILDIRIM, A.; ZAGATTO, V.A.B.. 20Ne + 76Ge elastic and inelastic scattering at 306 MeV. Physical Review C, v. 100, n. 3, p. 034620-1 - 034620-8, 2019. DOI: 10.1103/PhysRevC.100.034620

    Abstract: Background: Double charge exchange (DCE) nuclear reactions have recently attracted much interest as tools to provide experimentally driven information about nuclear matrix elements of interest in the context of neutrinoless double-β decay. In this framework, a good description of the reaction mechanism and a complete knowledge of the initial and final-state interactions are mandatory. Presently, not enough is known about the details of the optical potentials and nuclear response to isospin operators for many of the projectile-target systems proposed for future DCE studies. Among these, the 20Ne + 76Ge DCE reaction is particularly relevant due to its connection with 76Ge double-β decay. Purpose: We intend to characterize the initial-state interaction for the 20Ne + 76Ge reactions at 306 MeV bombarding energy and determine the optical potential and the role of the couplings between elastic channel and inelastic transitions to the first low-lying excited states. Methods: We determine the experimental elastic and inelastic scattering cross-section angular distributions, compare the theoretical predictions by adopting different models of optical potentials with the experimental data, and evaluate the coupling effect through the comparison of the distorted-wave Born approximation calculations with the coupled channels ones. Results: Optical models fail to describe the elastic angular distribution above the grazing angle (≈9.4◦). A correction in the geometry to effectively account for deformation of the involved nuclear systems improves the agreement up to about 14◦. Coupled channels effects are crucial to obtain good agreement at large angles in the elastic scattering cross section. Conclusions: The analysis of elastic and inelastic scattering data turned out to be a powerful tool to explore the initial and final-state interactions in heavy-ion nuclear reactions at high transferred momenta.

    Palavras-Chave: neon 20; germanium 76; isotopes; charge-exchange reactions; elastic scattering; inelastic scattering; decay; scattering amplitudes

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  • IPEN-DOC 28876

    CIRALDO, I.; CAPPUZZELLO, F.; CAVALLARO, M.; CARBONE, D.; BURRELLO, S.; SPATAFORA, A.; GARGANO, A.; DE GREGORIO, G.; MAGANA VSEVOLODOVNA, R.I.; ACOSTA, L.; AGODI, C.; AMADOR-VALENZUELA, P.; BORELLO-LEWIN, T.; BRISCHETTO, G.A.; CALABRESE, S.; CALVO, D.; CAPIROSSI, V.; CHAVEZ LOMELI, E.R.; COLONNA, M.; DELAUNAY, F.; DJAPO, H.; EKE, C.; FINOCCHIARO, P.; FIRAT, S.; FISICHELLA, M.; FOTI, A.; HACISALIHOGLU, A.; IAZZI, F.; LA FAUCI, L.; LINARES, R.; MEDINA, N.H.; MORALLES, M. ; OLIVEIRA, J.R.B.; PAKOU, A.; PANDOLA, L.; PETRASCU, H.; PINNA, F.; RUSSO, G.; SANTOPINTO, E.; SGOUROS, O.; GUAZZELLI, M.A.; SOLAKCI, S.O.; SOUKERAS, V.; SOULIOTIS, G.; TORRESI, D.; TUDISCO, S.; YILDIRIM, A.; ZAGATTO, V.A.B.. Analysis of the one-neutron transfer reaction in 18O+76Se collisions at 275 MeV. Physical Review C, v. 105, n. 4, p. 044607-1 - 044607-15, 2022. DOI: 10.1103/PhysRevC.105.044607

    Abstract: Background: Heavy-ion one-nucleon transfer reactions are promising tools to investigate single-particle configurations in nuclear states with and without the excitation of the core degrees of freedom. A careful determination of the spectroscopic amplitudes of these configurations is essential for the accurate study of other direct reactions as well as β decays. In nucleon transfer reactions core excitations, for both target and projectile systems, are best approached via coupled-channels reaction schemes. Despite being notoriously demanding in terms of computing resources, coupled-channels analyses are progressively becoming more affordable even within model spaces large enough for tackling medium mass nuclei. In this context, the 76Se(18O, 17O) 77Se reaction, here under study, gives a quantitative access to the relevant single-particle orbitals and core polarization configurations built on 76Se. This is particularly relevant, since it provides data-driven information to constrain nuclear structure models for 76Se, which is the daughter nucleus in the 76Ge ββ decay. This reaction is one of the systems studied in the frame of the Nuclear Matrix Elements for Neutrinoless double beta decay project. Purpose: We want to analyze transitions to low-lying excited states of the residual and ejectile nuclei in the 76Se(18O, 17O) 77Se one-neutron stripping reaction at 275-MeV incident energy and determine the role of single-particle and core excitation in the description of the measured cross sections. In addition, we explore the sensitivity of the calculated cross section to different nuclear structure models. Methods: The excitation energy spectrum and the differential cross-section angular distributions are measured using the MAGNEX large acceptance magnetic spectrometer for the detection of the ejectiles and the missing mass technique for the reconstruction of the reaction kinematics. The data are compared with calculations based on distorted-wave Born approximation, coupled-channels Born approximation, and coupled reaction channels adopting spectroscopic amplitudes for the projectile and target overlaps derived by large-scale shell-model calculations and interacting boson-fermion model. Results: Peaks in the energy spectra corresponding to groups of unresolved transitions to 77Se and 17O are identified. The experimental cross sections are extracted and compared to theoretical calculations. A remarkable agreement is found, without using any scaling factors, demonstrating that the adopted models for nuclear structure and reaction take into account the relevant aspects of the studied processes. The main transitions which contribute to the cross section of each peak are identified. Conclusions: The coupling with the inelastic channels feeding states in entrance and exit partitions is important in the one-neutron transfer reaction and should be accounted for in future analyses of other direct reactions such as single and double charge exchange processes involving 76Se isotope. The description of 77Se indicates the need of a large model space, in the view of an accurate description of the low-lying states, a feature that should be likely accounted even for ββ-decay studies of 76Ge.

    Palavras-Chave: nuclear matrix; neutron transfer; double beta decay; oxygen 18; selenium 76

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  • IPEN-DOC 27427

    CARBONE, D.; FERREIRA, J.L.; CALABRESE, S.; CAPPUZZELLO, F.; CAVALLARO, M.; HACISALIHOGLU, A.; LENSKE, H.; LUBIAN, J.; MAGAÑA VSEVOLODOVNA, R.I.; SANTOPINTO, E.; AGODI, C.; ACOSTA, L.; BONANNO, D.; BORELLO-LEWIN, T.; BOZTOSUN, I.; BRISCHETTO, G.A.; BURRELLO, S.; CALVO, D.; CHÁVEZ LOMELÍ, E.R.; CIRALDO, I.; COLONNA, M.; DELAUNAY, F.; DESHMUKH, N.; FINOCCHIARO, P.; FISICHELLA, M.; FOTI, A.; GALLO, G.; IAZZI, F.; LA FAUCI, L.; LANZALONE, G.; LINARES, R.; MEDINA, N.H.; MORALLES, M. ; OLIVEIRA, J.R.B.; PAKOU, A.; PANDOLA, L.; PETRASCU, H.; PINNA, F.; REITO, S.; RUSSO, G.; SGOUROS, O.; SOLAKCI, S.O.; SOUKERAS, V.; SOULIOTIS, G.; SPATAFORA, A.; TORRESI, D.; TUDISCO, S.; YILDIRIN, A.; ZAGATTO, V.A.B.. Analysis of two-nucleon transfer reactions in the 20Ne+116Cd system at 306 MeV. Physical Review C, v. 102, n. 4, p. 044606-1 - 044606-14, 2020. DOI: 10.1103/PhysRevC.102.044606

    Abstract: Background: Heavy-ion induced two-nucleon transfer reactions are powerful tools to reveal peculiar aspects of the atomic nucleus, such as pairing correlations, single-particle and collective degrees of freedom, and more. Also, these processes are in competition with the direct meson exchange in the double charge exchange reactions, which have recently attracted great interest due to their possible connection to neutrinoless double-β decay. In this framework, the exploration of two-nucleon transfer reactions in the 20Ne+116Cd collision at energies above the Coulomb barrier is particularly relevant since the 116Cd nucleus is a candidate for the double-β decay. Purpose: We want to analyze selected transitions to low-lying 0+ and 2+ states of the residual nuclei in the 116Cd(20Ne, 22Ne)114Cd two-neutron pickup and 116Cd(20Ne, 18O)118Sn two-proton stripping reactions at 306 MeV incident energy and determine the role of the couplings with inelastic transitions. Methods: We measured the excitation energy spectra and absolute cross sections for the two reactions using the MAGNEX large acceptance magnetic spectrometer to detect the ejectiles. We performed direct coupled reaction channels and sequential distorted wave Born approximation calculations using the double folding São Paulo potential to model the initial and final state interactions. The spectroscopic amplitudes for two- and singleparticle transitions were derived by different nuclear structure approaches: microscopic large-scale shell model, interacting boson model-2 and quasiparticle random phase approximation. Results: The calculations are able to reproduce the experimental cross sections for both two-neutron and twoproton transfer reactions. The role of couplings with the inelastic channels are found to be important in the two-proton transfer case. A competition between the direct and the sequential process is found in the reaction mechanism. For the two-proton transfer case, the inclusion of the 1g7/2 and 2d5/2 orbitals in the model space is crucial. Conclusions: The approach presented here, combination of nuclear structure and reaction mechanism ingredients, is a very promising tool for the analysis of two-neutron and two-proton transfer reactions between heavy nuclei.

    Palavras-Chave: two-nucleon transfer reactions; rare gases; multi-nucleon transfer reactions; neon 20; cadmium 116

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  • 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

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  • IPEN-DOC 22384

    ZAGATTO, V.A.B.; OLIVEIRA, J.R.B.; GASQUES, L.R.; ALCANTARA NUNEZ, J.A.; DUARTE, J.G.; AGUIAR, V.P.; MEDINA, N.H.; SEALE, W.A.; PIRES, K.C.C.; FREITAS, A.; LUBIAN, J.; SHORTO, J.M.B. ; GENEZINI, F.A. ; ROSSI JUNIOR, E.S.. Elastic and inelastic angular distributions of the sup(7)Li+sup(120)Sn system for energies near the Coulomb barrier. Journal of Physics G: Nuclear and Particle Physics, v. 43, p. 055103-1 - 055103-13, 2016.

    Observação: Corrigendum anexado. Journal of Physics G: Nuclear and Particle Physics, v. 44, p. 1-2, 2017. DOI: 10.1088/1361-6471/aa6c6c

    Palavras-Chave: inelastic scattering; x-ray spectrometers; angular distribution; lithium 7; tin 120; barriers; comparative evaluations; coupled channel theory

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  • IPEN-DOC 23216

    ZAGATTO, V.A.B.; LUBIAN, J.; GASQUES, L.R.; ALVAREZ, M.A.G.; CHAMON, L.C.; OLIVEIRA, J.R.B.; ALCANTARA-NUNEZ, J.A.; MEDINA, N.H.; SCARDUELLI, V.; FREITAS, A.; PADRON, I.; ROSSI JUNIOR, E.S.; SHORTO, J.M.B. . Elastic scattering, inelastic excitation, and neutron transfer for 7Li + 120Sn at energies around the Coulomb barrier. Physical Review C, v. 95, n. 6, p. 064614-1 - 064614-8, 2017. DOI: 10.1103/PhysRevC.95.064614

    Abstract: Experimental angular distributions for the Li-7 + Sn-120 elastic and inelastic (projectile and target excitations) scattering, and for the neutron stripping reaction, have been obtained at E-LAB = 20, 22, 24, and 26 MeV, covering an energy range around the Coulomb barrier (V-B((LAB)) approximate to 21.4 MeV). Coupled channel and coupled reaction channel calculations were performed and both describe satisfactorily the experimental data sets. The 1/2(-) state Li-7 inelastic excitation (using a rotational model), as well as the projectile coupling to the continuum (alpha plus a tritium particle) play a fundamental role on the proper description of elastic, inelastic, and transfer channels. Couplings to the one-neutron stripping channel do not significantly affect the theoretical elastic scattering angular distributions. The spectroscopic amplitudes of the transfer channel were obtained through a shell model calculation. The theoretical angular distributions for the one-neutron stripping reaction agreed with the experimental data.

    Palavras-Chave: scattering; elastic scattering; data analysis; lithium 7 reactions; tin 120 target; coulomb field

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  • IPEN-DOC 28169

    SANTOS, O.C.B.; LICHTENTHALER, R.; PIRES, K.C.C.; UMBELINO, U.; ZEVALLOS, E.O.N.; LARA, A.L. de; SERRA, A.S.; SCARDUELLI, V.; ALCANTARA-NUNEZ, J.; GUIMARAES, V.; LEPINE-SZILY, A.; ZAMORA, J.C.; MORO, A.M.; APPANNABABU, S.; ASSUNCAO, M.; BARIONI, A.; LINARES, R.; ZAGATTO, V.A.B.; FARIA, P.N. de; MORAIS, M.C.; MORCELLE, V.; SHORTO, J.M.B. ; LEI, JIN. Evidence of the effect of strong stripping channels on the dynamics of the 8Li+58Ni reaction. Physical Review C, v. 103, n. 6, p. 064601-1 - 064601-10, 2021. DOI: 10.1103/PhysRevC.103.064601

    Abstract: The 8Li+58Ni collision is investigated at 23.9, 26.1, 28.7, and 30 MeV bombarding energies. Quasielastic angular distributions and the singles 7Li angular and energy distributions are presented. Coupled-reaction channels (CRC) calculations, which include the coupling of the elastic channel to 59Ni = 58Ni +n states above and below the neutron threshold, provide a simultaneous description of the quasielastic and transfer distributions and evidence the strong effect of the one-neutron transfer/breakup channels on the quasielastic scattering. The 7Li angular and energy distributions have been also successfully analyzed combining the continuum discretized coupled channels (CDCC) method, for the elastic breakup, and the IAV model of Ichimura, Austern, and Vincent [Phys. Rev. C 32, 431 (1985)], for the nonelastic breakup. These calculations indicate that most of the 7Li yields are due to nonelastic breakup contributions (transfer), whereas elastic breakup plays a minor role.

    Palavras-Chave: lithium 8 reactions; nickel 58 reactions; stripping; coupled channel theory; lithium 7

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  • IPEN-DOC 27138

    OLIVEIRA, J.R.B.; MORALLES, M. ; FLECHAS, D.; CARBONE, D.; CAVALLARO, M.; TORRESI, D.; ACOSTA, L.; AGODI, C.; AMADOR-VALENZUELA, P.; BONANNO, D.; BORELLO-LEWIN, T.; BRISCHETTO, G.A.; CALABRESE, S.; CALVO, D.; CAPIROSSI, V.; CAPPUZZELLO, F.; CHAVEZ-LOMELÍ, E.R.; CIRALDO, I.; DELAUNAY, F.; DJAPO, H.; EKE, C.; FINOCCHIARO, P.; FIRAT, S.; FISICHELLA, M.; FOTI, A.; GALLO, G.; GUAZZELLI, M.A.; HACISALIHOGLU, A.; IAZZI, F.; LINARES, R.; LO PRESTI, D.; MA, J.; MEDINA, N.H.; PAKOU, A.; PANDOLA, L.; PETRASCU, H.; PINNA, F.; REITO, S.; RIES, P.; RUSSO, G.; SGOUROS, O.; SOLAKCI, S.O.; SOUKERAS, V.; SOULIOTIS, G.; SPATAFORA, A.; TUDISCO, S.; WANG, J.S.; YANG, Y.Y.; YILDIRIM, A.; ZAGATTO, V.A.B.. First comparison of GEANT4 hadrontherapy physics model with experimental data for a NUMEN project reaction case. European Physical Journal A, v. 56, n. 5, p. 1-9, 2020. DOI: 10.1140/epja/s10050-020-00152-6

    Abstract: Gamma-ray and neutron spectra from the 18O +76Se reaction at 15.3 MeV/u were measured with the EDEN array of liquid scintillators at the LNS. The results were compared to GEANT Hadrontherapy physics list simulations in order to assess the reliability of this model for the development of theNUMENproject.Agood agreement with the shape of the experimental gamma-ray spectra and a reasonable agreement with the total count rates were obtained. The gamma spectra originated from the nuclear reactions were selected by time coincidence with the Superconducting Cyclotron radio-frequency reference signal. The random coincidence background rate was appropriately described only when the Faraday Cup, the material and geometry of the experimental hall and its contents were included in the simulationwith sufficient detail. The information on the radiation spectra is important for the adequate development of the project of the detector arrays and electronic equipment for the advanced phase of NUMEN. Since orders of magnitude larger beam intensities are planned for this phase, the random coincidence rate is also of significant importance, particularly for the performance of the G-NUMEN gamma calorimeter array.

    Palavras-Chave: angular distribution; beam monitoring; coincidence spectrometry; computerized simulation; counting rates; energy spectra; external beam radiation therapy; faraday cups; g codes; gamma radiation; mev range 100-1000; neutron spectra; oxygen 18 beams; selenium 76 target

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  • IPEN-DOC 29067

    CAVALLARO, M.; AGODI, C.; BELLONE, J.I.; BRASOLIN, S.; BRISCHETTO, G.A.; BUSSA, M.P.; CALABRESE, S.; CALVO, D.; CAMPAJOLA, L.; CAPIROSSI, V.; CAPPUZZELLO, F.; CARBONE, D.; CIRALDO, I.; COLONNA, M.; DE BENEDICTIS, C.; DE GREGORIO, G.; DELAUNAY, F.; DUMITRACHE, F.; FERRARESI, C.; FINOCCHIARO, P.; FISICHELLA, M.; GALLIAN, S.; GAMBACURTA, D.; GANDOLFO, E.M.; GARGANO, A.; GIOVANNINI, M.; IAZZI, F.; LANZALONE, G.; LAVAGNO, A.; MEREU, P.; NERI, L.; PANDOLA, L.; PANERO, R.; PERSIANI, R.; PINNA, F.; RUSSO, A.D.; RUSSO, G.; SANTOPINTO, E.; SARTIRANA, D.; SGOUROS, O.; SHARMA, V.R.; SOUKERAS, V.; SPATAFORA, A.; TORRESI, D.; TUDISCO, S.; AVANZI, L.H.; CARDOZO, E.N.; CHINAGLIA, E.F.; COSTA, K.M.; FERREIRA, J.L.; LINARES, R.; LUBIAN, J.; MASUNAGA, S.H.; MEDINA, N.H.; MORALLES, M. ; OLIVEIRA, J.R.B.; SANTARELLI, T.M.; SANTOS, R.B.B.; GUAZZELLI, M.A.; ZAGATTO, V.A.B.; KOULOURIS, S.; PAKOU, A.; SOULIOTIS, G.; ACOSTA, L.; AMADOR-VALENZUELA, P.; BIJKER, R.; CHAVEZ LOMELI, E.R.; GARCIA-TECOCOATZI, H.; HUERTA HERNANDEZ, A.; MARIN-LAMBARRI, D.J.; VARGAS HERNANDEZ, H.; VILLAGRAN, R.G.; BOZTOSUN, I.; DAPO, H.; EKE, C.; FIRAT, S.; HACISALIHOGLU, A.; KUCUK, Y.; SOLAKCI, S.O.; YILDIRIM, A.; AUERBACH, N.; BURRELLO, S.; LENSKE, H.; ISAAK, J.; PIETRALLA, N.; WERNER, V.; LAY, J.A.; PETRASCU, H.; FERRETTI, J.; KOTILA, J.; DONALDSON, L.M.; KHUMALO, T.; NEVELING, R.; PELLEGRI, L.. A focus on selected perspectives of the NUMEN project. Journal of Physics: Conference Series, v. 2340, p. 1-8, 2022. DOI: 10.1088/1742-6596/2340/1/012036

    Abstract: The use of 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 strategy adopted in the experimental campaigns performed at INFN - Laboratori Nazionali del Sud and in the analysis methods within the NUMEN project is briefly described, emphasizing the advantages of the multi-channel approach to nuclear reaction data analysis. An overview on the research and development activities on the MAGNEX magnetic spectrometer is also given, with a focus on the chosen technological solutions for the focal plane detector which will guarantee the performances at high-rate conditions.

    Palavras-Chave: matrix elements; nuclear matrix; charge exchange; neutrinos

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  • IPEN-DOC 20037

    ZAGATTO, V.A.B.; OLIVEIRA, J.R.B.; ALLEGRO, P.R.P.; CHAMON, L.C.; CYBULSKA, E.W.; MEDINA, N.H.; RIBAS, R.V.; SEALE, W.A.; SILVA, C.P.; GASQUES, L.R.; ZAHN, G.S. ; GENEZINI, F.A. ; SHORTO, J.M.B. ; LUBIAN, J.; LINARES, R.; TOUFEN, D.L.; SILVEIRA, M.A.G.; ROSSI JUNIOR, E.S.; NOBRE, G.P.. Gamma-particle coincidence technique for the study of nuclear reactions. Nuclear Instruments and Methods in Physics Research, v. 749, Section A, p. 19-26, 2014.

    Palavras-Chave: nuclear reactions; coincidence methods; particles; gamma sources; gamma spectrometers; inelastic scattering; palladium 110

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  • IPEN-DOC 20876

    DUARTE, J.G.; GASQUES, L.R.; OLIVEIRA, J.R.B.; ZAGATTO, V.A.B.; CHAMON, L.C.; MEDINA, N.H.; ADDED, N.; SEALE, W.A.; ALCANTARA NUNEZ, J.A.; ROSSI JUNIOR, E.S.; AMADOR VALENZUELA, P.; LEPINE SZILY, A.; FREITAS, A.S.; SCARDUELLI, V.; AGUIAR, V.A.P.; SHORTO, J.M.B. . Measurement of fusion cross sections for sup(16)O+sup(16)(O). Journal of Physics G: Nuclear and Particle Physics, v. 42, n. 6, p. 065102-1 - 065102-10, 2015.

    Palavras-Chave: heavy ion fusion reactions; mev range 01-10; mev range 10-100; oxygen 16 reactions; mev range; thermonuclear reactions; total cross sections; cross sections; gamma spectroscopy; oxygen 16 target

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  • IPEN-DOC 29625

    SPATAFORA, A.; CARBONE, D.; CAPPUZZELLO, F.; CAVALLARO, M.; ACOSTA, L.; AGODI, C.; AMADOR-VALENZUELA, P.; BORELLO-LEWIN, T.; BRISCHETTO, G.A.; CALABRESE, S.; CALVO, D.; CAPIROSSI, V.; CHAVEZ LOMELI, E.R.; CIRALDO, I.; DE GREGORIO, G.; DELAUNAY, F.; DJAPO, H.; EKE, C.; FINOCCHIARO, P.; FIRAT, S.; FISICHELLA, M.; FOTI, A.; GARGANO, A.; HACISALIHOGLU, A.; IAZZI, F.; LA FAUCI, L.; LINARES, R.; LUBIAN, J.; MEDINA, N. ; MORALLES, M. ; OLIVEIRA, J.R.B.; PAKOU, A.; PANDOLA, L.; PETRASCU, H.; PINNA, F.; RUSSO, G.; SGOUROS, O.; SILVEIRA, M.A.G. da; SOLAKCI, S.O.; SOUKERAS, V.; SOULIOTIS, G.; TORRESI, D.; TUDISCO, S.; YILDIRIM, A.; ZAGATTO, V.A.B.. Multichannel experimental and theoretical approach to the 12C(18O, 18F)12B single-charge-exchange reaction at 275 MeV: initial-state interaction and single-particle properties of nuclear wave functions. Physical Review C, v. 107, n. 2, p. 024605-1 - 024605-19, 2023. DOI: 10.1103/PhysRevC.107.024605

    Abstract: Background: Single-charge-exchange reactions are appropriate tools to study the nuclear response to one-particle/one-hole isospin probes, gaining additional interest from the connection to beta decay. This analogy has been recently extended to second order, connecting double-charge-exchange reactions and double beta decays. Nowadays, the availability of powerful experimental setups and advanced nuclear theories and models allows one to access precious information on key nuclear structure aspects embedded in the widely sought neutrinoless double beta decay. Purpose: We intend to bring to light the main nuclear structure and reaction features involved in the 18O+12C collision at 275 MeV incident energy. In this paper, the main focus is on the role of the initial- and final-state interactions in the overall reaction dynamics and on the single-particle nuclear structure properties accessed via the study of single-nucleon transfer reactions. Forthcoming articles will be devoted to go into the details of the response to one- and two-particle/hole isospin probes. Methods: Cross-section energy spectra and angular distributions were measured in a unique experimental setup for the 12C(18O, 18O)12C elastic and inelastic scattering, the 12C(18O, 17O)13C one-neutron stripping, the 12C(18O, 19F)11B one-proton pickup, and the 12C(18O, 18F)12B single-charge-exchange nuclear reactions. A unique comprehensive and coherent theoretical calculation, able to describe the whole network of direct reactions using state-of-the-art nuclear structure and reaction theories, was performed, and it is presented for the first time in this article. This holistic approach, applied both to the experimental and theoretical analysis, is the main feature and worth of the work here presented. Results: The energy and angular resolutions achieved in each reaction channel allowed us to isolate specific transitions and to map the diffraction patterns in the angular distributions. The cross-section calculations describe well the experimental data, both in terms of the absolute values and diffraction patterns. Although the distorted wave Born approximation (DWBA) calculations prove to be accurate in describing all the studied channels, better results are achieved when the couplings to inelastic transitions in both the incoming and outgoing partitions are introduced, as done in the coupled channels Born approximation (CCBA) calculations. Otherwise, no real improvement is found when the coupling effects among different partitions are explicitly taken into account in the coupled reaction channels (CRC) calculations. Conclusions: The multichannel approach proposed in this paper is a promising method for accurate investigations of direct reactions originating in heavy-ion collisions. This is quite appealing for the precise spectroscopy of heavy nuclei proposed in many areas of nuclear physics. An example is the NUMEN project with its challenging commitment to provide valuable information on neutrinoless double beta decay nuclear matrix elements from single- and double-charge-exchange cross-section measurements.

    Palavras-Chave: nuclear matrix; charge-exchange reactions; excitation; wave functions; multi-channel analyzers

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  • IPEN-DOC 28877

    BURRELLO, S.; CALABRESE, S.; CAPPUZZELLO, F.; CARBONE, D.; CAVALLARO, M.; COLONNA, M.; LAY, J.A.; LENSKE, H.; AGODI, C.; FERREIRA, J.L.; FIRAT, S.; HACISALIHOGLU, A.; LA FAUCI, L.; SPATAFORA, A.; ACOSTA, L.; BELLONE, J.I.; BORELLO-LEWIN, T.; BOZTOSUN, I.; BRISCHETTO, G.A.; CALVO, D.; CHAVEZ LOMELI, E.R.; CIRALDO, I.; CUTULI, M.; DELAUNAY, F.; FINOCCHIARO, P.; FISICHELLA, M.; FOTI, A.; IAZZI, F.; LANZALONE, G.; LINARES, R.; LUBIAN, J.; MORALLES, M. ; OLIVEIRA, J.R.B.; PAKOU, A.; PANDOLA, L.; PETRASCU, H.; PINNA, F.; RUSSO, G.; SGOUROS, O.; SOLAKCI, S.O.; SOUKERAS, V.; SOULIOTIS, G.; TORRESI, D.; TUDISCO, S.; YILDIRIM, A.; ZAGATTO, V.A.B.. Multichannel experimental and theoretical constraints for the 116Cd(20Ne, 20F) 116In charge exchange reaction at 306 MeV. Physical Review C, v. 105, n. 2, p. 024616-1 - 024616-20, 2022. DOI: 10.1103/PhysRevC.105.024616

    Abstract: Background: Charge-exchange (CE) reactions offer a major opportunity to excite nuclear isovector modes, providing important clues about the nuclear interaction in the medium. Moreover, double charge-exchange reactions are proving to be a tempting tool to access nuclear transition matrix elements (NMEs) related to double beta-decay processes. The latter are also of crucial importance to extract neutrino properties from the half-life of the hypothetical neutrinoless double beta decay and to search for physics beyond the standard model. Purpose: Through a multichannel experimental analysis and a consistent theoretical approach of the 116Cd(20Ne, 20F) 116In single charge-exchange (SCE) reaction at 306 MeV, we aim at disentangling from the experimental cross section the contribution of the competing mechanisms associated with second- or higherorder sequential transfer and/or inelastic processes. Methods: We measured excitation energy spectra and absolute cross sections for elastic + inelastic, one-proton transfer and SCE channels by using the MAGNEX large acceptance magnetic spectrometer to detect the ejectiles. For the first two channels, we also extracted the experimental cross-section angular distributions. The experimental data are compared with theoretical predictions obtained by performing two-step distortedwave Born approximation and coupled reaction channel calculations. We employ spectroscopic amplitudes for single-particle transitions derived within a large-scale shell-model approach and different optical potentials for modeling the initial- and the final-state interactions. Results: The present study significantly mitigates the possible model dependence existing in the description of these complex reaction mechanisms thanks to the satisfactory reproduction of several channels at once. In particular, our work demonstrates that the two-step transfer mechanisms produce a non-negligible contribution to the total cross section of the 116Cd(20Ne, 20F) 116In reaction channel, although a relevant fraction is still missing, being ascribable to the direct SCE mechanism, which is not addressed here. Conclusions: Our analysis provides a careful estimation of the sequential transfer processes which are competing with the direct SCE mechanism for the heavy ion reaction under investigation. The study suggests that the direct SCE should play an important role among the mechanisms populating the final channel. Nevertheless, the analysis of the higher-order processes considered here is mandatory to isolate the direct SCE process contribution and approach structure information on the corresponding NME from the reaction cross section. The description of the latter process and the competition between the two mechanisms deserves further investigation.

    Palavras-Chave: charge exchange; nuclear reactions; nuclear matrix; beta decay; cadmium 116

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  • IPEN-DOC 27939

    AGODI, C.; CAPPUZZELLO, F.; ACOSTA, L.; AMADOR-VALENZUELA, P.; AUERBACH, N.; BAREA, J.; BELLONE, J.I.; BELMONT, D.; 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.; CHEN, R.; CIRALDO, I.; CHAVEZ LOMELI, E.R.; COLONNA, M.; D’AGOSTINO, G.; DJAPO, H.; DE GERONIMO, G.; DELAUNAY, F.; DESHMUKH, N.; DE FARIA, P.N.; ESPEJEL, R.; FERRARESI, C.; FERREIRA, J.L.; FERRETTI, J.; FINOCCHIARO, P.; FIRAT, S.; FISICHELLA, M.; FLORES, A.; FOTI, A.; GALLO, G.; GARCIA-TECOCOATZI, H.; GONGORA, B.; HACISALIHOGLU, A.; HAZAR, S.; HUERTA, A.; KOTILA, J.; KUCUK, Y.; IAZZI, F.; LANZALONE, G.; LA VIA, F.; LAY, J.A.; LENSKE, H.; LINARES, R.; LONGHITANO, F.; LO PRESTI, D.; LUBIAN, J.; MA, J.; MARIN-LAMBARRI, D.; MARTINEZ, S.; MAS, J.; MEDINA, N.H.; MENDES, D.R.; MEREU, P.; MORALLES, M. ; OLIVEIRA, J.R.B.; ORDOÑEZ, C.; PAKOU, A.; PANDOLA, L.; PETRASCU, H.; PIETRALLA, N.; PINNA, F.; REITO, S.; REZA, G.; RIES, P.; RIFUGGIATO, D.; RODRIGUES, M.R.D.; RUSSO, A.D.; RUSSO, G.; SANDOVAL, S.; SANTOPINTO, E.; SANTOS, R.B.B.; SGOUROS, O.; SILVEIRA, M.A.G. da; SOLAKCI, S.O.; SOULIOTIS, G.; SOUKERAS, V.; SPATAFORA, A.; TORRESI, D.; TUDISCO, S.; VSEVOLODOVNA, R.I.M.; VARGAS, H.; VEGA, G.; WANG, J.S.; WERNER, V.; YANG, Y.Y.; YILDIRIN, A.; ZAGATTO, V.A.B.. New experimental campaign of NUMEN project. In: MARUYAMA, REINA (Ed.) SYMMETRIES AND ORDER: ALGEBRAIC METHODS IN MANY BODY SYSTEMS, October 5-6, 2018, Connecticut, USA. Proceedings... Melville, NY, USA: AIP Publishing, 2019. p. 30001-1 - 30001-6. (AIP Conference Proceedings, 2150). DOI: 10.1063/1.5124590

    Abstract: The NUMEN main goal is the extraction from measured cross-sections of “data-driven” information on Nuclear Matrix Elements for all the systems candidate for 0νββ. The idea is to use as experimental tool Heavy Ions –Double Charge Exchange (HI-DCE) reactions. Crucial for the experimental challanges is the INFN Laboratori Nazionali del Sud (LNS) facility, made by the Superconducting Cyclotron (CS) and the MAGNEX magnetic spectrometer. The experimental measurements of HI-DCE reactions present a number of challenging aspects, since they are characterized by very low cross sections. Here it is reported the new experimental campaign of NUMEN Project.

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

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  • IPEN-DOC 27350

    AGODI, C.; CAPPUZZELLO, F.; ACOSTA, L.; AMADOR-VALENZUELA, P.; AUERBACH, N.; BAREA, J.; SILVEIRA, M.A.G. da; BELLONE, J.; BELMONT, D.; 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.; CHAVEZ LOMELI, E.R.; CHEN, R.; CIRALDO, I.; COLONNA, M.; D’AGOSTINO, G.; DE FARIA, P.N.; DE GERONIMO, G.; DEHSMUKH, N.; DELAUNAY, F.; DJAPO, H.; ESPEJEL, R.; FERRARESI, C.; FERREIRA, J.L.; FERRETTI, J.; FINOCCHIARO, P.; FIRAT, S.; FISICHELLA, M.; FLORES, A.; FOTI, A.; GALLO, G.; GARCIA-TECOCOATZI, H.; GONGORA, B.; HACISALIHOGLU, A.; HAZAR, S.; HUERTA, A.; IAZZI, F.; KOTILA, J.; KUCUK, Y.; LA VIA, F.; LANZALONE, G.; LAY, J.A.; LENSKE, H.; LINARES, R.; LO PRESTI, D.; LONGHITANO, F.; LUBIAN, J.; MA, J.; MARIN-LAMBARRI, D.; MARTINEZ, S.; MAS, J.; MEDINA, N.; MENDES, D.R.; MEREU, P.; MORALLES, M. ; OLIVEIRA, J.R.B.; ORDONEZ, C.; PAKOU, A.; PANDOLA, L.; PETRASCU, H.; PIETRALLA, N.; PINNA, F.; REITO, S.; REZA, G.; RIES, P.; RIFUGGIATO, D.; RODRIGUES, M.; RUSSO, G.; RUSSO, A.D.; SANDOVAL, S.; SANTOPINTO, E.; SANTOS, R.B.B.; SCALTRITO, L.; SGOUROS, O.; SOLAKCI, S.O.; SOUKERAS, V.; SOULIOTIS, G.; SPATAFORA, A.; TUDISCO, S.; VARGAS, H.; VEGA, G.; VEGA, G.; WANG, J.S.; WERNER, V.; YANG, Y.Y.; YILDRIN, A.; ZAGATTO, V.A.B.. New results from the NUMEN project. In: MARRONE, ANTONIO (Ed.); MIRIZZI, ALESSANDRO (Ed.); MONTANINO, DANIELE (Ed.) NEUTRINO OSCILLATION WORKSHOP, September 9-16, 2018, Ostuni, Brindisi, Italy. Resumo expandido... Trieste, Italy: Proceedings of Science, 2018. p. 1-5.

    Abstract: The idea of NUMEN project is to study heavy-ion induced Double Charge Exchange (DCE) reactions with the aim to get information on the nuclear matrix elements for neutrinoless double beta (0nbb) decay. To infer the neutrino average masses from the possible measurement of the halflife of 0nbb decay, the knowledge of the nuclear matrix elements is crucial. DCE reactions and 0nbb decay present some similarities, the initial and final-state wave functions are the same and the transition operators are similar. The experimental measurements of DCE reactions induced by heavy ions present a number of challenging aspects, since they are characterized by very low cross sections.

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  • IPEN-DOC 25126

    OLIVEIRA, J.R.B.; FINOCCHIARO, P.; AGODI, C.; BOZTOSUN, I.; CAPPUZZELLO, F.; FARIA, P.N. de; GASQUES, L.; LINARES, R.; MEDINA, N.H.; MENDES, D.R.; MORALLES, M. ; SOLACKI, S.O.; ZAGATTO, V.A.B.; ALCANTARA-NUNEZ, J.A.; GONZALEZ-ALVAREZ, M.A.; AGUIAR, V.A.P.; ESCUDEIRO, R.; KURMAN, V.. New spectrometer projects for challenging particle-gamma measurements of nuclear reactions. Journal of Physics: Conference Series, v. 1056, 2018. DOI: 10.1088/1742-6596/1056/1/012040

    Abstract: Two new gamma spectrometer projects are under development, both with some challenging technical characteristics in common, one for the investigation of weakly bound nuclear beam reactions at near barrier energies, and the other for the measurement of double charge exchange reactions in the 15-70 MeV per nucleon range. The first one is being developed and tested at the IFUSP, and the other is going to be built and installed at the LNS, INFN, under the NUMEN collaboration. The main characteristics of the two projects are presented and discussed.

    Palavras-Chave: gamma radiation; gamma spectrometers; gamma spectra; measuring methods; radiation sources; gamma detection; beams

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  • IPEN-DOC 28170

    SGOUROS, O.; CAVALLARO, M.; CAPPUZZELLO, F.; CARBONE, D.; AGODI, C.; GARGANO, A.; DE GREGORIO, G.; ALTANA, C.; BRISCHETTO, G.A.; BURRELLO, S.; CALABRESE, S.; CALVO, D.; CAPIROSSI, V.; CHAVEZ LOMELI, E.R.; CIRALDO, I.; CUTULI, M.; DELAUNAY, F.; DJAPO, H.; EKE, C.; FINOCCHIARO, P.; FISICHELLA, M.; FOTI, 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.. One-proton transfer reaction for the 18O+48Ti system at 275 MeV. Physical Review C, v. 104, n. 3, p. 034617-1 - 034617-12, 2021. DOI: 10.1103/PhysRevC.104.034617

    Abstract: Single-nucleon transfer reactions are processes that selectively probe single-particle components of the populated many-body nuclear states. In this context, recent efforts have been made to build a unified description of the rich nuclear spectroscopy accessible in heavy-ion collisions. An example of this multichannel approach is the study of the competition between successive nucleon transfer and charge exchange reactions, the latter being of particular interest in the context of single and double beta decay studies. To this extent, the one-proton pickup reaction 48Ti(18O, 19F) 47Sc at 275 MeV was measured for the first time, under the NUMEN experimental campaign. Differential cross-section angular distribution measurements for the 19F ejectiles were performed at INFN-LNS in Catania by using the MAGNEX large acceptance magnetic spectrometer. The data were analyzed within the distorted-wave and coupled-channels Born approximation frameworks. The initial and final-state interactions were described adopting the São Paulo potential, whereas the spectroscopic amplitudes for the projectile and target overlaps were derived from shell-model calculations. The theoretical cross sections are found to be in very good agreement with the experimental data, suggesting the validity of the optical potentials and the shell-model description of the involved nuclear states within the adopted model space.

    Palavras-Chave: matrix elements; nuclear matrix; charge-exchange reactions; double beta decay; cross sections

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  • IPEN-DOC 29511

    UMBELINO, U.; LICHTENTHALER, R.; SANTOS, O.C.B.; PIRES, K.C.C.; SERRA, A.S.; SCARDUELLI, V.; LARA, A.L. de; ZEVALLOS, E.O.N.; ZAMORA, J.C.; LEPINE-SZILY, A.; SHORTO, J.M.B. ; ASSUNCAO, M.; ZAGATTO, V.A.B.. Quasielastic scattering of light radioactive and stable projectiles on 9Be. Physical Review C, v. 106, n. 5, p. 054602-1 - 054602-15, 2022. DOI: 10.1103/PhysRevC.106.054602

    Abstract: Quasielastic scattering angular distributions of radioactive (8Li, 7,10Be, and 8,12B) and stable (6,7Li, 9Be, and 11B) projectiles on a 9Be target are presented. The angular distributions have been analyzed by the optical model using Woods-Saxon form factor and São Paulo potential. Total reaction cross sections have been obtained from the optical model analysis and a comparison between different systems is presented. Coupled channels (CC), coupled reaction channels (CRC), and continuum-discretized coupled channels (CDCC) calculations have been performed to investigate the effect of the cluster configuration in the projectile inelastic excitation, breakup, and stripping reactions on the quasielastic angular distributions.

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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.