Navegação Periódicos - Artigos por autor "ZAGATTO, V.A.B."

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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

  • 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

  • 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 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

  • 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

  • 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

  • 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

  • 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

  • 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

  • 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

  • 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

  • IPEN-DOC 25819

    CREMA, E.; ZAGATTO, V.A.B.; SHORTO, J.M.B. ; PAES, B.; LUBIAN, J.; SIMÕES, R.F.; MONTEIRO, D.S.; HUIZA, J.F.P.; ADDED, N.; MORAIS, M.C.; GOMES, P.R.S.. Reaction mechanisms of the O-16 + Cu-65 system. Physical Review C, v. 99, n. 5, p. 054623-1 - 054623-10, 2019. DOI: 10.1103/PhysRevC.99.054623

    Abstract: We have measured a precise quasielastic excitation function for the 16O + 65Cu system, at θLAB = 161◦, and at bombarding energies near the Coulomb barrier. A quasielastic barrier distribution for this system was deduced from the experimental quasielastic excitation function. An α-stripping excitation function has also been measured at the same experimental conditions. These new data have been used to investigate the relative importance of several reaction channels in the reaction mechanism of the 16O + 65Cu system. Large-scale coupled-channel calculations and coupled-reaction-channel calculations have been performed. No imaginary potential was used at the barrier region because many channels have been explicitly included in the calculations. Only an inner short-range potential was used to account for the fusion process. We did not fit data by varying potential parameters, and our theoretical results were compared directly to data. Good agreement was found between data and calculations. Owing to the high sensitivity of the barrier distribution, important results have been obtained. The first excited state (1/2−) of 65Cu has less influence in the reaction mechanism than the second (5/2−) and third (7/2−) states, which are the most relevant among all the investigated ones. We have also observed a striking influence of the reorientation of the ground-state spin of the 65Cu nucleus on the elastic scattering at backward angles. In addition, calculations have shown that the excitation of the states 3− , 2+ , 1−, and 2− of the projectile 16O are also important for excellent agreement obtained with both the excitation function and the distribution of barriers. The α-stripping data have been compared to the results of coupled-reaction-channel calculations and good agreement was obtained with the inclusion of the first excited state of 12C in the coupling scheme. However, the α-transfer process has a small influence on the reaction dynamics of this system at the investigated energies.

    Palavras-Chave: copper isotopes; oxygen 16 reactions; copper 65 target; elastic scattering; chemical reactions; theoretical data; experimental data

  • IPEN-DOC 25201

    CREMA, E.; ZAGATTO, V.A.B.; SHORTO, J.M.B. ; PAES, B.; LUBIAN, J.; SIMOES, R.F.; MONTEIRO, D.S.; HUIZA, J.F.P.; ADDED, N.; MORAIS, M.C.; GOMES, P.R.S.. Reaction mechanisms of the O-18+Cu-63 system at near-barrier energies. Physical Review C, v. 98, n. 4, p. 044614-1 - 044614-10, 2018. DOI: 10.1103/PhysRevC.98.044614

    Abstract: A precise quasielastic excitation function for the O-18 + Cu-63 system has been measured at energies around the Coulomb barrier at theta(LAB) = 161 degrees. The corresponding quasielastic barrier distribution has been derived. Two-neutron-, one-proton-, and alpha-transfer-excitation functions have also been measured at the same energies and angle. Coupled reaction channels calculations were performed to describe the experimental data. Largescale shell-model calculations were performed to derive most of the spectroscopic amplitudes. No surface imaginary potential was necessary for the interaction potential because almost all relevant reaction channels were explicitly included in the calculation. The theoretical results were compared to the experimental quasielastic barrier distribution and a very good agreement was achieved. The comparison of the coupled reaction channel calculations and data has put in evidence several important details of the reaction mechanism of the O-18 + Cu-63 system. The collectivity of the Cu-63 nucleus has important contribution to the reaction mechanism of this system, mainly due to its first 5/2(+) and 7/2(+) states. It was also observed a striking influence on the reaction dynamics of the O-18(2(+)) state, the two-neutron transfer and the reorientation of the target ground-state spin. The best agreement to data was achieved when the nuclear matter diffuseness for the O-18 was assumed equal to 0.60 fm, value that we have derived in a previous paper and that is 10% greater than the O-16 diffuseness. Another significant result was that the two-neutron transfer process is much more relevant than the one-neutron-transfer process, which suggests that the pairing correlation could play an important role in the transfer process of this system.

    Palavras-Chave: copper isotopes; oxygen 18 reactions; copper 63 target; elastic scattering; chemical reactions; theoretical data; experimental data

  • 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 27428

    CAVALLARO, M.; ACOSTA, L.; ADSLEY, P.; AGODI, C.; ALTANA, C.; AMADOR-VALENZUELA, P.; AUERBACH, N.; BAREA, J.; BELLONE, J.I.; BIJKER, R.; BORELLO-LEWIN, T.; BOZTOSUN, I.; BRANCHINA, V.; BRASOLIN, S.; BRISCHETTO, G.A.; BRUNASSO, O.; BURRELLO, S.; CAMPAJOLA, L.; CALABRESE, S.; CALABRETTA, L.; CALVO, D.; CAPIROSSI, V.; CAPPUZZELLO, F.; CARBONE, D.; CHARON GARCIA, L.E.; CHÁVEZ LOMELI, E.R.; CHEN, R.; CIRALDO, I.; COLONNA, M.; CUTULI, M.; D'AGOSTINO, G.; DELAUNAY, F.; DESHMUKH, N.; DJAPO, H.; GAMBACURTA, D.; DE GERONIMO, G.; DE LOS RÌOS, K.; EKE, C.; FERRARESI, C.; FERREIRA, J.L.; FERRETTI, J.; FINOCCHIARO, P.; FIRAT, S.; FISICHELLA, M.; FLECHAS GARCIA, D.C.; FOTI, A.; GANDOLFO, E.; GARCIA-TECOCOATZI, H.; HACISALIHOGLU, A.; HUERTA-HERNANDEZ, A.; KOTILA, J.; KUCUK, Y.; IAZZI, F.; JIVAN, H.; LANZALONE, G.; LAY, J.A.; LA FAUCI, L.; LA VIA, F.; LENSKE, H.; LINARES, R.; LUBIAN, J.; MA, J.; MARIN-LÁMBARRI, D.; MAS RUIZ, J.; MEDINA, N.H.; MENDES, D.R.; MEREU, P.; MORALLES, M. ; NERI, L.; NEVELING, R.; OLIVEIRA, J.R.B.; PAKOU, A.; PANDOLA, L.; PELLEGRI, L.; PETRASCU, H.; PIETRALLA, N.; PINNA, F.; REITO, S.; RIES, P.C.; 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.; WERNER, V.; YANG, Y.; YILDIRIN, A.; ZAGATTO, V.A.B.. Recent results on heavy-ion direct reactions of interest for 0νββ decay at INFN - LNS. Journal of Physics: Conference Series, v. 1610, p. 1-7, 2020. DOI: 10.1088/1742-6596/1610/1/012004

    Abstract: Neutrinoless double beta decay of nuclei, if observed, would have important implications on fundamental physics. In particular it would give access to the effective neutrino mass. In order to extract such information from 0νββ decay half-life measurements, the knowledge of the Nuclear Matrix Elements (NME) is of utmost importance. In this context the NUMEN and the NURE projects aim to extract information on the NME by measuring cross sections of Double Charge Exchange reactions in selected systems which are expected to spontaneously decay via 0νββ. In this work an overview of the experimental challenges that NUMEN is facing in order to perform the experiments with accelerated beams and the research and development activity for the planned upgrade of the INFN-LNS facilities is reported.

    Palavras-Chave: double beta decay; neutrinos; neutrinoless double beta decay; direct reactions; heavy ion reactions; nuclear matrix; magnetic spectrometers

  • IPEN-DOC 26499

    AGODI, C.; CAPPUZZELLO, F.; ACOSTA, L.; ALTANA, C.; AMADOR-VALENZUELA, P.; AUERBACH, N.; BAREA, J.; BELLONE, J.I.; 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.; CHARON GARCIA, L.E.; CHAVEZ LOMELI, E.R.; CIRALDO, I.; COLONNA, M.; D’AGOSTINO, G.; DJAPO, H.; GERONIMO, G. de; DELAUNAY, F.; DE LOS RIOS, K.; DESHMUKH, N.; 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, J.; KUCUK, Y.; IAZZI, F.; LA FAUCI, L.; LANZALONE, G.; LA VIA, F.; LAY, J.A.; 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.; VSEVOLODOVNA, R.I.M.; VARGAS HERNANDEZ, H.; WANG, J.S.; WERNER, V.; YANG, Y.Y.; YILDIRIM, A.; ZAGATTO, V.A.B.. Recent results on Heavy-Ion induced reactions of interest for 0νββ decay. Journal of Physics: Conference Series, v. 1308, p. 1-5, 2019. DOI: 10.1088/1742-6596/1308/1/012002

    Abstract: An updated overview of recent results on Heavy-Ion induced reactions of interest for neutrinoless double beta decay is reported in the framework of the NUMEN project. The NUMEN idea 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 (0νββ) decay. Moreover, to infer the neutrino average masses from the possible measurement of the half- life of 0νββ decay, the knowledge of the nuclear matrix elements is a crucial aspect.

    Palavras-Chave: double beta decay; nuclear matrix; heavy ions; beta decay; magnetic spectrometers; neutrinos; infn

  • IPEN-DOC 26502

    ZAGATTO, V.A.B.; CREMA, E.; SHORTO, J.M.B. ; MORAIS, M.C.; LUBIAN, J.; ADDED, N.; SIMÕES, R.F.; MONTEIRO, D.S.; HUIZA, J.F.P.; PAES, B.; GOMES, P.R.S.. Scattering of 16,18O beams on 63,65Cu targets: a systematic study of different reaction channels. Physical Review C, v. 100, n. 4, p. 044602-1 - 044602-11, 2019. DOI: 10.1103/PhysRevC.100.044602

    Abstract: Precise quasielastic experimental excitation function for the 18O + 65Cu system has been measured and its barrier distribution has been derived. Several reaction channels have been observed on the experimental spectra, revealing the presence of two-neutron and α-stripping processes, as well as the proton pickup transfer, for which excitation functions were also measured. Extensive coupled channel and coupled reaction channel calculations have been performed to describe the experimental data. The inelastic couplings of target and projectile, and the ground state reorientation of the target, were important to the proper description of data. The transfer data were well described by calculations; however, it was shown that they almost do not affect the excitation function of 18O + 65Cu quasielastic scattering. Whenever possible, structure shell model calculations have been performed to obtain the spectroscopic amplitudes of projectile and target overlaps. The two-neutron and α-transfer reactions have been calculated considering the transferred particle as a cluster with spin 0.

    Palavras-Chave: excitation systems; inelastic scattering; nuclear reactions; copper 63 reactions; copper 65 reactions; oxygen 16 reactions; oxygen 18 reactions; beams

  • IPEN-DOC 25209

    LEISTENSCHNEIDER, E.; LEPINE-SZILY, A.; ALVAREZ, M.A.G.; MENDES, D.R.; LICHTENTHALER, R.; AGUIAR, V.A.P.; ASSUNCAO, M.; PAMPA CONDORI, R.; SILVA, U.U. da; FARIA, P.N. de; DESHMUKH, N.; DUARTE, J.G.; GASQUES, L.R.; GUIMARAES, V.; MACCHIONE, E.L.A.; MORAIS, M.C.; MORCELLE, V.; PIRES, K.C.C.; SCARDUELLI, V.B.; SCOTTON, G.; SHORTO, J.M.B. ; ZAGATTO, V.A.B.. Spectroscopy of high-lying resonances in 9Be by the measurement of ( p, p), ( p, d), and ( p, α) reactions with a radioactive 8Li beam. Physical Review C, v. 98, n. 6, p. 064601-1 - 064601-1, 2018. DOI: 10.1103/PhysRevC.98.064601

    Abstract: We measured the 8Li(p, p)8Li, 8Li(p, d)7Li, and 8Li(p, α)5He reactions at low energies using the thick target inverse kinematics method, with a polyethylene [CH2]n target and a radioactive 8Li beam available at the Radioactive Ion Beams in Brazil facility of São Paulo. By measuring simultaneously several reaction channels (p, p), (p, d), and (p, α), the still uncertain high-lying resonances of 9Be, close to the proton threshold, can be studied and their parameters, such as energy, width, and spin parity can be more reliably determined. The experimental excitation functions of the reactions 8Li(p, p)8Li, 8Li(p, d)7Li, and 8Li(p, α)5He were analyzed using the R-matrix theory, which allows us to infer the properties of the resonances. Multichannel R-matrix analysis provides evidence for a significant clustering in the (p, d) channel. The experimental data and the multichannel R-matrix analysis will be presented.

    Palavras-Chave: spectroscopy; lithium 8 beams; beryllium 9; resonance; radioactive ion beams; elastic scattering; polyethylenes; targets; nucleosynthesis; excitation functions

  • IPEN-DOC 26521

    SANTOS, O.C.B.; LICHTENTHALER, R.; PIRES, K.C.C.; MORO, A.M.; UMBELINO, U.; ZEVALLOS, E.O.N.; ASSUNÇÃO, M.; APPANNABABU, S.; ALCANTARA-NUÑEZ, J.; LARA, A.L. de; SCARDUELLI, V.; GUIMARÃES, V.; LEPINE-SZILY, A.; SERRA, A.S.; LINARES, R.; ZAGATTO, V.A.B.; FARIA, P.N. de; MORCELLE, V.; MORAIS, M.C.; BARIONI, A.; SHORTO, J.M.B. . Spin-orbit effects in the 8Li+58Ni elastic scattering. Journal of Physics: Conference Series, v. 1291, n. 1, p. 1-5, 2019. DOI: 10.1088/1742-6596/1291/1/012030

    Abstract: In this work we present an elastic scattering angular distribution for the 8Li+58Ni system measured at Elab = 26.1 MeV. The 8Li beam was produced in the Radioactive Ion Beams in Brasil (RIBRAS) facility using the 7Li primary beam delivered by the 8-UD Pelletron accelerator. The angular distribution covers the angular range from 20 to 85 degrees in the center of mass frame. The data have been analysed by optical model and coupled channels calculations, including couplings to low-lying states in 8Li and the spin-orbit interaction. Our results indicate that the inclusion of the spin-orbit interaction in the calculations is important to describe the data at backward angles.

    Palavras-Chave: elastic scattering; lithium 8; nickel 58; beams; beams; angular distribution; l-s coupling; monte carlo method; simulation

  • IPEN-DOC 26686

    CREMA, E.; PAES, B.; ZAGATTO, V.A.B.; HUIZA, J.F.P.; LUBIAN, J.; SHORTO, J.M.B. ; SIMÕES, R.F.; MONTEIRO, D.S.; ADDED, N.; MORAIS, M.C.; GOMES, P.R.S.. Strong neutron-transfer coupling effects in the reaction mechanism of the 18O + 64Zn system at energies near the Coulomb barrier. Physical Review C, v. 100, n. 5, p. 054608-1 - 054608-11, 2019. DOI: 10.1103/PhysRevC.100.054608

    Abstract: The precise quasielastic excitation function for the 18O + 64Zn system was measured at energies near and below the Coulomb barrier at θlab = 161◦, from which its correlated quasielastic barrier distribution was derived. The excitation functions for the two-neutron, α, and tritium transfer reactions have also been measured at the same conditions. These data were well described by the coupled channel and coupled reaction channel calculations. The comparison of the data with theoretical calculations shows the strong influence of three inelastic channels in the coupling process: the quadrupole and octupole vibrational states of 64Zn, 2+ 1 and 3− 1 , and the quadrupole vibrational state of 18O, 2+ 1 . In addition, theoretical calculations indicate that the two-neutron stripping is mostly due to a one-step process, which has a striking effect on the reaction mechanism of this system.

    Palavras-Chave: energy dependence; coulomb field; neutron transfer; zinc 64 target; oxygen 18; coupling; inelastic scattering; tritium; transfer reactions

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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.