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.

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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.

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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 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.

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  • 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

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  • 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.

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  • 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.

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  • 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.

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  • 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.

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  • 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.

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  • 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.

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  • IPEN-DOC 26742

    CAPPUZZELLO, F.; AGODI, C.; 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.; FARIA, P.N. de; 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.; ORDONEZ, 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.. The NUMEN Project @ LNS: status and perspectives. Il Nuovo Cimento C, v. 42, n. 2-3, p. 1-7, 2019. DOI: 10.1393/ncc/i2019-19057-2

    Abstract: The NUMEN project aims at accessing experimentally driven information on Nuclear Matrix Elements (NME) involved in the half-life of the neutrinoless double beta decay (0νββ), by high-accuracy measurements of the cross sections of Heavy Ion (HI) induced Double Charge Exchange (DCE) reactions. Particular attention is given to the (18O,18Ne) and (20Ne,20O) reactions as tools for β+β+ and β − β − decays, respectively. First evidence about the possibility to get quantitative information about NME from experiments is found for both kind of reactions. In the experiments, performed at INFN - Laboratory Nazionali del Sud (LNS) in Catania, the beams are accelerated by the Superconducting Cyclotron (CS) and the reaction products are detected by the MAGNEX magnetic spectrometer. The measured cross sections are challengingly low, limiting the present exploration to few selected isotopes of interest in the context of typically low-yield experimental runs. A major upgrade of the LNS facility is foreseen in order to increase the experimental yield of at least two orders of magnitude, thus making feasible a systematic study of all the cases of interest. Frontiers technologies are going to be developed, to this purpose, for the accelerator and the detection systems. In parallel, advanced theoretical models will be developed in order to extract the nuclear structure information from the measured cross sections.

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  • IPEN-DOC 24715

    CAPPUZZELLO, F.; AGODI, C.; CAVALLARO, M.; CARBONE, D.; TUDISCO, S.; LO PRESTI, D.; OLIVEIRA, J.R.B.; FINOCCHIARO, P.; COLONNA, M.; RIFUGGIATO, D.; CALABRETTA, L.; CALVO, D.; PANDOLA, L.; ACOSTA, L.; AUERBACH, N.; BELLONE, J.; BIJKER, R.; BONANNO, D.; BONGIOVANNI, D.; BORELLO-LEWIN, T.; BOZTOSUN, I.; BRUNASSO, O.; BURRELLO, S.; CALABRESE, S.; CALANNA, A.; CHAVEZ LOMELI, E.R.; DAGOSTINO, G.; DE FARIA, P.N.; DE GERONIMO, G.; DELAUNAY, F.; DESHMUKH, N.; FERREIRA, J.L.; FISICHELLA, M.; FOTI, A.; GALLO, G.; GARCIA-TECOCOATZI, H.; GRECO, V.; HACISALIHOGLU, A.; IAZZI, F.; INTROZZI, R.; LANZALONE, G.; LAY, J.A.; LA VIA, F.; LENSKE, H.; LINARES, R.; LITRICO, G.; LONGHITANO, F.; LUBIAN, J.; MEDINA, N.H.; MENDES, D.R.; MORALLES, M. ; MUOIO, A.; PAKOU, A.; PETRASCU, H.; PINNA, F.; REITO, S.; RUSSO, A.D.; RUSSO, G.; SANTAGATI, G.; SANTOPINTO, E.; SANTOS, R.B.B.; SGOUROS, O.; SILVEIRA, M.A.G. da; SOLAKCI, S.O.; SOULIOTIS, G.; SOUKERAS, V.; SPATAFORA, A.; TORRESI, D.; MAGANA VSEVOLODOVNA, R.; YILDIRIM, A.; ZAGATTO, V.A.B.. The NUMEN project: NUclear Matrix Elements for Neutrinoless double beta decay. European Physical Journal A: Hadrons and Nuclei, v. 54, n. 5, 2018. DOI: 10.1140/epja/i2018-12509-3

    Abstract: The article describes the main achievements of the NUMEN project together with an updated and detailed overview of the related R&D activities and theoretical developments. NUMEN proposes an innovative technique to access the nuclear matrix elements entering the expression of the lifetime of the double beta decay by cross section measurements of heavy-ion induced Double Charge Exchange (DCE) reactions. Despite the fact that the two processes, namely neutrinoless double beta decay and DCE reactions, are triggered by the weak and strong interaction respectively, important analogies are suggested. The basic point is the coincidence of the initial and final state many-body wave functions in the two types of processes and the formal similarity of the transition operators. First experimental results obtained at the INFN-LNS laboratory for the Ca-40(O-18, Ne-18)(40) Ar reaction at 270 MeV give an encouraging indication on the capability of the proposed technique to access relevant quantitative information. The main experimental tools for this project are the K800 Superconducting Cyclotron and MAGNEX spectrometer. The former is used for the acceleration of the required high resolution and low emittance heavy-ion beams and the latter is the large acceptance magnetic spectrometer for the detection of the ejectiles. The use of the high-order trajectory reconstruction technique, implemented in MAGNEX, allows to reach the experimental resolution and sensitivity required for the accurate measurement of the DCE cross sections at forward angles. However, the tiny values of such cross sections and the resolution requirements demand beam intensities much larger than those manageable with the present facility. The on-going upgrade of the INFN-LNS facilities in this perspective is part of the NUMEN project and will be discussed in the article.

    Palavras-Chave: nuclear matrix; matrix elements; charge-exchange reactions; accelerator experimental facilities; oxygen 18 reactions; oxygen 20; particle identification; radiation detectors; readout systems; superconducting cyclotrons; calibration; counting techniques; target chambers; cross sections; data processing; ion detection; lifetime; magnetic spectrometers; mev range 100-1000; neon 20 reactions; neutrinoless double beta decay

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