Analysis of the one-neutron transfer reaction in 18O+76Se collisions at 275 MeV
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Physical Review C
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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.
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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. Disponível em: http://repositorio.ipen.br/handle/123456789/33220. Acesso em: 20 Mar 2026.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.