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20 April 2024

» arxiv » 1910.3000

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20Ne + 76Ge elastic and inelastic scattering at 306 MeV
A. Spatafora ; F. Cappuzzello ; D. Carbone ; M. Cavallaro ; J. A. Lay ; L. Acosta ; C. Agodi ; D. Bonanno ; D. Bongiovanni ; I. Boztosun ; G. A. Brischetto ; S. Burrello ; S. Calabrese ; D. Calvo ; E. R. Chàvez Lomelí ; I. Ciraldo ; M. Colonna ; F. Delaunay ; N. Deshmukh ; J. L. Ferreira ; P. Finocchiaro ; M. Fisichella ; A. Foti ; G. Gallo ; A. Hacisalihoglu ; F. Iazzi ; G. Lanzalone ; H. Lenske ; R. Linares ; D. Lo Presti ; J. Lubian ; M. Moralles ; A. Muoio ; J. R. B. Oliveira ; A. Pakou ; L. Pandola ; H. Petrascu ; F. Pinna ; S. Reito ; G. Russo ; G. Santagati ; O. Sgouros ; S. O. Solakci ; V. Soukeras ; G. Souliotis ; D. Torresi ; S. Tudisco ; A. Yildirim ; V. A. B. Zagatto ;
Date:	7 Oct 2019
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-beta 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-beta 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{deg}). A correction in the geometry to effectively account for deformation of the involved nuclear systems improves the agreement up to about 14{deg}. Coupled channels effects are crucial to obtain good agreement at large angles in the elastic scattering cross section.
Source:	arXiv, 1910.3000
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