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20Ne + 76Ge elastic and inelastic scattering at 306 MeV

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Title: 20Ne + 76Ge elastic and inelastic scattering at 306 MeV
Authors: 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., Lomelí, E. R. Chàvez, 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. Lo, 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.
Source: Physical Review C 100, 034620 (2019)
Publication Year: 2019
Collection: Nuclear Experiment
Nuclear Theory
Subject Terms: Nuclear Experiment, Nuclear Theory
More Details: 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.
Document Type: Working Paper
DOI: 10.1103/PhysRevC.100.034620
Access URL: http://arxiv.org/abs/1910.03000
Accession Number: edsarx.1910.03000
Database: arXiv
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  Data: 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.
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