Year: 2026
Type: article
Abstract: Nucleosynthesis reaction networks leading to $p$-nuclei involve a combination of different types of photodisintegration and capture reactions, as well as $β^+$ decays or electron captures. Photodisintegration reactions involving $α$ particles present a particular interest as they serve as branching points of the reaction networks. The cross sections of these reactions depend crucially on the $α$-nucleus interaction. The $α$ optical model potential (AOMP) is determined mostly by means of experimental differential elastic scattering distributions. Several previous studies have focused on the case of $\rm ^{144}Sm$, an intriguing $p$-nucleus that is semi-magic with 82 neutrons. This work presents new experimental data on $α$ elastic and inelastic scattering on $\rm ^{148}Sm$, its closest stable isotope. Isotopic effects on the description of the AOMP are studied, as well as their consequences on the prediction of $α$-induced reaction cross sections at astrophysical energies. It is shown that the isotopic ratio for $(α,γ)$ cross sections can be multiplied up to a factor of two when these effects are included.
Source: Physical Review C
DOI: 10.1103/fhd5-vtkr
Authors: C. Soto, C. Ducoin, N. Millard-Pinard, B. M. Rebeiro, O. Stézowski, N. de Séréville, F. Hammache, A. Chalil, Y. Demane, C. Bachelet, J.-C. Thomas, M. Assié, M. Benhatchi, V. Girard-Alcindor, S. V. Harissopulos, H. Jacob, A. Lagoyannis, S. Morard, S. Nandi, J. Pépin, L. Perrot, A. M. Sánchez-Benítez, I. Stefan, T. Zanatta-Martinez
Institutions: Lyon 1 Université, Centre National de la Recherche Scientifique, Institut de Physique des 2 Infinis de Lyon, Institut National de Physique Nucléaire et de Physique des Particules, Grand Accélérateur National d'Ions Lourds, Université Paris-Saclay, Laboratoire de Physique des 2 Infinis Irène Joliot-Curie, National Centre of Scientific Research "Demokritos", Laboratoire de Physique Subatomique et des Technologies Associées, IMT Atlantique, Université de Nantes, Nantes Université, Universidad de Huelva
Language: English
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W7213332061