Studies of ^144,148Sm+α potential for the p-process nucleosynthesis
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 ^144Sm, an intriguing p-nucleus that is semi-magic with 82 neutrons. This work presents new experimental data on α elastic and inelastic scattering on ^148Sm, 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.
Versions
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BibTeX
@misc{soto2026studies,
title = {{Studies of $\rm ^144,148Sm+α$ potential for the $p$-process nucleosynthesis}},
author = {C. Soto and C. Ducoin and N. Millard-Pinard and B. M. Rebeiro and O. Stézowski and N. de Séréville and F. Hammache and A. Chalil and Y. Demane and C. Bachelet and J. -C. Thomas and M. Assié and M. Benhatchi and V. Girard-Alcindor and S. V. Harissopulos and H. Jacob and A. Lagoyannis and S. Morard and S. Nandi and J. Pépin and L. Perrot and A. M. Sánchez-Benítez and I. Stefan and T. Zanatta-Martinez},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2606.02266},
eprint = {2606.02266},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2606.02266},
note = {CC BY-NC-SA 4.0},
}
RIS
TY - UNPB
TI - Studies of ^144,148Sm+α potential for the p-process nucleosynthesis
AU - C. Soto
AU - C. Ducoin
AU - N. Millard-Pinard
AU - B. M. Rebeiro
AU - O. Stézowski
AU - N. de Séréville
AU - F. Hammache
AU - A. Chalil
AU - Y. Demane
AU - C. Bachelet
AU - J. -C. Thomas
AU - M. Assié
AU - M. Benhatchi
AU - V. Girard-Alcindor
AU - S. V. Harissopulos
AU - H. Jacob
AU - A. Lagoyannis
AU - S. Morard
AU - S. Nandi
AU - J. Pépin
AU - L. Perrot
AU - A. M. Sánchez-Benítez
AU - I. Stefan
AU - T. Zanatta-Martinez
PY - 2026
DA - 2026/09/18
PB - arXiv
DO - 10.48550/arxiv.2606.02266
UR - https://arxiv.org/abs/2606.02266
AB - 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 ^144Sm, an intriguing p-nucleus that is semi-magic with 82 neutrons. This work presents new experimental data on α elastic and inelastic scattering on ^148Sm, 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.
ER -