Proton emission study as a guide to astrophysical rp process

Pooja Siwach,P Arumugam,L S Ferreira,S Modi,E Maglione,W Liu,B Guo,X Tang,Y Wang,S Zeng

doi:10.1051/epjconf/202226011039

Abstract

Proton emitters play an important role in deciding the path of the astrophysical rapid proton capture (rp) process. The lifetime of these nuclei depends on several factors, like the deformation, angular momentum of the emitted proton, residual interaction between valence proton and neutron (especially in case of odd-odd nuclei) and so on. Therefore, it is worth to investigate the structure of proton emitters to understand the rp process path. However, due to lack of data in this exotic region, the theoretical models should be robust and the dependence on the free parameters should be minimal. In this direction, we have developed the first microscopic approach to study the triaxially deformed odd-odd proton emitters. The application of the developed approach to 108I, a recently observed proton emitter to investigate the end cycle of the rp process, is discussed.

Highlights

When the limits of the nuclear landscape are crossed on the proton-rich side, a nucleus becomes incapable to hold more protons resulting into spontaneous proton emission
The information of proton separation energy of 109I along with the α-decay energy [3] assisted the indirect measurement of proton separation energy of 105Sb to investigate the possible paths in the end-cycle (Sn-Sb-Te cycle) of rp process
This study revealed that the rp process has to deviate its path from 106Sb due to its proton unboundedness

Summary

Introduction

When the limits of the nuclear landscape are crossed on the proton-rich side, a nucleus becomes incapable to hold more protons resulting into spontaneous proton emission. Due to the high Coulomb barrier, the proton spends enough time inside the nucleus to be measured before decay. By investigating the proton separation energies and half-lives one can get direct or indirect information on the path of rp process.

Results

Conclusion