Weak process for Iron isotopes chain used as seed for heavy elements nucleosynthesis

• Published in: Journal of physics. Conference series 2022-09, Vol.2340 (1), p.12032
• Main Authors: dos Santos, M., Duarte, S.B., Samana, A.R.
• Format: Article
• Language: English
• Subjects: Astrophysics; Beta decay; Binary stars; Cross-sections; Explosions; GTBD; Half-life; Heavy elements; Interpolation; Iron isotopes; neutrino-nucleus cross section; Neutrinos; Neutron stars; Neutrons; Nuclear fusion; Nuclei; Physics; Polynomials; r-process; Stability; Star mergers
• ISSN: 1742-6588; 1742-6596
• DOI: 10.1088/1742-6596/2340/1/012032

The weak processes are a key to understand the nucleosynthesis of heavy elements in the universe. In this work we have studied weak processes such as β -decay and neutrino capture that are very important for the r-process. This process takes place in a region between neutron drip and β -stability line. For nuclei far from β -stability line the experimental data are very scarce. To study the nucleosynthesis of heavy elements in astrophysics sites like Binary Neutron Star merger (BNS) and Supernova explosions, we have employed the Gross Theory of Beta Decay (GTBD) to evaluate the neutrino-nucleus cross sections and β -decay half-lives. Our 56 Fe( ν e , e − ) 56 Co cross section show a excelent agreement with microscopic models and the half-lives well reproduce the experimental data with a satisfactory accuracy. We have fitted the neutrino-nucleus cross sections obtained by GTBD using a four degree polynomial dependence of the incident neutrino energy. This dependence allows us to systematically calculate the neutrino-nucleus cross sections for a large amount of nuclei, as occurs in the r-process nucleosynthesis calculation (more than 4000 nuclei). Our fitting and interpolation procedures are shown to be in a good agreement and the GTBD cross sections are successfully reproduced.