Orateur
Description
In recent years new processes involving weak nuclear interactions have been studied experimentally and theoretically [1]. This kind of interactions play a fundamental role in the understanding heavier elements nucleosynthesis in the universe. The presence of heavy elements is only understood if stellar reactions take place involving regions of the nuclear chart far away from the stability line [2]. The process is supposed to occurs in astrophysics sites of high energy events in the galaxy such as supernova explosion and halo of merging binary system [3]. The later has been studied due to recently multi-messenger observations from neutron star collisions. Neutrinos fluxes are produced in this high energy events, thus it important to discuss the role of
neutrinos in nucleosynthesis of heavy elements. There are three processes responsible of heavy element formation: the s-, the p- and the r-process. We are interested in sites with temperature and neutron density very high, so the r-process is predominant. In order to discuss this process, we need to evaluate the half-lives of beta-decay, the neutrino and the electron capture rates, that are in competition with the neutron and proton capture by nucleus. For this, we adopted the Gross Theory of Beta Decay (GTBD) [4] in this work, which presents a great advantage over the other approaches specially in astrophysical applications.
References
[1] A. S. Barabash, Physics of Elementary Particles and Atomic
Nucleus 42, 1183 (2011).
[2] A.R. Samana, C. Barbero, S.B. Duarte, A.J. Dimarco, F.
Krmpotic, New Jour. Phys. 10, 1 (2008).
[3] B. Côte, et al., Astr. Jour. 875, 106 (2019).
[4] K. Takanahashi, M. Yamada, Prog. Theor. Phys. 41, 1470
(1969)
