Impact of the first-forbidden $\beta$ decay on the production of $A\sim 195$ r-process peak

Abstract

We investigated the effects of first-forbidden transitions in $\beta$ decays on the production of the r-process $A\sim 195$ peak. The theoretical calculated $\beta$-decay rates with $\beta$-delayed neutron emission were examined using several astrophysical conditions. As the first-borbidden decay is dominant in $N\sim 126$ neutron-rich nuclei, their inclusion shortens $\beta$-decay lifetimes and shifts the abundance peak towards higher masses. Additionally, the inclusion of the $\beta$-delayed neutron emission results in a wider abundance peak, and smoothens the mass distribution by removing the odd-even mass staggering. The effects are commonly seen in the results of all adopted astrophysical models. Nevertheless there are quantitative differences, indicating that remaining uncertainty in the determination of half-lives for $N=126$ nuclei is still significant in order to determine the production of the r-process peak.

arXiv comment6 pages, 4 figures, 1 table, Phys. Lett. B, in press

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• The lanthanide fraction distribution in metal-poor stars: a test of neutron star mergers as the dominant r-process site
• Impact of systematic nuclear uncertainties on composition and decay heat of dynamical and disk ejecta in compact binary mergers
• Nuclear Weak Rates and Nuclear Weak Processes in Stars
• r-Process enrichment in the Galactic halo characterized by nucleosynthesis variation in the ejecta of coalescing neutron star binaries
• $\beta$-delayed spectroscopy of ${}^{80}$Ge${}_{48}$ and competition between Gamow-Teller and first-forbidden transitions in ${}^{80g+m}$Ga${}_{49}$ $\beta$ decay