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Impact of the first-forbidden ß decay on the production of A ~ 195 r-process peak

Impact of the first-forbidden ß decay on the production of A ~ 195 r-process peak Thumbnail


Abstract

We investigated the effects of first-forbidden transitions in ß decays on the production of the r-process peak. The theoretical calculated ß-decay rates with ß-delayed neutron emission were examined using several astrophysical conditions. As the FF decay is dominant in neutron-rich nuclei, their inclusion shortens ß-decay lifetimes and shifts the abundance peak towards higher masses. Additionally, the inclusion of the ß-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 nuclei is still significant in order to determine the production of the r-process peak.

Citation

(2016). Impact of the first-forbidden ß decay on the production of A ~ 195 r-process peak. Physics Letters B, 273-277. https://doi.org/10.1016/j.physletb.2016.03.025

Acceptance Date Mar 10, 2016
Publication Date Mar 15, 2016
Journal Physics Letters B
Print ISSN 0370-2693
Publisher Elsevier
Pages 273-277
DOI https://doi.org/10.1016/j.physletb.2016.03.025
Keywords r-Process, Solar abundances, ß-Decay, First-forbidden transition, Neutron emission, QRPA
Publisher URL http://dx.doi.org/10.1016/j.physletb.2016.03.025

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