Nishimura, N, Podolyak, Z, Fang, DL and Suzuki, T (2016) Impact of the first-forbidden β decay on the production of A ∼ 195 r-process peak. Physics Letters B, 756. pp. 273-277. ISSN 1873-2445

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We investigated the effects of first-forbidden transitions in β decays on the production of the r -process A∼195 peak. The theoretical calculated β-decay rates with β-delayed neutron emission were examined using several astrophysical conditions. As the FF decay is dominant in N∼126 neutron-rich nuclei, their inclusion shortens β-decay lifetimes and shifts the abundance peak towards higher masses. Additionally, the inclusion of the β -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.

Item Type: Article
Additional Information: This is the accepted author manuscript (AAM). The final published version (version of record) is available online via Elsevier at Please refer to any applicable terms of use of the publisher.
Uncontrolled Keywords: r-Process; Solar abundances; B-Decay; First-forbidden transition; Neutron emission; QRPA
Subjects: Q Science > QB Astronomy
Divisions: Faculty of Natural Sciences > School of Physical and Geographical Sciences
Depositing User: Symplectic
Date Deposited: 17 Mar 2016 12:32
Last Modified: 22 Jun 2018 09:47

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