https://doi.org/10.1140/epja/s10050-024-01298-3
Regular Article - Theoretical Physics
Allowed and forbidden 
-decay log ft values of neutron-rich Pb and Bi isotopes
1
Department of Physics, University of Karabük, 78050, Karabük, Turkey
2
University of Wah, Quaid Avenue, 47040, Wah Cantt, Punjab, Pakistan
3
University of Swabi, Khyber Pakhtunkhwa, Pakistan
Received:
23
July
2023
Accepted:
6
March
2024
Published online:
27
March
2024
The -decay log ft values for 
Pb 
Bi and Bi Po transitions in the north-east region of 
Pb nuclei are estimated using the proton-neutron quasiparticle random phase approximation (pn-QRPA) model. The pn-QRPA equations were solved using the schematic model approach. The Woods–Saxon (WS) potential was inserted as a mean-field basis and nuclei were treated as spherical. Allowed Gamow–Teller (GT) and first-forbidden (FF) transitions were investigated in the particle-hole (ph) channel. The calculated log ft values of the allowed GT and FF transitions using the pn-QRPA model with WS potential were found closer to the experimental values. Later we performed calculation of -decay rates in stellar environment. Here we solved the random phase approximation (RPA) equations in deformed Nilsson basis, both in the particle-particle (pp) and particle-hole (ph) channels. Allowed -decay and unique first-forbidden (U1F) rates were calculated in stellar matter. For certain cases, the calculated U1F contribution was much more than the allowed -decay rates under prevailing stellar conditions, in line with previous findings. Increasing temperature of the stellar core affected the allowed GT rates more than the U1F rates.
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© The Author(s), under exclusive licence to Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature 2024. Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.
