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Allowed and forbidden ?-decay log ft values of neutron-rich Pb and Bi isotopes
(Springer, 2024) Cakmak, Necla; Nabi, Jameel-Un; Mehmood, Arslan; Ullah, Asim; Tahir, Rubba
The beta-decay log ft values for Pb210-215 -> Bi210-215 and Bi210-215 -> Po210-215 transitions in the north-east region of Pb-208 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 beta-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 beta-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 beta-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.