β-decay of N=126 isotones for the r-process nucleosynthesis

The beta-decay properties of nuclei with neutron number N = 126 is investigated in this paper. Two different versions of the proton-neutron quasi particle random phase (pn-QRPA) model were employed to compute beta-decay rates and half-lives for the N = 126 isotones. The first set of calculation solves the pn-QRPA equations using the schematic model (SM) approach. The Woods-Saxon potential was employed as a mean-field basis. A spherical shape assigned for each waiting point nuclei throughout all simulations. Both allowed Gamow-Teller (GT) and first-forbidden (FF) transitions were considered in the particle-hole (ph) channel. The second set uses the pn-QRPA model in deformed Nilsson basis to calculate beta-decay rates for allowed GT and unique first-forbidden (U1F) transitions under terrestrial and stellar conditions. Our results are in agreement with shell model findings that first-forbidden transitions lead to a considerable decrement in the calculated half-lives of the isotones. Inclusion of the first-forbidden contribution led to a decent agreement of our computed terrestrial beta-decay half-lives with measured ones, much better than the previous calculations. The possible implication of the waiting point nuclei on r-process nucleosynthesis is discussed briefly.

Automated summary

This paper investigates the beta-decay properties of nuclei with neutron number N = 126 using two different models to calculate decay rates and half-lives, considering Gamow-Teller and first-forbidden transitions. The inclusion of first-forbidden contributions led to better agreement with measured half-lives, suggesting a significant decrement in calculated half-lives of isotones. The possible implications of waiting point nuclei on r-process nucleosynthesis are briefly discussed.