Effect of Nuclear Deformation on Gamow-teller Strength Distributions of Hg Isotopes

Recent studies (Boillos and Sarriguren, Phys. Rev. C 3(91):034311, 2015; Moreno et al., Phys. Rev. C, 73(5):054302, 2006) predicted the sensitivity of the Gamow-Teller (GT) strength distributions on nuclear deformation in neutron-deficient fig isotopes. Motivated by this work we investigate nuclear ground state properties and GT strength distributions for neutrondeficient Hg isotopes (Hg177-193). The nuclear deformation (beta(2)) values were calculated using the Relativistic Mean Field (RMF) model. The RMF approach with different density-dependent interactions, namely, DD-ME2 (meson-exchange) and DD-PC1 (point-coupling), was used to compute nuclear shape parameters. The computed deformation values were later used within the framework of deformed proton-neutron quasi-random phase approximations (pn-QRPA) model, with a separable interaction, to calculate the allowed GT strength distributions for these Hg isotopes. Our calculations validate the findings of Boillos and Sarriguren (Phys. Rev. C 3(91):034311, 2015) and confirmed the effect of deformation on GT strength distributions. Our study may further provide a complementary signature for nuclear shape isomers. Noticeable differences are highlighted between the current and previous calculations. The calculation of Boillos and Sarriguren (Phys. Rev. C 3(91):034311, 2015) shows that Hg174-182 posses prolate and Hg184-196 have oblate shapes. Our calculation, on the other hand, predicts prolate shape for Hg177-185 and oblate shape for Hg186-193 isotopes. We finally analyze the effect of deformation on the calculated T-1/2 for the selected Hg isotopes. Our half-life calculations do not validate the findings of Moreno et al. (Phys. Rev. C 73(5):054302, 2006) that T(1/2)( )values are not good enough observables to study deformation effects.

Automated summary

This study investigates the effects of nuclear deformation on Gamow-Teller strength distributions in neutron-deficient Hg isotopes. The calculated results validate previous findings and highlight noticeable differences. The study also analyzes the impact of deformation on the calculated half-life of the selected Hg isotopes, showing disagreement with previous observations.