β-Decay properties of neutron-rich yttrium isotopes

In this study, we have reported key nuclear properties of weak beta-decay processes on Yttrium isotopes for the mass number range A = 101 - 108. This mass region has importance while dealing with astrophysical r-process abundances. Our study might be helpful in r-process simulations. We have computed charge-changing strength distributions, beta-decay half-lives, beta-delayed neutron emission probabilities and beta (-) (EC) weak rates under stellar conditions. We have performed microscopic calculations based on deformed proton-neutron quasi-particle random phase approximation (p-n-QRPA) over a wide temperature (10(7) - 3 x 10(10)) K and density (10 - 10(11)) g/cm(3) domain. Unique first-forbidden (U1F) transitions have been included in the calculations in addition to the allowed transitions. A significant decrease in calculated half-lives in ceratin cases, e.g., in Y-107 (Y-108) by about 67% (42%), has been observed because of the contribution from U1F transitions. We have compared present results with measured and theoretical works. A good agreement of our half-lives with experimental data is observed.