Low-spin structure of110Rustudied by β decay of110Tc

Abstract

The decay of the neutron-rich nucleus ${}^{110}\mathrm{Tc}$ has been investigated using \ensuremath{\beta}-\ensuremath{\gamma} and \ensuremath{\gamma}-\ensuremath{\gamma} coincidences. The on-line mass separated source is produced by using the ion-guide technique from fission products. An extended level scheme of ${}^{110}\mathrm{Ru}$ has been constructed, including 20 new excited states and 36 new \ensuremath{\gamma} transitions. The \ensuremath{\beta} feedings, $\mathrm{log}\mathrm{ft}$ values, and $B(E2)$ ratios were extracted. A spin and parity of ${0}^{+}$ is suggested for a level at 1137 keV in ${}^{110}\mathrm{Ru},$ and the spin and parity of the previously identified ${2}_{3}^{+}$ state was confirmed. Level systematics of neutron-rich even-even Ru isotopes shows that the maximum deformation is at $A=112$ $(N=68),$ two neutrons more than the middle of the $N=50--82$ neutron shell. The experimental results are compared with theoretical values calculated by different nuclear models.