Shears mechanism in109In

Abstract

High spin states of ${}^{109}$In were investigated using the reaction ${}^{96}$Zr(${}^{19}$F, 6n)${}^{109}$In at a beam energy of 105 MeV. New level sequences have been found in this nucleus. In an earlier known band, the ordering of some of the transitions have been changed and assigned a three-quasiparticle $\ensuremath{\pi}$(g${}_{9/2}$)${}^{\ensuremath{-}1}$ $\ensuremath{\bigotimes}$ $\ensuremath{\nu}$[h${}_{11/2}$(d${}_{5/2}$/g${}_{7/2}$)] configuration. Similar three-quasiparticle bands have also been found earlier in lighter mass ${}^{105}$In and ${}^{107}$In nuclei. Systematics of these bands in ${}^{105}$In, ${}^{107}$In, and ${}^{109}$In nuclei are discussed in the present work within the framework of the tilted axis cranking model.