Properties of the rotational bands in the transitional nucleusPt189

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Abstract

High-spin states in $^{189}\mathrm{Pt}$ have been studied experimentally using the $^{176}\mathrm{Yb}(^{18}\mathrm{O},5n)$ reaction at beam energies of 88 and 95 MeV. The level scheme of $^{189}\mathrm{Pt}$ has been revised significantly and extended to high-spin states. Rotational bands have been analyzed in the framework of triaxial particle-rotor model, and a $\ensuremath{\gamma}\ensuremath{\approx}\ensuremath{-}{30}^{\ifmmode^\circ\else\textdegree\fi{}}$ triaxial shape and a near-prolate shape have been proposed to the $\ensuremath{\nu}{i}_{13/2}^{\ensuremath{-}1}$ and $\ensuremath{\nu}{f}_{5/2}({p}_{3/2})$ bands, respectively. Two $\ensuremath{\Delta}I=2$ transition sequences with similar energies have been observed, and they have been proposed to be associated with the $\ensuremath{\nu}{i}_{13/2}^{\ensuremath{-}2}\ensuremath{\nu}{f}_{5/2}({p}_{3/2})$ configuration. The structure built on the $\ensuremath{\nu}{i}_{13/2}^{\ensuremath{-}2}\ensuremath{\nu}{f}_{5/2}({p}_{3/2})$ configuration could be interpreted as a pair of pseudospin partners. The level energies in the pseudospin partner bands are well reproduced by the theoretical calculations of the triaxial particle-rotor model if a near-oblate shape is assumed.

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