Abstract
High-spin states in the $^{188}\mathrm{Pt}$ nucleus have been investigated employing the $^{174}\mathrm{Yb}(^{18}\mathrm{O},4n)^{188}\mathrm{Pt}$ reaction. The level scheme has been significantly extended with the addition of several new $\ensuremath{\gamma}$ rays. The Indian National Gamma Array (INGA) spectrometer consisting of eighteen clover Ge detectors facilitated angular correlation and linear polarization measurements for spin-parity assignment of levels. The ${I}^{\ensuremath{\pi}}={5}^{\ensuremath{-}}$ semi-decoupled band has been investigated in detail, and the long-standing ambiguity regarding the correct ordering of associated $\ensuremath{\gamma}$ rays is now removed with the new observation of transitions linking the even-spin levels to the odd-spin ones. A weak, $\mathrm{\ensuremath{\Delta}}I=2$ sequence of $\ensuremath{\gamma}$ rays with alignment and moment of inertia similar to the yrast, even-spin, rotation-aligned neutron ${i}_{13/2}$ band has been newly observed. Cranking calculations suggest that this new odd-spin sequence arises from the excitation of a valence quasineutron to the next ${i}_{13/2}$ level.
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