Fast beta transition inPt183and the systematics of Nilsson states in theN=105isotones

A $\beta$-decaying state in ${}_{}{}^{183}{}_{}{}^{}\mathrm{Pt}$ with a half-life of 43±5 seconds is observed for the first time and is identified as $\nu$ $\frac{7}{2^{-}}$ 514 ↓ based on a $log\mathrm{ft}$ of 4.3 deduced from the mass tables of Wapstra and Bos. It decays to the $\pi$ $\frac{9}{2^{-}}$ 514 ↑ state in ${}_{}{}^{183}{}_{}{}^{}\mathrm{Ir}$ at 645 keV, which deexcites to the $\frac{5}{2^{-}}$, $\frac{7}{2^{-}}$, and $\frac{9}{2^{-}}$ members of the $\frac{1}{2^{-}}$ 541 ↓ band at 0, 329, and 16 keV, respectively. This is strong evidence for the applicability of the Nilsson model to the light Pt isotopes.