A complete set of the low lying $\frac{1}{2^{-}}$ and $\frac{3}{2^{-}}$ levels of ${}_{}{}^{197,199}{}_{}{}^{}\mathrm{Pt}$ was obtained from measurements of the primary $\gamma$-ray spectra following average resonance neutron capture experiments at incident neutron energies centered at 2 and 24 keV. A combination of the ${}_{}{}^{197}{}_{}{}^{}\mathrm{Pt}$ results with those of a recent ($t, p$) experiment allows the further restriction of spin-parity assignments, including some for levels with $J\ge \frac{5}{2}$. The results are discussed in comparison with those previously obtained for ${}_{}{}^{195}{}_{}{}^{}\mathrm{Pt}$ in terms of the Nilsson model and the recently proposed multi-$j$ supersymmetry that may apply in this O(6)-like region.

NUCLEAR STRUCTURE ${}_{}{}^{196}{}_{}{}^{}\mathrm{Pt}(n, \gamma )$, ${}_{}{}^{198}{}_{}{}^{}\mathrm{Pt}(n, \gamma )$, $E_n=2, 24$ keV; measured $E_{\gamma }$, $I_{\gamma }$; ${}_{}{}^{197}{}_{}{}^{}\mathrm{Pt}$, ${}_{}{}^{199}{}_{}{}^{}\mathrm{Pt}$, deduced levels, $J$, $\pi$. Ge(Li) detectors, enriched targets, ARC spectroscopy. Comparison with predictions of multi-$j$ supersymmetry in the interacting boson fermion approximation model.

• Received 30 September 1982

DOI:https://doi.org/10.1103/PhysRevC.27.1310