High-spinγ-ray spectroscopy inZ=83isotopes:199,201Bi

The properties of high-spin states in ${}_{}{}^{199}{}_{}{}^{}$,201Bi have been studied with the ${}_{}{}^{194}{}_{}{}^{}$,196Pt${(}^{10}$B,5nγ )${}^{199}$,201Bi reactions at energies between 57 and 72 MeV. In-beam measurements of γ-ray excitations, γ-γ-t coincidences and correlations, γ-ray angular distributions, and pulsed-beam-γ timing were performed with Ge detectors to determine level energies, decay schemes, γ-ray multipolarities, $J^{\pi }$ assignments, and isomeric lifetimes. Levels along and near the yrast lines were established up to J≊(33/2), including a number of isomers. The systematic trends of three-quasiparticle level energies in odd-mass Bi isotopes have been extended and compared with calculations involving neutron-hole configurations of the Pb-core isotones. The transition strengths extracted for ${}_{}{}^{199}{}_{}{}^{}$,201Bi are compared to Pb-region values. In addition, an isomeric lifetime was measured in ${}_{}{}^{200}{}_{}{}^{}\mathrm{Bi}$.