High-spin states inBr83andRb85

Abstract

High spin states in $^{83}\mathrm{Br}$ and in $^{85}\mathrm{Rb}$ were studied via the reactions $^{82}\mathrm{Se}$($^{6}\mathrm{Li}$,$\ensuremath{\alpha}n\ensuremath{\gamma}$)$^{83}\mathrm{Br}$, $^{82}\mathrm{Se}$($^{7}\mathrm{Li}$,$\ensuremath{\alpha}2n\ensuremath{\gamma}$)$^{83}\mathrm{Br}$, $^{82}\mathrm{Se}$($^{6}\mathrm{Li}$,$3n\ensuremath{\gamma}$)$^{83}\mathrm{Rb}$, and $^{82}\mathrm{Se}$($^{7}\mathrm{Li}$,$4n\ensuremath{\gamma}$)$^{85}\mathrm{Rb}$ at beam energies of 25 to 36 MeV. In-beam $\ensuremath{\gamma}$ techniques were used to collect the data. Level schemes were constructed and spin and parity assignments were deduced. Thirty four $\ensuremath{\gamma}$ rays could be placed in two level schemes. Three new levels with spins up to $\frac{17}{2}$, $\frac{19}{2}\ensuremath{\hbar}$ could be established for $^{83}\mathrm{Br}$ and thirteen for $^{85}\mathrm{Rb}$ with spins up to $\frac{29}{2}\ensuremath{\hbar}$. Strongly populated yrast bands were found in both nuclei.NUCLEAR REACTIONS $^{82}\mathrm{Se}$($^{7}\mathrm{Li}$,$\ensuremath{\alpha}2n\ensuremath{\gamma}$)$^{83}\mathrm{Br}$, $^{82}\mathrm{Se}$($^{7}\mathrm{Li}$,$4n\ensuremath{\gamma}$)$^{85}\mathrm{Rb}$, $^{82}\mathrm{Se}$ ($^{6}\mathrm{Li}$,$\ensuremath{\alpha}n\ensuremath{\gamma}$)$^{83}\mathrm{Br}$, $^{82}\mathrm{Se}$($^{6}\mathrm{Li}$,$3n\ensuremath{\gamma}$)$^{85}\mathrm{Rb}$; measured ${E}_{\ensuremath{\gamma}}$, ${I}_{\ensuremath{\gamma}}$, ${I}_{\ensuremath{\gamma}}(\ensuremath{\theta})$, $\ensuremath{\sigma}(E,{E}_{\ensuremath{\gamma}})$, $\ensuremath{\gamma}\ensuremath{\gamma}$ coin.; deduced levels, $J$, $\ensuremath{\pi}$. Enriched target, Ge(Li) detectors.