Studies in the Decay of 4.7-hRb81

Abstract

4.7-h ${\mathrm{Rb}}^{81}$ was produced from the ${\mathrm{Br}}^{79}(\alpha , 2n){\mathrm{Rb}}^{81}$ and from the ${\mathrm{Br}}^{79}({\mathrm{He}}^3, n){\mathrm{Rb}}^{81}$ reactions. The decay of this isotope was studied using Ge (Li) and standard NaI(Tl) counters. $\gamma$ rays of the following energies have been identified: 190.4, 357.6, 388.2, 446.0, 456.7, 476.6, 537.7, 547.7, 568.8, 729.7, 803.6, 835.4, and 978.0 keV. Information from singles and coincidence measurements has been incorporated into a decay scheme. The proposed levels in ${\mathrm{Kr}}^{81}$ are at 190, 457, 636, 994, and 1025 keV.