Coulomb Excitation of Bromine and Rhenium

Abstract

Separated isotopes of bromine and rhenium have been studied by means of Coulomb excitation with 2- to 4.2-Mev protons and alpha particles. Gamma rays were observed with a NaI crystal spectrometer at the following energies: ${\mathrm{Br}}^{79}$, 219 kev; ${\mathrm{Br}}^{81}$, 278 kev; ${\mathrm{Re}}^{185}$, 126, 160, and 286 kev; ${\mathrm{Re}}^{187}$, 135, 168, and 303 kev. Probable level schemes are given which are based on coincidence measurements and, in some cases, on excitation curves. The results from data on ${\mathrm{Ta}}^{181}$ taken in the course of this study are also included. The reduced transition probabilities for excitation of all relevant nuclear levels have been measured. In the case of Ta and the Re isotopes the cascade to crossover intensity ratio in the decay of the second excited state has also been measured.