Decay Scheme ofBr82

Abstract

The radiations from ${\mathrm{Br}}^{82}$ were studied using an intermediate-image coincidence spectrometer, gamma-gamma coincidence scintillation spectrometer, and gamma-gamma directional correlation equipment. One allowed beta-ray group and eight gamma rays were observed. An energy level diagram is proposed. Determinations of the energies, relative intensities, and internal conversion coefficients were made. Five directional correlation measurements were performed between various gamma-ray combinations. Unambiguous assignments for the spins and parities of four of the first five excited levels are made, while the assignment for the remaining level is restricted to two possible values. Multipole mixing ratios were measured for three of the transitions. A possible interpretation of the excited states, in terms of vibrational levels, is proposed.