Elsevier

Nuclear Physics A

Volume 646, Issue 2, 8 February 1999, Pages 141-160
Nuclear Physics A

Band structure of 79Br

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Abstract

High-spin states of 79Br have been studied in the reaction 76Ge(7Li, 4nγ) at 32 MeV. A gamma-detector array with twelve Compton-suppressed HPGe detectors was used. The positive-parity yrast states, interpreted as a rotationally aligned g92 proton band, and the negative-parity ground state band have been extended to spins of (332+) and (252), respectively. Lifetime measurements indicate that both bands have a similar quadrupole deformation of β2 ∼ 0.2. The positive-parity α = −12 band has been identified. Several new inter-band transitions are observed. A cranked-shell model analysis shows that the νg92 alignments occur in the positive-parity and the negative-parity bands at rotational frequencies of ℏω ∼ 0.6 and 0.4 MeV, respectively. The level energies and the electromagnetic properties of the g92 band can be well reproduced by a particle-rotor model calculation with an axially symmetric core.

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