Shape coexistence and signature splitting in Br77

G. N. Sylvan, J. E. Purcell, J. Döring, J. W. Holcomb, G. D. Johns, T. D. Johnson, M. A. Riley, P. C. Womble, V. A. Wood, S. L. Tabor

Research output: Contribution to journalArticlepeer-review

19 Scopus citations

Abstract

High angular momentum states in Br77 were populated via the Cu65(18O,α2n)77Br reaction at 65 MeV using the Florida State University (FSU) FN Tandem-LINAC accelerator. The Pitt-FSU array with 9 Compton-suppressed high purity Ge detectors was used to measure prompt γ-γ coincidences. Analysis of the coincidences led to an extension of the positive- and negative-parity bands to spins of (41/2+) and (43/2-). Directional correlation of oriented nuclei ratios have been deduced where possible, and spin assignments made accordingly. A cranked-shell-model analysis shows that in the positive-parity band the νg9/2 alignment occurs at the same frequency as in the neighboring isotopes, Br75,79, but with a larger interaction strength. In the negative-parity bands the lower πg9/2 crossing also occurs at about the same frequency as in Br75, but with a smaller interaction. The higher frequency νg9/2 crossing is delayed in Br77. Hartree-Fock-Bogolyubov cranking calculations predict considerable γ softness in Br77, and particle-rotor model calculations support the interpretation of γ softness or variations in triaxiality within the bands.

Original languageEnglish
Pages (from-to)2252-2260
Number of pages9
JournalPhysical Review C - Nuclear Physics
Volume48
Issue number5
DOIs
StatePublished - 1993
Externally publishedYes

Fingerprint

Dive into the research topics of 'Shape coexistence and signature splitting in Br77'. Together they form a unique fingerprint.

Cite this