Stability of oblate shapes in the vicinity of N= Z = 34 {sup 68}Se : bands in {sup 69}Se and {sup 67}As.
The {gamma}-ray decay schemes of {sup 69}Se and {sup 67}As have been considerably extended using the {sup 40}Ca({sup 32}S,2pn){sup 69}Se and {sup 40}Ca({sup 32}S,{alpha}p){sup 67}As reactions at 100 MeV and {sup 40}Ca({sup 36}Ar,{alpha}2pn){sup 69}Se and {sup 40}Ca({sup 36}Ar,2{alpha}p){sup 67}As reactions at 145 MeV, with the aim of studying oblate bands arising from the strong coupling of a valence g9/2 particle (or hole) to the oblate deformed ground state band of {sup 68}Se. A new T{sub 1/2}=12{+-}2 ns J{sup {pi}}=9/2+ isomeric bandhead was identified in {sup 67}As. A transitional quadrupole moment of Q{sub 0}=-2.7(6) eb was deduced for the band built on the 9/2{sup +} isomer in {sup 69}Se, corresponding to a rigid oblate deformation of {beta}{sub 2}=-0.4(1), consistent with theoretical predictions. However, it appears that the relevant oblate configurations in {sup 69}Se and {sup 67}As are not nearly so favored as they are in {sup 68}Se, and are rapidly crossed by prolate configurations that form the high spin yrast lines.
- Research Organization:
- Argonne National Laboratory (ANL)
- Sponsoring Organization:
- NATO; SC; NSF; FOR
- DOE Contract Number:
- AC02-06CH11357
- OSTI ID:
- 949428
- Report Number(s):
- ANL/PHY/JA-40825
- Journal Information:
- Phys. Rev. C, Journal Name: Phys. Rev. C Journal Issue: 06 ; Dec. 2001 Vol. 64; ISSN 0556-2813; ISSN PRVCAN
- Country of Publication:
- United States
- Language:
- ENGLISH
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