K-hindered decay of a six-quasiparticle isomer in {sup 176}Hf.

Journal Article · Mon Nov 29 04:00:00 EST 2010 · Phys. Rev. C

DOI:https://doi.org/10.1103/PhysRevC.82.054316· OSTI ID:1014817

Mukherjee, G; Chowdhury, P; Kondev, F G; Walker, P M; Dracoulis, G D; Ahmad, I; Carpenter, M P; Janssens, R V. F.; Khoo, T L; Lauritsen, T; Lister, C J; Seweryniak, D ^[1]

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1. Nuclear Engineering Division

The structure and decay properties of high-K isomers in {sup 176}Hf have been studied using beam sweeping techniques and the Gammasphere multidetector array. A new {Delta}K = 8 decay branch, from a K{sup {pi}} = 22{sup -}, six-quasiparticle, isomeric (t{sub 1/2} = 43 {micro}s) state at 4864 keV to the 20{sup -} state of a K{sup {pi}} = 14{sup -} band, has been identified. The reduced hindrance factor per degree of K forbiddenness for this decay is measured to be unusually low (f{sub ?} = 3.2), which suggests K mixing in the states involved. The deduced interaction matrix elements are discussed within the context of relevant K-mixing scenarios. The 3266-keV state, previously interpreted as a K{sup {pi}} = 16{sup +} intrinsic state, is reassigned as the J{sup {pi}} = 16{sup +} member of the band based on the K{sup {pi}} = 15{sup +} state at 3080 keV. The systematics of f{sub ?} values as a function of the degree of forbiddenness is discussed in light of this change.

• Research Organization: Argonne National Laboratory (ANL)
• Sponsoring Organization: SC; NSF
• DOE Contract Number: AC02-06CH11357
• OSTI ID: 1014817
• Report Number(s): ANL/PHY/JA-67757
• Journal Information: Phys. Rev. C, Journal Name: Phys. Rev. C Journal Issue: Nov. 29, 2010 Vol. 82; ISSN 0556-2813
• Country of Publication: United States
• Language: ENGLISH

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
DECAY
ISOMERS
MATRIX ELEMENTS