Structure and decay of a four-quasiparticle 15{sup {minus}} isomer in {sup 180}Ta

Journal Article · Fri Mar 01 04:00:00 EST 1996 · Physical Review, C

DOI:https://doi.org/10.1103/PhysRevC.53.1205· OSTI ID:279120

Dracoulis, G D; Kondev, F G; Byrne, A P; Kibedi, T; Bayer, S; Davidson, P M ^[1]; Walker, P M; Purry, C; Pearson, C J ^[2]

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1. Department of Nuclear Physics, RSPhysSE, Australian National University, Canberra ACT, 0200 (Australia)
2. Department of Physics, University of Surrey, Guildford, Surrey, GU2 5XH (England)

A four quasiparticle high-{ital K} isomer with a meanlife of 45(2) {mu}s has been identified at 1451 keV in {sup 180}Ta, populated in the {sup 176}Yb({sup 11}B,{alpha}3{ital n}){sup 180}Ta reaction. The isomer decays into a rotational band which is associated with the two-quasiparticle 9{sup {minus}} isomer at 75.3 keV. Analysis of the branching ratios within that band and the magnetic moment for the 9{sup {minus}} isomer, supports the configuration assignment to the 9{sup {minus}} isomer. The {ital K} hindrance for the {ital E}2 decay of the 15{sup {minus}} isomer to the 9{sup {minus}} band is substantially lower than that for an apparently similar 15{sup {minus}} isomer in {sup 178}Ta, a difference which can be attributed partly to a change from the {pi}9/2{sup {minus}}[514]{nu}{sup 3}9/2{sup +} [624]7/2{sup {minus}}[514]5/2{sup {minus}}[512] configuration in {sup 178}Ta to the {pi}{sup 3}9/2{sup {minus}}[514]7/2{sup +}[404]5/2{sup +}[402]{nu}9/2{sup +}[624] configuration in {sup 180}Ta. The reduced hindrance factors for {ital E}2 decays from related four-quasiparticle isomers in the isotopes {sup 176,178,180}Ta match the hindrances of the corresponding {ital E}2 decays from component 6{sup +} core states in the hafnium isotopes, {sup 174,176,178}Hf. {copyright} {ital 1996 The American Physical Society.}

• OSTI ID: 279120
• Journal Information: Physical Review, C, Journal Name: Physical Review, C Journal Issue: 3 Vol. 53; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
ALPHA PARTICLES
BORON 11 REACTIONS
GAMMA SPECTRA
ISOMERS
MEV RANGE 10-100
NEUTRONS
QUASI PARTICLES
STRIPPING
TANTALUM 180
TANTALUM ISOTOPES
YTTERBIUM 176 TARGET