Persistence of K isomerism in the N=104 isotones: observation of a high-seniority isomer in 179Re

C. Thwaites, C. Wheldon, Alison Bruce, P.M. Walker, G.D. Dracoulis, A.P. Byrne, T. Kibédi, F.G. Kondev, C.J. Pearson, C.S. Purry

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Abstract

The nuclear decay of 75179Re has been studied following the 165Ho(18O,4n)179Re and 173Yb(11B,5n)179Re reactions. Previously unobserved multiquasiparticle states have been identified in 75179Re, with highly K-forbidden decays. One of these, with a half-life of 466±15 μs, is the longest-lived high-seniority (>6) isomer yet discovered. This metastable state offers an opportunity to explore K isomerism as protons are added away from the midshell region. In addition, the excitation energies of several previously “floating” bands have been determined. Energies, lifetimes, configuration assignments, and g factors are discussed and compared to predictions of blocked BCS calculations.
Original languageEnglish
JournalPhysical Review C
Volume66
Issue number5
Publication statusPublished - Nov 2002

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isomers
decay
half life
metastable state
floating
life (durability)
protons
energy
configurations
predictions
excitation

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Thwaites, C., Wheldon, C., Bruce, A., Walker, P. M., Dracoulis, G. D., Byrne, A. P., ... Purry, C. S. (2002). Persistence of K isomerism in the N=104 isotones: observation of a high-seniority isomer in 179Re. Physical Review C, 66(5).
Thwaites, C. ; Wheldon, C. ; Bruce, Alison ; Walker, P.M. ; Dracoulis, G.D. ; Byrne, A.P. ; Kibédi, T. ; Kondev, F.G. ; Pearson, C.J. ; Purry, C.S. / Persistence of K isomerism in the N=104 isotones: observation of a high-seniority isomer in 179Re. In: Physical Review C. 2002 ; Vol. 66, No. 5.
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abstract = "The nuclear decay of 75179Re has been studied following the 165Ho(18O,4n)179Re and 173Yb(11B,5n)179Re reactions. Previously unobserved multiquasiparticle states have been identified in 75179Re, with highly K-forbidden decays. One of these, with a half-life of 466±15 μs, is the longest-lived high-seniority (>6) isomer yet discovered. This metastable state offers an opportunity to explore K isomerism as protons are added away from the midshell region. In addition, the excitation energies of several previously “floating” bands have been determined. Energies, lifetimes, configuration assignments, and g factors are discussed and compared to predictions of blocked BCS calculations.",
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Thwaites, C, Wheldon, C, Bruce, A, Walker, PM, Dracoulis, GD, Byrne, AP, Kibédi, T, Kondev, FG, Pearson, CJ & Purry, CS 2002, 'Persistence of K isomerism in the N=104 isotones: observation of a high-seniority isomer in 179Re', Physical Review C, vol. 66, no. 5.

Persistence of K isomerism in the N=104 isotones: observation of a high-seniority isomer in 179Re. / Thwaites, C.; Wheldon, C.; Bruce, Alison; Walker, P.M.; Dracoulis, G.D.; Byrne, A.P.; Kibédi, T.; Kondev, F.G.; Pearson, C.J.; Purry, C.S.

In: Physical Review C, Vol. 66, No. 5, 11.2002.

Research output: Contribution to journalArticleResearchpeer-review

TY - JOUR

T1 - Persistence of K isomerism in the N=104 isotones: observation of a high-seniority isomer in 179Re

AU - Thwaites, C.

AU - Wheldon, C.

AU - Bruce, Alison

AU - Walker, P.M.

AU - Dracoulis, G.D.

AU - Byrne, A.P.

AU - Kibédi, T.

AU - Kondev, F.G.

AU - Pearson, C.J.

AU - Purry, C.S.

PY - 2002/11

Y1 - 2002/11

N2 - The nuclear decay of 75179Re has been studied following the 165Ho(18O,4n)179Re and 173Yb(11B,5n)179Re reactions. Previously unobserved multiquasiparticle states have been identified in 75179Re, with highly K-forbidden decays. One of these, with a half-life of 466±15 μs, is the longest-lived high-seniority (>6) isomer yet discovered. This metastable state offers an opportunity to explore K isomerism as protons are added away from the midshell region. In addition, the excitation energies of several previously “floating” bands have been determined. Energies, lifetimes, configuration assignments, and g factors are discussed and compared to predictions of blocked BCS calculations.

AB - The nuclear decay of 75179Re has been studied following the 165Ho(18O,4n)179Re and 173Yb(11B,5n)179Re reactions. Previously unobserved multiquasiparticle states have been identified in 75179Re, with highly K-forbidden decays. One of these, with a half-life of 466±15 μs, is the longest-lived high-seniority (>6) isomer yet discovered. This metastable state offers an opportunity to explore K isomerism as protons are added away from the midshell region. In addition, the excitation energies of several previously “floating” bands have been determined. Energies, lifetimes, configuration assignments, and g factors are discussed and compared to predictions of blocked BCS calculations.

M3 - Article

VL - 66

JO - Physical Review C

JF - Physical Review C

SN - 0556-2813

IS - 5

ER -

Thwaites C, Wheldon C, Bruce A, Walker PM, Dracoulis GD, Byrne AP et al. Persistence of K isomerism in the N=104 isotones: observation of a high-seniority isomer in 179Re. Physical Review C. 2002 Nov;66(5).