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

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

University of Brighton

Research output: Contribution to journal › Article › peer-review

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 language	English
Journal	Physical Review C
Volume	66
Issue number	5
Publication status	Published - Nov 2002

Cite this

@article{e29c0ee35afb417abe0a40b5d11e5c11,

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

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.",

author = "C. Thwaites and C. Wheldon and Alison Bruce and P.M. Walker and G.D. Dracoulis and A.P. Byrne and T. Kib{\'e}di and F.G. Kondev and C.J. Pearson and C.S. Purry",

year = "2002",

month = nov,

language = "English",

volume = "66",

journal = "Physical Review C",

issn = "0556-2813",

publisher = "American Physical Society (APS)",

number = "5",

}

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

SN - 0556-2813

VL - 66

JO - Physical Review C

JF - Physical Review C

IS - 5

ER -

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

Abstract

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