Persistence of K isomerism in the N = 104 isotones: Observation of a high-seniority isomer in 75179Re

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

doi:10.1103/PhysRevC.66.054309

Persistence of K isomerism in the N = 104 isotones: Observation of a high-seniority isomer in ₇₅¹⁷⁹Re

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

^*Corresponding author for this work

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

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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 language	English
Article number	054309
Pages (from-to)	543091-5430922
Number of pages	4887832
Journal	Physical Review C - Nuclear Physics
Volume	66
Issue number	5
DOIs	https://doi.org/10.1103/PhysRevC.66.054309
Publication status	Published - 1 Nov 2002

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Thwaites, C., Wheldon, C., Brace, A. M., Walker, P. M., Dracoulis, G. D., Byrne, A. P., Kibédi, T., Kondev, F. G., Pearson, C. J., & Purry, C. S. (2002). Persistence of K isomerism in the N = 104 isotones: Observation of a high-seniority isomer in ₇₅¹⁷⁹Re. Physical Review C - Nuclear Physics, 66(5), 543091-5430922. Article 054309. https://doi.org/10.1103/PhysRevC.66.054309

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title = "Persistence of K isomerism in the N = 104 isotones: Observation of a high-seniority isomer in 75179Re",

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 Brace, {A. M.} and Walker, {P. M.} and Dracoulis, {G. D.} and Byrne, {A. P.} and T. Kib{\'e}di and Kondev, {F. G.} and Pearson, {C. J.} and Purry, {C. S.}",

year = "2002",

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doi = "10.1103/PhysRevC.66.054309",

language = "English",

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T1 - Persistence of K isomerism in the N = 104 isotones

T2 - Observation of a high-seniority isomer in 75179Re

AU - Thwaites, C.

AU - Wheldon, C.

AU - Brace, A. M.

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 - 2002/11/1

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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.

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DO - 10.1103/PhysRevC.66.054309

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JO - Physical Review C - Nuclear Physics

JF - Physical Review C - Nuclear Physics

IS - 5

M1 - 054309

ER -

Persistence of K isomerism in the N = 104 isotones: Observation of a high-seniority isomer in ₇₅¹⁷⁹Re

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