Persistence of <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mi>K</mi></math> isomerism in the <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mi>N</mi><mo>=</mo><mn>104</mn><mn></mn></math> isotones: Observation of a high-seniority isomer in <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msubsup><mrow></mrow><mrow><mi></mi><mi></mi><mn>75</mn></mrow><mrow><mn>179</mn></mrow></msubsup></mrow><mi mathvariant="normal">Re</mi></math>

C. Thwaites; C. Wheldon; A. M. Bruce; 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 $_{75}^{179} Re$

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

Phys. Rev. C 66, 054309 – Published 27 November 2002

Abstract

The nuclear decay of $_{75}^{179} Re$ has been studied following the $^{165} Ho (^{18} O {, 4 n)}^{179} Re$ and $^{173} Yb (^{11} B {, 5 n)}^{179} Re$ reactions. Previously unobserved multiquasiparticle states have been identified in $_{75}^{179} Re,$ 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.

Received 2 July 2002

DOI:https://doi.org/10.1103/PhysRevC.66.054309

Authors & Affiliations

C. Thwaites¹, C. Wheldon^2,3,*, A. M. Bruce¹, P. M. Walker², G. D. Dracoulis⁴, A. P. Byrne^4,5, T. Kibédi⁴, F. G. Kondev^4,†, C. J. Pearson², and C. S. Purry²

¹School of Engineering, University of Brighton, Brighton BN2 4GJ, United Kingdom
²Department of Physics, University of Surrey, Guildford, Surrey GU2 7XH, United Kingdom
³Department of Physics, Oliver Lodge Laboratory, University of Liverpool, Liverpool L69 7ZE, United Kingdom
⁴Department of Nuclear Physics, Research School of Physical Sciences and Engineering, The Australian National University, Canberra ACT 0200, Australia
⁵Joint appointment with Department of Physics, The Faculties, Australian National University, Canberra ACT 0200, Australia

^*Corresponding author. Electronic address: c.wheldon@surrey.ac.uk
^†Present address: Technology Development Division, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, IL 60439.

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Vol. 66, Iss. 5 — November 2002

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