$\ensuremath{\gamma}$-ray spectroscopy of a four-quasiparticle isomer band in $^{174}\mathrm{Re}$

$γ$ -ray spectroscopy of a four-quasiparticle isomer band in ${}^{174}{Re}$

R. J. Carroll, P. M. Walker, G. J. Lane, M. W. Reed, A. Akber, H. M. Albers, J. J. Carroll, D. M. Cullen, A. C. Dai, C. Fahlander, M. S. M. Gerathy, S. S. Hota, G. Lotay, T. Kibédi, V. Margerin, A. J. Mitchell, N. Palalani, T. Palazzo, Z. Patel, R. Shearman, A. E. Stuchbery, and F. R. Xu

Phys. Rev. C 101, 054314 – Published 26 May 2020

Abstract

Excited states in ${}^{174}{Re}$ have been populated in fusion-evaporation reactions at the Australian National University, and $γ$ -ray spectroscopy has been used to determine the level structure and to deduce the underlying nucleon configurations. The half-life of the bandhead of the $K^{π} = 8^{-}$ band has been measured to be 2.7(4) ns. A band built on an isomeric state of spin-parity ( $14^{-}$ ) and a half-life of 53(5) ns has been observed here for the first time, and has been determined to have a four-quasiparticle structure. Contrasting reduced-hindrance values for its decay are discussed in terms of deformation and configuration changes, as indicated by configuration-constrained potential energy surface calculations.

Received 10 November 2019
Revised 10 March 2020
Accepted 22 April 2020

DOI:https://doi.org/10.1103/PhysRevC.101.054314

Physics Subject Headings (PhySH)

Collective levels Electromagnetic transitions Isomer decays Lifetimes & widths Nuclear structure & decays

150 ≤ A ≤ 189

Nuclear Physics

Authors & Affiliations

R. J. Carroll ¹, P. M. Walker¹, G. J. Lane², M. W. Reed², A. Akber², H. M. Albers³, J. J. Carroll ⁴, D. M. Cullen⁵, A. C. Dai⁶, C. Fahlander ⁷, M. S. M. Gerathy², S. S. Hota², G. Lotay¹, T. Kibédi ², V. Margerin⁸, A. J. Mitchell ², N. Palalani², T. Palazzo², Z. Patel¹, R. Shearman^1,9, A. E. Stuchbery ², and F. R. Xu⁶

¹Department of Physics, University of Surrey, Guildford GU2 7XH, United Kingdom
²Department of Nuclear Physics, R.S.P.E, Australian National University, Canberra ACT 2601, Australia
³GSI Helmholtzzentrum für Schwerionenforschung GmbH, Planckstrasse 1, 64291 Darmstadt, Germany
⁴CCDC/Army Research Laboratory, 2800 Powder Mill Road, Adelphi, Maryland 20783, USA
⁵School of Physics and Astronomy, Schuster Building, University of Manchester, Manchester M13 9PL, United Kingdom
⁶State Key Laboratory of Nuclear Physics and Technology, School of Physics, Peking University, Beijing 100871, China
⁷Department of Physics, Lund University, 22100 Lund, Sweden
⁸School of Physics and Astronomy, University of Edinburgh, Edinburgh EH9 3FD, United Kingdom
⁹National Physical Laboratory, Teddington, Middlesex TW11 0LW, United Kingdom

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Vol. 101, Iss. 5 — May 2020

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Physical Review C

covering nuclear physics

$γ$ -ray spectroscopy of a four-quasiparticle isomer band in ${}^{174}{Re}$

R. J. Carroll, P. M. Walker, G. J. Lane, M. W. Reed, A. Akber, H. M. Albers, J. J. Carroll, D. M. Cullen, A. C. Dai, C. Fahlander, M. S. M. Gerathy, S. S. Hota, G. Lotay, T. Kibédi, V. Margerin, A. J. Mitchell, N. Palalani, T. Palazzo, Z. Patel, R. Shearman, A. E. Stuchbery, and F. R. Xu

Phys. Rev. C 101, 054314 – Published 26 May 2020

Abstract

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Physical Review C

covering nuclear physics

γ-ray spectroscopy of a four-quasiparticle isomer band in Re174

R. J. Carroll, P. M. Walker, G. J. Lane, M. W. Reed, A. Akber, H. M. Albers, J. J. Carroll, D. M. Cullen, A. C. Dai, C. Fahlander, M. S. M. Gerathy, S. S. Hota, G. Lotay, T. Kibédi, V. Margerin, A. J. Mitchell, N. Palalani, T. Palazzo, Z. Patel, R. Shearman, A. E. Stuchbery, and F. R. Xu

Phys. Rev. C 101, 054314 – Published 26 May 2020

Abstract

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$γ$ -ray spectroscopy of a four-quasiparticle isomer band in ${}^{174}{Re}$