Fast decay of a three-quasiparticle isomer in $^{171}\mathrm{Tm}$

Fast decay of a three-quasiparticle isomer in ${}^{171}{Tm}$

P. M. Walker, R. J. Wood, G. D. Dracoulis, T. Kibédi, R. A. Bark, A. M. Bruce, A. P. Byrne, P. M. Davidson, H. M. El-Masri, G. J. Lane, C. Moon, J. N. Orce, F. M. Prados Estevéz, C. Wheldon, and A. N. Wilson

Phys. Rev. C 79, 044321 – Published 24 April 2009

Abstract

Incomplete-fusion reactions have been used to study high-spin states in ${}^{171}{Tm}$ . Gamma rays and conversion electrons were measured using pulsed-beam conditions for enhanced isomer sensitivity. A $K^{π} = 19 / 2^{+}$ , three-quasiparticle isomer was identified, with a half-life of $1.7 (2)$ μs. The faster than expected transition rates from the isomer can be understood as being due to a chance near-degeneracy, with mixing between the isomeric state and the $I^{π} = 19 / 2^{+}$ member of the one-quasiparticle rotational band to which it decays. The implied mixing matrix element is $12 (2)$ eV.

Received 3 March 2009

DOI:https://doi.org/10.1103/PhysRevC.79.044321

Authors & Affiliations

P. M. Walker^1,*, R. J. Wood¹, G. D. Dracoulis², T. Kibédi², R. A. Bark^2,†, A. M. Bruce³, A. P. Byrne^2,4, P. M. Davidson², H. M. El-Masri¹, G. J. Lane², C. Moon^2,‡, J. N. Orce^3,§, F. M. Prados Estevéz³, C. Wheldon^1,∥, and A. N. Wilson^2,4

¹Department of Physics, University of Surrey, Guildford, Surrey GU2 7XH, United Kingdom
²Department of Nuclear Physics, RSPhysSE, Australian National University, Canberra ACT0200, Australia
³School of Environment and Technology, University of Brighton, Brighton BN2 4GJ, United Kingdom
⁴Department of Physics, Australian National University, Canberra ACT0200, Australia

^*p.walker@surrey.ac.uk
^†Present address: iThemba LABS, PO Box 722, Somerset West 7129, South Africa.
^‡Present address: Department of Display Engineering, Hoseo University, Chung-Nam 336-795, Korea.
^§Present address: TRIUMF, 4004 Wesbrook Mall, Vancouver, BC V6T 2A3, Canada.
^∥Present address: School of Physics and Astronomy, University of Birmingham, Birmingham B15 2TT, United Kingdom.

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Vol. 79, Iss. 4 — April 2009

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Physical Review C

covering nuclear physics

Fast decay of a three-quasiparticle isomer in ${}^{171}{Tm}$

P. M. Walker, R. J. Wood, G. D. Dracoulis, T. Kibédi, R. A. Bark, A. M. Bruce, A. P. Byrne, P. M. Davidson, H. M. El-Masri, G. J. Lane, C. Moon, J. N. Orce, F. M. Prados Estevéz, C. Wheldon, and A. N. Wilson

Phys. Rev. C 79, 044321 – Published 24 April 2009

Abstract

Authors & Affiliations

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Physical Review C

covering nuclear physics

Fast decay of a three-quasiparticle isomer in Tm171

P. M. Walker, R. J. Wood, G. D. Dracoulis, T. Kibédi, R. A. Bark, A. M. Bruce, A. P. Byrne, P. M. Davidson, H. M. El-Masri, G. J. Lane, C. Moon, J. N. Orce, F. M. Prados Estevéz, C. Wheldon, and A. N. Wilson

Phys. Rev. C 79, 044321 – Published 24 April 2009

Abstract

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Fast decay of a three-quasiparticle isomer in ${}^{171}{Tm}$