Level structure above the 17+ isomeric state in 15269Tm83

B.S. Nara Singh*, D.M. Cullen, M.J. Taylor, P.C. Srivastava, P. Van Isacker, O. Beeke, B. Dodson, David O'Donnell, U. Jakobson, T. Grahn, P.T. Greenlees, P.M. Jones, R. Julin, S. Khan, M. Leino, A.-P. Leppanen, S. Eeckhaudt, K. Mantyniemi, J. Pakarinen, P. PeuraP. Rahkila, J. Sarén, J. Sorri, J. Uusitalo, M. Venhart

*Corresponding author for this work

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Abstract

Excited states above the 17+ isomeric state in the proton-rich nucleus 152Tmwere established by employing the recoil-isomer tagging technique. Data were collected using the JUROGAM gamma-ray array and the GREAT spectrometer together with the recoil ion transport unit (RITU) gas-filled recoil separator and analyzed to identify the prompt and delayed γ decays from the levels in 152Tm. Shell-model calculations, either in a large valence space or in a reduced model space with five protons in the π0h11/2 orbital and one neutron in the ν1f7/2 orbital, agree with the observed energies of the yrast levels up to angular momentum J=21. The observation of near degeneracies in the energy spectrum can be attributed to specific components of the proton-neutron interaction. The isomeric decay of the 17+ level is not reproduced in the shell-model calculations as it arises from a delicate balance between hindrance due to seniority selection rules and enhancement due to configuration mixing.
Original languageEnglish
Article number024319
Number of pages11
JournalPhysical Review C
Volume98
Issue number2
DOIs
Publication statusPublished - 28 Aug 2018

Keywords

  • electromagnetic transitions
  • isomer decays
  • lifetimes and widths
  • nuclear forces
  • nuclear spin and parity
  • shell model

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