Published January 1, 2019 | Version v1
Journal article Open

Lifetime measurements of excited states in W-163 and the implications for the anomalous B(E2) ratios in transitional nuclei

Creators

  • 1. Univ Liverpool, Dept Phys, Oliver Lodge Lab, Liverpool L69 7ZE, Merseyside, England
  • 2. Ege Univ, Fiz Bolumu, Fen Fak, TR-35100 Izmir, Turkey
  • 3. Univ Manchester, Sch Phys & Astron, Schuster Bldg, Manchester M13 9PL, Lancs, England
  • 4. UKRI STFC Daresbury Lab, Warrington WA4 4AD, Cheshire, England
  • 5. Univ Jyvaskyla, Dept Phys, POB 35, FI-40014 Jyvaskyla, Finland
  • 6. Univ Cologne, Inst Kernphys, Zulpicher Str 77, D-50937 Cologne, Germany
  • 7. Tech Univ Darmstadt, Inst Kernphys, Schlossgartenstr 9, D-64289 Darmstadt, Germany

Description

This letter reports lifetime measurements of excited states in the odd-N nucleus W-163 using the recoil-distance Doppler shift method to probe the core polarising effect of the i(13/2) neutron orbital on the underlying soft triaxial even-even core. The ratio B(E2:21/2(+) -> 17/2(+))/B(E2:17/2(+) -> 13/2(+)) is consistent with the predictions of the collective rotational model. The deduced B(E2) values provide insights into the validity of collective model predictions for heavy transitional nuclei and a geometric origin for the anomalous B(E2) ratios observed in nearby even-even nuclei is proposed. (C) 2019 The Authors. Published by Elsevier B.V.

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