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

Lewis M. C. , Joss D. T. , SAYGI B. , Page R. D. , Cullen D. M. , Barber L., ...More

PHYSICS LETTERS B, vol.798, 2019 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 798
  • Publication Date: 2019
  • Doi Number: 10.1016/j.physletb.2019.134998
  • Title of Journal : PHYSICS LETTERS B


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.