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

M.C. Lewis, D.T. Joss*, B. Saygi, R.D. Page, D.M. Cullen, L. Barber, M.M. Giles, J. Simpson, M.A.M. Al-Aqeel, H. Badran, T. Braunroth, A.D. Briscoe, T. Calverley, A. Dewald, M. Doncel, T. Grahn, P.T. Greenlees, C. Henrich, A. Herzáň, R.-D. HerzbergE. Higgins, J. Hilton, S. Ilieva, R. Julin, S. Juutinen, J. Keatings, T. Kröll, Marc Labiche, K. Mashtakov, B.S. Nara Singh, E. Parr, J. Partanen, E.S. Paul, P. Rahkila, M. Sandzelius, J. Saren, C. Scholey, M. Siciliano, P. Spagnoletti, S. Stolze, S.V. Szwec, M.J. Taylor, J. Uusitalo

*Corresponding author for this work

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Abstract

This letter reports lifetime measurements of excited states in the odd-N nucleus 163W using the recoil-distance Doppler shift method to probe the core polarising effect of the i13/2 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.
Original languageEnglish
Article number134998
Number of pages5
JournalPhysics Letters B
Volume798
Early online date7 Oct 2019
DOIs
Publication statusPublished - 10 Nov 2019

Keywords

  • Mean lifetimes
  • B(E2) reduced transition probabilities
  • Recoil-distance Doppler-shift method
  • Nuclear deformation
  • Gamma-ray Spectroscopy

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    Lewis, M. C., Joss, D. T., Saygi, B., Page, R. D., Cullen, D. M., Barber, L., Giles, M. M., Simpson, J., Al-Aqeel, M. A. M., Badran, H., Braunroth, T., Briscoe, A. D., Calverley, T., Dewald, A., Doncel, M., Grahn, T., Greenlees, P. T., Henrich, C., Herzáň, A., ... Uusitalo, J. (2019). Lifetime measurements of excited states in 163W and the implications for the anomalous B(E2) ratios in transitional nuclei. Physics Letters B, 798, [134998]. https://doi.org/10.1016/j.physletb.2019.134998