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

Lewis, M.; Joss, D.; SAYGI, BAHADIR; Page, R.; Cullen, D.; Barber, L.; Giles, M.; Simpson, J.; Al-Aqeel, M.; Badran, H.; Braunroth, T.; Briscoe, A.; Calverley, T.; Dewald, A.; Doncel, M.; Grahn, T.; Greenlees, P.; Henrich, C.; Herzan, A.; Herzberg, R-D; Higgins, E.; Hilton, J.; Ilieva, S.; Julin, R.; Juutinen, S.; Keatings, J.; Kroell, T.; Labiche, M.; Mashtakov, K.; Singh, B.; Parr, E.; Partanen, J.; Paul, E.; Rahkila, P.; Sandzelius, M.; Saren, J.; Scholey, C.; Siciliano, M.; Spagnoletti, P.; Stolze, S.; Szwec, Sv; Taylor, M.; Uusitalo, J.

doi:10.1016/j.physletb.2019.134998

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 (SCI-Expanded, Scopus)

Publication Type: Article / Article
Volume: 798
Publication Date: 2019
Doi Number: 10.1016/j.physletb.2019.134998
Journal Name: PHYSICS LETTERS B
Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
Keywords: Mean lifetimes, B(E2) reduced transition probabilities, Recoil-distance Doppler-shift method, Nuclear deformation, Gamma-ray Spectroscopy, DECAY CURVE METHOD, DATA SHEETS, SPECTROSCOPY, PLUNGER, GE
Ankara University Affiliated: No

Abstract

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.