Lifetime measurements of excited states in 163W and the implications for the anomalous B(E2) ratios in transitional nuclei
oleh: M.C. Lewis, D.T. Joss, B. Sayğı, 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. Herzberg, E. Higgins, J. Hilton, S. Ilieva, R. Julin, S. Juutinen, J. Keatings, T. Kröll, M. Labiche, K. Mashtakov, B.S. Nara Singh, E. Parr, J. Partanen, E.S. Paul, P. Rahkila, M. Sandzelius, J. Sarén, C. Scholey, M. Siciliano, P. Spagnoletti, S. Stolze, S.V. Szwec, M.J. Taylor, J. Uusitalo
| Format: | Article |
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| Diterbitkan: | Elsevier 2019-11-01 |
Deskripsi
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. Keywords: Mean lifetimes, B(E2) reduced transition probabilities, Recoil-distance Doppler-shift method, Nuclear deformation, Gamma-ray Spectroscopy