Lifetime measurements of excited states in 
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 and 
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 and the evolution of collectivity in rare-earth nuclei

Doncel, M.; Cederwall, B.; Qi, Chong; Li, H.; Jakobsson, U.; Auranen, K.; Bönig, S.; Drummond, M. C.; Grahn, T.; Greenlees, P. T.; Herzáň, A.; Joss, D. T.; Julin, R.; Juutinen, S.; Konki, J.; Kroll, Thilo; Leino, M.; McPeake, C.; O’Donnell, D.; Page, R. D.; Pakarinen, J.; Partanen, J.; Peura, P.; Rahkila, P.; Ruotsalainen, P.; Sandzelius, M.; Sarén, J.; Sayğı, B.; Scholey, C.; Sorri, J.; Stolze, Sanna; Taylor, M. J.; Thornthwaite, A.; Uusitalo, J.

doi:10.1103/physrevc.95.044321

Cited by 6 publications

(1 citation statement)

References 45 publications

(68 reference statements)

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“…These features are hard to reconcile with theoretical calculations, which often predict higher B(E2; 2 + → 0 + ) and B(E2; 4 + → 2 + ) values. However, it is noted that recent theoretical calculations employing the Skyrme Hartree-Fock-Bogoliubov calculations with the Sly4 and UNEDF02 parameters in the transformed harmonic oscillator basis appear to reproduce the low collectivity of the 2 + → 0 + transition observed in the present work [41]. These predictions are promising albeit with the caveat that the model predicts B(E2) values based on quadrupole deformation parameters calculated using the collective rotational model.…”

Section: Discussionsupporting

confidence: 55%

Single-particle and collective excitations in the transitional nucleus ¹⁶⁶Os

Stolze¹,

Grahn²,

Julin³

et al. 2021

J. Phys. G: Nucl. Part. Phys.

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The mean lifetimes of the lowest energy 2 + , 8 + and 9 − states in 166 Os have been measured using the recoil distance Doppler-shift method in conjunction with a selective recoil-decay tagging technique. These measurements extend studies into the most neutron-deficient mass region accessible to current experimental methods. The B(E2; 2 + → 0 + ) = 7(2) W.u. extracted from these measurements is markedly lower than those observed in the heavier even-mass Os isotopes. The 8 + and 9 − states yield reduced transition probabilities that are consistent with single-particle transitions. While these values may indicate a departure from collective structure, the level scheme and the underlying nuclear configurations can also be interpreted in terms of a simple collective picture. This contrasting behaviour suggests an intriguing dichotomy in the description of heavy transitional nuclei.

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Section: Discussionsupporting

confidence: 55%