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

Stolze, S, Grahn, T, Julin, R, Joss, DT ORCID: 0000-0001-5763-8767, Andgren, K, Auranen, K, Boenig, S, Cox, D, Darby, IG, Doncel, M
et al (show 29 more authors) (2021) Single-particle and collective excitations in the transitional nucleus Os-166. JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS, 48 (12). p. 125101.

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The mean lifetimes of the lowest energy 2+, 8+ and 9- states in 166Os 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.

Item Type: Article
Uncontrolled Keywords: mean lifetimes, RDDS measurements, gamma-ray spectroscopy, collectivity, single-particle states, electromagnetic transitions
Divisions: Faculty of Science and Engineering > School of Physical Sciences
Depositing User: Symplectic Admin
Date Deposited: 25 Oct 2021 10:04
Last Modified: 18 Jan 2023 21:25
DOI: 10.1088/1361-6471/ac2889
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