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

Stolze, S.; Grahn, T.; Julin, R.; Joss, D.; Andgren, K.; Auranen, K.; Boenig, S.; Cox, D.; Darby, I.; Doncel, M.; Eeckhaudt, S.; Greenlees, P.; Hadinia, B.; Herzan, A.; Jakobsson, U.; Jones, P.; Juutinen, S.; Ketelhut, S.; Konki, J.; Kroell, T.; Leppanen, A-P; Nyman, M.; Page, R.; Pakarinen, J.; Partanen, J.; McPeake, C.; O'Donnell, D.; Peura, P.; Rahkila, P.; Ruotsalainen, P.; Sandzelius, M.; Saren, J.; Saygi, BAHADIR; Scholey, C.; Simpson, J.; Sorri, J.; Taylor, M.; Thornthwaite, A.; Uusitalo, J.

doi:10.1088/1361-6471/ac2889

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

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Stolze S., Grahn T., Julin R., Joss D. T., Andgren K., Auranen K., ...More

JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS, vol.48, no.12, 2021 (SCI-Expanded)

Publication Type: Article / Article
Volume: 48 Issue: 12
Publication Date: 2021
Doi Number: 10.1088/1361-6471/ac2889
Journal Name: JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS
Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, Aerospace Database, Chemical Abstracts Core, INSPEC, DIALNET
Keywords: mean lifetimes, RDDS measurements, gamma-ray spectroscopy, collectivity, single-particle states, electromagnetic transitions, DATA SHEETS, SHAPE COEXISTENCE, PLUNGER, STATES, GE
Ankara University Affiliated: No

Abstract

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