Single-particle and collective excitations in the transitional nucleus 166Os. (11th October 2021)

• Record Type: Journal Article
• Authors: Stolze, S; Grahn, T; Julin, R; Joss, D T; Andgren, K; Auranen, K; Bönig, S; Cox, D; Darby, I G; Doncel, M; Eeckhaudt, S; Greenlees, P T; Hadinia, B; Herzáň, A; Jakobsson, U; Jones, P; Juutinen, S; Ketelhut, S; Konki, J; Kröll, T; Leppänen, A-P; Nyman, M; Page, R D; Pakarinen, J; Partanen, J; McPeake, C G; O'Donnell, D; Peura, P; Rahkila, P; Ruotsalainen, P; Sandzelius, M; Sarén, J; Saygı, B; Scholey, C; Simpson, J; Sorri, J; Taylor, M J; Thornthwaite, A; Uusitalo, J;
• Is Part Of: Journal of physics. Volume 48:Number 12(2021)
• Publication Date: 2021-10-11
• Subjects: mean lifetimes -- RDDS measurements -- gamma-ray spectroscopy -- collectivity -- single-particle states -- electromagnetic transitions; Nuclear physics -- Periodicals; Particles (Nuclear physics) -- Periodicals; Physique nucléaire -- Périodiques; Particules (Physique nucléaire) -- Périodiques; Kernfysica; Elementaire deeltjes; 539.7
• DOI: 10.1088/1361-6471/ac2889
• Languages: English
• ISSNs: 0954-3899

Abstract

Abstract: 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 ( E 2; 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.