1. Coexistence of triaxial and prolate shapes in Ir-171
- Author
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Bark, R A, Tormanen, S, Bäck, Torbjörn, Cederwall, Bo, Odegard, S W, Cocks, J F C, Helariutta, K, Jones, P, Julin, R, Juutinen, S, Kankaanpaa, H, Kettunen, H, Kuusiniemi, P, Leino, M, Muikku, M, Rahkila, P, Savelius, A, Bergstrom, M, Ingebretsen, F, Maj, A, Mattiuzzi, M, Mueller, W, Riedinger, L L, Saitoh, T, Tjom, P O, Bark, R A, Tormanen, S, Bäck, Torbjörn, Cederwall, Bo, Odegard, S W, Cocks, J F C, Helariutta, K, Jones, P, Julin, R, Juutinen, S, Kankaanpaa, H, Kettunen, H, Kuusiniemi, P, Leino, M, Muikku, M, Rahkila, P, Savelius, A, Bergstrom, M, Ingebretsen, F, Maj, A, Mattiuzzi, M, Mueller, W, Riedinger, L L, Saitoh, T, and Tjom, P O
- Abstract
Excited states in Ir-171 have been observed for the first time. Gamma-rays were assigned to the nucleus by the recoil-decay tagging method, The ground-state band has a structure consistent with an h(11/2) proton coupled to a core of large triaxial deformation. At high spins, a bandcrossing occurs which is interpreted as a change in shape to a prolate deformation, Band-mixing calculations are performed for Ir171-175. These show that shape-coexistence between triaxial and prolate states in these nuclei follows the same systematics found in their Pt and Os neighbours. The systematics are also compared with deformations calculated for Ir171-179 using the code "Ultimate Cranker". Dipole bands were also observed, but tilted axis cranking calculations suggest that they are associated with a collective rotation., NV 20160114
- Published
- 1999
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