Abstract
Structure of the |K ± 2| bands in doubly-odd nuclei belonging to the transitional deformation region at A∼190 is discussed. Relation of these quasi gamma-bands with the non-axial deformation of the parent two- quasiparticle configurations is studied. Using available experimental information, new tentative |K ± 2| bands are proposed in 188 Re, and 192,194 Ir nuclei. Coexistence of two-quasiparticle states with different deformation modes is considered in the case of 188 Re and 194 Ir.
Highlights
Nuclei of the transitional A∼190 region are characterized by core instability
Because of the complexity of experimental data related with the development of odd-odd nucleus level scheme, structure of these nuclei is not so well studied as in the case of their even-even, and odd-A neighbours
The best established gamma bands in doubly odd nuclei with A∼190 are: the 351.6 keV 2+ |K − 2| band in 192Ir [3, 4], based on the Kπ = 4+ (p:11/2[505]-n:3/2[512]) ground state configuration strongly mixed with the (p:3/2[402]n:11/2[615]) configuration, and the 2+ |K−2| band at 518.6 keV in 194Ir [5], based on the 147.1 keV 4+ level with the structure analogous to that of the 4+ ground state in 192Ir
Summary
Nuclei of the transitional A∼190 region are characterized by core instability. Shape phase transitions in the case of even-even nuclei have been a theme of extensive theoretical studies. Studies of nuclear shape transitional phenomena are hindered, first, by the complexity of theoretical description, and, second, by the lack of experimental data related with collective core excitations.
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