Multi-quasiparticle states and K -forbidden transitions in 183Os

T. Shizuma, K. Matsuura, Y. Toh, Y. Hayakawa, M. Oshima, Y. Hatsukawa, M. Matsuda, K. Furuno, Y. Sasaki, T. Komatsubara, Y. R. Shimizu

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19 Citations (Scopus)


High-spin states in 183Os have been studied using the 170Er(18O,5n) reaction at a beam energy of 85 MeV. Nine rotational bands based on 1-, 3-, 5- and 7-quasiparticle excitations have been observed. Nilsson configurations are assigned for the newly observed bands using g-factors deduced from M1/E2 branching ratios within the bands. In addition, two isomers with Kπ=(43/2+) and (43/2-) have been identified. The Kπ=(43/2+) isomer decays directly to the Kπ=9/2+ ground-state band with a large difference in the K quantum number, ΔK=17. The decay rates are discussed in terms of a tunneling model where high-K (isomeric) and low-K states interact via fluctuations towards triaxial nuclear shapes.

Original languageEnglish
Pages (from-to)337-370
Number of pages34
JournalNuclear Physics A
Issue number3-4
Publication statusPublished - Dec 31 2001

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics


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