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, Yoshifumi Shimizu

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Abstract

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
Volume696
Issue number3-4
DOIs
Publication statusPublished - Dec 31 2001

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forbidden transitions
isomers
quantum numbers
decay rates
ground state
decay
configurations
excitation
energy

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics

Cite this

Shizuma, T., Matsuura, K., Toh, Y., Hayakawa, Y., Oshima, M., Hatsukawa, Y., ... Shimizu, Y. (2001). Multi-quasiparticle states and K -forbidden transitions in 183Os. Nuclear Physics A, 696(3-4), 337-370. https://doi.org/10.1016/S0375-9474(01)01210-6

Multi-quasiparticle states and K -forbidden transitions in 183Os. / Shizuma, T.; Matsuura, K.; Toh, Y.; Hayakawa, Y.; Oshima, M.; Hatsukawa, Y.; Matsuda, M.; Furuno, K.; Sasaki, Y.; Komatsubara, T.; Shimizu, Yoshifumi.

In: Nuclear Physics A, Vol. 696, No. 3-4, 31.12.2001, p. 337-370.

Research output: Contribution to journal › Article

Shizuma, T, Matsuura, K, Toh, Y, Hayakawa, Y, Oshima, M, Hatsukawa, Y, Matsuda, M, Furuno, K, Sasaki, Y, Komatsubara, T & Shimizu, Y 2001, 'Multi-quasiparticle states and K -forbidden transitions in 183Os', Nuclear Physics A, vol. 696, no. 3-4, pp. 337-370. https://doi.org/10.1016/S0375-9474(01)01210-6
Shizuma T, Matsuura K, Toh Y, Hayakawa Y, Oshima M, Hatsukawa Y et al. Multi-quasiparticle states and K -forbidden transitions in 183Os. Nuclear Physics A. 2001 Dec 31;696(3-4):337-370. https://doi.org/10.1016/S0375-9474(01)01210-6
Shizuma, T. ; Matsuura, K. ; Toh, Y. ; Hayakawa, Y. ; Oshima, M. ; Hatsukawa, Y. ; Matsuda, M. ; Furuno, K. ; Sasaki, Y. ; Komatsubara, T. ; Shimizu, Yoshifumi. / Multi-quasiparticle states and K -forbidden transitions in 183Os. In: Nuclear Physics A. 2001 ; Vol. 696, No. 3-4. pp. 337-370.
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AU - Matsuda, M.

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AB - 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.

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