High-K isomers and rotational structures in W174

S. K. Tandel, P. Chowdhury, E. H. Seabury, I. Ahmad, M. P. Carpenter, S. M. Fischer, R. V.F. Janssens, T. L. Khoo, T. Lauritsen, C. J. Lister, D. Seweryniak, Y. R. Shimizu

研究成果: ジャーナルへの寄稿学術誌査読

29 被引用数 (Scopus)


High-spin states in W174 (Z = 74) have been populated using the reaction Te128(Ti50, 4n)W174 at beam energies of 215 and 225 MeV. The Gammasphere array was used to detect the γ rays emitted by the evaporation residues. Four previously known collective band structures have been extended, and 16 new rotational sequences observed. Two are built upon isomeric states, one corresponding to a two-quasiparticle K = 8 isomer, the other to a four-quasiparticle K = 12 isomer, with the latter exhibiting strong K-violating ΔK=12 decays to the ground state band. Nucleonic configurations for the two- and four-quasiparticle excitations are proposed, and Woods-Saxon cranking calculations are presented to understand the rotational structures. Decay mechanisms of multi-quasiparticle K isomers are discussed in terms of the prevalent phenomenological models, with special emphasis on γ-tunneling calculations. Surprisingly, the latter underpredict the decay hindrance for the K = 12 isomer by three orders of magnitude, unlike all other isomer decays in this mass region.

ジャーナルPhysical Review C - Nuclear Physics
出版ステータス出版済み - 2006

!!!All Science Journal Classification (ASJC) codes

  • 核物理学および高エネルギー物理学


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