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, Yoshifumi Shimizu

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Abstract

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.

Original languageEnglish
Article number044306
JournalPhysical Review C - Nuclear Physics
Volume73
Issue number4
DOIs
Publication statusPublished - Jan 1 2006

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics

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    Tandel, S. K., Chowdhury, P., Seabury, E. H., Ahmad, I., Carpenter, M. P., Fischer, S. M., Janssens, R. V. F., Khoo, T. L., Lauritsen, T., Lister, C. J., Seweryniak, D., & Shimizu, Y. (2006). High-K isomers and rotational structures in W174. Physical Review C - Nuclear Physics, 73(4), [044306]. https://doi.org/10.1103/PhysRevC.73.044306