Multiple octupole-type band structures in Th220: Reflection-asymmetric tidal waves?

W. Reviol, C. J. Chiara, M. Montero, D. G. Sarantites, O. L. Pechenaya, M. P. Carpenter, R. V.F. Janssens, T. L. Khoo, T. Lauritsen, C. J. Lister, D. Seweryniak, S. Zhu, S. G. Frauendorf

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Abstract

The Th220 level scheme has been considerably extended from an experiment using the Mg26+Pt198 reaction at 128 MeV. The evaporation residues from this very fissile system were selected with the HERCULES detector system and residue-gated γ rays were measured with Gammasphere. The simplex feature (alternating-parity levels) persists up to the highest spins observed (23), but the nucleus exhibits a more vibrational-like behavior than the heavier Th isotopes. In addition, a doubling of the negative-parity, odd-spin states is seen as well as a staggering of the B(E1)/B(E2) ratios. A new interpretation based on a picture of tidal waves on a reflection-asymmetric nuclear surface is proposed.

Original languageEnglish
Article number044305
JournalPhysical Review C - Nuclear Physics
Volume74
Issue number4
DOIs
StatePublished - Jan 1 2006

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    Reviol, W., Chiara, C. J., Montero, M., Sarantites, D. G., Pechenaya, O. L., Carpenter, M. P., Janssens, R. V. F., Khoo, T. L., Lauritsen, T., Lister, C. J., Seweryniak, D., Zhu, S., & Frauendorf, S. G. (2006). Multiple octupole-type band structures in Th220: Reflection-asymmetric tidal waves? Physical Review C - Nuclear Physics, 74(4), [044305]. https://doi.org/10.1103/PhysRevC.74.044305