Tidal waves and onset of collectivity above N = 126

W. Reviol, D. G. Sarantites, X. Chen, M. Montero, O. L. Pechenaya, J. Snyder, R. V.F. Janssens, M. P. Carpenter, C. J. Chiara, T. L. Khoo, T. Lauritsen, C. J. Lister, D. Seweryniak, S. Zhu, K. Hauschild, A. Lopez-Martens, D. J. Hartley, S. Frauendorf

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Recent experiments in the actinide region, using Gammasphere and the evaporation residue detector HERCULES, have covered the territory between N = 126 and the center of static octupole deformation at N = 134. The 220Th nucleus and the neighboring 218Ra and 219Th nuclei mark the emergence of quadrupole-octupole collectivity in this mass region. Their octupole bands have B(E1)=B(E2) ratios which are typical for the region, but the level spacings do not concur with a rotational-like behavior. In addition, a spin-dependent staggering of the B(E1)=B(E2) ratios is evident. These features can be described, based on a phonon picture, by a constant-frequency tidal-wave mode for a reflection-asymmetric nuclear surface.

Original languageEnglish
Pages (from-to)671-680
Number of pages10
JournalActa Physica Polonica B
Issue number3-4
StatePublished - Mar 2011


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