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Tidal Waves and Onset of Collectivity above N = 126

Abstract : 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 Th-220 nucleus and the neighboring Ra-218 and Th-219 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.
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Contributor : Christine Hadrossek <>
Submitted on : Friday, May 27, 2011 - 5:12:02 PM
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W. Reviol, D.G. Sarantites, X. Chen, M. Montero, O.L. Pechenaya, et al.. Tidal Waves and Onset of Collectivity above N = 126. Conference on Nuclear Physics - Extremes of the Nuclear Landscape, Aug 2010, Zakopane, Poland. pp.671-680, ⟨10.5506/APhysPolB.42.671⟩. ⟨in2p3-00596541⟩



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