Parity doubling in Th219 and the onset of collectivity above N=126

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

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Excited states in Th219 have been observed for the first time in an experiment using the Mg26+Pt198 reaction and evaporation-residue-gated γ-ray spectroscopy. Two structures of interlinked alternating-parity levels with simplex quantum numbers s=±i are observed, reminiscent of similar sequences in heavier odd-mass isotopes, but only three mass units away from the N=126 neutron closed shell. The emergence of quadrupole-octupole collectivity in this mass region and the trend for parity-doublet bands are discussed.

Original languageEnglish
Article number011304
JournalPhysical Review C - Nuclear Physics
Issue number1
StatePublished - Aug 6 2009


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