Characterization of octupole-type structures in Th 221

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

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A detailed level scheme for Th221 has been established in an experiment using the O18+207Pb reaction at 96 MeV. The evaporation residues from this fissile system were selected with the HERCULES detector array and residue-gated γ rays were measured with Gammasphere. Three band structures of interlinked, alternating-parity levels are observed, two of which are non-yrast. In addition, several high-lying excitations are found. The yrast band is seen up to spin-parity 37/2- and 39/2+, beyond which a high-spin feeding transition is observed. The non-yrast sequences are interpreted as parity-doublet structures, based on a configuration similar to that of the yrast band in Th223 (K=5/2). The key properties of even-odd nuclei in this mass region [B(E1)/B(E2) and B(M1)/B(E2) ratios, spin alignments, parity splittings] are reviewed.

Original languageEnglish
Article number044318
JournalPhysical Review C - Nuclear Physics
Issue number4
StatePublished - Oct 21 2014


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