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Characterization of octupole-type structures in Th-221

Abstract : A detailed level scheme for Th-221 has been established in an experiment using the O-18 + Pb-207 reaction at 96 MeV. The evaporation residues from this fissile system were selected with the HERCULES detector array and residue-gated gamma 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 Th-223 (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.
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http://hal.in2p3.fr/in2p3-01096466
Contributor : Emilie Bonnardel <>
Submitted on : Wednesday, December 17, 2014 - 3:34:50 PM
Last modification on : Wednesday, September 16, 2020 - 5:33:30 PM

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W Reviol, Rvf Janssens, S Frauendorf, Dg Sarantites, Mp Carpenter, et al.. Characterization of octupole-type structures in Th-221. Physical Review C, American Physical Society, 2014, 90 (issue 4), pp.044318. ⟨10.1103/PhysRevC.90.044318⟩. ⟨in2p3-01096466⟩

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