Abstract
High-spin states of have been populated using the reaction at a beam energy of 105 MeV. A new positive-parity side band with the same configuration as that of the yrast band is observed in . The properties of the two positive-parity bands show general agreement with the fingerprints of chiral rotation and thus these two bands are suggested to be candidates for near degenerate chiral doublet bands. Besides, odd-even spin staggering of the bands is studied systematically in odd-odd Cs, La, Pr, and Pm isotopes. As a result of this study we suggest that the spin value of lowest observed state of the yrast band be reassigned as 9 in . This new spin assignment is also supported by the argument of alignment additivity.
1 More- Received 18 October 2017
DOI:https://doi.org/10.1103/PhysRevC.97.014305
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