Candidate chiral doublet bands in 138Pm.

Authors :: Ma, K. Y.
Lu, J. B.
Zhang, Z.
Liu, J. Q.
Yang, D.
Liu, Y. M.
Xu, X.
Li, X. Y.
Liu, Y. Z.
Wu, X. G.
Zheng, Y.
Li, C. B.
Source :: Physical Review C. Jan2018, Vol. 97 Issue 1, p1-1. 1p.
Publication Year :: 2018
Abstract: High-spin states of 138Pm have been populated using the 124Te(19F,5n)138Pm reaction at a beam energy of 105 MeV. A new positive-parity side band with the same πh11/2⊗νh11/2 configuration as that of the yrast band is observed in 138Pm. 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 πh11/2⊗νh11/2 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 138Pm. This new spin assignment is also supported by the argument of alignment additivity. [ABSTRACT FROM AUTHOR]