Abstract
The observed low-lying K=5/2±positive-and negative-parity bands in the stable nucleus 153Eu are in-vestigated using the reflection-asymmetric triaxial particle rotor model.The experimental energy spectra,energy staggering parameters,and intraband E2 and Ml transition probabilities are well reproduced.The calculated interb-and B(E1)values are found to depend sensitively on the octupole deformation parameter β30,although the energy spectra and intraband E2 and Ml transitions can be reproduced without the octupole degree of freedom.The ob-served enhanced E1 transition probabilities can be reproduced with β30=0.05.The detailed analysis of the intrinsic wave functions shows these nearly degenerate positive-and negative-parity bands are built on two individual proton configurations,i.e.,dominated by πg7/2[Ω=5/2]and πh11/2[Ω=5/2],respectively,which differs from the parity doublet bands built on a single parity-mixed configuration.
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