Triaxial Shape,Signature Splitting,and Shape Coexistence in 127,129,131Nd |
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| Authors: | DONG Bao-Guo MA Hai-Liang YAN Yu-Liang |
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| Affiliation: | 1. Department of Nuclear Physics, China Institute of Atomic Energy, P.O. Box 275 (18), Beijing 102413, China;2. Center of Theoretical Nuclear Physics, National Laboratory of Heavy Ion Collisions, Lanzhou 730000, China |
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| Abstract: | Signature splitting and shape coexistence at high spin in the neutrondeficient nucleus 129Nd are investigated with the configuration-dependent cranked Nilsson-Strutinsky approach. The calculatedbands are compared with the observed signature partner bands and very goodagreement results at high spin are obtained. The observed deformed bands are confirmed as normal and highly deformed and their properties are explained theoretically. Terminating states in 129Nd and other terminations are predicted. There is shape coexistence within the same configuration from low-spin statesto high-spin states. Possible normal and highly deformed bands withrotation around the intermediate principal axis in several interestingconfigurations of 129Nd are discussed. The experimental results for 131Nd are simply discussed and the calculated bands are in goodagreement with observed bands at high spin. Triaxial shapes in 127Nd with a triaxial deformation of γ～-12º are predictedand should be observed experimentally. The value of negative γ of π(h11/2)4ν(h11/2)7 configuration increases with neutron number increasing in 127,129,131Nd. The triaxial shape evolutions with neutron number increasing in 127,129,131Nd and in 126,128,130,132Pr are explained by the strong driving force ofspecified single particle orbitals towards to triaxial shape. |
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| Keywords: | rotational structure triaxial shape signature splitting configuration |
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