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摘要
Quantitative evidence of the spherical-to-deformed shape phase transition near N=90 is given using the model-independent quadrupole shape invariant q(2), which provides a measure of the beta deformation of a given nucleus. This shape invariant is obtained using experimental B(E2) values for the ground state band and first excited 0(+) band of Gd isotopes around N=90, and is compared to calculations within the interacting boson model. Near the shape phase transition, the ground and excited 0(+) band deformations are observed to cross.
- 出版日期2008-11
