Sudden Shape Change from Spherical to Maximally Deformed for A approx equal 100 Nuclei

摘要

Among the unusual features of neutron-rich A approx equal 100 nuclei is a sudden change of nuclear shape. The analysis of B(E2) and B(M1) values from recent level lifetime measurements indicates that Sr (and perhaps also Zr) nuclei obtain their largest deformations for the nuclei at the onset of deformation, which suggest a ''phase change'' from a spherical to a maximally deformed shape. 15 refs., 6 figs.