Speaker
Description
The excited states of nuclei near the N=50 and 82 closed shells can be well described by the shell model, thereby offering a suitable laboratory to test its predictions. Therefore, it has been attracting a large number of experimental and theoretical studies for these nuclei. Such studies are of great significance in providing information on the mechanism of particle-hole excitations of the N=50 and 82 cores. Using the in-beam -spectroscopic techniques, we have populated the high-spin states of 88Y (Z=39, N=49), 89Y (N=50), 141Pr (Z=59, N=82), and 142Pr (N=83) by the heavy-ion fusion evaporation reactions. The high-spin states of 142Pr have been reported for the first time. Combining large-scale shell model calculations, the neutron excitations across the N = 50 and 82 gap in 89Y and 141Pr have been observed. The level structures come from neutron core excitations have also been identified in 85Br (Z=35, N=50) and 92Mo (Z=42, N=50). The systematic features of neutron cross-shell excitations in the N=50 and 82 isotones have also been investigated.
