Study of Grodzins product in collective nuclear structure

摘要

The systematic dependence of Grodzins product E(2~(+)_(1))*B(E2)↑ on the nucleonic promiscuity factor, i.e. P-factor = (N_(p)N_(n))/(N_(p)+ N_(n)), is studied in the Z = 50−82, N = 82−126 major shell space. The anomalous behaviour is noticed at N = 88−90, where the Grodzins product fails to maintain the constancy corresponding to P ≥ 4. The nuclei for P ≥ 4 region are recognised for enhanced collectivity, where p−n interaction is of the order of ~250 keV and it begins to dominate the pairing interaction of ~1 MeV. The P-factor also resolves the anomaly of not obtaining smooth universal Casten curve in N_(p)N_(n)scheme. The approximate constancy in Grodzins product is noticed for well deformed nuclear region. The relation between Grodzins product and P-factor has been studied for the first time.