Analytical description of collective observables incorporating saturation phenomena

Abstract
Phenomenological calculations based upon the Npi Nnu scheme for around 50 nuclei in the A=150 region are carried out. The calculations use a total of only eight parameters. The saturation of level energies, B(E2; 01+ to 21+) values and calculated values of the integrated quadrupole proton-neutron interaction mod Spn mod are well reproduced.