Entrance channel effects in the decay of [sup 190]Pt

Abstract

The entrance channel effects in the decay of compound nucleus 190 Pt * formed using different incoming channels i.e. 132 Sn+ 58 Ni and 126 Sn+ 64 Ni is studied by using dynamical cluster-decay model (DCM). The neutron-rich radioactive beams of 132 Sn and 126 Sn are used here. We ¿nd that with the inclusion of deformation effects up to quadrupole (β 2 ), the structure of potential energy surfaces changes a little bit at =0 and signi¿cantly at = max . It is also observed that for both the entrance channels, the preformation probability of decaying fragments is almost identical at same max and comparable centre of mass energies. This identical potential energy surface behavior and same max values in either of entrance channels, enable us to conclude that decay of 190 Pt * is independent of formation effects. The relevant role of level density parameter is also analyzed.