Fragmentation analysis of various compound nuclei formed in the mass region 200 and the associated entrance channel effects

The dynamical cluster-decay model (DCM) is employed to analyse the decay of various compound nuclei (CNs) having mass ACN approximate to 200 such as 194Hg*,Tl-197(*),(202)Pb(*)and (210) Rn-*, formed in O-16-induced reactions, at common excitation energy E-CN(*) similar to 45 MeV. Calculations are made for three decay fragment configurations, i.e., spherical, beta(2)-deformed 'hot-compact' and beta(2)-deformed 'cold-elongated' to study the effect of deformation and orientation in the decay dynamics. The structure of fragmentation potential and preformation probability of the chosen nuclei get the significantly modified after the inclusion of deformation and orientation effects, besidesshowing a dependence on the mass of CN. Further, an investigation is carried out to see the effect of entrance channel properties on the decay dynamics. For this, three reactions, such as C-12+(182) W, O-16+(178) Hf and Ar-40 +1(54)Sm are considered which form the 194Hg*CN at common E-CN(*) similar to 57 MeV. The barrier characteristics, fragmentation structure, preformation probability, barrier penetrability, evaporation residue and fission cross-sections are calculatedto analyse the role of the entrance channel in the subsequent decay dynamics. The calculated neutron evaporation residue and fission cross-sections agree well with the experimental data. The most probable fission fragments are identified for the compound nuclei, and the corresponding experimental validation is called for. Moreover, Bohr's independent hypothesis is tested in view of the survival probability (Psurv) of the chosen reactions.

Automated summary

In this study, the dynamical cluster-decay model (DCM) is used to analyze the decay of various compound nuclei (CNs) with a mass approximately 200, such as 194Hg*, Tl-197(*), (202)Pb(*), and (210)Rn-*. The effect of deformation and orientation on the decay dynamics is studied by considering three decay fragment configurations: spherical, beta(2)-deformed 'hot-compact' and beta(2)-deformed 'cold-elongated'. The role of entrance channel properties on the subsequent decay dynamics is also investigated.