Kirandeep Sandhu

Study of Cold Fusion Reactions Using Collective Clusterization Approach

Within the framework of the dynamical cluster decay model (DCM), the 1n evaporation cross-sections ( of cold fusion reactions (Pb and Bi targets) are calculated for –113 superheavy nuclei. The calculations are carried out in the fixed range of excitation energy , so that the comparative analysis of reaction dynamics can be worked out. First of all, the fission barriers (B f ) and neutron separation energies () are estimated to account the decreasing cross-sections of cold fusion reactions. In addition to this, the importance of hot optimum orientations of β 2i-deformed nuclei over cold one is explored at fixed angular momentum and neck-length parameters. The hot optimum orientations support all the target-projectile (t,p) combinations, which are explored experimentally in the cold fusion reactions. Some new target-projectile combinations are also predicted for future exploration. Further, the 1n cross-sections are addressed for –113 superheavy nuclei at comparable excitation energies which show the decent agrement with experimental data upto nuclei. Finally, to understand the dynamics of higher-Z superheavy nuclei, the cross-sections are also calculated at maximum available energies around the Coulomb barrier and the effect of non-sticking moment of inertia () is also investigated at these energies.

Stability aspect of superheavy nucleus 296116* formed in 48Ca+248Cm reaction

Within the framework of dynamical cluster decay model (DCM), the neutron-evaporation residue cross-sections σ3n, σ4n in the hot fusion reaction 48Ca+248Cm→296116* are calculated over a wide range of compound nucleus excitation energies ECN* = 30-45MeV, within a single parameter description known as neck length parameter ΔR. The calculations are done by taking the superheavy proton magic Z=114, 120 and 126 with neutron magic in each case as N=184. Out of the three choices of magic numbers, the neutron evaporation residue contribution comes out to be largest for Z=126, lowest for the Z=114, clearly suggesting that the Z=126 is the strongest magic number, followed by Z=120 and Z=114 in sequence. Also, at comparable energies i.e. 38.9 MeV for neutron evaporation and 37.3 MeV for fission decay, the fragmentation and preformation paths of decaying fragments are almost independent of decay process. The component of quasi-fission is also analyzed along with fusion-fission and evaporation residues cross-sections.