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Study of Cold Fusion Reactions Using Collective Clusterization Approach

Communications in Theoretical Physics 2017年第10期67卷 505-517页

作者： Gurjit Kaur kirandeep sandhu Manoj K.Sharma School of Physics and Materials Science Thapar University

Within the framework of the dynamical cluster decay model(DCM), the 1n evaporation cross-sections(σ_(1n)) of cold fusion reactions(Pb and Bi targets) are calculated for ZCN = 104–113 superheavy nuclei. The calculations are carried out in the fixed range of excitation energy E_(CN)~*= 15 ± 1 MeV, so that the comparative analysis of reaction dynamics can be worked out. First of all, the fission barriers(B_f) and neutron separation energies(S_(1n)) 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 Z_(CN) = 104–113 superheavy nuclei at comparable excitation energies which show the decent agrement with experimental data upto Z_(CN) = 109 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(INS) is also investigated at these energies.

关键词：冷聚变反应集群化反应动力学激发能量集体横截面超重核模型框架

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Decay Analysis of Ge Isotopes Formed in Reactions Induced by Tightly and Loosely Bound Projectiles

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Communications in Theoretical Physics 2018年第11期69卷 565-577页

作者： Amandeep Kaur kirandeep sandhu Manoj K.Sharma School of Physics and Materials Science Thapar Institute of Engineering and Technology Patiala 147004PunjabIndia Department of Physics GSSDGS Khalsa CollegePatiala 147001PunjabIndia

The dynamical cluster-decay model (DCM) is employed to investigate the decay of ^(6870)Ge~* compound nuclei formed respectively via tightly (~4He) and loosely (~6He) bound projectiles, using ^(64)Zn target. The study is carried out over a wide energy range (E_(c.m.)～5 MeV to 16 MeV) by including the quadrupole deformations (β_(2i)) and optimum orientations (θ_i^(opt)) of the decaying fragments. The fusion cross-sections, obtained by adding various evaporation channels show nice agreement with the experimental data for ~4He+^(64)Zn reaction. The contribution from competing compound inelastic scattering channel is also analyzed particularly for ^(68)Ge~* nucleus at above barrier energies. On the other hand,the decrement in the fusion cross-sections of ^(70)Ge~* nuclear system is addressed by presuming that ^(65)Zn ER is formed via two different modes:(i) the αn evaporation of ^(70Ge)~* nucleus, and(ii) 1n-evaporation of ^(66)Zn~*nuclear system,formed via breakup and 2n-transfer channels due to halo structure of the ~6He projectile. Besides this, the suppression in2 np evaporation cross-sections suggests the contribution of another breakup and transfer process of ~6He i.e. ~4He+ ^(64)Zn.The contribution of breakup+transfer channels for ~6He+^(64)Zn reaction is duly addressed by applying relevant energy corrections due to the breakup of "~6He" projectile into 2n and ~4He. In addition to this, the barrier lowering, angular momentum and energy dependence effects are also explored in view of the dynamics of chosen reactions.

关键词： tightly and loosely bound projectiles evaporation residue breakup and transfer

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