科研之友
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摘要
The decay of Ra-220* nucleus formed in two different entrance channels C-12+Pb-208 and C-13+Pb-207 is investigated over a wide range of incident energies using the dynamical cluster decay model (DCM). The DCM is a non-statistical model used to account for the decay of hot and rotating nuclei formed in low energy heavy ion reactions. The excitation functions are calculated by considering quadrupole (beta(2)) deformations with optimum orientations (theta(opt)(i)) of decaying fragments. The DCM-based cross-sections for evaporation residue (ER), fusion-fission, alpha xn and neutron decay processes find nice agreement with the reported experimental data over wide range of incident energies. The cross-sections corresponding to different decay mechanism are worked out within DCM by fitting neck length parameter (Delta R). The entrance channel and angular momentum effects are investigated in reference to the above-mentioned reaction channels. In addition to this, the fragment mass distribution is worked out by colliding C-13 weakly bound stable projectile with a variety of target nuclei resulting in C-13 + Tb-159, C-13 + Ta-181 and C-13 + Pb-207 reactions. At comparable projectile energies, the increase in target mass is shown to favor asymmetric fragmentation in the fissioning region. Besides this, the incomplete fusion (ICF) contribution is worked out for C-12 and C-13 channels by applying necessary energy corrections in the framework of DCM.
- 出版日期2014-5
