Decay analysis of compound nuclei with masses A approximate to 30-200 formed in reactions involving loosely bound projectiles

作者：Kaur Mandeep; Singh BirBikram^*; Sharma Manoj K; Gupta Raj K

来源：Physical Review C, 2015, 92(2): 024623.

DOI：10.1103/PhysRevC.92.024623

The dynamics of compound nuclei formed in the reactions using loosely bound projectiles are analyzed within the framework of the dynamical cluster-decay model (DCM) of Gupta and Collaborators. We have considered the reactions with neutron-rich and neutron-deficient projectiles, respectively, as Li-7, Be-9, and Be-7, on various targets at three different E-lab energies, forming compound nuclei in the mass region A similar to 30-200. For these reactions, the contributions of light-particle (LP, A <= 4) cross sections sigma(LP), energetically favored intermediate-mass-fragment (IMF, 5 <= A(2) <= 20) cross sections sIMF, as well as the fusion-fission ff cross sections sigma(ff) constitute the sigma(fus) (=sigma(LP) + sigma(IMF) + sigma(ff)), i.e., the contributions of the emitted LPs, IMFs, and ff fragments are added for all the angular momenta up to the l(max) value for the respective reactions. Interestingly, we find that the empirically fitted neck-length parameter Delta R-emp, the only parameter of the DCM, is uniquely fixed to address sigma(fus) for all the reactions having the same loosely bound projectile at a chosen incident laboratory energy. It may be noted that, in DCM, the dynamical collective mass motion of preformed LPs, IMFs, and ff fragments or clusters, through the modified interaction potential barrier, are treated on parallel footing. The modification of the barrier is due to nonzero Delta R-emp, and the values of corresponding modified interaction-barrier heights Delta V-B(emp) for such reactions are almost of the same order, specifically at the respective l(max) value.

• 出版日期2015-8-28