Clustering effects in the exit channels of C-13,C-12+C-12 reactions within the collective clusterization mechanism of the dynamical cluster decay model

摘要

From the past few years, increasing experimental evidence has shown that clusters (multiple of a particles) of intermediate mass are emitted with quite large cross sections at forward angles in heavy-ion reactions. In the present work a theoretical investigation has been made to explore the role of alpha-lustering in C-13,C-12 + C-12 reactions populating Mg-25,Mg-24* compound nuclei (CN), which results in the enhanced cross sections of intermediate mass fragments (IMFs) within the collective clusterization framework of the dynamical cluster decay model (DCM). With in the formalism the experimental cross sections are reproduced using the spherical as well as deformed configurations effects included up to quadruple deformations (beta(2i)) for two nuclei having optimum orientations. opt. The ratio of the calculated (fission-like) yields of each isotopic fragment Li-6,Li-7, Be-7,Be-8,Be-9 obtained in the two reactions has been compared with the experimental and statistical model predictions also. The DCM calculated result is in little better comparison to the statistical models due to the inclusion of structure effects in the calculations. In the present calculations, the dynamical yields count for the preformation probability (P-0) of the IMFs within the collective clusterization process of DCM, before penetrating the scattering potential barrier. Quite interestingly, the calculated ratio of P-0 of the corresponding IMFs P-0(IMFs)(25Mg)* for the CN Mg-25,Mg-24* shows the trend of ratio of experimental cross sections, i.e., sigma(25Mg)(IMFs)*u/sigma(24Mg)(IMFs)*. It is found that alpha-cluster structure of complimentary fragments of the IMFs under investigation plays quite a significant role in their decays.