Decay dynamics of compound nuclei using collective fragmentation approach

During last over one decade, collective fragmentation approach of Dynamical Cluster Decay Model (DCM) has been applied to understand various decay mechanisms of a large number of nuclei formed in low-energy heavy-ion reactions. Various decay possibilities such as Evaporation Residue (ER), Intermediate Mass fragments (IMP), Heavy Mass Fragments (HMF) and symmetric/asymmetric fission fragments along with the competing non-compound nucleus mechanisms have been analyzed by incorporating the temperature, deformations and angular momentum effects. In view of above, the present work is aimed to explore the reaction mechanism induced via loosely bound projectile (⁹Be). Various anomalous properties of such projectiles like low binding energy per nucleon leading to low breakup threshold, larger rms radius, higher transfer probability etc., captivate the attention of scientists working in related field. Thus, an effort is made to analyze the impact of ⁹Be beam on ⁸⁹Y target, exhibiting complete fusion (CF) and incomplete fusion (ICF) processes over energy range (E_c.m = 17.7-29.8 MeV) within DCM. The projectile used in ⁹Be+⁸⁹Y reaction may dissociate into ⁵He, ⁴He and ¹n, which may lead to ICF contribution via three different channels. Thus, the reaction dynamics of all ICF channels (⁵He + ⁸⁹Y → ⁹⁴Nb^*, ⁴He + ⁸⁹Y → ⁹³Nb^* and ¹n+⁸⁹Y → ⁹⁰Y^*) is duly examined. The calculations are done for quadrupole (β_2i-deformed) choice of fragments using optimum orientations approach. It is observed that DCM calculated cross sections for CF and ICF channels are in nice agreement with the experimental data. Furthermore, the comparative analysis of different isotopes of Technetium (^96,98,1⁰²Tc) has been explored at comparable excitation energy (E^*_CN) with reference to the available data. (author)