Fusion-Fission Analysis of Various Nuclei with ACN ~ 40 -150 Formed Via Identical Projectile and Target Combinations

Abstract

The main emphasis of this dissertation is to investigate the heavy-ion reaction dynamics by studying the formation and decay of various compound nuclear systems formed via mass-symmetric colliding nuclei. The study is done using the semiclassical approach in Skyrme energy density formalism (SEDF). The fusion cross-sections of mass-symmetric reactions is investigated using Wong model and its extended version (`-summed Wong method). The subsequent decay dynamics of hot and rotating compound nuclei formed via symmetric reactions is investigated with the use of collective clusterisation approach (Dynamical cluster-decay model DCM). The dissertation is organized into three chapters, as brie y discussed below: Chapter 1 begins with the general introduction of nuclear physics and a brief account of heavy-ion reactions in low energy region, laid on the formation of compound nuclear systems and subsequent decay mechanisms. Beside this, the relevant e ect of deformation and orientation is discussed in this chapter. Chapter 2 represents the brief methodology used in the present work. For studying the formation and disintegration of excited compound nucleus (CN), the nucleus-nucleus interaction potential is calculated using SEDF, details of which are described here. In this description, the Wong model along with its extended version are also explained in brief. To analyze decay properties such as decay cross-sections, DCM build on the Quantum mechanical fragmentation theory (QMFT) along with its relevant parameters, is also outlined in this chapter. Chapter 3 consists of calculations and results. In this recent work, the nuclear po- tential is calculated using SEDF approach for the mass-symmetric reactions, i.e (19F +19 F); (24Mg+24Mg); (28Si+28Si); (46Ti+46Ti); (64Ni+64Ni) and (74Ge+74Ge). Since the projectile-target of above mentioned reactions are deformed, so the cold and hot optimum cases have been introduced in the calculation of fusion cross-sections, across the Coulomb barrier energies, using Wong model and extended `-summed Wong model. To explore the ssion dynamics of excited CN formed from symmetric reactions, DCM is applied to cal- culate the cross-sections at common excitation energy E CN = 45 MeV which corresponds to above barrier region.