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Title: Influence of Symmetry Energy on Mass Symmetric and Asymmetric Heavy Ion Reactions
Authors: Kaur, Amandeep
Supervisor: Kumar, Suneel
Pandey, O.P.
Keywords: Heavy ion collisions;Equation of state;Density Dependent Symmetry Energy;Multifragmentation;Nuclear Stopping
Issue Date: 30-Jul-2018
Abstract: In the present study we intend to investigate the role of density dependent symmetry energy (DDSE) for mass symmetric and mass asymmetric nuclear reactions. The theoretical investigations are carried out utilizing microscopic quantum molecular dynamics (QMD) and isospin-dependent quantum molecular dynamics (IQMD) models. Author has made a descriptive analysis for fragment production, fragment yield, transverse flow and nuclear stopping (thermalization) subjected to the well established DDSE. Initially, general introduction of the nuclear physics and blueprint of the present work have been discerned. Various predicted and observed phenomena at intermediate energies will be presented owing to their significant role to study heavy ion collisions (HICs) at intermediate energies. Then overview of mass symmetric and asymmetric HICs is given. The role of DDSE and its various forms on the dynamics of the reaction are discussed. The status of the available experimental and theoretical endeavors carried out by various collaborations for multifragmentation, nuclear stopping and anisotropic flow has also been summarized. Author has used primary models QMD and IQMD for the present investigation and has portrayed these in detail in the present work. Author has first analyzed the impact of initialization parameters (i.e. physics as well as technical) on multifragmentation and flow. The dependence of the observable on mean field potential parameters, Coulomb and symmetry potentials as well as the initialization conditions of the above mentioned two models have been considered. Subsequently the most appropriate approach has been taken into account to ponder the direct impact of DDSE on multifragmentation in case of mass symmetric and mass asymmetric HICs. The effect of mass asymmetry on the fragment production is very much evident. The influence of DDSE can be surmised from the multiplicity of fragments produced from participant zone. The experimental information for nearly symmetric reaction has been compared with theoretical calculations. Attempts have been made to investigate the influence of DDSE on global and local nuclear stopping for mass symmetric and asymmetric nuclear reactions over a wide range of incident energies and impact parameters. It has been observed that global as well as local nuclear stopping is influenced by the mass asymmetry of the reaction firmly. Impact of DDSE has been noticed in local nuclear stopping. Also, as the impact parameter increases, the global stopping decreases. Influence of impact parameter on nuclear stopping is more at higher energies. At last, we present a viewpoint along with the conclusions and importance of the work done in this thesis.
Description: Doctor of Philosophy- SPMS
Appears in Collections:Doctoral Theses@SPMS

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