Dynamical Study of Multifragmentation and Related Phenomena in Heavy-Ion Collisions

Abstract

In the first part of thesis, we shall deal with fragment emission in central collisions studied as a function of beam energy and system mass. Central collisions are also important candidate in view of exploring collective expansion and squeeze out phenomena \cite{dan93}. We have simulated the central collisions of ${}^{20}Ne{+}^{20}Ne$, ${}^{40}Ar{+}^{45}Sc$, ${}^{58}Ni{+}^{58}Ni$, ${}^{86}Kr{+}^{93}Nb$, ${}^{129}Xe{+}^{124}Sn$, and ${}^{197}Au{+}^{197}Au$. Peak IMF multiplicity is observed to follow power law of form: $c{A}_{tot}^{\tau }$, with exponent $\tau$ close to unity. Next we try to understand the clusterization mechanism in spectator matter fragmentation using \emph{simulated annealing clusterization algorithm} (SACA) advanced by Puri \emph{et al}. Earlier recognition of fragments structure (around 60 fm/c) also points towards dynamical origin of fragments. We shall also highlight the importance of momentum dependent interactions in probing nuclear EoS via intermediate energy heavy-ion collisions. Estimation of baryonic entropy would also be discussed.

2 pages, 2 figures, Contribution to DAE Symposium on Nuclear Physics, December 20-24, 2010, BITS, Pilani, Rajasthan,India-333031