Space-time characterization and collective motion at intermediate energies

Abstract

Shape analyses of two-particle correlation functions are discussed. Two-proton imaging provides information about the volume, the relative contributions between fast and slow emitting sources and the profile of the twoparticle source that can be directly compared to microscopic model simulations. In the case of correlations between complex particles, the role played by collective motion and space-momentum correlations needs special considerations. By means of a semi-quantitative Monte Carlo approach, deuteron-alpha correlation functions measured in Xe+Au collisions at E/A=50 MeV are investigated. The comparison reveals the existence of a position-relative momentum correlation that reduces the apparent source size and distorts the line-shape of the correlation function. The developed ideas show how intensity interferometry with complex particles is sensitive not only to the geometry of the system but also to the interplay between collective and thermal motion.

Isospin dependent hybrid model for studying isoscaling in heavy ion collisions around the Fermi energy domain

“…To get a better measure of excitation of the fragmenting system the pre-equilibrium particles can be identified after BUU simulation at the freeze-out stage and can be taken out. In different multifragmentation experiments, it is observed that after pre-equilibrium emission around 75% to 80% of the total mass creates the fragmenting system [34][35][36]. To make it consistent with the other exiting works on the 112 Sn+ 112 Sn and 124 Sn+ 124 Sn reactions at 50 MeV/nucleon, we choose the test particles which create 75% of the total mass from the most central dense region.…”

Hybrid model for studying nuclear multifragmentation around the Fermi energy domain: The case of central collisions of Xe on Sn

“…These fit the category of preequilibrium emission. In different multifragmentation experiments, it is observed that after pre-equilibrium emission, 75% to 80% of the total mass creates the fragmenting system [23][24][25]. Hence we choose the test particles which create 80% of the total mass (i.e.…”