Influence of angular momentum and Coulomb interaction of colliding nuclei on their multifragmentation

TL;DR

This paper investigates how angular momentum and Coulomb interactions influence nuclear fragmentation in heavy-ion collisions, revealing new correlations and effects on isotope production through statistical modeling.

Contribution

It introduces a detailed statistical model incorporating angular momentum and Coulomb effects to better understand multifragmentation in heavy-ion collisions.

Findings

Identification of specific fragment size and velocity correlations.

Significant influence of angular momentum and Coulomb effects on isotope yields.

Observation of emission patterns in the reaction plane.

Abstract

Theoretical calculations are performed to investigate the angular momentum and Coulomb effects on fragmentation and multifragmentation in peripheral heavy-ion collisions at Fermi energies. Inhomogeneous distributions of hot fragments in the freeze-out volume are taken into account by microcanonical Markov chain calculations within the Statistical Multifragmentation Model (SMM). Including an angular momentum and a long-range Coulomb interaction between projectile and target residues leads to new features in the statistical fragmentation picture. In this case, one can obtain specific correlations of sizes of emitted fragments with their velocities and an emission in the reaction plane. In addition, one may see a significant influence of these effects on the isotope production both in the midrapidity and in the kinematic regions of the projectile/target. The relation of this approach to the simulations of such collisions with dynamical models is also discussed.