Effects of high-momentum tail of nucleon momentum distribution on initiation of cluster production in heavy-ion collisions at intermediate energies

TL;DR

This study investigates how the high-momentum tail of nucleon momentum distribution influences cluster production in heavy-ion collisions, revealing centrality-dependent effects on fragment multiplicity, isotope ratios, and flow distributions.

Contribution

It introduces a detailed analysis of HMT effects in heavy-ion collision simulations using an isospin-dependent transport model with a coalescence afterburner, highlighting their impact on various observables.

Findings

HMT significantly affects fragment multiplicity distribution.

HMT influences the neutron to proton ratio of produced isotopes.

HMT impacts the rapidity distributions and elliptic flows of clusters.

Abstract

Based on the transport model isospin-dependent Boltzmann-Uehling-Uhlenbeck coupled with a phase-space coalescence afterburner, we studied the effects of the high-momentum tail (HMT) of nucleon momentum distribution in initialization in 197Au+197Au reactions at a beam energy of 400 MeV/nucleon with different impact parameters.We found remarkable impact parameter-dependent HMT effects on the fragment multiplicity distribution. The average neutron to proton ratio of produced isotopes is also affected by the HMT. The rapidity distributions of triton and 3He and their elliptic flows are all evidently affected by the HMT. All the effects of the HMT on the cluster production in heavy-ion collisions are centrality dependent.