Pion production and absorption in heavy-ion collisions

TL;DR

This study uses the IBUU transport model to analyze pion production and absorption in central Au+Au collisions at 400 MeV/nucleon, revealing details about pion dynamics and their relation to nuclear symmetry energy.

Contribution

It provides a detailed analysis of pion production, absorption, and scattering processes in heavy-ion collisions, highlighting their connection to high-density nuclear matter properties.

Findings

Pions are mainly produced by $ riangle$ decay at 1.75$ ho_0$ density.

Approximately 18% of pions are absorbed in inelastic collisions.

More than half of the free pions have scattered multiple times, with higher momentum.

Abstract

Based on the isospin dependent transport model IBUU, the pion production and its absorption are thoroughly studied in the central collision of $Au+Au$ at a beam energy of 400 MeV/nucleon. It is found that the pions are firstly produced by the hard $\Delta$ decay at the average density around $1.75\rho_{0}$, whereas about 18\% of them are absorbed absolutely in the subsequent inelastic collisions. For the free pions observed, more than half of them have been scattered for one or more times before they are free from matter. And the more scattering numbers of pions, the higher the momentum they possess. These pions, due to longer time of their existence in high density nuclear matter, carry more information about the symmetry energy of the nuclear matter at high densities.