Effects of elastic and inelastic NN scattering cross sections on pion-/pion+ ratios in heavy-ion collisions at intermediate energies

TL;DR

This study investigates how elastic and inelastic nucleon-nucleon scattering cross sections influence the ratio of negative to positive pions in neutron-rich calcium collisions at intermediate energies, using transport and scaling models.

Contribution

It introduces a detailed analysis of the impact of NN scattering cross sections on pion production ratios in heavy-ion collisions, incorporating isospin dependence and effective mass scaling.

Findings

Both elastic and inelastic NN scattering cross sections significantly affect pion ratios.

Cross-section variations influence Delta_1232, pion-, and pion+ production.

The pion-/pion+ ratio is sensitive to the scattering cross section effects.

Abstract

Based on the isospin-dependent Boltzmann-Uehling-Uhlenbeck transport model and the scaling model according to nucleon effective mass, effects of elastic and inelastic NN scattering cross sections on pion-/pion+ in the neutron-rich reaction of Ca48+Ca48 at a beam energy of 400 MeV/nucleon are studied. It is found that cross-section effects of both NN elastic and inelastic scatterings affect Delta_1232, pion- and pion+ production, as well as the value of pion-/pion+.