Pion production and absorption in heavy-ion collisions
release_4ivymnzdyvfd3cl64f2trgw6fm
by
Yuan Gao, Lei Zhang, Gao-Chan Yong, Zi-Yu Liu, Wei Zuo
2020
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 Δ decay at the average density around 1.75ρ_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.
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