Emissions of fragments and mesons produced in heavy-ion collisions at CSR and related energies

摘要

Using a multisource ideal gas (MSIG) model,we reconstruct the transverse emission source in the momentum space for light fragments produced in reactions 86Kr-124Sn at 25 MeVucleon and b=7-10 fm based on the theoretical predictions of the Isospin-Dependent Quantum Molecular Dynamics (IDQMD) model.We show that the MSIG model can reasonably describe the IDQMD-predicted results for the azimuthal distribution and the transverse momentum dependence of elliptic flow v2 and fourth-order anisotropic flow v4 but can only qualitatively describe the transverse momentum spectra.The azimuthal distributions of nuclear fragments produced in heavy-ion collisions at intermediate energies are studied by the MSIG model.The calculated results are compared and found to be in agreement with the experimental data of Ca-Ca,Nb-Nb,and Au-Au collisions at 150-800 MeVucleon beam energies.Meanwhile,the angular distributions of pions and kaons produced in heavy-ion collisions at the low-energy end (1-2 GeVucleon) of high energies are investigated by the MSIG model,too.The calculated results are compared and found to be in agreement with the experimental data of the KaoS Collaboration.