Influence of the in-medium kaon potential on kaon production in heavy ion collisions

摘要

The inclusive cross section and polar angle distribution of K~+ mesons in Ni + Ni collisions at incident energy 1.93 AGeV are studied using the Quantum Molecular Dynamics model based on the covariant kaon dynamics, and compared with experimental KaoS data from GSI. The calculated K~+ yields better fit to experiment data for a soft nuclear equation of state (compression modulus K = 200 MeV) when including the in-medium K~+ potential (its value at saturation density is U_k (ρ_0) ≈ 30MeV). The calculated results for the polar angle distribution of K~+ in Ni + Ni collisions at 1.93 AGeV are slightly more forward and back direction than KaoS data.