Proton and kaon production in Au+Au collisions at √sNN = 3 GeV

摘要: Within an extended isospin- and momentum-dependent Boltzmann-Uehling-Uhlenbeck transport model, we study the protons, K + mesons and Λ hyperons production in Au+Au collisions at √sNN =3 GeV. For the collision in 0-10% centrality, we study the transverse momentum spectra and rapidity dependent mean transverse momentum for protons. For the collision in 10-40% centrality, we study the directed and elliptic flows for protons and K + mesons. The results show that the momentumdependent nuclear mean field with an incompressibility K0 = 230 MeV can fit fairly the STAR experimental data, while the momentum-independent nuclear mean field with both K0 = 230 MeV and K0 = 380 MeV can only partially describe the experimental results. In addition, we also study the directed and elliptic flows for the associated Λ, observations reveal the same conclusions as for kaons. These findings indicate that the momentum dependence of nuclear mean field plays a significant role in understanding nuclear matter properties in heavy-ion collisions at √sNN = 3 GeV.