Study on the Dynamics of Particle Formation and Supernucleus Formation Mechanism in Antiproton-induced Nuclear Reactions

Within the framework of Lanzhou quantum molecular dynamics (LQMD) transport model, we investigate the particle production and fragmentation mechanism of target nucleus induced by antiproton with the Skyrme energy density functional and relativistic covariant density functional, respectively. The temporal evolution and phase-space distributions of π, K, Λ and Σ as well as the mass and charge distributions of nuclear fragments and hypernuclear fragments are analyzed by the model in the reaction of antiproton on ^58\mathrmNi at an incident momentum of 5 GeV/c. It is found that the phase-space distributions of particles are similar with the two mean-field potentials, but different situation for the fragment distribution, in particular for the intermediate mass fragments. The fluctuation effect of the collision system is more obvious under the relativistic mean field, which leads to the high debris yield.