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One of the aims to research relativistic heavy-ion collisions is to explore the probability of quark-gluon plasma phase transition from normal nuclear matter. Hadron and string cascade model (JPCIAE) ,based on the hypothesis without introducing the quark-gluon plasma (QGP), is employed to study the direct photon and π 0 transverse momentum distributions for central 208Pb+208Pb collisions at 158 AGeV/c; The theoretical results of transverse momentum distribution for both the direct photon and the π0 particle are lower than the data of WA98 experiment. Having considered the fact that the
One of the aims to research relativistic heavy-ion collisions is to explore the probability of quark-gluon plasma phase transition from normal nuclear matter. Hadron and string cascade model (JPCIAE), based on the hypothesis without introducing the quark-gluon plasma (QGP ), employed to study the direct photon and π 0 transverse momentum distributions for central 208Pb + 208Pb collisions at 158 AGeV / c; The theoretical results of transverse momentum distribution for both direct photon and the π0 particles are lower than the data of WA98 experiment. Having considered the fact that the