Emission of relativistic light fragments in nucleus-emulsion collisions athigh energy

The transverse momentum, emission angle and pseudorapidity distributions of relativistic alpha fragments produced in nucleus-emulsion collisions have been analysed using a two-temperature emission picture. The two emission so urces are the projectile spectator contact layer (hot spectator) with high temperature and the other part (cold spectator) with low temperature. The t ransverse momentum distributions of relativistic proton fragments produced in nucleus-emulsion collisions at high energy have been analysed by a three -temperature emission picture. The three emission sources are the projectil e participant local region that emits the leading protons, the projectile s pectator contact layer (hot spectator) and the other part (cold spectator), respectively. The calculated results are in agreement with the experimenta l data of nucleus-emulsion collisions in the present accelerator energy reg ion. The temperatures of the emission sources can be obtained from one of t he transverse momentum, emission angle and pseudorapidity distributions. Fo r a heavy projectile at high energy (for example Pb-208 at 160A GeV), the t emperatures of the hot spectator and the cold spectator obtained from the p seudorapidity distribution of relativistic alpha fragments are 120 and 40 M eV, respectively.