Peculiarities of lambda Hyperon and pi Meson Production in Nucleus-Nucleus Collisions at High Energies

摘要

The analysis of experimental data on the production of lambda hyperons and anti pi mesons in He-Li, C-C, C-Ne and O-Ne collisions at 4.5 Gev/c per nucleon and C-C collisions at 4.2 Gev/c per nucleon is presented. Kinematical features of lambda are shown to depend on the collision centrality in contrast to the stable behaviour of the pion characteristics. The correlation between the characteristics of lambda and accompanying pions is observed. The effects seem to be incompatible with the intranuclear cascade approach. The data suggest the formation of a fully stopped and themalized hot source in central nucleus-nucleus collisions in which lambda hyperons are produced. 16 refs.; 7 figs. (Atomindex citation 18:007940)