Calculation of momentum correlation functions between , K, and p for several heavy-ion collision systems at sNN=39 GeV

Momentum correlation functions between z, K, and p are calculated for several heavy-ion collision systems, namely5 10B + 5 10B, 8 16O + 8 16 O, 40 20Ca + 40 20Ca, and 79 197Au + 197 79 Au in central collisions as well as 197 79 Au + 197 79 Au collision in different centralities at center-of-mass energy root sNN = 39 GeV within the framework of a multiphase transport model complemented by the LednickATIN SMALL LETTER Y WITH ACUTE and Lyuboshitz analytical method. The results present the centrality and system-size dependence of the momentum correlation functions among pairs of z, K, and p, from which the emission source-size can be deduced. It is found that the deduced source sizes increase with the decreasing of centrality for Au + Au system or with the increasing of system size in central collisions with different nuclear size. In addition, through the momentum correlation functions of nonidentical particle pairs gated on velocity, the average emission sequence of nonidentical particles can be indicated. The results illustrate that in the small relative momentum region, protons are emitted in average earlier than n+ and K+, and K+ are emitted averagely earlier than z+. Furthermore, it seems that larger interval of the average emission order among them is exhibited for smaller collision systems. The present study sheds light on the dynamics of light particle emission at RHIC energy.