Simulations of momentum correlation functions of light (anti)nuclei in relativistic heavy-ion collisions at p s NN = 39 GeV 后印本

摘要: Momentum correlation functions of light (anti)nuclei formed by the coalescence mechanism of (anti)nucleons are calculated in several relativistic heavy-ion collision systems, namely B + B, O + O, Ca +Ca as well as Au +Au, at di#11;erent centralities at center of mass energy  39 GeV within the framework of A Multi-Phase Transport (AMPT) model complemented by the Lednick#19; y and Lyuboshitz analytical method. Momentum correlation functions for identical or nonidentical light (anti)nuclei are constructed in the above collision systems at so high collision energy. The results suggest that emission of light (anti)nuclei occurs from a source of smaller spacetime extent in more peripheral collisions. The e#11;ect of system-size on the momentum correlation functions of identical or nonidentical light (anti)nuclei is also explored in several central collisions. The results indicate that the emission source-size of light (anti)nuclei pairs deduced from their momentum correlation functions and system-size is self-consistent. Momentum correlation functions of nonidentical light nuclei pairs gated on velocity are applied to infer the average emission sequence of them. The results indicate that protons are emitted in average on a similar time scale with neutrons but earlier than deuterons or tritons in the small relative momentum region. In addition, larger interval of the average emission order among them is observed by large centrality and smaller system collisions.