Effect of in-medium nucleon-nucleon cross section on proton-proton momentum correlation in intermediate-energy heavy-ion collisions

he proton-proton momentum correlation function (Cpp) from dierent rapidity regions are systematically investigated for the Au + Au collisions at dierent impact parameters and dierent<br />energies from 400A MeV to 1500A MeV in the framework of the isospin-dependent quantum molecular dynamics model (IQMD) complemented by the Lednick y and Lyuboshitz analytical method.<br />In particular, in-medium nucleon-nucleon cross section (NNCS) dependence of the correlation function is brought into focus, while the impact parameter and energy dependence of the momentum<br />correlation function are also explored. The sizes of the emission source are extracted by tting the<br />momentum correlation functions using the Gaussian source method. We nd that the in-medium<br />nucleon-nucleon cross section obviously in uence the proton-proton momentum correlation function<br />which is from the whole rapidity or projectile/target rapidity region at smaller impact parameters,<br />but there is no eect on the mid-rapidity proton-proton momentum correlation function, which<br />indicates that the emission mechanism diers between projectile/target rapidity and mid-rapidity<br />protons.