System evolution of forward-backward multiplicity correlations in a multi-phase transport model

Abstract

The initial geometry effect on forward-backward multiplicity correlations $C(N_f,N_b)$ is studied in relativistic collisions between light nuclei by using a multiphase transport model (AMPT). It is found that tetrahedron ${}^{16}$O + ${}^{16}$O gives a more uniform and symmetrical fireball which produces a more isotropic distribution of final particles after the expansion and evolution, and leads to a small $C(N_f,N_b)$. Forward-backward multiplicity correlation could be taken as a useful probe to distinguish the pattern of $\alpha$-clustered ${}^{16}$O in experiments by comparing the neighboring colliding nuclear systems like ${}^{14}$N + ${}^{14}$N and ${}^{19}$F + ${}^{19}$F.

Comments: 7 pages, 6 figures; accepted by Phys. Rev. C