Difficulties in probing density dependent symmetry potential with the HBT interferometry

摘要: Based on the updated UrQMD transport model, effect of symmetry potential energy two-nucleon HBT correlation is investigated with help coalescence program for constructing clusters, and CRAB analyzing two-particle correlation. An obvious non-linear dependence neutron-proton (or neutron-neutron) function ($C_{np,nn}$) at small relative momenta stiffness factor $\gamma$ found: when $\gamma \lesssim 0.8$, $C_{np,nn}$ increases rapidly increasing $\gamma$, while it starts to saturate if \gtrsim 0.8$. It also found that both low densities conditions clusters late stage whole process influence same power.