The influence of reconstruction criteria on the sensitive probes of the symmetry potential

Different criteria of constructing clusters and tracing back $\mathrm{\Delta }$ resonances from the intermediate-energy neutron-rich HICs are discussed by employing the updated UrQMD transport model. It is found that both the phase-space and the coordinate-density criteria affect the single and the double neutron/proton ratios of free nucleons at small transverse momenta, but the influence becomes invisible at large transverse momenta. The effect of different methods of reconstructing freeze-out $\mathrm{\Delta }$s on the ${\mathrm{\Delta }}^0\mathrm{/}{\mathrm{\Delta }}^{++}$ ratio is strong in a large kinetic energy region.