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We perform two-pion Hanbury Brown-Twiss (HBT) interferometry for thepartially coherent pion-emitting sources in relativistic heavy-ion collisions,using a multi-phase transport (AMPT) model. A longitudinal coherent emissionlength, as well as a transverse coherent emission length, are introduced to thepion generation coordinates in calculating the HBT correlation functions of thepartially coherent sources. We compare the model results with and withoutcoherent emission conditions with experimental data in Au-Au collisions atcenter-of-mass energy $\sqrt{s_{NN}}=$200 GeV, and in Pb-Pb collisions atcenter-of-mass energy $\sqrt{s_{NN}}=$2.76 TeV, and find that the HBT resultsof the partially coherent sources are closer to the experimental data thanthose of chaotic sources.

Two-pion interferometry for partially coherent sources in relativistic heavy-ion collisions in a multi-phase transport model