Anisotropic flow can offer significant information of evolution dynamics in heavy-ion collisions. A systematic study of the directed flow \(v_1\) and elliptic flow \(v_2\) of hard photons and free nucleons is performed for \(^{40}\)Ca + \(^{40}\)Ca collisions in a framework of isospin-dependent quantum molecular dynamics (IQMD) model. The study firstly reveals that thermal photons emitted in intermediate-energy heavy-ion collisions have the behaviors of directed and elliptic flows. The interesting phenomena of incident energy dependence of \(v_1\) and \(v_2\) for thermal photons in central collisions also confirmed that it can be regarded as a good probe of evolution dynamics. Moreover, the multiplicities of hard photons and free nucleons and their correlation are also investigated. We find that direct photon emission is positively related to free nucleons emission, however, there exists an anti-correlation for thermal photons with free nucleons.

各向异性流可以提供重离子碰撞中演化动力学的重要信息。系统地研究了硬核子和自由核子中的\（^ {40} \） Ca +  \（^ {40} \） Ca碰撞的有向流\（v_1 \）和椭圆流\（v_2 \）。异构体依赖性量子分子动力学（IQMD）模型的框架。研究首先揭示了在中能重离子碰撞中发射的热光子具有定向流动和椭圆形流动。\（v_1 \）和\（v_2 \）的入射能量依赖性的有趣现象对于中心碰撞中的热光子，也证实了它可以被视为演化动力学的良好探针。此外，还研究了硬光子和自由核子的多重性及其相关性。我们发现直接光子发射与自由核子发射正相关，但是，存在与热核子具有自由核子的反相关性。