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本研究基于量子分子动力学模型，以核子轫致辐射光子为探针，系统研究了高动量分布（HMT）对核反应系统的影响，并探讨了这种影响与入射能量、碰撞参数及同位旋相关核子-核子碰撞截面的关系.研究结果表明：在入射能量为50 MeV/u时，从轻到重的反应系统，含HMT的系统在高能区的光子密度均显著高于无HMT的系统，而在低能区两者差异不明显.此外，在对心碰撞中，光子能量改变现象随入射能量的增加而增强，并在E=150 MeV/u时达到峰值.这一由HMT引起的能量移动现象在碰撞参数b=0 fm至b=6 fm范围内普遍存在.进一步分析表明，同位旋相关核子-核子碰撞截面的引入会改变系统的碰撞概率，而HMT通过影响核子间相互作用进一步调制了这一过程.综上所述，高动量分布对核反应系统具有重要影响，其效应与入射能量和同位旋相关核子-核子碰撞截面密切相关.This study employs semi-classical quantum molecular dynamics to investigate the influence of high momentum distribution on nuclear reaction systems, using photons produced by nucleon bremsstrahlung as indicators. The research examines the relationship between this influence and the incident energy, collision parameters, and the differences in isotopic spin cross-sections. Under the condition of a 20% high-momentum distribution and with nuclear energy conservation ensured, a system distinct from conventional configurations is constructed by sampling neutrons and protons via the Monte Carlo method, with the selected nucleons exhibiting characteristics of high-momentum nucleons. The effects of high-momentum distributions within nuclei on bremsstrahlung photons are analyzed through results of heavy-ion collisions across nuclear systems spanning light to heavy species. The results indicate that for the collision systems studied, at an incident energy of 50 MeV/u, for nuclear systems of varying masses—ranging from the light-mass system (18O+18O), the lower-mass system (46Ca+46Ca), the medium-mass system (86Kr+86Sr), to the heavy-mass system (124Sn+124Sn) exhibit higher photon densities in the high-energy region for high momentum distribution systems compared to conventional systems, while the photon density in the low-energy region shows no significant difference. At a collision parameter b=0 fm, the energy shift phenomenon of photons produced by collisions becomes more pronounced with increasing incident energy, peaking at E=150 MeV/u. This energy shift phenomenon induced by high momentum distribution is generally present across collision parameters ranging from b=0 fm to b=6 fm. When considering isotopic spin cross-sections, high momentum distribution affects the collision probability of the system. Therefore, high momentum distribution has a significant impact on nuclear reaction systems, closely related to incident energy and isotopic spin cross-sections.
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Keywords:
- high-momentum distribution /
- heavy-ion collision /
- spectrum /
- isospin effect
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