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In this work, semi-classical quantum molecular dynamics is used to investigate the influence of high momentum distribution on nuclear reaction systems by 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 ensuring the conservation of nuclear energy, a system different from traditional configurations is constructed by sampling neutrons and protons using the Monte Carlo method, with the selected nucleons exhibiting characteristics of high-momentum nucleons. The influence of high-momentum distribution within the nucleus on bremsstrahlung photons is analyzed through the collision results of heavy ions in nuclear systems spanning from light to heavy species. The results indicate that, at an incident energy value of 50 MeV/u, the collision system studied in this work exhibits higher photon density in the high-energy region of high momentum distribution system than traditional system for nuclear systems ranging from light-mass system (18O+18O), lower-mass system (46Ca+46Ca), and medium-mass system (86Kr+86Sr) to heavy-mass system (124Sn+124Sn), than those, while there is no significant difference in photon density in the low-energy region. At a collision parameter b = 0 fm, the energy shift phenomenon of photons produced by collisions becomes more pronounced with the increase of incident energy, peaking at E = 150 MeV/u. This energy transfer phenomenon induced by high momentum distribution typically exists within the collision parameter range from b = 0 fm to b = 6 fm. When considering isotopic spin cross-sections, high momentum distribution can affect the collision probability of the system. Therefore, high momentum distribution has a significant influence on nuclear reaction system, closely related to incident energy and isotopic spin cross-section.
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Keywords:
- high-momentum distribution /
- heavy-ion collision /
- spectrum /
- isospin effect
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图 1 86Kr核内动量分布
Figure 1. Nuclear momentum distribution in 86Kr.
图 2 不同质量核系统在中心碰撞中产生的光子能量分布, 分别考虑(HM)和不考虑高动量分布(NH)的情况
Figure 2. Photon energy distribution in central collisions of nuclear systems with different masses, considering and not considering high-momentum distributions.
图 3 较轻质量核系统和中等质量核系统中高动量分布系统与常规系统的光子密度比与光子能量的关系
Figure 3. Relationship between the photon density ratio and photon energy for high-momentum distribution systems versus conventional systems in lower-mass and medium-mass nuclear systems.
图 4 中等质量核系统在中心碰撞中产生的光子相对数量与入射能量的关系
Figure 4. Relationship between the relative number of photons produced in central collisions and the incident energy for a medium-mass nuclear system.
图 5 中等质量核系统碰撞参数与碰撞产生的光子相对数量的关系
Figure 5. Relationship between the collision parameter and the relative number of photons produced in collisions for a medium-mass nuclear system.
图 6 不同中质量和较轻质量核系统在中心碰撞中产生的低能和高能光子相对数量的关系, 分别考虑和不考虑高动量分布的情况
Figure 6. Relationship between the relative number of low-energy and high-energy photons produced in central collisions, considering and not considering high-momentum distribution, across different medium-mass and lower-mass nuclear systems.
图 7 不同核碰撞系统碰撞过程中同位旋效应差异性在高动量分布的影响下产生光子相对数量的关系
Figure 7. Relationship between the relative photon yield and the impact of high-momentum distribution on isospin effect differences in collisions of different nuclear systems.
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