Effect of High Momentum Distribution on Nuclear Stopping in Nuclear Reaction
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摘要: 利用同位旋相关的量子分子动力学模型研究了中能重离子碰撞过程中，具有不同中质比的中等质量核碰撞系统的高动量分布对原子核的阻止本领的影响，以及这种影响随入射能量的演化。研究结果表明：对于76Kr+76Kr，88Kr+88Kr碰撞系统，当入射能量较小时高动量分布对原子核的阻止本领影响很小；但当反应能量较大的时候，高动量分布对原子核的阻止本领影响较大，且这种影响随着入射能量和碰撞核质量的增大而增大。对于Ca同位素链的反应系统，高动量分布增大了反应系统的原子核的阻止本领。因此，高动量分布对中等质量核碰撞系统的原子核的阻止本领有重要影响，且与入射能量和碰撞核质量密切相关。
Based on the isospin-dependent quantum molecular dynamics model, the effect of high momentum distribution on nuclear stopping in medium mass nuclear collision system is studied with different neutron-proton ratio in intermediate energy heavy ion collisions, and the evolution of this effect with the incident energy. The results show that when the incident energy is small, the high momentum distribution has little effect on the nuclear stopping. However, when the reaction energy is large, the high momentum distribution has a great influence on the nuclear stopping and the influence increases with the increase of incident energy and the mass of collision nucleus. For the Ca isotopes reaction system, high momentum distribution increases the nuclear stopping of the reaction system. Therefore, high momentum distribution has an important influence on nuclear stopping in medium mass nuclear collision system, and closely related to the incident energy and the mass of collision nucleus.Abstract: Based on the isospin-dependent quantum molecular dynamics model, the effect of high momentum distribution on nuclear stopping in medium mass nuclear collision system is studied with different neutron-proton ratio in intermediate energy heavy ion collisions, and the evolution of this effect with the incident energy. The results show that when the incident energy is small, the high momentum distribution has little effect on the nuclear stopping. However, when the reaction energy is large, the high momentum distribution has a great influence on the nuclear stopping and the influence increases with the increase of incident energy and the mass of collision nucleus. For the Ca isotopes reaction system, high momentum distribution increases the nuclear stopping of the reaction system. Therefore, high momentum distribution has an important influence on nuclear stopping in medium mass nuclear collision system, and closely related to the incident energy and the mass of collision nucleus. -
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