中能重离子碰撞输运模拟中angular momentum守恒的再研究
Revisiting angular momentum conservation in transport simulations of intermediate-energy heavy-ion collisions
摘要：
基于经过良好校准的IBUU输运模型，我们研究了在每次粒子碰撞中加入严格的角动量守恒的动力学效应。严格的角动量守恒的约束要求粒子发生面内碰撞和碰撞后的侧向跳跃。由于这一方案不是唯一的，我们将两个典型的方案与原来的方案进行了比较。虽然结果定量地依赖于处方的选择，我们发现，角动量守恒一般减少局部密度波动，从而碰撞率，并可能有一些影响的密度演化，集体流，甚至π介子生产中能重离子碰撞的输运模拟。
英文摘要：
Based on the well-calibrated IBUU transport model, we have studied the dynamical effect of incorporating rigorous angular momentum conservation in each collision of particles with homework setups. The constraint of the rigorous angular momentum conservation requires in-plane collisions and side jumps of particles after their collision. Since the option is not unique, we have compared two typical prescriptions with the original one. While the results depend quantitatively on the choice of the prescription, we found that the angular momentum conservation generally reduces local density fluctuations and thus the collision rate, and may have some influence on the density evolution, the collective flow, and even the pion production in transport simulations of intermediate-energy heavy-ion collisions.
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