Revisiting Angular Momentum Conservation in Transport Simulations of Intermediate-Energy Heavy-Ion Collisions

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.

Automated summary

Based on the well-calibrated IBUU transport model, the dynamical effect of incorporating rigorous angular momentum conservation in each collision of particles has been studied. Two typical prescriptions were compared with the original one for handling the constraint of rigorous angular momentum conservation. Although the results depend quantitatively on the choice of the prescription, it was found that angular momentum conservation generally reduces local density fluctuations, collision rate, and may have an influence on density evolution, collective flow, and pion production in transport simulations of intermediate-energy heavy-ion collisions.