Comparison of Heavy-Ion Transport Simulations: Mean-field Dynamics in a Box
Abstract
Within the transport model evaluation project (TMEP) of simulations for heavy-ion collisions, the mean-field response is examined here. Specifically, zero-sound propagation is considered for neutron-proton symmetric matter enclosed in a periodic box, at zero temperature and around normal density. The results of several transport codes belonging to two families (BUU-like and QMD-like) are compared among each other and to exact calculations. For BUU-like codes, employing the test particle method, the results depend on the combination of the number of test particles and the spread of the profile functions that weight integration over space. These parameters can be properly adapted to give a good reproduction of the analytical zero-sound features. QMD-like codes, using molecular dynamics methods, are characterized by large damping effects, attributable to the fluctuations inherent in their phase-space representation. Moreover, for a given nuclear effective interaction, they generally lead to slower density oscillations, as compared to BUU-like codes. The latter problem is mitigated in the more recent lattice formulation of some of the QMD codes. The significance of these results for the description of real heavy-ion collisions is discussed.
Keywords
Cite
@article{arxiv.2106.12287,
title = {Comparison of Heavy-Ion Transport Simulations: Mean-field Dynamics in a Box},
author = {Maria Colonna and Ying-Xun Zhang and Yong-Jia Wang and Dan Cozma and Pawel Danielewicz and Che Ming Ko and Akira Ono and Manyee Betty Tsang and Rui Wang and Hermann Wolter and Jun Xu and Zhen Zhang and Lie-Wen Chen and Hui-Gan Cheng and Hannah Elfner and Zhao-Qing Feng and Myungkuk Kim and Youngman Kim and Sangyong Jeon and Chang-Hwan Lee and Bao-An Li and Qing-Feng Li and Zhu-Xia Li and Swagata Mallik and Dmytro Oliinychenko and Jun Su and Taesoo Song and Agnieszka Sorensen and Feng-Shou Zhang},
journal= {arXiv preprint arXiv:2106.12287},
year = {2021}
}