Pion production in a transport model based on mean fields from chiral effective field theory
Pion production in a transport model based on mean fields from chiral effective field theory
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DOI：
10.1103/physrevc.98.054614
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发表时间：
2018-11
影响因子：
3.1
通讯作者：
Zhen Zhang;C. Ko
中科院分区：
文献类型：
--
作者：
Zhen Zhang;C. Ko
We develop a Boltzmann-Uehling-Uhlenbeck (BUU) transport model based on theenergy density functional, which is constructed from fitting the nuclear equation of state and nucleon effective masses in asymmetric nuclear matter predicted by the two- and three-body chiral interactions as well as the binding energies of finite nuclei. This newtransport model is then used to study how baryon mean-field potentials affect the kinematics of a scattering or decay process and the equilibrium properties of a hotsystem in a box with periodic boundary conditions. We find that the inclusion of mean-field potentials in the energy conservation condition for scattering and decay processes is necessary to maintain the equilibrium numbers of, and. Although the baryon mean-field potentials have significant effects on the totalandnumbers, they only slightly affect the ratio of effective negatively to positively charged pions. We also study pion production in centralcollisions at the incident energy ofMeV and compare the results with the experimental data from the Four Pi (FOPI) Collaboration at the Gesellschaft für Schwerionenforschung mbH (GSI) in Germany. We find that our model can well describe the experimental results and the threshold effect due to baryon mean-field potentials does not affect much the charged pion ratio in this model. We further make predictions on pion production for the ongoing experiments ofandat the incident energy ofMeV by the SAMURAI Pion-Reconstruction and Ion-Tracker () Collaboration at the Institute of Physical and Chemical Research (RIKEN) in Japan.
