Insights into the pion production mechanism and the symmetry energy at high density

doi:10.1103/PhysRevC.103.014616

	Insights into the pion production mechanism and the symmetry energy at high density
	Liu, Yangyang 4; Wang, Yongjia 5; Cui, Ying 4; Xia, Cheng-Jun 1; Li, Zhuxia 4; Chen, Yongjing 4; Li, Qingfeng 2,5; Zhang, Yingxun 3,4
刊名	PHYSICAL REVIEW C
	2021-01-29
卷号	103 期号:1 页码:11
ISSN号	2469-9985
DOI	10.1103/PhysRevC.103.014616
通讯作者	Li, Qingfeng(liqf@zjhu.edu.cn)
英文摘要	The pion production mechanism is explored based on the ultrarelativistic quantum molecular dynamics model (UrQMD) in which the Delta-mass dependence of the M matrix and Delta-mass dependence of the momentum p(N Delta) in N Delta -> NN cross sections are taken into account. By analyzing the time evolution of the pion production rate and the density in the overlapped region for the reaction of Au+Au at the beam energy of 0.4A GeV, we find that characteristic density of pion observable is in the region of 1-2 times normal density. The process of pion production in the reaction is tracked, including the loops of NN <-> N Delta and A <-> N pi, and our calculations show that the sensitivity of pi(-)/pi(+) to symmetry energy is weakened after 4-5 N-Delta-pi loops in the pion production path. The pi(-)/pi(+) ratio in the reaction near the threshold energies retains its sensitivity to the symmetry energy, and it is insensitive to the nuclear incompressibility K-0 and effective mass when their values are selected in the commonly accepted range. By comparing the UrQMD calculations to the FOPI data at 0.4A GeV and considering the constraint of symmetry energy from neutron star properties, the slope of symmetry energy L = 54-91 MeV and the symmetry energy at two times normal density S(2(rho)(0)) = 48-59 MeV are deduced, and they are also consistent with the constraint from the ASY-EOS flow data.
资助项目	National Natural Science Foundation of China[11790325] ; National Natural Science Foundation of China[11875323] ; National Natural Science Foundation of China[11875125] ; National Natural Science Foundation of China[U2032145] ; National Natural Science Foundation of China[12047568] ; National Natural Science Foundation of China[11705163] ; National Natural Science Foundation of China[11790320] ; National Natural Science Foundation of China[11790323] ; National Natural Science Foundation of China[11961141003] ; National Key R&D Program of China[2018 YFA0404404] ; Continuous Basic Scientific Research Project[WDJC-2019-13] ; Continuous Basic Scientific Research Project[BJ20002501] ; China Institute of Atomic Energy ; Ten-Thousand Talent Program of Zhejiang Province ; National Key Research and Development Program of China[2020YFE0202002] ; Chinese-Polish Joint Project by National Science Foundation of China[11961131010] ; Huzhou University
WOS关键词	HEAVY-ION COLLISIONS ; EQUATION-OF-STATE ; MATTER ; DEPENDENCE ; CONSTRAINTS
WOS研究方向	Physics
语种	英语
出版者	AMER PHYSICAL SOC
WOS记录号	WOS:000613141500004
资助机构	National Natural Science Foundation of China ; National Key R&D Program of China ; Continuous Basic Scientific Research Project ; China Institute of Atomic Energy ; Ten-Thousand Talent Program of Zhejiang Province ; National Key Research and Development Program of China ; Chinese-Polish Joint Project by National Science Foundation of China ; Huzhou University
内容类型	期刊论文
源URL	[http://119.78.100.186/handle/113462/137915]
专题	中国科学院近代物理研究所
通讯作者	Li, Qingfeng
作者单位	1.Zhejiang Univ, Sch Informat Sci & Engn, Ningbo Inst Technol, Ningbo 315100, Peoples R China 2.Chinese Acad Sci, Inst Modern Phys, Lanzhou 730000, Peoples R China 3.Guangxi Normal Univ, Guangxi Key Lab Nucl Phys & Technol, Guilin 541004, Peoples R China 4.China Inst Atom Energy, Beijing 102413, Peoples R China 5.Huzhou Univ, Sch Sci, Huzhou 313000, Peoples R China
推荐引用方式 GB/T 7714	Liu, Yangyang,Wang, Yongjia,Cui, Ying,et al. Insights into the pion production mechanism and the symmetry energy at high density[J]. PHYSICAL REVIEW C,2021,103(1):11.
APA	Liu, Yangyang.,Wang, Yongjia.,Cui, Ying.,Xia, Cheng-Jun.,Li, Zhuxia.,...&Zhang, Yingxun.(2021).Insights into the pion production mechanism and the symmetry energy at high density.PHYSICAL REVIEW C,103(1),11.
MLA	Liu, Yangyang,et al."Insights into the pion production mechanism and the symmetry energy at high density".PHYSICAL REVIEW C 103.1(2021):11.