Effects of retarded electrical fields on observables sensitive to the high-density behavior of the nuclear symmetry energy in heavy-ion collisions at intermediate energies
Abstract
Within the isospin- and momentum-dependent transport model IBUU11, we examine here the relativistic retardation effects of electrical fields on the π- / π+ ratio and neutron-proton differential transverse flow in heavy-ion collisions at intermediate energies. Compared to the static Coulomb fields, the retarded electric fields of fast-moving charges are known to be anisotropic and the associated relativistic corrections can be significant. They are found to increase the number of energetic protons in the participant region at the maximum compression by as much as 25% but that of energetic neutrons by less than 10% in 197Au + 197Au reactions at a beam energy of 400 MeV/nucleon. Consequently, more π+ and relatively fewer π- mesons are produced, leading to an appreciable reduction of the π- / π+ ratio compared to calculations with the static Coulomb fields. Also, the neutron-proton differential transverse flow, as another sensitive probe of high-density symmetry energy, is also decreased appreciably due to the stronger retarded electrical fields in directions perpendicular to the velocities of fast-moving charges compared to calculations using the isotropic static electrical fields. Moreover, the retardation effects on these observables are found to be approximately independent of the reaction impact parameter.
- Authors:
-
[2];
- Xi'an Univ. of Arts and Science, Xi'an (China)
- Texas A & M Univ., Commerce, TX (United States)
- Chinese Academy of Sciences (CAS), Lanzhou (China)
- Guangxi Normal Univ., Guilin (China); Guangxi Key Lab. Breeding Base of Nuclear Physics and Technology, Guilin (China)
- Bohai Univ., Jinzhou (China)
- Publication Date:
- Research Org.:
- Texas A & M Univ., Commerce, TX (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Nuclear Physics (NP); National Natural Science Foundation of China (NSFC); Natural Science Foundation of Guangxi
- OSTI Identifier:
- 1658220
- Alternate Identifier(s):
- OSTI ID: 1429566
- Grant/Contract Number:
- SC0013702; SC0009971; 11320101004; 11405128; 11375239; 11365004; 2016GXNSFFA380001
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review C
- Additional Journal Information:
- Journal Volume: 97; Journal Issue: 3; Journal ID: ISSN 2469-9985
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 73 NUCLEAR PHYSICS AND RADIATION PHYSICS; collective flow; low & intermediate energy heavy-ion reactions; models & methods for nuclera reactions; nuclear many-body theory; symmetry energy; unstable nuclei induced nuclear reactions
Citation Formats
Wei, Gao-Feng, Li, Bao-An, Yong, Gao-Chan, Ou, Li, Cao, Xin-Wei, and Liu, Xu-Yang. Effects of retarded electrical fields on observables sensitive to the high-density behavior of the nuclear symmetry energy in heavy-ion collisions at intermediate energies. United States: N. p., 2018.
Web. doi:10.1103/physrevc.97.034620.
Wei, Gao-Feng, Li, Bao-An, Yong, Gao-Chan, Ou, Li, Cao, Xin-Wei, & Liu, Xu-Yang. Effects of retarded electrical fields on observables sensitive to the high-density behavior of the nuclear symmetry energy in heavy-ion collisions at intermediate energies. United States. https://doi.org/10.1103/physrevc.97.034620
Wei, Gao-Feng, Li, Bao-An, Yong, Gao-Chan, Ou, Li, Cao, Xin-Wei, and Liu, Xu-Yang. Mon .
"Effects of retarded electrical fields on observables sensitive to the high-density behavior of the nuclear symmetry energy in heavy-ion collisions at intermediate energies". United States. https://doi.org/10.1103/physrevc.97.034620. https://www.osti.gov/servlets/purl/1658220.
@article{osti_1658220,
title = {Effects of retarded electrical fields on observables sensitive to the high-density behavior of the nuclear symmetry energy in heavy-ion collisions at intermediate energies},
author = {Wei, Gao-Feng and Li, Bao-An and Yong, Gao-Chan and Ou, Li and Cao, Xin-Wei and Liu, Xu-Yang},
abstractNote = {Within the isospin- and momentum-dependent transport model IBUU11, we examine here the relativistic retardation effects of electrical fields on the π- / π+ ratio and neutron-proton differential transverse flow in heavy-ion collisions at intermediate energies. Compared to the static Coulomb fields, the retarded electric fields of fast-moving charges are known to be anisotropic and the associated relativistic corrections can be significant. They are found to increase the number of energetic protons in the participant region at the maximum compression by as much as 25% but that of energetic neutrons by less than 10% in 197Au + 197Au reactions at a beam energy of 400 MeV/nucleon. Consequently, more π+ and relatively fewer π- mesons are produced, leading to an appreciable reduction of the π- / π+ ratio compared to calculations with the static Coulomb fields. Also, the neutron-proton differential transverse flow, as another sensitive probe of high-density symmetry energy, is also decreased appreciably due to the stronger retarded electrical fields in directions perpendicular to the velocities of fast-moving charges compared to calculations using the isotropic static electrical fields. Moreover, the retardation effects on these observables are found to be approximately independent of the reaction impact parameter.},
doi = {10.1103/physrevc.97.034620},
journal = {Physical Review C},
number = 3,
volume = 97,
place = {United States},
year = {Mon Mar 26 00:00:00 EDT 2018},
month = {Mon Mar 26 00:00:00 EDT 2018}
}
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