Probing nuclear symmetry energy at high densities using pion, kaon, eta and photon productions in heavy-ion collisions

  • Zhi-Gang Xiao
  • Gao-Chan Yong
  • Lie-Wen Chen
  • Bao-An Li
  • Ming Zhang
  • Guo-Qing Xiao
  • Nu Xu
Review

DOI: 10.1140/epja/i2014-14037-6

Cite this article as:
Xiao, ZG., Yong, GC., Chen, LW. et al. Eur. Phys. J. A (2014) 50: 37. doi:10.1140/epja/i2014-14037-6
Part of the following topical collections:
  1. Topical issue on Nuclear Symmetry Energy

Abstract.

The high-density behavior of nuclear symmetry energy is among the most uncertain properties of dense neutron-rich matter. Its accurate determination has significant ramifications in understanding not only the reaction dynamics of heavy-ion reactions, especially those induced by radioactive beams, but also many interesting phenomena in astrophysics, such as the explosion mechanism of supernova and the properties of neutron stars. The heavy-ion physics community has devoted much effort during the last few years to constrain the high-density symmetry using various probes. In particular, the \( \pi^{-}\)/\( \pi^{+}\) ratio has been most extensively studied both theoretically and experimentally. All models have consistently predicted qualitatively that the \( \pi^{-}\)/\( \pi^{+}\) ratio is a sensitive probe of the high-density symmetry energy especially with beam energies near the pion production threshold. However, the predicted values of the \( \pi^{-}\)/\( \pi^{+}\) ratio are still quite model dependent mostly because of the complexity of modeling pion production and reabsorption dynamics in heavy-ion collisions, leading to currently still controversial conclusions regarding the high-density behavior of nuclear symmetry energy from comparing various model calculations with available experimental data. As more \( \pi^{-}\)/\( \pi^{+}\) data become available and a deeper understanding about the pion dynamics in heavy-ion reactions is obtained, more penetrating probes, such as the K+/K0 ratio, \( \eta\) meson and high-energy photons are also being investigated or planned at several facilities. Here, we review some of our recent contributions to the community effort of constraining the high-density behavior of nuclear symmetry energy in heavy-ion collisions. In addition, the status of some worldwide experiments for studying the high-density symmetry energy, including the HIRFL-CSR external target experiment (CEE) are briefly introduced.

Copyright information

© SIF, Springer-Verlag Berlin Heidelberg 2014

Authors and Affiliations

  • Zhi-Gang Xiao
    • 1
    • 2
  • Gao-Chan Yong
    • 3
  • Lie-Wen Chen
    • 4
  • Bao-An Li
    • 5
  • Ming Zhang
    • 6
  • Guo-Qing Xiao
    • 3
  • Nu Xu
    • 7
  1. 1.Department of PhysicsTsinghua UniversityBeijingChina
  2. 2.Collaborative Innovation Center of Quantum MatterBeijingChina
  3. 3.Institute of Modern PhysicsChinese Academy of SciencesLanzhouChina
  4. 4.Department of Physics and AstronomyShanghai Jiao Tong UniversityShanghaiChina
  5. 5.Department of Physics and AstronomyTexas A&M University-CommerceTexasUSA
  6. 6.National Institute of MetrologyBeijingChina
  7. 7.Institute of Particle PhysicsCentral China Normal UniversityWuhanChina

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