Nuclear Science and Techniques

《核技术》(英文版) ISSN 1001-8042 CN 31-1559/TL     2019 Impact factor 1.556

Nuclear Science and Techniques ›› 2013, Vol. 24 ›› Issue (5): 050504 doi: 10.13538/j.1001-8042/nst.2013.05.004

Special Issue: Special Section on International Workshop on Nuclear Dynamics in Heavy-Ion Reaction (IWND2012)

• Special Section on International Workshop on Nuclear Dynamics in Heavy-Ion Reaction (IWND2012) • Previous Articles     Next Articles

 Isospin splitting of nucleon effective mass and isospin effect in heavy-ion collisions  

FENG Zhaoqing*   

  1. Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
  • Contact: FENG Zhaoqing E-mail:fengzhq@impcas.ac.cn
  • Supported by:

    Supported by National Natural Science Foundation of China (NSFC) projects (No. 11175218) and the Advancement Society of Young Innovation of Chinese Academy of Sciences.

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FENG Zhaoqing.  Isospin splitting of nucleon effective mass and isospin effect in heavy-ion collisions  .Nuclear Science and Techniques, 2013, 24(5): 050504     doi: 10.13538/j.1001-8042/nst.2013.05.004

Abstract:

Two different isospin splittings of nucleon effective mass in nuclear medium as the form of mn*>mp*  and mn*<mp*  have been implemented in an isospin and momentum dependent transport model. Their impacts on the isospin emission in heavy-ion collisions is investigated thoroughly. It is found that the yield ratios of energetic neutrons to protons squeezed out during the compression stage of two colliding nuclides are sensitive to the isospin splitting. The elliptic flows of free nucleons are also to be promising observables for extracting the nucleon effective mass splitting. Further experimental measurements are being expected, in particular at the CSR-CEE platform in Lanzhou. Several observables are proposed for constraining the density dependence of symmetry energy, such as the transverse flow difference of neutrons and protons, double ratios of n/p and π/π+, excitation functions of π/π+ and K0/K+.

Key words: Isospin splitting, Nucleon effective mass, Collective flows, Symmetry energy