Isospin splitting of nucleon effective mass and symmetry energy in isotopic nuclear reactions

  • Within an isospin and momentum dependent transport model, the dynamics of isospin particles (nucleons and light clusters) in Fermi-energy heavy-ion collisions are investigated for constraining the isospin splitting of nucleon effective mass and the symmetry energy at subsaturation densities. The impacts of the isoscalar and isovector parts of the momentum dependent interaction on the emissions of isospin particles are explored, i.e., the mass splittings of mn*=mp* and mn*>mp* (mn*<mp*). The single and double neutron to proton ratios of free nucleons and light particles are thoroughly investigated in the isotopic nuclear reactions of 112Sn+112Sn and 124Sn+124Sn at incident energies of 50 and 120 MeV/nucleon, respectively. It is found that both the effective mass splitting and symmetry energy impact the kinetic energy spectra of the single ratios, in particular at the high energy tail (larger than 20 MeV). The isospin splitting of nucleon effective mass slightly impacts the double ratio spectra at the energy of 50 MeV/nucleon. A soft symmetry energy with stiffness coefficient of γs=0.5 is constrained from the experimental data with the Fermi-energy heavy-ion collisions.
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Ya-Fei Guo, Peng-Hui Chen, Fei Niu, Hong-Fei Zhang, Gen-Ming Jin and Zhao-Qing Feng. Isospin splitting of nucleon effective mass and symmetry energy in isotopic nuclear reactions[J]. Chinese Physics C, 2017, 41(10): 104104. doi: 10.1088/1674-1137/41/10/104104
Ya-Fei Guo, Peng-Hui Chen, Fei Niu, Hong-Fei Zhang, Gen-Ming Jin and Zhao-Qing Feng. Isospin splitting of nucleon effective mass and symmetry energy in isotopic nuclear reactions[J]. Chinese Physics C, 2017, 41(10): 104104.  doi: 10.1088/1674-1137/41/10/104104 shu
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Received: 2017-06-21
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    Supported by Major State Basic Research Development Program in China (2014CB845405, 2015CB856903), National Natural Science Foundation of China (11722546, 11675226, 11675066, U1332207) and Youth Innovation Promotion Association of Chinese Academy of Sciences

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Isospin splitting of nucleon effective mass and symmetry energy in isotopic nuclear reactions

    Corresponding author: Zhao-Qing Feng,
  • 1. School of Nuclear Science and Technology, Lanzhou University, Lanzhou 730000, China
  • 2. Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
  • 3. Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
  • 4. University of Chinese Academy of Sciences, Beijing 100190, China
  • 5. Institute of Particle and Nuclear Physics, Henan Normal University, Xinxiang 453007, China
  • 6.  School of Nuclear Science and Technology, Lanzhou University, Lanzhou 730000, China
  • 7.  Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
Fund Project:  Supported by Major State Basic Research Development Program in China (2014CB845405, 2015CB856903), National Natural Science Foundation of China (11722546, 11675226, 11675066, U1332207) and Youth Innovation Promotion Association of Chinese Academy of Sciences

Abstract: Within an isospin and momentum dependent transport model, the dynamics of isospin particles (nucleons and light clusters) in Fermi-energy heavy-ion collisions are investigated for constraining the isospin splitting of nucleon effective mass and the symmetry energy at subsaturation densities. The impacts of the isoscalar and isovector parts of the momentum dependent interaction on the emissions of isospin particles are explored, i.e., the mass splittings of mn*=mp* and mn*>mp* (mn*<mp*). The single and double neutron to proton ratios of free nucleons and light particles are thoroughly investigated in the isotopic nuclear reactions of 112Sn+112Sn and 124Sn+124Sn at incident energies of 50 and 120 MeV/nucleon, respectively. It is found that both the effective mass splitting and symmetry energy impact the kinetic energy spectra of the single ratios, in particular at the high energy tail (larger than 20 MeV). The isospin splitting of nucleon effective mass slightly impacts the double ratio spectra at the energy of 50 MeV/nucleon. A soft symmetry energy with stiffness coefficient of γs=0.5 is constrained from the experimental data with the Fermi-energy heavy-ion collisions.

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