Symmetry energy from neutron-rich fragments in heavy-ion collisions, and its dependence on incident energy, and impact parameters

  • The yields of fragments produced in the 60Ni+12C reactions at 80 A and 140 A MeV, and with maximum impact parameters of 1.5, 2 and 7.3 fm at 80 A MeV are calculated by the statistical abrasion-ablation model. The yields of fragments are analyzed by the isobaric yield ratio (IYR) method to extract the coefficient of symmetry energy to temperature (asym/T). The incident energy is found to influence asym/T very little. It's found that asym/T of fragments with the same neutron-excess I=N-Z increases when A increases, while asym/T of isobars decreases when A increases. The asym/T of prefragments is rather smaller than that of the final fragments, and the asym/T of fragments in small impact parameters is smaller than that of the larger impact parameters, which both indicate that asym/T decreases when the temperature increases. The choice of the reference IYRs is found to have influence on the extracted asym/T of fragments, especially on the results of the more neutron-rich fragments. The surface-symmetry energy coefficient (bs/T) and the volume-symmetry energy coefficient (bv/T) are also extracted, and the bs/bv is found to coincide with the theoretical results.
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MA Chun-Wang, SONG Heng-Li, PU Jie, ZHANG Tong-Lin, ZHANG Sha, WANG Shan-Shan, ZHAO Xin-Li and CHEN Li. Symmetry energy from neutron-rich fragments in heavy-ion collisions, and its dependence on incident energy, and impact parameters[J]. Chinese Physics C, 2013, 37(2): 024102. doi: 10.1088/1674-1137/37/2/024102
MA Chun-Wang, SONG Heng-Li, PU Jie, ZHANG Tong-Lin, ZHANG Sha, WANG Shan-Shan, ZHAO Xin-Li and CHEN Li. Symmetry energy from neutron-rich fragments in heavy-ion collisions, and its dependence on incident energy, and impact parameters[J]. Chinese Physics C, 2013, 37(2): 024102.  doi: 10.1088/1674-1137/37/2/024102 shu
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Received: 2012-03-27
Revised: 1900-01-01
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Symmetry energy from neutron-rich fragments in heavy-ion collisions, and its dependence on incident energy, and impact parameters

    Corresponding author: MA Chun-Wang,

Abstract: The yields of fragments produced in the 60Ni+12C reactions at 80 A and 140 A MeV, and with maximum impact parameters of 1.5, 2 and 7.3 fm at 80 A MeV are calculated by the statistical abrasion-ablation model. The yields of fragments are analyzed by the isobaric yield ratio (IYR) method to extract the coefficient of symmetry energy to temperature (asym/T). The incident energy is found to influence asym/T very little. It's found that asym/T of fragments with the same neutron-excess I=N-Z increases when A increases, while asym/T of isobars decreases when A increases. The asym/T of prefragments is rather smaller than that of the final fragments, and the asym/T of fragments in small impact parameters is smaller than that of the larger impact parameters, which both indicate that asym/T decreases when the temperature increases. The choice of the reference IYRs is found to have influence on the extracted asym/T of fragments, especially on the results of the more neutron-rich fragments. The surface-symmetry energy coefficient (bs/T) and the volume-symmetry energy coefficient (bv/T) are also extracted, and the bs/bv is found to coincide with the theoretical results.

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