Nuclear Science and Techniques

《核技术》(英文版) ISSN 1001-8042 CN 31-1559/TL     2018 Impact factor 0.961

Nuclear Science and Techniques ›› 2013, Vol. 24 ›› Issue (5): 050510 doi: 10.13538/j.1001-8042/nst.2013.05.010

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

Temperature and symmetry energy of neutron-rich fragments in the 1A GeV 124,136Xe+Pb reactions  

MA Chunwang*   QIAO Chunyuan   WANG Shanshan   LU Fangmei#br#  CHEN Li   GUO Meiting   

  1. Institute of Particle and Nuclear Physics,Henan Normal University, Xinxiang453007, China  
  • Received:2013-06-27
  • Contact: MA Chunwang E-mail:machunwang@126.com
  • Supported by:

    Supported by National Natural Science Foundation of China (NSFC) Projects (No.10905017), the Program for Science & Technology Innovation Talents in Universities of Henan Province (No.2013HASTIT046), and the Young Teacher Project in Henan Normal University.

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MA Chunwang, QIAO Chunyuan, WANG Shanshan, LU Fangmei, CHEN Li, GUO Meiting. Temperature and symmetry energy of neutron-rich fragments in the 1A GeV 124,136Xe+Pb reactions  .Nuclear Science and Techniques, 2013, 24(5): 050510     doi: 10.13538/j.1001-8042/nst.2013.05.010

Abstract:

In this work we study the symmetry-energy coefficient of neutron-rich nuclei, and the temperature dependence of nuclear symmetry energy at low temperatures. An isobaric method is used to extract the symmetry-energy coefficients of neutron-rich nucleus (asym) at zero temperature (T) and asym/T at nonzero temperature in the measured 1A GeV 124,136Xe+Pb reactions. T of fragment is obtained from the ratio of its asym to asym/T. The results show that, for fragment with the same neutron-excess (I=N–Z), the heavier the fragment is, the higher T it has, and T tends to saturate around 1 MeV for the large mass fragments. It is also shown that the more neutron-rich the isobar is, the higher temperature it has. The T2 dependence of symmetry energy of finite nucleus at low temperatures is verified by the extracted results.

Key words: Temperature, Symmetry energy, Isobaric yield ratio, Neutron-rich nucleus