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 ›› 2020, Vol. 31 ›› Issue (7): 71 doi: 10.1007/s41365-020-00779-6

• NUCLEAR PHYSICS AND INTERDISCIPLINARY RESEARCH • Previous Articles     Next Articles

Examination of an isospin-dependent single-nucleon momentum distribution for isospin-asymmetric nuclear matter in heavy-ion collisions

Gao-Feng Wei 1,2  Qi-Jun Zhi 1,2 Xin-Wei Cao 3  Zheng-Wen Long 4   

  1. 1School of Physics and Electronic Science, Guizhou Normal University, Guiyang 550025, China
    2Guizhou Provincial Key Laboratory of Radio Astronomy and Data Processing, Guizhou Normal University, Guiyang 550025, China
    3School of Mechanical and Material Engineering, Xi’an University of Arts and Sciences, Xi’an 710065, China
    4College of Physics, Guizhou University, Guiyang 550025, China
  • Received:2020-03-05 Revised:2020-04-14 Accepted:2020-06-15
  • Contact: Gao-Feng Wei E-mail:wei.gaofeng@gznu.edu.cn
  • Supported by:
    This work was supported by the National Natural Science Foundation of China (Nos.11965008, 11405128,and U1731218), Guizhou Provincial Science and Technology Foundation (No.[2020]1Y034), the PhD-funded project of Guizhou Normal university (No.GZNUD[2018]11), and the Xi’an Science and Technology Planning project (No.CXY1531WL35).
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Gao-Feng Wei, Qi-Jun Zhi, Xin-Wei Cao, Zheng-Wen Long. Examination of an isospin-dependent single-nucleon momentum distribution for isospin-asymmetric nuclear matter in heavy-ion collisions.Nuclear Science and Techniques, 2020, 31(7): 71     doi: 10.1007/s41365-020-00779-6
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Abstract: Within a transport model using nucleon momentum profiles as the input from a parameterized isospin- dependent single-nucleon momentum distribution, with a high momentum tail induced by short-range corre- lations, we employ 197Au + 197Au collisions at 400 MeV/nucleon to examine the effects of the short-range cor- relations on the pion and flow observables in probing the nuclear symmetry energy. We investigate how reliable this isospin-dependent single-nucleon momentum distribution is and determine the corresponding parameter settings. Apart from the significant effects of the short-range correlations on the pion and flow observables that are observed, we also find that the theoretical simulations of the 197Au + 197Au collisions with this momen- tum distribution using two sets of parameters, extracted from the experimental analysis and the self-consistent Green’s function prediction, can reproduce the neutron elliptic flows of the FOPI-LAND experiment and the π−/π+ ratios of the FOPI experiment, respectively, under the symmetry energy setting in a particular range. Therefore, we conclude that this parameterized isospin-dependent single-nucleon momentum distribution is re- liable for isospin-asymmetric nuclear matter. Correspondingly, two sets of parameters extracted from both the experimental analysis and the self-consistent Green’s function prediction cannot be excluded according to the available experimental information at present.

Key words: Single-nucleon momentum distribution, Isospin-asymmetric nuclear matter, Short-range correlations, Heavy-ion collisions, Symmetry energy