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

doi:10.1007/s41365-020-00779-6

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

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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

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

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

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Nuclear Science and Techniques

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

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