Influence of differential elastic nucleon-nucleon cross section on stopping and collective flow in heavy-ion collisions at intermediate energies

Yongjia Wang, Chenchen Guo, Qingfeng Li, Zhuxia Li, Jun Su, and Hongfei Zhang
Phys. Rev. C 94, 024608 – Published 10 August 2016

Abstract

We considered three different nucleon-nucleon (NN) elastic differential cross sections: the Cugnon et al. parameterized differential cross section [Nucl. Instrum. Methods Phys. Res., Sect. B 111, 215 (1996)], the differential cross section derived from the collision term of the self-consistent relativistic Boltzmann-Uehling-Uhlenbeck equation proposed by Mao et al. [Z. Phys. A 347, 173 (1994)], and the isotropic differential cross section within the newly updated version of the ultrarelativistic quantum molecular dynamics (UrQMD) model. By doing so, we investigated the influence of the differential elastic NN cross section on various observables (e.g., nuclear stopping, both the rapidity and transverse-velocity dependence of the directed and elliptic flows) in Au+Au collisions at beam energies 150, 250, 400, and 800MeV/nucleon. By comparing calculations with those three differential cross sections, we found that the nuclear stopping power and the directed and elliptic flows are affected to some extent by the differential cross sections, and the impact of differential cross section on those observables becomes more visible as the beam energy increases. The effect on the elliptic flow difference v2nv2H and ratio v2n/v2H of neutrons versus hydrogen isotopes (Z=1), which have been used as sensitive observables for probing nuclear symmetry energy at high densities, is weak.

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  • Received 24 January 2016
  • Revised 4 July 2016

DOI:https://doi.org/10.1103/PhysRevC.94.024608

©2016 American Physical Society

Physics Subject Headings (PhySH)

Nuclear Physics

Authors & Affiliations

Yongjia Wang1,*, Chenchen Guo1,2, Qingfeng Li1,†, Zhuxia Li3, Jun Su4, and Hongfei Zhang5

  • 1School of Science, Huzhou University, Huzhou 313000, China
  • 2Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China
  • 3China Institute of Atomic Energy, Beijing 102413, China
  • 4Sino-French Institute of Nuclear Engineering and Technology, Sun Yat-sen University, Zhuhai 519082, China
  • 5School of Nuclear Science and Technology, Lanzhou University, Lanzhou 730000, China

  • *wangyongjia@zjhu.edu.cn
  • liqf@zjhu.edu.cn

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Vol. 94, Iss. 2 — August 2016

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