# 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 (8): 77

• NUCLEAR PHYSICS AND INTERDISCIPLINARY RESEARCH •

### Probing neutron–proton effective mass splitting using nuclear stopping and isospin mix in heavy-ion collisions in GeV energy region

Fan Zhang1 • Jun Su2

1. 1 Department of Electronic Information and Physics, Changzhi University, Changzhi 046011, China
2 Sino-French Institute of Nuclear Engineering and Technology, Sun Yat-sen University, Zhuhai 519082, China
• Received:2020-03-16 Revised:2020-05-30 Accepted:2020-06-02
• Contact: Fan Zhang E-mail:zhangfan@mail.bnu.edu.cn
• Supported by:
This work was supported by the National Natural Science Foundation of China (Nos. 11905018 and 11875328), and the Scientific and Technological Innovation Programs of Higher Education Institutions of Shanxi Province, China (No. 2019L0908).
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Fan Zhang, Jun Su. Probing neutron–proton effective mass splitting using nuclear stopping and isospin mix in heavy-ion collisions in GeV energy region.Nuclear Science and Techniques, 2020, 31(8): 77
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Abstract: The ramifications of the effective mass splitting on the nuclear stopping and isospin tracer during heavy-ion collisions within the gigaelectron volt energy region are studied using an isospin-dependent quantum molecular dynamics model. Three isotope probes, i.e., a proton, deuteron, and triton, are used to calculate the nuclear stopping. Compared to the mn* > mp* case, the mn* < mp* parameter results in a stronger stopping for protons but a weaker stopping for tritons. The calculations of the isospin tracer show that the mn*> mp* parameter results in a higher isospin mix than the mn* < mp* parameter. The rapidity and impact parameter dependences of the isospin tracer are also studied. A constraining of the effective mass splitting using the free nucleons with high rapidity and in a central rather than peripheral collision is suggested.