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Yield ratios and directed flows of light particles from proton-rich nuclei-induced collisions

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Abstract

The neutron-to-proton and \({}^3{\hbox {H}}\)-to-\({}^3{\hbox {He}}\) yield ratios, and the directed flows of particles dependent on a reduced rapidity, the transverse momentum per nucleon, and a reduced impact parameter are investigated for \({}^{28}{\hbox {S}} + {}^{28}{\hbox {Si}}\) and \({}^{32}{\hbox {S}} + {}^{28}{\hbox {Si}}\) systems at 50 and 400 MeV/u using an isospin-dependent quantum molecular dynamics model. The results show that these yield ratios of projectile-like fragments are approximately equal to the constituent neutron-to-proton ratio of the projectile. There are clear differences of the directed flows for isospin-related fragments neutron and proton, \({}^3{\hbox {H}}\) and \({}^3{\hbox {He}}\) from \({}^{28}{\hbox {S}} + {}^{28}{\hbox {Si}}\) collisions. The differences in directed flows for neutrons and protons and \({}^3{\hbox {H}}\)–\({}^3{\hbox {He}}\) from a proton-rich nucleus \({}^{28}{\hbox {S}}-\) induced collisions are noticeably larger than those from a stable nucleus \({}^{32}{\hbox {S}}-\) induced reactions under medium impact parameters. Thus, the yield ratios and differences in directed flows for the neutrons and protons and \({}^3{\hbox {H}}\)–\({}^3{\hbox {He}}\) under medium impact parameters are proposed as possible observable items for studying isospin physics.

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Authors and Affiliations

  1. School of Energy and Power Engineering, Northeast Electric Power University, Jilin, 132012, China

    Ting-Zhi Yan, Shan Li, Yan-Nan Wang & Fei Xie

  2. State Grid Tancheng Power Supply Company, Linyi, 276100, China

    Ting-Feng Yan

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  1. Ting-Zhi Yan
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Correspondence to Ting-Zhi Yan.

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This work was supported by the National Natural Science Foundation of China (No. 11405025).

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Yan, TZ., Li, S., Wang, YN. et al. Yield ratios and directed flows of light particles from proton-rich nuclei-induced collisions. NUCL SCI TECH 30, 15 (2019). https://doi.org/10.1007/s41365-018-0534-6

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