IQMD+GEMINI模型中单质子移除反应的研究——以~230 MeV/核子下碳靶上$^{29-33}\mathrm{Si}$的元素碎裂截面为基准
Single-proton removal reaction in the IQMD+GEMINI model benchmarked by elemental fragmentation cross sections of $^{29-33}\mathrm{Si}$ on carbon at $\sim$230~MeV/nucleon
AI总结：
该研究首次测量了~230 MeV/核子下$^{29-33}\mathrm{Si}$在碳靶上的元素碎裂截面，并用IQMD+GEMINI模型成功再现数据，揭示了单质子移除反应中直接敲出与蒸发机制的竞争关系及其对同位素中子数的依赖性。
摘要：
我们报告了在~230 MeV/核子能量下，$^{29-33}\mathrm{Si}$在碳靶上元素碎裂截面（EFCSs）的首次测量结果。覆盖电荷变化$ΔZ$=1-4的实验数据被同位旋相关的量子分子动力学（IQMD）模型与蒸发模型GEMINI耦合的IQMD+GEMINI模型很好地再现。我们进一步在该模型框架内探索了单质子移除反应的潜在机制。我们得出结论：直接质子敲出产生的截面对$\mathrm{Si}$弹核的质量数总体上表现出较弱的依赖性。弹核激发后诱发的质子蒸发对缺中子$\mathrm{Si}$同位素的截面有显著影响，而中子蒸发在丰中子$\mathrm{Si}$同位素的反应中起着关键作用。研究表明，单质子与单中子分离能的相对大小是影响蒸发过程的重要因素。
英文摘要：
We report on the first measurement of the elemental fragmentation cross sections (EFCSs) of $^{29-33}\mathrm{Si}$ on a carbon target at $\sim$230~MeV/nucleon. The experimental data covering charge changes of $ΔZ$ = 1-4 are reproduced well by the isospin-dependent quantum molecular dynamics (IQMD) coupled with the evaporation GEMINI (IQMD+GEMINI) model. We further explore the mechanisms underlying the single-proton removal reaction in this model framework. We conclude that the cross sections from direct proton knockout exhibit a overall weak dependence on the mass number of $\mathrm{Si}$ projectiles. The proton evaporation induced after the projectile excitation significantly affects the cross sections for neutron-deficient $\mathrm{Si}$ isotopes, while neutron evaporation plays a crucial role in the reactions of neutron-rich $\mathrm{Si}$ isotopes. It is presented that the relative magnitude of one-proton and one-neutron separation energies is an essential factor that influences evaporation processes.
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