中能重离子碰撞中伴随单π⁺产生的电荷交换反应
Charge-Exchange Reactions Accompanied by a Single $π^+$ Production in Medium-Energy Heavy-Ion Collisions
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中文总结 AI 辅助
研究中能重离子碰撞中¹²C(¹²C,¹²N π⁺)¹²Be反应，用超相对论量子分子动力学模型结合相空间聚合方法，计算反应截面等，分析相关粒子四动量分布，反映产生机制，为实验设计提供指导，还可能是稀有同位素产生途径。
中文摘要 AI 辅助
重离子电荷交换（CE）反应是核碰撞同位旋动力学的灵敏探针。我们在超相对论量子分子动力学模型结合相空间聚合方法下，研究了400 - 600 A MeV下的¹²C(¹²C,¹²N π⁺)¹²Be反应。此反应是重离子碰撞中伴随单π⁺产生的重要CE通道，拓展了此前从轻子诱导到强子系统的研究。¹²N碎片通过核子和介子交换形成，π⁺产生主要由Δ共振激发和衰变主导。我们计算了反应截面，分析了¹²N和π⁺的四动量分布。特征相空间特征反映了不同产生机制，为未来实验设计提供指导，该反应还可能是稀有同位素产生的潜在途径。
英文摘要
Heavy-ion charge-exchange (CE) reactions provide a sensitive probe of isospin dynamics in nuclear collisions. We investigate the reaction $^{12}\mathrm{C}(^{12}\mathrm{C},\,^{12}\mathrm{N}\,π^{+})\,^{12}\mathrm{Be}$ at 400--600 A MeV within the ultra-relativistic quantum molecular dynamics model combined with a phase-space coalescence approach. This reaction represents a nontrivial CE channel accompanied by a single $π^+$ production in heavy-ion collisions, extending previous studies from lepton-induced to hadronic systems. The $^{12}\mathrm{N}$ fragment is formed via nucleon and meson exchange, whereas $π^+$ production is primarily governed by $Δ$ resonance excitation and decay, enabling simultaneous investigations of CE processes and $Δ$-induced pion production within the same reaction system. We calculate the reaction cross section and analyze the four-momentum distributions of $^{12}\mathrm{N}$ and $π^+$. Characteristic phase-space features reflect different production mechanisms and provide guidance for future experimental designs. Additionally, this reaction may serve as a potential pathway for rare-isotope production.
