218 MeV/nucleon 28 Si在碳靶上元素碎裂截面的新测量
New measurement of the elemental fragmentation cross sections of 218 MeV/nucleon 28 Si on a carbon target
摘要：
本文研究了在宽能量范围内，不同弹靶组合下稳定和不稳定核素的元素碎裂截面。这些数据对于约束和发展理论反应模型以及研究银河系宇宙射线（GCR）的传播是至关重要的。本文介绍了在兰州重离子研究装置（HIRFL-CSR）上进行的碳上$^{28}$ Si的218 MeV/核子EFCS测量。目标厚度的影响已被很好地校正，以获得准确的EFCS。我们目前的结果与电荷变化$ΔZ$ = 1-6相比，以前的测量和预测的模型修改EPAX 2，EPAX 3，FRACS，ABRABLA 07，NUCFRG 2，和IQMD与GEMINI（IQMD+GEMINI）。除IQMD+GEMINI模型对$ΔZ\leq5$的拟合精度优于3.5%外，其它模型均不能描述元素分布的奇偶交错强度。IQMD+GEMINI分析表明，EFCs的奇偶交错发生在连续的统计衰减阶段，而不是在初始的动力学碰撞阶段。这提供了一个合理的方法来理解断裂反应的潜在机制。
英文摘要：
Elemental fragmentation cross sections (EFCSs) of stable and unstable nuclides have been investigated with various projectile-target combinations at a wide range of incident energies. These data are critical to constrain and develop the theoretical reaction models and to study the propagation of galactic cosmic rays (GCR). In this work, we present a new EFCS measurement for $^{28}$Si on carbon at 218~MeV/nucleon performed at the Heavy Ion Research Facility (HIRFL-CSR) complex in Lanzhou. The impact of the target thickness has been well corrected to derive an accurate EFCS. Our present results with charge changes $ΔZ$ = 1-6 are compared to the previous measurements and to the predictions from the models modified EPAX2, EPAX3, FRACS, ABRABLA07, NUCFRG2, and IQMD coupled with GEMINI (IQMD+GEMINI). All the models fail to describe the odd-even staggering strength in the elemental distribution, with the exception of the IQMD+GEMINI model, which can reproduce the EFCSs with an accuracy of better than 3.5\% for $ΔZ\leq5$. The IQMD+GEMINI analysis shows that the odd-even staggering in EFCSs occurs in the sequential statistical decay stage rather than in the initial dynamical collision stage. This offers a reasonable approach to understand the underlying mechanism of fragmentation reactions.
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