New measurement of the elemental fragmentation cross sections of 218 MeV/nucleon 28 Si on a carbon target
New measurement of the elemental fragmentation cross sections of 218 MeV/nucleon 28 Si on a carbon target
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碳靶上 218 MeV/核子 28 Si 元素碎片截面的新测量
DOI：
10.1103/physrevc.107.024609
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发表时间：
2023
影响因子：
3.1
通讯作者：
Jun-Yao
中科院分区：
文献类型：
--
作者：
Guang-Shuai Li;Jun Su;Bao-Hua Sun;Satoru Terashima;Jian-Wei Zhao;Xiao-Dong Xu;Ji-Chao Zhang;Ge Guo;Liu-Chun He;Wei-Ping Lin;Wen-Jian Lin;Chuan-Ye Liu;Chen-Gui Lu;Bo Mei;Zhi-Yu Sun;Isao Tanihata;Meng Wang;Feng Wang;Shi-Tao Wang;Xiu-Lin Wei;Jin Wang;Jun-Yao
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宇宙线（GCR）的传播至关重要。在这项工作中，我们提出了一个新的EFCS测量218 MeV/核子在HIRFL-CSR复杂的碳上的28 Si。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进行了比较，并与以前的测量和修正的EPAX 2，EPAX 3，FRACS，ABRABLA 07，NUCFRG 2和IQMD与GEMINI（IQMD+GEMINI）模型的预测进行了比较。除IQMD+GEMINI模型外，其它模型均不能描述元素分布的奇偶错列强度，该模型在ΔZ≤5时能以优于3.5%的精度重现EFCSs。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。
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 28Si on carbon at 218 MeV/nucleon performed at the HIRFL-CSR complex. 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 modified EPAX2, EPAX3, FRACS, ABRABLA07, NUCFRG2, and IQMD coupled with GEMINI (IQMD+GEMINI) models. 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≤5. 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.