The accuracy of reaction theories used to extract properties of exotic nuclei from scattering experiments is often unknown or not quantified, but of utmost importance when, e.g., constraining the equation of state of asymmetric nuclear matter from observables as the neutron-skin thickness. In order to test the Glauber multiple-scattering model, the total interaction cross section of ▪ on carbon targets was measured at initial beam energies of 400, 550, 650, 800, and 1000 MeV/nucleon. The measurements were performed during the first experiment of the newly constructed RB (Reaction with Relativistic Radioactive Beams) experiment after the start of FAIR Phase-0 at the GSI/FAIR facility with beam energies of 400, 550, 650, 800, and 1000 MeV/nucleon. The combination of the large-acceptance dipole magnet GLAD and a newly designed and highly efficient Time-of-Flight detector enabled a precise transmission measurement with several target thicknesses for each initial beam energy with an experimental uncertainty of . A comparison with the Glauber model revealed a discrepancy of around 3.1% at higher beam energies, which will serve as a crucial baseline for the model-dependent uncertainty in future fragmentation experiments.

中文翻译：

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测量核相互作用截面以测定中子表层厚度


用于从散射实验中提取奇异核特性的反应理论的准确性通常是未知的或未量化的，但在例如将可观测量中的不对称核物质的状态方程限制为中子皮厚度时至关重要。为了测试格劳伯多重散射模型，在初始束流能量为 400、550、650、800 和 1000 MeV/核子时测量了 ▪ 在碳靶上的总相互作用截面。这些测量是在 GSI/FAIR 设施的 FAIR Phase-0 启动后新建的 RB（相对论放射性束反应）实验的第一次实验期间进行的，束流能量为 400、550、650、800 和 1000 MeV /核子。大接受度偶极磁体 GLAD 与新设计的高效飞行时间探测器相结合，能够对每个初始光束能量的多个目标厚度进行精确的传输测量，实验不确定度为 。与 Glauber 模型的比较显示，在较高光束能量下，差异约为 3.1%，这将作为未来碎裂实验中模型相关不确定性的重要基线。