Study of hadron interactions in a lead-emulsion target
Study of hadron interactions in a lead-emulsion target
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铅乳剂靶中强子相互作用的研究
DOI：
10.1093/ptep/ptu119
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发表时间：
2014
期刊：
影响因子：
--
通讯作者：
H.Ishida et al
中科院分区：
文献类型：
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作者：
H.Ishida et al
用铅乳胶靶研究了2、4和10 GeV/强子束辐照下强子相互作用的拓扑和运动学特征。使用高速自动乳剂扫描系统跟踪总长度为60 m的轨迹。共重建了318个强子相互作用顶点及其次级带电粒子径迹。的相互作用长度，带电粒子多重性，发射角，和二次带电粒子的动量的测量结果进行了比较与蒙特卡罗模拟，似乎是一致的。从相互作用顶点发射的核碎片也检测到一个新开发的乳胶扫描系统与广角接受。它们的发射角分布与模拟结果吻合得很好。与至少一个碎片轨道相关联的事件的概率被发现是大于50%的束momentumGeV/，以及再现的模拟。这些实验结果验证了OPERA振荡实验中衰变候选样品中强子相互作用背景的估计。
The topological and kinematical characteristics of hadron interactions have been studied using a lead–emulsion target exposed to 2, 4, and 10 GeV/hadron beams. A total length of 60 mtracks was followed using a high-speed automated emulsion scanning system. A total of 318 hadron interaction vertices and their secondary charged particle tracks were reconstructed. The measurement results of interaction lengths, charged particle multiplicity, emission angles, and momenta of secondary charged particles are compared with a Monte Carlo simulation and appear to be consistent. Nuclear fragments emitted from interaction vertices were also detected by a newly developed emulsion scanning system with wide-angle acceptance. Their emission angle distributions are in good agreement with the simulated distributions. The probabilities of an event being associated with at least one fragment track are found to be greater than 50% for beam momentumGeV/and are well reproduced by the simulation. These experimental results validate the estimation of the background due to hadron interactions in the sample ofdecay candidates in the OPERAoscillation experiment.