Sub-micron alignment for nuclear emulsion plates using low energy electrons caused by radioactive isotopes
Sub-micron alignment for nuclear emulsion plates using low energy electrons caused by radioactive isotopes
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DOI：
10.1016/j.nima.2007.02.105
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发表时间：
2007-06
影响因子：
1.4
通讯作者：
S. Miyamoto;A. Ariga;T. Fukuda;M. Kazuyama;M. Komatsu;T. Nakano;K. Niwa;O. Sato;S. Takahashi
中科院分区：
文献类型：
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作者：
S. Miyamoto;A. Ariga;T. Fukuda;M. Kazuyama;M. Komatsu;T. Nakano;K. Niwa;O. Sato;S. Takahashi
三维带电粒子探测器采用核乳剂片，其亚微米级位置分辨率超过1m2，无死区和死区时间。这些探测器适用于研究短寿命粒子衰变，以及直接探测各种类型的中微子相互作用。乳化液板通常用于堆叠结构。为了进行物理分析，需要对板间进行精确对准。最精确的对准方法是用轨迹穿过乳剂版。精度约为0.2μm。然而，在低轨迹密度的实验中，由于板的畸变，对准精度下降到20μm，使分析变得更加困难。本文介绍了一种利用环境放射性同位素低能电子轨迹在乳化液板间定位的新方法。作为试验，乳剂板暴露于K40的β射线和γ射线下。通过乳化液层的轨迹由全自动乳化液读出系统检测。用这种方法，乳剂板之间的排列被证明是亚微米级的。该方法可用于多种核乳液实验。例如，OPERA实验中中微子相互作用顶点的定位就可以受益于这种新技术。
Nuclear emulsion plates are employed in three-dimensional charged particle detectors that have sub-micron position resolution over 1m2with no dead space and no dead time. These detectors are suitable for the study of short-lived particle decays, and direct detection of neutrino interactions of all flavors. Typically emulsion plates are used in a stacked structure. Precise alignment between plates is required for physics analysis. The most accurate alignment method is to use tracks passing through the emulsion plates. The accuracy is about 0.2μm. However, in an experiment with low track density alignment accuracy decreases to 20μm because of plate distortion and it becomes more difficult to perform the analysis. This paper describes a new alignment method between emulsion plates by using trajectories of low energy electrons originating from environmental radioactive isotopes. As a trial emulsion plates were exposed to β-rays and γ-rays from K40. The trajectories which passed through emulsion layers were detected by a fully automated emulsion readout system. Using this method, the alignment between emulsion plates is demonstrated to be sub-micron. This method can be applied to many nuclear emulsion experiments. For example, the location of neutrino interaction vertices in the OPERA experiment can benefit from this new technique.