定向暗物质搜寻用核乳胶的研究进展
R&D Status of Nuclear Emulsion For Directional Dark Matter Search
摘要：
在本研究中，我们正在进行核乳胶定向暗物质搜索的研究与开发。首先，在名古屋大学的乳剂生产设施中开发了具有精细卤化银晶体的更高分辨率的核乳剂，我们确认它可以检测预期的核反冲径迹。新技术要求读出亚微米磁道。我们开发了扩展技术，并可以读出信号的形状分析与光学显微镜。在150 ~ 200 nm的原始轨道长度范围内，光学显微镜的二维角分辨率为36 °。最后，我们用14.8MeV中子产生的反冲核进行了验证，并研制了以SPring-8为最终检查的X射线显微镜系统，用光学显微镜对选定的候选径迹进行了更高分辨率的检查。在150 ~ 250 nm的径迹长度范围内，角分辨率由光学显微镜的31 °提高到X射线显微镜的17 °。我们正在开发实用的系统，并计划开始与原型探测器的测试运行。
英文摘要：
In this study, we are doing R&D for directional dark matter search with nuclear emulsion. First of all, higher resolution nuclear emulsion with fine silver halide crystals was developed in the production facility of emulsion at Nagoya university, and we confirmed that it can detect the expected nuclear recoil tracks. The readout of submicron tracks was required the new technology. We developed the expansion technique, and could readout the signal by shape analysis with optical microscopy. The two dimensional angular resolution is 36 degrees at the original track length of range from 150nm to 200nm with optical microscopy. Finally we demonstrated by using recoiled nuclei induced by 14.8MeV neutron, and confirmed the technique.Moreover, we developed the X-ray microscope system with SPring-8 as final check with higher resolution of selected candidate tracks with optical microscopy. The angular resolution was improved from 31 degrees with optical microscopy to 17degrees with X-ray microscopy at the track length of range from 150nm to 250nm. We are developing the practical system and planning for start of the test running with prototype detector.
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