First demonstration of gamma-ray imaging using balloon-borne emulsion telescope
First demonstration of gamma-ray imaging using balloon-borne emulsion telescope
复制标题
首次演示使用气球载乳剂望远镜进行伽马射线成像
DOI：
10.1093/ptep/pty056
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发表时间：
2018
影响因子：
3.5
通讯作者：
et al.
中科院分区：
文献类型：
--
作者：
Hiroki Rokujo;et al.
我们描述了精确的伽马射线观测项目伽马射线天体成像仪与核乳胶（GRAINE），它使用球载乳胶伽马射线望远镜。乳胶望远镜在0.01-100 GeV能区实现了高角分辨率、偏振灵敏度和大口径面积的观测。我们报告了乳胶轨迹的数据分析，并通过使用2015年进行的气球实验的飞行数据（GRAINE 2015），通过乳胶望远镜首次演示了伽马射线成像。用最新的读出系统对乳胶胶片进行了三个月的总面积为41分钟的扫描，然后自动进行了γ射线事件选择。球载乳胶望远镜中积累了数百万个电子对事件。乳胶望远镜在气球观测期间探测到了来自校准源的信号（宇宙射线与铝板相互作用产生的伽马射线），具有很高的重要性，并在100-300 MeV的能量范围内创建了与源大小和预期角分辨率一致的伽马射线图像。GRAINE 2015实验中获得的飞行性能证明，在保持预期成像性能的情况下，更大面积的球载乳胶望远镜实验是可行的。
We describe the precise gamma-ray observation project Gamma-Ray Astro-Imager with Nuclear Emulsion (GRAINE), which uses balloon-borne emulsion gamma-ray telescopes. The emulsion telescope realizes observations with high angular resolution, polarization sensitivity, and large aperture area in the 0.01–100 GeV energy region. We report on the data analysis of emulsion tracks and the first demonstration of gamma-ray imaging via an emulsion telescope by using the flight data from the balloon experiment performed in 2015 (GRAINE 2015). The emulsion films were scanned by the latest read-out system for a total area of 41 min three months, and then the gamma-ray event selection was automatically processed. Millions of electron-pair events are accumulated in the balloon-borne emulsion telescope. The emulsion telescope detected signals from a calibration source (gamma rays from the interaction of cosmic rays with an aluminum plate) with a high significance during the balloon observation and created a gamma-ray image consistent with the source size and the expected angular resolution in the energy range of 100–300 MeV. The flight performance obtained in the GRAINE 2015 experiment proves that balloon-borne emulsion telescope experiments with larger area are feasible while maintaining the expected imaging performance.