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THE OBSERVATION OF PRIMARY COSMIC-RAY BY JAPAN-RUSSIA COORPORATIVE BALLOON EXPERIMENT

日俄合作气球实验对初级宇宙线的观测

基本信息

批准号：
08045019
负责人：
NANJO Hirotada
金额：
$ 2.94万
依托单位：
HIROSAKI UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for international Scientific Research
财政年份：
1996
资助国家：
日本
起止时间：
1996 至 1997
项目状态：
已结题

项目摘要

This experiment has been carried out amually since I995, for the purpose of making clear so called "knee" in the cosmic-ray energy spectrum which is a rapid change in an inclination of spectrum. Long duration balloon flights from Kamchatka to Volga River were earried out twice in 1995, twice in 1996 and three times in 1997, and 8 flights in total 9 flights were succeeded in the observation of cosmic-ray. The disassembly of recovered chamber, proccessing of x-ray film and nuclear emulsion, the discussion about the policy of analysis and the comparison of analized data were performed through the mutual visit by both side. These discussions and cooperative works through mutual visit were quite effective for the progress in reaserach.Moreover, both side of Japanese and Russian group developed a new auto measuring system which consists of a microscope, precision stage and computer. This system realized the deduction of laborous work in the tracing back of the cascade shower to the vertex point in the nuclear emulsion, and give us a large capacity for the analysis of a large amount of data by the long dulation observation.We have already finished the data analysis for the observation in 1995 and obtained the energy spectra classified by chemical composition. The statistics is not enough but the results shows a good consistency with the energy spectra in low energy region. Convining the methodology as the energy and charge determination, these results were reported in 1997 international cosmic-ray conference held in Darvan, South Africa. The data processing for the 1996 and 1997 observation is under the analysis by use of the above mentioned new system, and the results are expected to be obtained in this summer.

这个实验自1995年以来一直在进行，目的是弄清楚宇宙线能谱中所谓的“拐点”，即谱线倾斜度的快速变化。堪察加半岛至伏尔加河的长时气球飞行于1995年进行了两次，1996年进行了两次，1997年进行了三次，共9次飞行中的8次成功进行了宇宙线观测。双方通过互访进行了回收舱的拆解、X射线胶片和核乳剂的处理、分析方针的讨论以及分析数据的比较。这些讨论以及通过互访进行的合作工作对于研究的进展非常有效。此外，日本和俄罗斯集团双方开发了一种由显微镜、精密平台和计算机组成的新型自动测量系统。该系统实现了级联簇射溯源到核乳状液顶点的繁重工作的推导，为长时间的周期观测提供了分析大量数据的能力。我们已经完成了1995年观测的数据分析，得到了按化学成分分类的能谱。统计数据还不够，但结果表明与低能区能谱具有良好的一致性。这些结果报告于1997年在南非达尔文举行的国际宇宙射线会议上，并采用了能量和电荷测定的方法。 1996年和1997年的观测资料正在利用上述新系统进行分析，预计今年夏天得出结果。