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THE OBSERVATION OF HIGH ENERCY PRIMARY COSMIC-RAY BY JAPAN-RUSSIA COOPERATIVE BALLOON EXPERIMENT

日俄合作气球实验对高能初级宇宙线的观测

基本信息

批准号：
08404012
负责人：
NANJO Hirotada
金额：
$ 26.05万
依托单位：
HIROSAKI UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (A)
财政年份：
1996
资助国家：
日本
起止时间：
1996 至 1999
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08404012/
关键词：
Cosmic-ray Energy Spectrum Observation by Balloon Emulsion Chamber

项目摘要

In cosmic ray study, there has been a long standing problem, the cause of the knee -- the break of the spectrum around 10 (15)$ eV. Although this is one of the most important problem in cosmic ray study, the lack or the direct observation make it impossible to draw the concrete picture of the knee. So as to solve this problem, the observations or chemical compositions and energy spectrum measurements have been carried out by using the balloon borne emulsion chambers since 1995 as the collaboralion or Japan and Russia.The balloons were launched twice in 1995, twice in 1996, three times in 1997 and 4 times in 1999, 11 times in total. All are successful flights and recoveries except only one time 1997. The flight duration is typically about 160 hours from Kamchatuka peninsula to Volga river region.Japanese and Russian collaborators visit each other to discuss the analysis and scientific results as well as for depacking chambers and processing or photographic materials. Specially November l999, we had the workshop to study RUNJOB results, comparing those or JACEE, SOKOL and others in Hirosaki. At this workshop, the significance and reliability of the results and future problems were discussed extensively.The data up to 1996 campaigns are analyzed and the results were reported at the international cosmic ray conference in 1997 and 1999. Our results are consistent with the extrapolation from the lower energy region. As for the proton spectrum, the agreement is good among JACEE, SOKOL and ours, but our helium spectrum is lower than others by factor 2. And the paper on these results are submitted to Astro-Particle Physics February in 2000.The analysis or 1997 and 1999 data is going on now. 1997 analysis is very close to the completion and the first-stage analysis or 1999 data is finished. The final results will be published in two years.

在宇宙线研究中，有一个长期存在的问题，膝关节的原因-在10（15）$ eV附近的光谱的突破。虽然这是宇宙线研究中最重要的问题之一，但由于缺乏或无法直接观察到膝盖，因此无法绘制出膝盖的具体图像。为解决这一问题，自1995年以来，日本和俄罗斯合作，利用球载乳胶室进行了11次的观测，其中1995年2次，1996年2次，1997年3次，1999年4次。除了1997年的一次外，所有的飞行和回收都是成功的。从堪察加半岛到伏尔加河地区的飞行时间通常约为160小时。日本和俄罗斯的合作者相互访问，讨论分析和科学结果，以及拆包室和处理或摄影材料。特别是1999年11月，我们在广崎举办了RUNJOB研究成果的研讨会，对JACEE、索科尔和其他研究成果进行了比较。在这次研讨会上，广泛讨论了结果的意义和可靠性以及未来的问题，分析了截至1996年活动的数据，并在1997年和1999年的国际宇宙射线会议上报告了结果。我们的结果与从低能区外推的结果是一致的。对于质子能谱，JACEE、索科尔和我们的能谱一致性很好，但我们的氦能谱比其他人的低2倍。2000年2月，论文已提交给《天体粒子物理》杂志。目前，对1997年和1999年的观测数据的分析正在进行中。1997年的分析已经非常接近完成，第一阶段的分析或1999年的数据已经完成。最终结果将在两年内公布。