Study of Extremely High Energy Cosmic Rays beyond Greisen Cut off (10^<20>eV)

超越格莱森截止线（10^<20>eV）的极高能宇宙线的研究

• 批准号: 12304012
• 负责人: HAYASHIDA Naoaki
• 金额: $ 28.86万
• 依托单位: Institute for Cosmic Ray Research, The University of Tokyo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (A)
• 财政年份: 2000
• 资助国家: 日本
• 起止时间: 2000 至 2002
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-12304012/
• 关键词: Cosmic ray; Cherenkov light; Fluorescence light; LIDAR system; 超高エネルギー宇宙線; 3K背景輻射; 宇宙線の起源; 超高エネルギー; 大気蛍光; GZK cutoff

The Akeno Giant Air Shower Array (AGASA) has been operated for 12 years, then Extremely High Energy (EHE) cosmic ray events(11events) above Greisen cut off energy of 10^<20> eV were observed. Cosmic ray protons is believed to lose their energy by the pion production through the interaction with 2.7K microwave background radiation. EHE cosmic rays observed by AGASA clearly exceed this critical energy and is really interesting in its nature. In this project, to confirm the energy determination of AGASA, we have built air fluorescence imaging detector (CRIS ―― Cosmic Ray Imaging System) at the center of the Akeno Observatory.In 2000 and 2001, we have build CRIS detector which cover 2 steradian around zenith and LIDAR system to monitor atmospheric transparency. The Lidar system has been successfully in operation since the winter of 2001, and the atmospheric monitoring at near UV region for cosmic ray measurement purpose was established. This result was already published in the journal, Nuclear Instrument and Method. In 2002, very intensive observation of 300 hrs in cherenkov mode was carried out, then we have observed more than 10,000 of high energy cosmic rays and studied the cosmic ray energy spectrum around the knee region (10^<14〜>10^<16>eV).

Akeno巨型空气淋浴阵列（AGASA）已经运行了12年，然后观察到Greisen切断10^<20> eV的能量上方的极高能量（EHE）宇宙射线事件（11Events）。据信，宇宙射线质子通过与2.7k微波背景辐射的相互作用而通过Pion产生失去能量。 Agasa观察到的EHE宇宙射线显然超出了此关键能量，并且在该项目中，为了确认Agasa的能量确定，我们在Akeno天文台的中心建立了空气荧光成像探测器（CRIS -COSMIC RAY成像系统）。在2000年和2001年，在2000年和2001年，我们已经建立了Crist Detector，它构建了Crist Detector，构建了Zenith围绕Zenith和Lidar yidar System Parter构建了Zenith和Lider yidar yricar System Parter interical I I I径，I I I构成了I I I径，I I I扎着I I I径。自2001年冬季以来，LiDAR系统已成功运行，并且在近距离紫外线地区进行了大气监测，以实现宇宙射线测量目的。该结果已经发表在《核工具和方法》杂志上。在2002年，在Cherenkov模式下对300小时进行了非常密集的观察，然后我们观察到了10,000多个高能量宇宙射线，并研究了膝盖区域周围的宇宙射线能量光谱（10^<14〜> 10^<16> EV）。

项目成果

Y.Uchihori et al.: "Cluster analysis of extremely high energy cosmic rays in the northern sky"Astro Particle Physics. 13. 151-160 (2000)

Y.Uchihori等人：“北方天空极高能宇宙射线的簇分析”天文粒子物理学。

K.Shinozaki et al.: "Upper Limit on Gamma-Ray Flux above 10^<19> eV Estimated by the Akeno Giant Air Shower Array Experiment"Astrophys J.. 571. L117-L120 (2002)

K.Shinozaki 等人：“由 Akeno Giant Air Shower Array Experiment 估计的 10^19 eV 以上的伽马射线通量上限”Astrophys J.. 571. L117-L120 (2002)

手嶋政廣: "宇宙を飛び交う超高エネルギー(デカジュール)宇宙線"天文月報 日本天文学会編. 94. 103-112 (2001)

Masahiro Teshima：“穿过太空的超高能量（十焦耳）宇宙射线”天文学月报，日本天文学会编辑 94. 103-112（2001）。

M.Teshima et al.: "Cluster Analysis of Extremely High Energy Cosmic Rays in the Northern Sky"Astropart.Phys.. 13. 151-160 (2000)

M.Teshima 等人：“北方天空极高能量宇宙射线的簇分析”Astropart.Phys.. 13. 151-160 (2000)

T.Yamamoto et al.: "Development of Atmospheric Monitoring System at Akeno Observatory for the Telescope Array Project"Nucl. Instrum. Meth.. A488. 191-208 (2002)

T.Yamamoto 等人：“为望远镜阵列项目开发明野天文台大气监测系统”