Study of High-energy Cosmic Gamma Rays and Cosmic Rays in Tibet.

高能宇宙伽马射线和西藏宇宙线的研究。

• 批准号: 14340070
• 负责人: YUDA Toshinori
• 金额: $ 9.34万
• 依托单位: The University of Tokyo (2003-2004)Nagoya University (2002)
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2002
• 资助国家: 日本
• 起止时间: 2002 至 2004
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-14340070/
• 关键词: Tibet; air shower array; knee energy region; emulsion chamber; burst detector; cosmic-ray acceleration; cosmic-ray anisotropy; supernova remnant; knee; 連動実験; コア検出器; 一次宇宙線; 高エネルギーガンマ線; 太陽の影; 太陽磁場; 空気シャワー; 空気シャワーアレイ; 活動的天体

We study high-energy cosmic gamma rays and cosmic rays with an air shower array (Tibet-II and Tibet-III) in Tibet as a joint research with China. The main research purpose is to study the origin and acceleration mechanism of high-energy cosmic rays by the observation of high-energy primary cosmic-ray energy spectrum and by observation/search of celestial high-energy cosmic gamma-ray point sourcesFrom 1996 to 1999, we set up 80 m^2 emulsion chambers and burst detectors at the center of Tibet-II and studied the energy spectrum of primary cosmic-ray protons in the knee energy region. We obtained the energy spectrum of protons above 10^<15> eV for the first time in the world, by analyzing the emulsion chamber data. The measured energy spectrum showed steepening of the spectral index in the power-law spectrum compared with that below 10^<14> eV, suggesting the acceleration scenario of cosmic rays in the shock wave in a supernova remnant. For this pupose, we developed an automatic analysis device of X-ray films based on a commercial image scanner which enabled us to process X-ray film data. We also did R&D studies of a burst detector array (1000 m^2) for selectively detecting heavy nuclei in the knee energy region, in cooperation with Tibet-III. Four test detectors with a plastic scintillator and optical fibers were setup and in operation in the Tibet-III.We also successfully observed the energy dependence of the apparent anisotropy in multi-TeV galactic cosmic-ray intensitiy due to the terrestrial orbital motion around the Sun for the first time in the world. We obtained a new result on the cosmic-ray anisotropy at the sidereal time frame as well.

作为与中国的联合研究，我们在西藏用空气簇射阵列(西藏-II和西藏-III)研究了高能宇宙伽马射线和宇宙射线。主要研究目的是通过观测高能初级宇宙线能谱和寻找天体高能宇宙射线点源，研究高能宇宙线的起源和加速机制。1996年至1999年，我们在西藏二号中心建立了80 m^2乳胶室和爆发探测器，研究了膝能区初级宇宙线质子的能谱。通过对乳胶室数据的分析，我们在世界上首次获得了10^&lt；15&gt；eV以上质子的能谱。测量的能谱表明，与低于10^&lt；14&gt；eV的谱相比，幂函数谱的谱指数变陡，这表明宇宙射线在超新星残留物中激波中的加速情景。为此，我们开发了一种基于商用图像扫描仪的X射线胶片自动分析装置，使我们能够对X射线胶片数据进行处理。我们还与西藏三号合作，研究了用于选择性探测膝关节能量区重核的爆发探测器阵列(1000m^2)。四台塑料闪烁体和光纤的测试探测器已在西藏三号站安装并投入使用。我们还首次成功地观测到了地球轨道绕太阳运动引起的多TeV银河系宇宙线强度视各向异性的能量依赖性。我们还得到了在恒星时间范围内宇宙线各向异性的新结果。

项目成果

M.Amenomori et al.: "Observation of multi-TeV diffuse gamma rays from the Galactic plane with the Tibet air shower array"The Astrophysical Journal. 580・2. 887-895 (2002)

M. Amenomori 等人：“利用西藏空气簇射阵列观测银河平面的多 TeV 扩散伽马射线”《天体物理学杂志》580・2（2002 年）。

Automatic analysis of the emulsion chamber using the image scanner applied to the Tibet hybrid experiment

• DOI: 10.1016/j.nima.2003.12.019
• 发表时间: 2004-05
• 期刊: Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment
• 影响因子: 1.4
• 作者: S. Ozawa;M. Shibata;Y. Katayose;I. Ohta;N. Hotta;T. Saito;X. Wang;T. Ouchi;J. Huang;H. Tsuchiya;J. Ren;S. L. Lu;N. Zhang;J. Li;Xueyao Zhang

Primary proton spectrum around the knee deduced from the emulsion-chamber data obtained at Mts. Fuji and Kanbala

• DOI: 10.1016/s0927-6505(02)00182-2
• 发表时间: 2003-03
• 期刊: Astroparticle Physics
• 影响因子: 3.5
• 作者: J. Huang;N. Hotta;K. Kasahara;I. Ohta;S. Ozawa;T. Saito;M. Shibata;X. W. Xu;T. Yuda

Large-Scale Sidereal Anisotropy of Galactic Cosmic-Ray Intensity Observed by the Tibet Air Shower Array

• DOI: 10.1086/431582
• 发表时间: 2005-05
• 期刊: The Astrophysical Journal Letters
• 作者: M. Amenomori;S. Ayabe;S. Cui;Danzengluobu;L. Ding;X. Ding;C. Feng;Z. Feng;Xiang Gao;Q. Geng;H. Guo;H. He;M. He;K. Hibino;N. Hotta;Haibing Hu;H. Hu;J. Huang;Q. Huang;H. Jia;F. Kajino;K. Kasahara;Y. Katayose;C. Kato;K. Kawata;Labaciren;G. Le;J. Li;H. Lu;S. L. Lu;X. Meng;K. Mizutani;J. Mu;K. Munakata;A. Nagai;H. Nanjo;M. Nishizawa;M. Ohnishi;I. Ohta;H. Onuma;T. Ouchi;S. Ozawa;Jie Ren;T. Saito;M. Sakata;T. Sasaki;M. Shibata;A. Shiomi;T. Shirai;H. Sugimoto;M. Takita;Y. Tan;N. Tateyama;S. Torii;H. Tsuchiya;S. Udo;T. Utsugi;B. Wang;Hong Wang;X. Wang;Y. Wang;H. Wu;L. Xue;Y. Yamamoto;C. Yan;X. Yang;S. Yasue;Z. Ye;G. Yu;A. Yuan;T. Yuda;H. Zhang;J. Zhang;N. Zhang;X. Zhang;Yizhe Zhang;Yi. Zhang;Zhaxisangzhu;X. Zhou

Galactic anisotropy of 10 TeV cosmic-ray intensity observed by the Tibet air shower array

西藏空气簇射阵列观测到的10 TeV宇宙线强度的星系各向异性

• 期刊: Proceedings of the 28^<th> International Cosmic Ray Conference, Tsukuba, 2003 7
• 作者: C.Tanihata;T.Takahashi;J.Kataoka;GM.Madejski;Michio Hashimoto;M.Amenomori et al.
• 通讯作者: M.Amenomori et al.