ARGO-YBJ实验的中心区域(5000M2)已于2006年6月底完成安装调试并投入试运行。相应的环境监测系统Detector Control System(DCS)也开始工作,持续不断地记录下实验厅内外的温度、厅内的气压、RPC漏电流等参数。通过对这些参数数据的分析,...ARGO-YBJ实验的中心区域(5000M2)已于2006年6月底完成安装调试并投入试运行。相应的环境监测系统Detector Control System(DCS)也开始工作,持续不断地记录下实验厅内外的温度、厅内的气压、RPC漏电流等参数。通过对这些参数数据的分析,可以清楚地了解探测器的工作状况,以维持整个阵列长期稳定运行,同时为理解实验数据和物理分析工作提供参考。展开更多
The energy spectrum of cosmic Hydrogen and Helium nuclei has been measured below the so-called ＂knee＂ by using a hybrid experiment with a wide field-of-view Cherenkov telescope and the Resistive Plate Chamber （RPC...The energy spectrum of cosmic Hydrogen and Helium nuclei has been measured below the so-called ＂knee＂ by using a hybrid experiment with a wide field-of-view Cherenkov telescope and the Resistive Plate Chamber （RPC） array of the ARGO-YBJ experiment at 4300 m above sea level. The Hydrogen and Helium nuclei have been well separated from other cosmic ray components by using a multi-parameter technique. A highly uniform energy resolution of about 25% is achieved throughout the whole energy range （100-700 TeV）. The observed energy spectrum is compatible with a single power law with index γ=-2.63±0.06.展开更多
In order to observe gamma rays in the 100 TeV energy region, the 4500 m2 underground muon detector array using water Cherenkov technique is constructed, forming the TIBET Ⅲ＋MD hybrid array. Because the showers induc...In order to observe gamma rays in the 100 TeV energy region, the 4500 m2 underground muon detector array using water Cherenkov technique is constructed, forming the TIBET Ⅲ＋MD hybrid array. Because the showers induced by primary gamma rays contain much fewer muons than those induced by primary hadrons, significant improvement of the gamma ray sensitivity for TIBET Ⅲ＋MD array is expected. In this paper, the design and performance of the MD-A detector with large Tyvek bag is reported.展开更多
We study the sidereal and solar time modulation of multi-TeV cosmic rays using the east-west method with Tibet air shower array data taken from November 1999 to December 2008. The statistics are twice the amount used ...We study the sidereal and solar time modulation of multi-TeV cosmic rays using the east-west method with Tibet air shower array data taken from November 1999 to December 2008. The statistics are twice the amount used in our previous paper. In this analysis, the amplitude of the observed sidereal time modulation is about 0.1%, and the modulation shows an excess from about 4 to 7 hours and a deficit around 12 hours in local sidereal time. The sidereal time modulation has a weak dependence on the primary energy of the cosmic rays. However, the solar time modulation shows a large energy dependence. We find that the solar time modulation is fairly consistent with the prediction of the Compton-Getting effect for high-energy samples （6.2TeV and 12.0TeV）, but exceeds the prediction for the low-energy sample （4.0TeV）. Such a discrepancy may be due to the solar modulation or the characteristics of the experimental device in the near threshold energy.展开更多
文摘ARGO-YBJ实验的中心区域(5000M2)已于2006年6月底完成安装调试并投入试运行。相应的环境监测系统Detector Control System(DCS)也开始工作,持续不断地记录下实验厅内外的温度、厅内的气压、RPC漏电流等参数。通过对这些参数数据的分析,可以清楚地了解探测器的工作状况,以维持整个阵列长期稳定运行,同时为理解实验数据和物理分析工作提供参考。
基金Supported by NSFC(10975145,11075170)Knowledge Innovation Fund(H85451D0U2)of IHEP+2 种基金Chinese Ministry of Science and Technology,Chinese Academy of Science,Key Laboratory of Particle Astrophysics,CASin Italy by the Istituto Nazionale di Fisica Nucleare(INFN)Ministero dell’Istruzione,dell’Università e della Ricerca(MIUR)
文摘The energy spectrum of cosmic Hydrogen and Helium nuclei has been measured below the so-called ＂knee＂ by using a hybrid experiment with a wide field-of-view Cherenkov telescope and the Resistive Plate Chamber （RPC） array of the ARGO-YBJ experiment at 4300 m above sea level. The Hydrogen and Helium nuclei have been well separated from other cosmic ray components by using a multi-parameter technique. A highly uniform energy resolution of about 25% is achieved throughout the whole energy range （100-700 TeV）. The observed energy spectrum is compatible with a single power law with index γ=-2.63±0.06.
基金Supported by Ministry of Science and Technology of China, National Natural Science Foundation of China (10725524, 11135010,10875132, 11105156)Chinese Academy of Sciences (KJCX2-YW-N13, GJHZ1004, 2A20093111116010)Knowledge Innovation Fund(H85451D1U2) of IHEP, China
文摘In order to observe gamma rays in the 100 TeV energy region, the 4500 m2 underground muon detector array using water Cherenkov technique is constructed, forming the TIBET Ⅲ＋MD hybrid array. Because the showers induced by primary gamma rays contain much fewer muons than those induced by primary hadrons, significant improvement of the gamma ray sensitivity for TIBET Ⅲ＋MD array is expected. In this paper, the design and performance of the MD-A detector with large Tyvek bag is reported.
基金Supported by Natural Science Foundation of Shandong Province of China (ZR2009AM003)National Natural Science Foundation of China+1 种基金Chinese Academy of Sciences and Ministry of Education of ChinaInnovation Foundation of Shandong Agriculture University(23665)
文摘We study the sidereal and solar time modulation of multi-TeV cosmic rays using the east-west method with Tibet air shower array data taken from November 1999 to December 2008. The statistics are twice the amount used in our previous paper. In this analysis, the amplitude of the observed sidereal time modulation is about 0.1%, and the modulation shows an excess from about 4 to 7 hours and a deficit around 12 hours in local sidereal time. The sidereal time modulation has a weak dependence on the primary energy of the cosmic rays. However, the solar time modulation shows a large energy dependence. We find that the solar time modulation is fairly consistent with the prediction of the Compton-Getting effect for high-energy samples （6.2TeV and 12.0TeV）, but exceeds the prediction for the low-energy sample （4.0TeV）. Such a discrepancy may be due to the solar modulation or the characteristics of the experimental device in the near threshold energy.
