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チャカルタヤ山における 空気シャワー実験

チャカルタヤ山における 空気シャワー実験. 本田　建　 ( 山梨大学 ) Knee 領域の Energy Spectrum. Collaborator. K.Honda 1 ,N.Ohmori 3 ,K.Shinozaki 4 ,N.Inoue 4 ,M.Tamada 5 ,N.Kawasumi 2 ,N.Ochi, K.Hashimoto 2 ,I.Tsushima 2 ,A.Ohsawa 6 ,H.Aoki 7 ,K.Yokoi 8 ,T.Matano 9 , N.Martinic 10 ,R.Ticona 10 ,C.Aguirre 10

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チャカルタヤ山における 空気シャワー実験

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  1. チャカルタヤ山における空気シャワー実験 本田　建　(山梨大学) Knee 領域のEnergy Spectrum

  2. Collaborator K.Honda1,N.Ohmori3,K.Shinozaki4,N.Inoue4,M.Tamada5,N.Kawasumi2,N.Ochi, K.Hashimoto2,I.Tsushima2,A.Ohsawa6,H.Aoki7,K.Yokoi8,T.Matano9, N.Martinic10,R.Ticona10,C.Aguirre10 [1]Faculty of Engineering, Yamanashi University, Kofu, 400-8511, Japan[2]Faculty of Education, Yamanashi University, Kofu,400-8510, Japan[3]Faculty of Science, Kochi University, 780-8520, Japan[4]Faculty of Science, Saitama University, 388-8570, Japan[5]Faculty of Science and Technology, Kinki University, 577-8520, Japan[6]Institute for Cosmic Ray Research, University Tokyo, 277-8582, Japan[7]Faculty of Science, Souka University, 192-8577, Japan[8]College of science and Engineering, Aoyama Gakuin University, 157-8572, Japan[9]Shibakubo-cho 3-28-10,Tanashi,188-0014 Japan[10]Institute de Investigaciones Fisicas Universidad Mayor de San Andres, Bolivia

  3. Air Shower Array at Mt. Chacaltaya (The hybrid experiment with AS and EC) • 5200 m a.s.l ( 540 g/cm2) • Scintillation detector for density 0.25 m2 36●1.0 m2 9　■□ for Fast Timing 0.25 m2 8○ 1.0 m2 5 □

  4. dJ/dNest = dNest/dNobs dJ/dNobs dJ/dE = dJ/dNest× dNest/dE Energy Spectrum Nest spectrum Nobs spectrum • The resolution of size (Array design) • The effect of detector (thickness of scintillator) • Analysis method (analysis program) • Experimental Condition • Interaction Model • Chemical composition • Physics

  5. Simulation • CORSIKA＋QGSJETmodel • Primary composition (1) proton only～ above 2×104 GeV (2) iron only～ above 5×104 GeV • Include the detector response for each detector (plastic scintillator with 5cm thickness) • Simulated EAS data were re-analyzed to get the Shower Size(Ne) with our analysis method

  6. ＳｉｍｕｌａｔｉｏｎdNest/dEdNest/dNobs Nest Nobs E Nest

  7. data reduction • data analysis にSoft triggerを使用。 trigger detectorに 1 particle以上 （trig=1) trigger detectorに 2 particle以上 （trig=2) ……… • Simulation dataも同様にSoft triggerを使用してanalysisした。 Soft trigger別のdNest/dNobsを求め、それぞれについてDetection Efficiencyを求めた。 • 各ＴｒｉｇによるEnergy spectrumを求める。

  8. Observation data Nobs spectrum trig=1 2.5x106 2.69 3.0 R<10m Θ＜30°

  9. Observation data Nobs spectrum trig=2 2.71 4.4x106 2.97 R<10m Θ＜30°

  10. Observation data Nobs spectrum trig=3 2.74 9.0x106 2.98 R<10m Θ＜30°

  11. Simulation data Nest spectrum trig=2

  12. Energy Spectrum trig=3 trig=2

  13. Energy Spectrum

  14. END

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