1. 本田 建 (山梨大学) Knee 領域のEnergy Spectrum
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, , Japan [2]Faculty of Education, Yamanashi University, Kofu, , Japan [3]Faculty of Science, Kochi University, , Japan [4]Faculty of Science, Saitama University, , Japan [5]Faculty of Science and Technology, Kinki University, , Japan [6]Institute for Cosmic Ray Research, University Tokyo, , Japan [7]Faculty of Science, Souka University, , Japan [8]College of science and Engineering, Aoyama Gakuin University, , Japan [9]Shibakubo-cho ,Tanashi, 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 m 　　●　　 m 　■□
for Fast Timing
0.25 m 　 ○
1.0 m □

5. dJ/dE = dJ/dNest × dNest/dE
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

6. Simulation CORSIKA＋QGSJET model 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

7. Ｓｉｍｕｌａｔｉｏｎ dNest/dE dNest/dNobs

8. 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。

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

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

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

12. Simulation data Nest spectrum trig=2

13. Energy Spectrum
trig=3
trig=2

14. Energy Spectrum

15. END