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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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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

本田 建 (山梨大学)

Knee 領域のEnergy Spectrum

slide2

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

air shower array at mt chacaltaya the hybrid experiment with as and ec
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 □

dj de dj dn est dn est 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
simulation
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
data reduction
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。
observation data n obs spectrum trig 1
Observation data Nobs spectrum trig=1

2.5x106

2.69

3.0

R<10m

Θ<30°

observation data n obs spectrum trig 2
Observation data Nobs spectrum trig=2

2.71

4.4x106

2.97

R<10m

Θ<30°

observation data n obs spectrum trig 3
Observation data Nobs spectrum trig=3

2.74

9.0x106

2.98

R<10m

Θ<30°

energy spectrum
Energy Spectrum

trig=3

trig=2

ad