Analysis of GLAST Balloon Experiment Data

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Presentation transcript:

Analysis of GLAST Balloon Experiment Data Annual meeting of the Physical Society of Japan Tsunefumi Mizuno, Hirofumi Mizushima, Akimitsu Ohto, Yasushi Fukazawa, Takashi Ohsugi (Hiroshima University), Tuneyoshi Kamae, Hiroyasu Tajima (SLAC), Masanobu Ozaki (ISAS) mizuno@hirax6.hepl.hiroshima-u.ac.jp GLAST LAT/Balloon Experiment(p.2) Instrument simulator/CR models(p.3) Data analysis(pp.4-6) Summary(p.7)

GLAST Large Area Telescope/Balloon Experiment GLAST LAT(20MeV-300GeV) Balloon Flight Engineering Model (BFEM): single tower 4X4=16tower eXternal Gamma-ray Target(XGT) Anti Coincidence Detector (ACD) Si-Strip Tracker (TKR) CsI Calorimeter (CAL) Support Structure To achieve high sensitivity aimed by GLAST, we need to estimate background in orbit accurately. During the level flight (@38km), we collected cosmic-ray events (>=100k) to be used for a background database for LAT.

Instrument simulator and Cosmic-ray models Proton energy spectrum (from zenith) A Geant4-based Monte-Carlo instrument simulator BESS (magnetic north pole) XGT AMS ACD our model (used in Geant4 Simulation) CAL TKR secondary (atmospheric) primary with geomagnetic cutoff and solar modulation @ Palestine, 2001 0.01 0.1 1 10 100 GeV Support Structure Pressure Vessel alpha electron/positron particles with underline are expected in orbit atmospheric gamma muon

Count Rate of Each Layer for “Charged Events” Count rate of each layer for “Charged Events” (hit in ACD) trigger rate (Data) ~445Hz simulation total (our prediction before the flight) ~350Hz proton : 145Hz alpha : 18Hz e- : 45Hz e+ : 30Hz gamma : 50Hz muon : 62Hz Real Data (level flight) muon gamma e-/e+ alpha proton Count rate observed and simulation prediction agree with each other in ~20% 26 Si layers (13 planes: x-y pair) CAL ACD TKR

Angular distribution of “Charged Events” (preliminary) Straightness of the reconstructed track Zenith angles of the straight/single track Data Data Simulation (total) muon muon gamma e-/e+ proton alpha alpha e-/e+ gamma proton 10-6 10-3 1 103 rms (arbitrary unit) horizontal cos (theta) downward straight track Data and simulation agree with each other in ~20%. We may need to increase the proton/alpha/muon flux to explain data.

Count Rate of Each Layer for Neutral Events Count rate of each layer (no hit in ACD) trigger rate (Data) ~55Hz simulation total (our prediction before the flight) ~52Hz proton : 3.1Hz alpha : ~0Hz e- : 6.9Hz e+ : 3.9Hz gamma : 35.5Hz muon : 2.4Hz muon thick Lead converters gamma Real Data (level flight) e-/e+ proton Overall agreement is good between data and prediction. Count rate in upper layers are smaller than data.

Summary We performed GLAST Balloon Experiment on August 4th, 2001. All detector components worked well in high-counting enviroment. We obtained ~100k Cosmic-ray events to be used as a background database for LAT. We have developed a Geant4 based instrument simulator and Cosmic-ray flux models. We have investigated the count rate, straightness of the track and angular dependence of the flux. Data and simulation prediction agree with each other in ~20%, below uncertainty of CR flux. Detailed study is underway.