High-energy electron observations by PPB-BETS flight in Antarctica - AstrophysicsReport as inadecuate

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Abstract: We have observed cosmic-ray electrons from 10 GeV to 800 GeV by a longduration balloon flight using Polar Patrol Balloon PPB in Antarctica. Theobservation was carried out for 13 days at an average altitude of 35 km inJanuary 2004. The detector is an imaging calorimeter composed ofscintillating-fiber belts and plastic scintillators inserted between leadplates with 9 radiation lengths. The performance of the detector has beenconfirmed by the CERN-SPS beam test and also investigated by Monte-Carlosimulations. New telemetry system using a commercial satellite of Iridium,power supply by solar batteries, and automatic level control using CPU havesuccessfully been developed and operated during the flight. From the longduration balloon observations, we derived the energy spectrum of cosmic-rayelectrons in the energy range from 100 GeV to 800 GeV. In addition, for thefirst time we derived the electron arrival directions above 100 GeV, which isconsistent with the isotropic distribution.

Author: S.Torii, T.Yamagami, T.Tamura, K.Yoshida, H.Kitamura, K.Anraku, J.Chang, M.Ejiri, I.Iijima, A.Kadokura, K.Kasahara, Y.Katayose, T

Source: https://arxiv.org/

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