In-Flight Observation of Positron Annihilation by ILDAS.
作者： P. Kochkin , D. Sarria , C. Skeie , A. P. J. van Deursen , A. I. de Boer
DOI: 10.1029/2018JD028337
关键词: Photon 、 Annihilation 、 Lightning 、 Physics 、 Electromagnetic field 、 Computational physics 、 Positron 、 Monte Carlo method 、 Gamma ray 、 Thunderstorm
摘要: We report a 511-keV photon flux enhancement that was observed inside thundercloud and is result of positron annihilation. The observation made with the In-flight Lightning Damage Assessment System (ILDAS) on board an A340 test aircraft. aircraft intentionally flying through thunderstorm at 12-km altitude over Northern Australia in January 2016. Two gamma ray detectors showed significant count rate increase synchronously fast electromagnetic field variations registered by on-board antenna. A sequence 10 enhancements detected, each lasted for about 1 s. Their spectrum mainly consists photons their Compton component. local electric activity during emission identified as series static discharges full-scale Geant4 model created to estimate area. Monte Carlo simulation indicated positrons annihilated direct vicinity or body.
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