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Results of TGE Study in 0.03-10 MeV Energy Range in Ground Experiments near Moscow and Aragatzстатья
- Авторы: Bogomolov V., Chilingarian A., Garipov G., Hovsepyan G., Iyudin A., Karapetyan T., Kovalenko A., Maximov I., Mntasakanyan E., Panasyuk M., Saleev K., Svertilov S.
- Сборник: Proceedings of International Symposium Thunderstorms and Elementary Particle Acceleration (TEPA-2016)
- Год издания: 2017
- Первая страница: 50
- Последняя страница: 55
- Аннотация: Ground-based experiments with scintillator gamma-spectrometers were conducted to study the spectral, temporal and spatial characteristics of TGEs as well, as to search the fast hard X-ray and gamma-ray flashes possibly appearing at the moment of lightning. The time of each gamma-quantum interaction was recorded with ~15 us accuracy together with detailed spectral data. The measurements are similar to ones reported at TEPA-2015 but some important improvement of the instruments was done for 2016 season. First, GPS module was used to synchronize the instrument time with UTC. The accuracy of such synchronization allows one to look at the gamma-ray data at the moment of lightning fixed by radio-wave detector or any other instrument. Second, the energy range of gamma-spectrometers was shifted to higher energies where the radiation of natural isotopes is absent. In this case one can see background changes connected with particles accelerated in thundercloud together with the background increases during the rain caused by Rn-222 daughters.Long-term measurements with two instruments placed in different points of Moscow region were done in 2016 season. First one based on CsI(Tl) 80x80 mm has energy range 0.03-6 MeV. The range of the second one based on CsI(Tl) 100x100 mm is 0.05-10 MeV. A dozen of thunderstorms with increase of Rn-222 radiation were detected but no significant increase of gamma-ray flux above 3.2 MeV was observed at these periods. A lot of data was obtained from the experiment with small gamma-ray spectrometer (40x40 mm NaI(Tl) at mountain altitude in Armenia at Aragatz station. The analysis of readings during the TGE periods indicates on the presence of Rn-222 radiation in low-energy range (E<1 MeV). The detector was improved during TEPA-2016. New 50x50 mm NaI(Tl) crystal was used and the energy range was prolonged up to 5 MeV. Exact timing with GPS-sensor was added and fast recording of the output signal at the moments of triggers from UV flash detector was provided. The first results of measurements with this spectrometer in autumn 2016 as well as the data of a new CsI(Tl) rectangular detector working with similar electronics will be discussed in the final part of the paper.
- Добавил в систему: Богомолов Виталий Владимирович