TeV to PeV neutrinos and gamma-rays with Mountain SHALON Mirror Cherenkov Telescope

Physics – Nuclear Physics

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Scientific paper

Problems in observation of extensive air showers generated by neutrinos are connected with an extremely small cross-section of inelastic collisions of neutrinos with nuclei. However, two facts allow to search for showers generated by neutrinos: (1) a hadron cascade with a primary energy of more than 1013 eV leaves a mountain ridge to the atmosphere from a depth ˜ 300 g/cm2 without any essential loss of the total energy in the hadron cascade, and (2) air Cherenkov radiation from such hadron cascades will be observed with a 7.5 km distant telescope over an area of more than 7×10m. This partially compensates for the small cross-section of inelastic neutrino collisions. Observations have been carried out since 1992 at the high mountain Tien-Shan station using the SHALON Cherenkov mirror telescope with ˜11.2 m2 mirror area and image matrix of 144 PMT with full angle >8°. The telescope characteristics allowed to start searching for local neutrino sources with energy 1013 1016 eV on EAS generated in the mountain-range located at some 7.5 and more kilometers from the gamma-telescope (in Russian the abbreviation SHALON means - the Extensive Air Showers from Neutrino).

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