Author:
Elshoukrofy A S,Sveshnikova L,Postnikov E,Astapov I,Bezyazeekov P,Boreyko V,Borodin A,Brueckner M,Budnev N,Chiavassa A,Dyachok A,Fedorov O,Gafarov A,Garmash A,Gorbunov N,Grebenyuk V,Gress O,Gress T,Grishin O,Grinyuk A,Horns D,Ivanova A,Kalmykov N,Kazarina Y,Kindin V,Kiryuhin S,Kirilenko P,Kokoulin R,Kompaniets K,Korosteleva E,Kozhin V,Kravchenko E,Kunnas M,Kuzmichev L,Lemeshev Y,Lenok V,Lubsandorzhiev B,Lubsandorzhiev N,Mirgazov R,Mirzoyan R,Monkhoev R,Nachtigall R,Osipova E,Pakhorukov A,Panasyuk M,Pankov L,Petrukhin A,Poleschuk V,Popescu M,Popova E,Porelli A,Prosin V,Ptuskin V,Rjabov E,Rubtsov G,Pushnin A,Sagan Y,Sabirov B,Samoliga V,Semeney Y,Silaev A,Silaev Jr A,Sidorenkov A,Skurikhin A,Slunecka V,Sokolov A,Spiering C,Tabolenko V,Tarashansky B,Tkachenko A,Tkachev L,Tluczykont M,Wischnewski R,Zagorodnikov A,Zhurov D,Zurbanov V,Yashin I,Darwish A A,Motaweh H A
Abstract
The problem of chemical composition below the knee in the cosmic-ray energy spectrum has not yet been solved due to low statistics collected from direct experiments. In the HiSCORE experiment the lateral distribution functions (LDF) of Cherenkov light of EASs with energy greater than hundreds of TeV can be measured in detail for millions of individual events. A full steepness of LDF is sensitive to the depth of shower maximum and as a result to primary particle type. In this paper, we developed a parametric method of separation between heavy and light groups of nuclei using the ’knee-like’ approximation of LDF and taking into account measurement uncertainty.