Abstract:
The Horizon-T (HT) detector system and the currently under R&D HT-KZ detector system are designed for
the detection of Extensive Air Showers (EAS) with energies above _1016 eV (_1017 eV for HT-KZ). The main
challenges in both detector systems are the fast time resolutions needed for studying the temporary structure
of EAS, and the extremely wide dynamic range needed to study the spatial distribution of charged particles in
EAS disks. In order to detect the low-density of charged particles far from the EAS axis, a large-area detector
is needed. Liquid scintillator with low cost would be a possible solution for such a detector, including the
recently developed safe and low-cost water-based liquid scintillators. Liquid organic scintillators give a fast
and high light yield (LY) for charged particle detection. It is similar to plastic scintillator in properties but is
cost effective for large volumes. With liquid scintillator, one can create detection volumes that are symmetric
and yet retain high LY detection. Different wavelength shifters affect the scintillation light by changing the
output spectrum into the best detection region. Results of the latest studies of the components optimization in
the liquid scintillator formulae are presented