Liquid scintillator composition optimization for use in ultra-high energy cosmic ray detector systems Dmitriy Beznosko, Ayan Batyrkhanov, Alexander Iakovlev and Khalykbek Yelshibekov EPJ Web Conf., 145 (2017) 19016 Published online: 26 June 2017 DOI: 10.1051/epjconf/201714519016