1. High School “Gymnasia 2,” 16 Dukhova Street, Sarov, Nizhny Novgorod Region 607186, Russia
2. Russian Federal Nuclear Center – All-Russia Research Institute of Experimental Physics, 37 Mira Avenue, Sarov, Nizhny Novgorod Region 607188, Russia; Sarov Physical and Technical Institute, 6 Dukhova Street, Sarov, Nizhny Novgorod Region 607186, Russia; and National Research Nuclear University “Moscow Engineering Physics Institute,” 31 Kashirskoye Highway, Moscow 115409, Russia