Institution: | a Skobeltsyn Institute of Nuclear Physics, Moscow State University, Moscow 119899, Russia b Irkutsk State Economics Academy, 11 Lenin str., Irkutsk 664015, Russia c Institute of Solar-Terrestrial Physics, P.O. Box 4026, Irkutsk 664033, Russia d Los Alamos National Laboratory, NIS-2, Mail Stop D-436, Los Alamos, New Mexico, 87545, USA |