[1] Univ Hamburg, Inst Expt Phys, Luruper Chaussee 149, D-22761 Hamburg, Germany
[2] DESY, D-15738 Zeuthen, Germany
[3] Lomonosov Moscow State Univ, Skobeltsyn Inst Nucl Phys, Moscow 119991, Russia
[4] Russian Acad Sci, Inst Nucl Res, Moscow 117312, Russia
[5] Inst Appl Phys ISU, Irkutsk, Russia
[6] Univ Adelaide, Sch Chem & Phys, Adelaide, SA 5005, Australia