[1] IST NAZL FIS NUCL, SEZ SANITA, I-00161 ROME, ITALY
[2] COMENIUS UNIV BRATISLAVA, SLQ-84215 BRATISLAVA, SLOVAKIA
[3] UNIV LJUBLJANA, JOZEF STEFAN INST, LJUBLJANA, SLOVENIA
[4] CHARLES UNIV, NUCL CTR MFF, PRAGUE, CZECH REPUBLIC
[5] AUSTRIAN ACAD SCI, INST HOCHENERGIEPHYS, VIENNA, AUSTRIA