[1] UNIV FREIBURG, D-7800 FREIBURG, FED REP GER
[2] RICE UNIV, HOUSTON, TX 77251 USA
[3] AUSTRIAN ACAD SCI, INST MITTELENERGIEPHYS, A-1090 VIENNA, AUSTRIA
[4] UNIV ILLINOIS, CHAMPAIGN, IL 61820 USA
[5] UNIV UPPSALA, S-75121 UPPSALA, SWEDEN
[6] UNIV ERLANGEN, D-8520 ERLANGEN, FED REP GER
[7] FORSCHUNGSZENTRUM JULICH, INST KERNPHYS, D-5170 JULICH 1, FED REP GER