Affiliation: | (1) Duke University and Triangle Universities Nuclear Laboratory, 27706 Durham, NC, USA;(2) Present address: Institute of Physics, Jagellonian University, Reymonta 4, PL-30059 Cracow, Poland;(3) Institut für Theoretische Physik II, Ruhr-Universität Bochum, Universitätsstraße 150, D-W-4630 Bochum, Federal Republic of Germany |