Affiliation: | a Institut Laue-Langevin, B.P. 156, 38042 Grenoble, France b School of Chemistry, Physics and Environmental Sciences, University of Sussex, Falmer, Brighton, BN1 9QH, UK c Institut für Physik, Postfach 3980, 55099 Mainz, Germany d Research Institute for Nuclear and Particle Physics, Theoretical Department, P.O.B. 49, H-1525 Budapest 114, Hungary |