Affiliation: | (1) Joint Institute for Nuclear Research Dubna, P. O. Box 79, Moscow, USSR;(2) Present address: Nuclear Physics Institute, Czechosl. Acad. Sci., 250 68 e, Czechoslovakia;(3) Present address: Institute of Physics E. P. R. C., Slovak Acad. Sci., 842 28 Bratislava, Czechoslovakia;(4) Present address: Institute of Atomic Energy, Habana, Cuba |