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A search has been made for spontaneous fission activity in four different chemical fractions following irradiations of thick 2 3 *U targets with 1150 MeV 1 3 6 Xe beams. The chemically separated fractions were a sulfide precipitate, a complexed metal bromide fraction, a volatile metal bromide fraction, and a noble gas fraction. No evidence was found for superheavy elements, which would correspond to the transfer of ~ 5 0 nucléons. In addition an analogous experiment has been done to look for alpha particle activity f rom elements near doubly magic 2 0 8 Pb produced in the l 3 6 X e + 0 3 1 Gd reaction also corresponding to the transfer of ~ 50 nucléons. Based on an upper limit cross section for 2 1 2 Pb the usefulness of the 1 3 4 Xe + 2 3 8 U reaction as a test for the existence of the island of stability is discussed.

Search of Superheavy Elements Produced in the 136 Xe + 238 U Reaction and an Upper Limit Cross Section for the nat Gd( 136 Xe, X) 212 Pb Reaction