Abstract
Experimental and theoretical data on the production of the neutron-deficient isotopes 244Fm and 246Fm in the bombardment of lead and bismuth isotopes with 40Ar and 37C1 ions are presented. By using different lead isotopes, the cross sections for the ( 40Ar, xn) reactions with x = 1, 2, 3 and 4 have been measured. It is shown that when a target of the “magic” 208Pb nucleus or its neighbours is bombarded with ions of mass $ ̆ = 40 , the compound nuclei formed appear to be weakly excited and to de-excite by emitting only 2 or 3 neutrons. New possibilities of synthesizing elements with atomic number Z > 100 are being discussed in the framework of the experimental data obtained.
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