Abstract
Production cross sections for target-like transfer products in reactions of40Ar with233,235,238U at the barrier were determined using radiochemical techniques. The heaviest products detected are isotopes of californium (Z=98). In addition to the quasi-elastic component of the isotopic distributions observed in the vicinity of uranium, there are also relaxed contributions throughout the entire region. The peak positions of the isotope distributions of this component for fixed atomic number, after the transfer of > 3 charges, approach closely the minimum of the potential energy surfaces (PES). The experimental results thus indicate the cold formation of the reaction products. A search for long-lived heavy actinides produced, by fusion-evaporation, via isotopes of element 110 and their subsequent decay through α-decay chains, remained unsuccessful at a cross section limit of 21 pb.
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The authors are indepted to the UNILAC staff for the excellent performance of the accelerator, to E. Schimpf, E. Jäger, H.G. Burkhard, and B. Schausten for technical assistance, and to Dr. A. Türler for communicating the44Ca+248Cm results. We thank Dr. G. Münzenberg und Dr. F. Hessberger for the possibility to perform parasitic bombardments in the beam-dump of SHIP and for communicating the beam history and intensity. This document is an account of work sponsored by the Bundesminister für Forschung und Technologie under Contract No. 06 MZ 552. The responsibility for the content of this publication rests with the authors.