Abstract
Integral fission cross sections in the system238U+238U were measured at beam energies below the interaction barrierV C. Scattering angle dependent probabilities and integral cross sections for Coulomb fission were calculated. It is concluded that earlier observed discrepancies between measured and calculated angular distributions for the one-neutron transfer product239U cannot be explained by sequential fission. Multi-nucleon transfer induced fission is observed down to energies (0.90±0.02)×VC.
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On leave from Institute of Modern Physics, Academia Sinica, Lanzhou, P.R. China
This work forms part of a doctoral thesis, Universität Mainz (to be submitted)
The authors thank the UNILAC staff for delivering beams of high quality, as well as H. Folger and his coworkers for target preparation. We are indebted to E. Jäger and E. Schimpf for technical assistance. This work has been supported by the German Federal Minister for Research and Technology (BMFT) under the contract number O6MZ552. One of us (V.E.O.) acknowledges support from a grant by the U.S. Department of Energy under Contract No. DE-FG05-87ER40376 and from the Research Support Program of International Business Machines Corporation.