Abstract
Within an extended semiquantal theory we perform large-sized coupled-channel calculations involving 260 collective levels for Coulomb fission of /sup 238/U. Differential Coulomb fission cross sections are studied as a function of bombarding energy and impact parameter for several projectiles. In the Xe + U case, total cross sections are also given. We find a strong dependence on projectile charge number, P/sup CF/(180/sup 0/) approx. (Z/sub p/)/sup 6/ in the region 50 < or = Z/sub p/ < or = 92 for a fixed ratio E/E/sub Coul/, which might be helpful to separate Coulomb fission experimentally from sequential fission following transfer reactions. Since the cross sections are sensitive to the moment of inertia THETA at the saddle point, Coulomb fission can serve as a tool to investigate the dependence of THETA on elongation. The fragment angular distribution exhibits deviations from 1/sintheta/sub f/ which are pronounced at low incident energies. Our theory indicates that the recently measured Xe + U fission cross sections contain a major fraction of Coulomb-induced fission at E < or = 0.85 E/sub Coul/.
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