Abstract

The K-shell ionization probability P/sub K/ of the uranium-like products has been measured in the deep-inelastic reaction U+U at a beam energy of 7.5 MeV/u as a function of the total kinetic energy loss -Q. P/sub K/ was determined for Q values down to -190 MeV. After the subtraction of the ionization induced by internal conversion of ..gamma.. rays, a strongly Q-dependent P/sub K/ is found in qualitative agreement with theoretical predictions. From the data we infer a nuclear reaction time of approximately 10/sup -21/s at Q = -100 MeV.

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