Abstract
The energy spectra of intermediate-mass fragments (4 Zf10) emitted at angles of 50°, 90°, and 120° have been measured in inclusive reactions induced on gold by 1.5-4.5 GeV electrons. An analysis of the angular and Z dependences of these energy spectra gives evidence that, for a given bombarding energy, the measured fragments are isotropically emitted from some moving source which is substantially smaller (50-60 nucleons) than the target nucleus. The obtained values for the source velocity increase from 0.009 to 0.013 v/c in 1.5-3 GeV incident energy range. The total fragment production cross sections for each element have been estimated. The cross sections exhibit an increase with bombarding energy and a decrease with the fragment charge. Power law approximations of the obtained charge distributions for fragments with Zf5 yield exponent values of about four with no marked dependance on the incident energy.
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