Abstract
Differential ranges at five angles to the beam have been measured for 23 fragments, ranging from $^{47}\mathrm{Ca}$ to $^{143}\mathrm{Ce}$, produced in the interaction of $^{238}\mathrm{U}$ with 400 GeV protons. Energy spectra obtained from the data show evidence for the presence or two components, which can be attributed to deep spallation and to fragmentation or fission. The spectra have been compared with a thermal model, used to test the two-step model of high-energy reactions, subjected to an invariant cross section analysis, and compared with the predictions of the H\"ufner fast breakup model.
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