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Energy spectra at 90° in the laboratory were obtained for He, Li, Be, and B fragments from a uranium target irradiated with 4.9 GeV protons and 2.1 GeV/nucleon deuterons and alpha particles. 0 Data at 25 and 155° were also obtained with the proton and alpha particle beams. In comparing the incident deuteron data with the incident proton data, · it was found that the cross sections were a factor of 1.5 higher but the shapes of the energy spectra were unchanged. However, with incident alpha particles it was found that the cross sections were a factor of 3 to 4 larger, and the energy spectra were somewhat broadened indicating that the effective Coulomb barriers are 15% lower, and the apparent temperatures 1.5 MeV higher. It is concluded that in the alpha particle irradiations the deposition energies are larger than with either incident protons or incident deuterons.

Fragments from uranium irradiated by 2.1 GeV/nucleon deuterons and alpha particles