Abstract

Momentum widths of fragments produced in the reactions of 320 MeV /sup 10/B with /sup 181/Ta have been measured. At forward angles the energy spectra of light particles (Z = 1,2) exhibit energy peaks characterized by a reduced momentum with sigma/sub 0/ = 54 MeV/c, which is well below the values near 85 MeV/c observed in the reactions of 43 MeV/u /sup 20/Ne with /sup 181/Ta and in reactions induced by relativistic heavy ions. These results suggest a rapid increase in momentum widths, or apparent temperature, in the 32 to 43 MeV/u range.

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