| Popis: |
A method is developed for clearly distinguishing experimentally between (p,2p) reactions which result from (p,p') reactions followed by proton boiloff, and those in which the two protons are both emitted within approx.10/sup -22/ sec in a direct reaction (referred to as ''double direct''). Measurements involving coincidence detection and energy measurements on the two protons emitted at equal angles on opposite sides of the beam (theta/sub 2/ = theta/sub 1/, phi/sub 2/ = phi/sub 1/ + ..pi..) indicate that at 17 MeV bombarding energy in the A = 50--65 region, the boiloff process is predominant with cross sections of the order of 1 mb for exciting ground states or low-lying excited states. The cross section for the double-direct process is not more than about 10 ..mu..b. A crude theoretical estimate indicates that this is about the correct order of magnitude. (AIP) |
