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Published: 1970

Total Pages: 22

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It is proposed to measure the neutron-proton charge-exchange cross-section in an on-line counter experiment for four-momentum transfers between .002 and 1.0 (GeV/c)2. The experiment will be performed in an intense neutron beam with a continuous momentum spectrum; data will be taken simultaneously for all momenta between 50 and 200 GeV/c. At a beam intensity of 107 neutrons/pulse, the true data-collection rate will be about .5 per pulse. Approximately 90,000 events will be obtained. The vector momenta of both outgoing particles are measured, resulting in a 3-constraint fit. The two-body topology allows a large rejection of background by the counter logic.