We introduce a novel technique for the investigation of neutron-proton interactions in a bubble chamber, based on the tagging of neutrons by their interactions, which has made possible the absolute normalization of the neutron beams in two experiments. In addition, measurements have been made on elastic scattering and inclusive cross sections which have been largely inaccessible to existing bubble chamber techniques.
ERRORS ARE STATISTICAL. AN EXTRA 5 PCT SYSTEMATIC HAS TO BE ADDED.
ERRORS CONTAIN SOME SYSTEMATIC UNCERTAINTY.
The neutron-proton elastic differential cross section has been measured with high statistics for incident momenta between 10 and 24 GeV/ c using wire spark chambers for the neutron detection. The t -range covered by previous experiments could thus be extended to 0.06–3 (GeV/ c ) 2 . In this t -interval the np cross section is found to be very similar to the corresponding pp cross section.
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The neutron-proton elastic differential cross section has been measured for incident momenta between 10 and 70 GeV/c and for values of the momentum transfer squared between 0.1 and 2.8 (GeV/c) 2 . The forward peak and the break at about ∣ t ∣ = 1 (GeV/ c ) 2 are very similar to corresponding pp data.
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