Photoproduction of Positive K Mesons in Hydrogen

NOTE: Text or symbols not renderable in plain ASCII are indicated by [...]. Abstract is included in .pdf document. The method of Donoho and Walker (1) for measuring K particle photoproduction has been improved in order to provide a clearer identification of the K mesons and to allow measurements at a more forward angle, 10° in the laboratory. Charged particles produced in a liquid hydrogen target by the bremsstrahlung beam were analyzed by a magnetic spectrometer. The K+ particles were identified by a time of flight velocity measurement combined with a measurement of the correlated pulse height in three scintillation counters. A lucite Cerenkov counter was used to veto fast particles ([...],[...] and e) and various counters were positioned in the magnetic field to eliminate particles that might scatter off of the pole pieces. The results obtained are in good agreement with an isotropic angular distribution for the [...] reaction at a photon energy of 1000 MEV and in good agreement with the revised Cornell (2) data at 1010 MEV. A cross section for the reaction [...] was measured and found to be somewhat smaller than the corresponding [...] cross section, but the large statistical errors on this one [...] point make any further analysis difficult