Exclusive photoproduction cross sections have been measured for the processes y p + r + n , y p -r a p , y p i r r -~+ + , y p i p o P , y p -' K + A , and y p i K + z O at large t and u values at several energies for each process between 4 and 7.5 GeV. These measurements taken together with past data taken at small values of t and u provide complete angular distributions. The data show the usual small t and u peaks and a central region in which the cross section decreases approximately as s -'. The results are discussed within the context of parton or constituent models.
J/ip photoproduction has been measured from beryllium and tantalum targets by observing the yield of single muons at a transverse momentum of 1.65 GeV/c with a bremsstrahlung beam of £ 0 = 20 GeV. The results have been interpreted in terms of a nuclearoptics model to yield the ^-nucleon total cross section. The result is oty A = 3.5± 0.8 mb.A search for ixe events produced in an antineutrino hydrogen-neon experiment using the Fermilab 15-ft bubble chamber is reported. Based on a single candidate, the 90%-confidence upper limit for the relative yield of ii+e~ events is 0.5% of all charged-current events with antineutrino energy greater than 10 GeV.
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