We present a study of antineutrino interactions in hydrogen obtained in a 138000-picture run at the BNL 7-ft bubble chamber. The antineutrino beam had an energy distribution that peaked at -1.1 GeV. The cross section measured for charged-currect interactions is cr(i7p + p C + anything) = (0.32 + 0.08) x X [E; (GeV)] cm2. The neutral-current cross section is a ( i 7 p -C p r C r -) = 5.5::; x cm2. The ratio of strangeness-changing to non-strangeness-changing charged currents is R, = 0.06' ;:;:.An upper limit determined for charm production is u, < 3.8 X cm2 at the 90% confidence level. From the momentumtransfer distribution we measure average Q 2 for inelastic charged-current events with energy greater than 2 GeV,
The CPLEAR collaboration has constructed a detector at CERN for an extensive programme of CP-, T-and CPT-symmetry studies using K and K 0 produced by the annihilation of p's in a hydrogen gas target. The K 0 and K 0 are identi ed by their companion products of the annihilation K which are tracked with multiwire proportional chambers, drift chambers and streamer tubes. Particle identi cation is carried out with a liquid Cherenkov detector for fast separation of pions and kaons and with scintillators which a l l o w the measurement o f t i m e o f i g h t and energy loss. Photons are measured with a lead/gas sampling electromagnetic calorimeter. The required antiproton annihilation modes are selected by fast online processors using the tracking chamber and particle identi cation information. All the detectors are mounted in a 0.44 T uniform eld of an axial solenoid of diameter 2 m and length 3.6 m to form a magnetic spectrometer capable of full online reconstruction and selection of events. The design, operating parameters and performance of the sub-detectors are described.
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