This paper gives a detailed description of an experiment which studies the interactions of muon-type neutrinos in hydrogen and deuterium. The experiment was performed at the Zero Gradient Synchrotron using the wide-band neutrino beam incident on the Argonne 12-foot bubble chamber filled with hydrogen and deuterium. The neutrino energy spectrum peaks at 0.5 GeV and has a tail extending to 6 GeV. The shape and intensity of the flux is determined using measurements of pion yields from beryllium. The produced pions are focused by one or (for the latter part of the experiment) two magnetic horns. A total of 364000 pictures were taken with a hydrogen filling of the bubble chamber and 903000 with a deuterium filling. The scanning and other analyses of the events are described. The most abundant reaction occurs off neutrons and is quasi-elastic scattering vd +p-pp,. The separation of these events from background channels is discussed. The total and differentla] cross sections are analyzed to obtain the axial-vector form factor of the nucleon. Our result, expressed in terms of a dipole form factor, gives an axial-vector mass of 0.95 k 0 . 0 9 GeV. A comparison is made to previous measurements using neutrino beams, and also to determinations based upon threshold pion electroproduct~on experiments. In addition, the data are used to measure the weak vector form factor and so check the conserved-vector-current hypothesis.

D 2 fill, represent the first experimental study of neutrino interactions in pure hydrogen and deuterium.The full circulating beam of the ZGS was resonantly extracted with an efficiency of 65% and a spill time of ~20 //sec. On the average, 1.2We present an analysis of 153 events of the reaction vp-*\x~Tt*p at an average neutrino energy of 1 GeV. The results were obtained using the Argonne 12-ft hydrogen bubble chamber. The reaction is dominated by \x ~A ++ (1236) production for which the total cross section rises from threshold to a value of (0.74±0.18)x io" 38 cm 2 at E v &1.0 GeV. The production and decay angular distributions of the A ++ are given. There is no evidence for hadron-lepton mass enhancements. 335

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From 2728 events of 205 GeV pp interactions found in 15, 000 pictures taken with the 30-inch hydrogen bubble chamber at the National Accelerator Laboratory, a total cross section of 39-5 ± 1. 1 mb was measured. The mean charged particle multiplicity for inelastic pp collisions was measured to be 7. 65 ± 0. 17. The prong distribution from 2 to 22 prongs is broader than aPoisson distribution and has a width parameter f_ = - 2 = 0. 95 ± 0.21.Work supported by the U. S. Atomic Energy Commission.On leave from Tel-Aviv University, Tel-Aviv, Israel.Presently on leave at Argonne National Laboratory.In this letter we present data on pp interactions observed in the 30"hydrogen bubble chamber at the National Accelerator Laboratory. Although many aspects of this exposure are still being studied, we present the results on the charged prong multiplicity distributions because of the current interest in such properties of high energy interactions.The proton beam from the separated function synchrotron operating at 205 GeV was extracted and passed through a series of collimators and mag-9 netic lenses to reduce the intensity from ~ 10 to a few protons per pulse.After momentum analysis and shaping, the beam entered the 30-inch hydrogen bubble chamber. The chamber was operated at a magnetic field of 27 kG and four views were photographed on 70 mm film.The total of about 15, 000 good pictures was divided into two equal samples which were independently analyzed by two groups of the authors.The film was scanned by the authors using all four views on a projection of 90% life size. The fiducial volume in space was about 40 cm along the beam direction. In the scan, the following were recorded: (1) the number of charged prongs, (2) associated V decays and y conversions, (3) charged decays of prongs from the main vertex, (4) obvious Dalitz pairs, recognized by the spiralization or bubble density and curvature of an electron track, (5) associated neutron stars, and (6) any secondary interactions of the particles from the primary vertex. The frames used in this experiment were quite free of background tracks, and the optical quality of the track images 3 is outstanding in this chamber, so that no trouble was experienced in recognizing the events.For each acceptable frame, a beam count was made. An average of 3. 5 beam tracks entered the chamber for each acceptable picture. In general, non-beam tracks were easily recognizable since the beam in the chamber was tightly collimated.About one-quarter of the film was scanned a second time. A comparison of the results showed that for the frames that were used for this experiment, the average scanning efficiency was 99 ± i% except for the two-prong topology, where it was estimated to be 96 ± 3%. Although the second scan showed that a complete rescan of the pictures was not necessary, it also revealed some discrepancies between the two scans in counting the number of prongs associated with the events. These discrepancies were due mainly to the high multiplicity and forward collimation ...

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A bubble-chamber study of proton-proton interactions at 205 GeV yielded 66 K°'B 9 28 A's, and 2 A's produced in the backward cm. hemisphere. The cross sections for p+p -(A/2°) + anything and p +p -(K°/K!) + anything are 3.2 ± 0.6 and 12.9 ± 1.7 mb, respectively. Comparison of the invariant cross section with lower-energy data shows that (A/S°) production is consistent with approximate scaling behavior above 28 GeV, whereas the (K°/K°) invariant cross section has increased considerably between 28 and 205 GeV"We present results on A/S Q and K°/K° inclusive reactions obtained from an exploratory exposure of the 30-in. hydrogen bubble chamber to 205-GeV protons at the National Accelerator Laboratory. A total of 15 000 pictures were scanned and analyzed as described previously. 1 A second independent examination of all primary interactions yielded first and second scan efficiencies for associated V's of 0.89±0.02 and 0.94±0.02, respectively.A total of 401 V's pointing to beam-track interactions were found, of which 332 remained after fiducial region 2 cuts were made. These events were measured, up to 3 times if necessary, and the 309 events with successful geometrical reconstruction were kinematically fitted. After visual inspection of ionization densities, 36 of the events remained kinematically ambiguous, and these were mostly high-momentum Fs giving a y fit as well as a K°, A 0 , or A 0 fit. These events were classified on a statistical basis using the expected transverse momentum (P^) distributions of the decay products with respect to the neutral-particle direction. 3 Because of the loss of V's close to the production vertex, a minimum-length (L min ) cut of 2 cm for V° (K°, A, X) decays and 4 cm for y's was applied and, additionally, a minimum kinematic x 2 probability 574

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