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.

166 events of the reaction y+»-71" +p at an average neutrino energy of ~0.7 GeV have been observed in the Argonne National Laboratory 12-ft deuterium bubble chamber. The results are well described by the conventional current-current weak-interaction theory with three real form factors Fy 1 , F v 2 , and F A . Using electron-nucleon scattering results to fix the vector mass M v at 0.84 GeV, and assuming a dipole form for F A , we obtain the value 0.95 ±0.12 GeV for the axial-vector mass M A .

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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In exposures of the Argonne National Laboratory 12-ft bubble chamber filled with hydrogen and deuterium to a neutrino beam, we have observed events consisting of (1) a single 7r + meson originating in the liquid, and (2) a proton with an e*e~ pair pointing to it. Only a small fraction of these events can be ascribed to known reactions such as np-+nnir* and np-*npir°. The remaining events, which correspond to a signal of about 4.5 standard deviations, we ascribe to the reactions vp-^vnii* and vpir 0 .

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