We present results from the Fermilab 15-ft bubble chamber on the charged-partiele multiplicity distributions produced in high-energy charged-current neutrino-proton interactions. Comparisons are made to yp, ep, up, and inclusive/)/) scattering. The mean hadronic multiplicity (n c ) appears to depend only on the mass of the excited hadronic state, independent of the mode of excitation. A fit to the neutrino data gives (n c ) = (1.09 ± 0.38) + (1.09 ± 0.03) InW 2 .

Superfenic technology was first applied to Magnetic Resonance Imaging (MRI magnets by the Texas Accelerator Center cm magnet. In a evolutionary step, this technology is now being applied to the development of a whole body 4 Tesla / 1 meter magnet. The design of such a magnet is presented.

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In an exposure of the Fermilab 15-foot neon-hydrogen bubble chamber to a quadrupole triplet neutrino beam, 49 p -e i and 14 p + e events with e * momenta greater than 0.3 GeV/c have been observed, yielding p e rates per charged-current event of (0.73+0.11)% and (1.1 *0.3)%, respectively. The p -e + rate shows no strong energy dependence in the range from 30 to 300 GeV. The 18 neutral strange particles observed in the 63 events contain 14 K:, 2 A, and 2A/K,O ambiguities, suggesting that the events are predominantly D-meson production and decay and that the A: + h e x branching ratio is very small. The corrected numbers of neutral strange particles per p e and p ' e event are 1.2=t0.3 and 0.6?:!, respectively. Properties of the events, including strange-particle production, are compared t o p $p * events in the same experiment and to a charm production and decay model, and good agreement is found, apart from a possible enhancement at -5-6 GeV/c2 in the mass of the system recoiling against the p in p ' e ( a n d p i p ) events. As reported previously, four events show short-lived-particle decays, and D-meson lifetime estimates are reevaluated using the final event sample. One p ' e and three p e events were observed. The p eevents are consistent with background and lead to a p e / p e i ratio of less than 0.07 (90% confidence level) for e' momenta above 0.8 GeV/c. Five candidates for dilepton production by electron neutrinos and antineutrinos in the beam are consistent with approximately 1% rates. No good three-lepton candidates were found, and one, previously reported, four-lepton candidate was found.