[en] We apply a new method to determine the probability of the uu diquark from nu p interactions fragmenting as independent quarks. In particular, by assuming that all ß's which do not come from Y*⁺, N*⁺ or charmed baryons must come from independent fragmentation, we show this probability to be about 50%. We also provide information from nu n interactions on the fragmentation of ud diquarks into ß's, and from this determine the probability of capturing a strange quark from the sea in the target region to be tau_s = 0.051 +- 0.013, about half the value found in the current region, ß_s = 0.12 +- 0.02. Overall ß production rates in nu n and nu p reactions are (7.0 +- 0.8)% and (7.0 +- 1.2)% respectively, when cuts of W > 4 GeV and x_B > 0.2 are made on the data

[en] For neutrino energies near the nucleon mass, the shape of the E/sub nu/ flux spectrum from the wide-band beam at the AGS resembles the shape of flux spectrum from atmospheric neutrinos. An opportunity is thus presented to measure the extent to which neutrino events can mimic decaying nucleons in a proton decay search, provided that a detector representative of the underground experiment can be operated in the Brookhaven beam. This crucial calibration measurement is feasible for the Soudan II experiment, wherein a 1.1 kiloton detector is assembled out of standardized five-ton tracking calorimeter modules. Each module provides fine-grained dE/dx/ sampling with independent signal readout. Details concerning neutrino exposures using a cluster of these modules is presented

No abstract available

[en] From hadronic systems induced in 3571 charged-current neutrino-deuterium interactions in the FNAL 15-foot diameter bubble chamber, invariant mass distributions (π⁺π^-) and (K/sub s/⁰π^+-) have been used to study inclusive production of vector meson resonances. Inclusive rates from a pure isoscalar target are determined to be 0.05 +- 0.01 K*⁺(890) per charged-current event and 0.19 +- 0.04 rho⁰ per charged-current event. Inclusive K*(890)^+- production is found to be predominantly K*⁺(890) in the current fragmentation region. The ratios (rho⁰/event) from neutron targets and from proton targets separately are, respectively, 0.18 +- 0.06 and 0.21 +- 0.08. For deuteron targets, trends in the dependence of (rho⁰/event) on variables Y/sub R/, W, p/sub T/, and Q² are found to be similar to those observed in rho⁰ production from anti ν/sub μ/p collisions

[en] During May 18-20 of this year the hydrogen-filled 15-foot bubble chamber at Fermilab was operated with an array of four half-inch thick stainless steel plates mounted in downstream portions of the fiducial volume. Notes from the test run, and results from a Monte Carlo study of efficiencies of the plate array for detection of photons and positrons in final states produced in a wide-band neutrino--deuterium exposure, are presented

[en] We apply a new method to determine the probability of the uu diquark from νp interactions fragmenting as independent quarks. In particular, by assuming that all Λ's which do not come from Y^asterisk+, by assuming that all Λ's which do not come from Y^asterisk+, N^asterisk+, or charmed baryons must come from independent fragmentation, we show this probability to be about 50%. We also provide information from Λ's, and from this determine the probability of capturing a strange quark from the sea in the target region to be tau_s = 0.051 +- 0.013, about half the value found in the current region, γ_s = 0.12 +- 0.02. Overall Λ production rates in νn and νp reactions are (7.0 +- 0.8)% and (7.0 +- 1.2)%, respectively. When cuts of W>4 GeV and x_B>0.2 are made on the data

[en] The use of a detection system involving an assembly of four stainless steel plates for neutrino-deuterium exposures in the FNAL 15-foot bubble chamber is discussed. With the initial design, track and chamber fiducials were not in focus from all cameras. Modifications to the plates to overcome these difficulties are under consideration and to gauge the utility of the downstream array it is necessary to have reliable estimates of its γ and e^+-detection capabilities. A study of a trimmed downstream plate array, as currently envisaged at Fermilab, using the Monte Carlo technique is reported. To obtain the necessary data the following reactions have been simulated: (1) Photons from νsub(μ) + D₂ reactions exclusive channels. (2) Photons, e⁺s from νsub(μ) + D₂ reactions, inclusive channels. (3) Showering in plates, photon conversion in deuterium. (U.K.)

[en] The inclusive process π⁺+P→K /sup asterisk0/(890)+X is studied at 16 GeV/c using a 2-m streamer chamber containing a central liquid hydrogen target. From photographs triggered by detection of a forward K^- meson, the signal K-bar /sup asterisk0/→K^-π⁺ is extracted. The inclusive rate for K-bar ( production into the forward hemisphere sigma(x/sub F/>0.3) is 115 +- 27 μb; the p/sub T/ ² distribution is found to have a slope constant of 3.3 +- 0.6 (GeV/c)². The Feynman-x distribution for K-bar /sup asterisk0/ is consistent with a Kuti-Weisskopf model in which the valence and sea quarks of the incident pion interact with only the sea quarks of the target proton

[en] The authors use ν/sub μ/-deuteron reactions into exclusive multipion final states to determine the extent to which atmospheric ν interactions can imitate nucleon decay. For decays N → iota/sup C/π/sup C/π/sup C/ (iota/sup C/π/sup C/π/sup C/π⁰), neutrinos induce background events at the rate 0.07 +- 0.06 (0.03 +- 0.02) per kiloton year. By requiring a multipion final state to be consistent with a rho, ω, or eta, a five-fold reduction of the background is obtained. Thus present-generation experiments are capable of searching for such decays at a lifetime level of many kiloton years corresponding to many kiloton years of detector exposure. Events containing a visible strange particle are also under analysis

[en] We use ν/sub μ/-deuteron reactions into exclusive multipion final states to determine the extent to which atmospheric ν interactions can imitate nucleon decay. For decays N→l/sup c/π/sup c/π/sup c/ (l/sup c/π/sup c/π/sup c/π⁰), neutrinos induce background events at the rate 0.07 +- 0.06 (0.03 +- 0.02) per kiloton year. By requiring a multipion final state to be consistent with a rho, ω, or eta, a fivefold reduction of the background is obtained. Thus present-generation experiments are capable of searching for such decays at a lifetime level corresponding to many kiloton years of detector exposure