[en] Tests with streamer tubes of small cross section (Frascati type) were performed using gas mixtures of isobutane, CO₂, and small amounts of either Ne or Ar. The flammabilities of the various mixtures were experimentally determined. The operating characteristics of the streamer tubes with such mixtures were studied. It was found that the nonflammable mixture whose isobutane:Ne:CO₂ ratio is 10:2:88 gave an efficiency plateau of about 400 V with a midpoint at 4.9 kV. (orig.)

No abstract available

No abstract available

[en] In a search for charmed particles the reactions π^-+p→p/sub r/+μ+X and p+p→p/sub r/+μ+X have been studied at beam energies of 200 and 240 GeV, respectively. Measurements of the beam particle and the slow recoil proton, p/sub r/, were used to reconstruct the mass (M) of the μ+X system. Model-dependent upper limits, sensitive to threshold behavior, are presented for the forward production cross section times the muon branching ratio for high-mass states (6< M²<54 GeV²)

[en] The production of psi (3.1) mesons is reported for the reactions π^-+Fe→μ⁺+μ^-+anything, at 200 GeV, and p+Fe→μ⁺+μ^-+anything, at 240 GeV. For psi production, distributions in xequivalentP/subL//P) and P/sub perpendicular/ are given. For xgreater than or equal to0.5, the ratio of the psi production cross sections in iron for pions to that for protons is found to be 7.4plus-or-minus2.0

[en] The reaction p + Fe → μ⁺ + μ^- + anything has been measursed at an incident momentum of 400 GeV/c. An enhancement of the order of 80 events is observed with M/sub mumu/ = 9.5 GeV at approximately the 4-standard-deviation level

[en] A missing-mass search has been made for negatively charged boson resonances B^- produced in the reaction π^-p → B^-p at beam momenta of 40, 100, 200, and 240 GeV. Approximately 600 000 events were included in the final mass spectra. In the mass region 2 < or = M/sub B/ < or = 12.5 GeV no statistically significant enhancements were observed. The 5-standard-deviation upper limit on the production of narrow resonances is of the order of 10 μb for 2 < or = M/sub B/ < or = 10.5 GeV

[en] The reaction p+W→μ⁺μ^-+X has been measured in a high-statistics experiment using a 400 GeV/c proton beam, a magnetized beam dump, and a wide-acceptance detector. Abbreviated results and a comparison with the Drell-Yan Model are presented

[en] We report a high-statistics study of the reaction p+W→μ⁺+μ^-+X with use of an intense 400-GeV/c proton beam, a magnetized-iron beam dump, and a wide-acceptance detector. Using data near x/sub F/ = 0, we have extracted the nucleon sea-quark distribution and find it to be a factor 1.6 +- 0.3 larger than that obtained by inelastic charged-current neutrino scattering. We then compare the Drell-Yan prediction with our data including the previously unexplored region of large x/sub F/ and find excellent agreement for a wide range of μ-pair invariant mass

[en] The tracking chamber design for the Direct Mount support system is discussed in this paper. It is called the Direct Mount design because the chambers are glued directly to the tank. This report continues the testing and study of the first Direct Mount prototype. The reader should keep in mind that our prototype assembly tests were done with materials on hand -- a mixture of tested and untested tubes, and a spacer constructed by gluing empty sleeves together, for a total of about 6 cm