82 research outputs found

    Construction of PVC Extrusions for the NOνA Near and Far Detectors

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    AbstractNOνA, or NuMIOff-Axis νe Appearance experiment, is a long-baseline neutrino experiment using an off-axis beam produced by the main injector (NuMI) neutrino beamline at Fermilab. The experiment is designed to study νμ to νe oscillations.It consistsoftwoPVCand liquid scintillator detectorsanda beamline upgrade. Thefar detector weighs 14 kton and will be located in Ash River, Minnesota, 810km from NuMI. The smaller, 220 ton near detector will be located underground at Fermi National Accelerator Laboratory. Each detector consists of planes of PVC extrusions containing liquid scintillator and wavelength shifting fiber. The PVC extrusions are made using a formula specially designed for high reflectivity, ease of extrusion and tensile qualities. Custom extrusion dies and extruding procedures havebeencreatedto ensureauniformproductthatholdstostrict dimensionalandmaterial tolerances.The construction of the NOνAnear detector on the surface (NDOS) extrusions will be presented, addressing the challenges of creating physics qualityPVCextrusionsandtheQA techniquesusedto ensurethat quality. Finally, preparationsfor construction of thefar detector willbe discussed

    Combined Analysis of nu(mu) Disappearance and nu(mu) -\u3e nu(e) Appearance in MINOS Using Accelerator and Atmospheric Neutrinos

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    We report on a new analysis of neutrino oscillations in MINOS using the complete set of accelerator and atmospheric data. The analysis combines the nu(mu) disappearance and nu(e) appearance data using the three-flavor formalism. We measure vertical bar Delta m(32)(2)vertical bar = [2.28-2.46] x 10(-3) eV(2) (68% C.L.) and sin(2)theta(23) = 0.35-0.65 (90% C.L.) in the normal hierarchy, and vertical bar Delta m(32)(2)vertical bar = [2.32-2.53] x 10(-3) eV(2) (68% C.L.) and sin(2)theta(23) = 0.34-0.67 (90% C.L.) in the inverted hierarchy. The data also constrain delta(CP), the theta(23) octant degeneracy and the mass hierarchy; we disfavor 36% (11%) of this three-parameter space at 68% (90%) C.L

    An improved measurement of muon antineutrino disappearance in MINOS

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    We report an improved measurement of muon anti-neutrino disappearance over a distance of 735km using the MINOS detectors and the Fermilab Main Injector neutrino beam in a muon anti-neutrino enhanced configuration. From a total exposure of 2.95e20 protons on target, of which 42% have not been previously analyzed, we make the most precise measurement of the anti-neutrino "atmospheric" delta-m squared = 2.62 +0.31/-0.28 (stat.) +/- 0.09 (syst.) and constrain the anti-neutrino atmospheric mixing angle >0.75 (90%CL). These values are in agreement with those measured for muon neutrinos, removing the tension reported previously.Comment: 5 pages, 4 figures. In submission to Phys.Rev.Let

    Measurement of the neutrino mass splitting and flavor mixing by MINOS

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    Measurements of neutrino oscillations using the disappearance of muon neutrinos from the Fermilab NuMI neutrino beam as observed by the two MINOS detectors are reported. New analysis methods have been applied to an enlarged data sample from an exposure of 7.25imes10207.25 imes 10^{20} protons on target. A fit to neutrino oscillations yields values of Deltam2=(2.320.08+0.12)imes103|Delta m^2| = (2.32^{+0.12}_{-0.08}) imes10^{-3},eV2^2 for the atmospheric mass splitting and m sin^2!(2 heta) > 0.90 (90%,C.L.) for the mixing angle. Pure neutrino decay and quantum decoherence hypotheses are excluded at 7 and 9 standard deviations, respectively
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