38 research outputs found

    A Measurement of νe Appearance and νμ Disappearance Neutrino Oscillations with the NOvA Experiment

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    NOvA is a two-detector, neutrino oscillation experiment on an 810 km baseline in the NuMI beam at Fermilab. NuMI is an off-axis, narrow-band beam centered near 1.8 GeV and is configurable to send a high-purity νμ or -νμ neutrino flux which passes through the NOvA far detector, sensitive to νμ and -νμ disappearance and νe and -νe appearance. The NOvA near and far detectors are functionally identical, liquid scintillator trackers. They are finely segmented relative to the radiation length in the detectors allowing for the detailed reconstruction of electromagnetic shower necessary to identify νe CC events. Through a joint analysis of the appearance and disappearance oscillation channels using neutrino and anti-neutrino data, NOvA constrains the allowed parameter space in δCP, the neutrino mass hierarchy, sin2θ23, and Δm232. We observe 58 and 18 appearance candidates on an expected background of 15.06 and 5.32 events in neutrino and anti-neutrino mode, respectively. This observation gives a 1.77σ preference for the normal mass hierarchy and 1.7σ preference for θ23 in the upper octant. NOvA will maintain its position as a long-baseline oscillation experiment with leading sensitivity for several more years in which time analysis will further disambiguate the fundamental neutrino parameters that determine oscillation behavior.</p

    Prospect of undoped inorganic crystals at 77 Kelvin for low-mass dark matter search at Spallation Neutron Source

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    Investigated in this work were sensitivities of a prototype detector for the detection of low-mass dark matter particles produced at the Spallation Neutron Source at the Oak Ridge National Laboratory in two years of data taking. The presumed prototype consisted of 10 kg undoped CsI or NaI scintillation crystals directly coupled with SiPM arrays operated at 77 K. Compared to the COHERENT CsI(Na) detector, a much higher light yield was assumed for the prototype. An experiment with a cylindrical 1~kg undoped CsI crystal coupled directly to two photomultiplier tubes at about 77~K was conducted as the first step to verify the idea. A light yield of 26.0±0.426.0 \pm 0.4 photoelectrons per keV electron-equivalent was achieved. This eliminated the concern of self light absorption in large crystals raised in some of the early studies.Comment: 12 pages, 18 figure

    Design of a Large-Scale Bridge Structure (semester?), IPRO 315

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    The objectives of this IPRO are to design and build a steel bridge to the specifications given by AISC and, using teamwork, to win this year’s ASCE/AISC Regional Steel Bridge CompetitionDeliverables for IPRO 315: Design of a Large-Scale Bridge Structure for the Spring 2007 semeste

    Design of a Large-Scale Bridge Structure (semester?), IPRO 315: Large-Scale Bridge Structure IPRO 315 Final Report Sp07

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    The objectives of this IPRO are to design and build a steel bridge to the specifications given by AISC and, using teamwork, to win this year’s ASCE/AISC Regional Steel Bridge CompetitionDeliverables for IPRO 315: Design of a Large-Scale Bridge Structure for the Spring 2007 semeste

    Design of a Large-Scale Bridge Structure (semester?), IPRO 315: Large-Scale Bridge Structure IPRO 315 Midterm Report Sp07

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    The objectives of this IPRO are to design and build a steel bridge to the specifications given by AISC and, using teamwork, to win this year’s ASCE/AISC Regional Steel Bridge CompetitionDeliverables for IPRO 315: Design of a Large-Scale Bridge Structure for the Spring 2007 semeste

    Design of a Large-Scale Bridge Structure (semester?), IPRO 315: Large-Scale Bridge Structure IPRO 315 Project Plan Sp07

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    The objectives of this IPRO are to design and build a steel bridge to the specifications given by AISC and, using teamwork, to win this year’s ASCE/AISC Regional Steel Bridge CompetitionDeliverables for IPRO 315: Design of a Large-Scale Bridge Structure for the Spring 2007 semeste

    Design of a Large-Scale Bridge Structure (semester?), IPRO 315: Large-Scale Bridge Structure IPRO 315 Poster Sp07

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    The objectives of this IPRO are to design and build a steel bridge to the specifications given by AISC and, using teamwork, to win this year’s ASCE/AISC Regional Steel Bridge CompetitionDeliverables for IPRO 315: Design of a Large-Scale Bridge Structure for the Spring 2007 semeste

    Design of a Large-Scale Bridge Structure (semester?), IPRO 315: Large-Scale Bridge Structure IPRO 315 Abstract Sp07

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    The objectives of this IPRO are to design and build a steel bridge to the specifications given by AISC and, using teamwork, to win this year’s ASCE/AISC Regional Steel Bridge CompetitionDeliverables for IPRO 315: Design of a Large-Scale Bridge Structure for the Spring 2007 semeste

    Design of a Large-Scale Bridge Structure (semester?), IPRO 315: Large-Scale Bridge Structure IPRO 315 IPRO Day Presentation Sp07

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    The objectives of this IPRO are to design and build a steel bridge to the specifications given by AISC and, using teamwork, to win this year’s ASCE/AISC Regional Steel Bridge CompetitionDeliverables for IPRO 315: Design of a Large-Scale Bridge Structure for the Spring 2007 semeste
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