A R Erwin

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This Letter reports results from the MINOS experiment based on its initial exposure to neutrinos from the Fermilab NuMI beam. The rates and energy spectra of charged current nu(mu) interactions are compared in two detectors located along the beam axis at distances of 1 and 735 km. With 1.27 x 10(20) 120 GeV protons incident on the NuMI target, 215 events(More)
The Main Injector Neutrino Oscillation Search (MINOS) experiment uses an accelerator-produced neutrino beam to perform precision measurements of the neutrino oscillation parameters in the " atmospheric neutrino " sector associated with muon neutrino disappearance. This long-baseline experiment measures neutrino interactions in Fermilab's NuMI neutrino beam(More)
The Neutrinos at the Main Injector (NuMI) facility is a conventional neutrino beam which produces muon neutrinos by focusing a beam of mesons into a long evacuated decay volume. We have built four arrays of ionization chambers to monitor the position and intensity of the hadron and muon beams associated with neutrino production at locations downstream of(More)
A search for depletion of the combined flux of active neutrino species over a 735 km baseline is reported using neutral-current interaction data recorded by the MINOS detectors in the NuMI neutrino beam. Such a depletion is not expected according to conventional interpretations of neutrino oscillation data involving the three known neutrino flavors. A(More)
This Letter reports on a search for nu(mu) --> nu(e) transitions by the MINOS experiment based on a 3.14x10(20) protons-on-target exposure in the Fermilab NuMI beam. We observe 35 events in the Far Detector with a background of 27+/-5(stat)+/-2(syst) events predicted by the measurements in the Near Detector. If interpreted in terms of nu(mu) --> nu(e)(More)
  • G Goldhaber, W B Fowler, S Goldhaber, T F Hoang, T E Kalogeropoulos, W M Powell +73 others
  • 2005
Measurements of differential cross sections for quasielastic electron-deuteron scattering e + d-e + p + n have been made in which recoil protons were detected in coincidence with the scattered electrons. The ratios of the elastic electron-neutron to the electron-proton scattering cross sections are derived from the proton coincidence data. For comparison,(More)
We have measured deconfined hadronic volumes, 4.4 < V < 13.0 fm 3 , produced by a one-dimensional (1D) expansion. These volumes are directly proportional to the charged particle pseudorapidity densities 6.75 < dN c /dη < 20.2. The hadronization temperature is T = 179.5 ± 5(syst) MeV. Using Bjorken's 1D model, the hadronization energy density is F = 1.10 ±(More)
We use K(L)'s in the 100-200 GeV energy range to produce 147 candidate events of the axial vector pair K1(1270)-K1(1400) in the nuclear Coulomb field of a Pb target and determine the radiative widths Gamma(K1(1400)-->K0+gamma)=280.8+/-23.2(stat)+/-40.4(syst) keV and Gamma(K1(1270)-->K0+gamma)=73.2+/-6.1(stat)+/-28.3(syst) keV. These first measurements(More)
We present a new determination of the parity of the neutral pion via the double Dalitz decay pi0-->e+e-e+e-. Our sample, which consists of 30,511 candidate decays, was collected from KL-->pi0pi0pi0 decays in flight at the KTeV-E799 experiment at Fermi National Accelerator Laboratory. We confirm the negative pi0 parity and place a limit on scalar(More)
The past two decades have seen great advances in our understanding of neutrinos. Underground experiments detecting neutrinos produced in the sun and in the earth's atmosphere have shown that neutrinos have mass and that they oscillate from one species to another as they travel. These oscillations arise because the neutrino species produced in particle(More)