S. J. Brice

Publications (56)106.38 Total impact

• Article: Neutrinos from Stored Muons nuSTORM: Expression of Interest

  D. Adey, S. K. Agarwalla, C. M. Ankenbrandt, R. Asfandiyarov, J. J. Back, G. Barker, E. Baussan, R. Bayes, S. Bhadra, V. Blackmore, [......], C. Touramanis, C. D. Tunnel, Y. Uchida, N. Vassilopoulos, M. O. Wascko, A. Weber, E. Wildner, M. J. Wilking, W. Winter, U. K. Yang
  [show abstract] [hide abstract]
  ABSTRACT: The nuSTORM facility has been designed to deliver beams of electron and muon neutrinos from the decay of a stored muon beam with a central momentum of 3.8 GeV/c and a momentum spread of 10%. The facility is unique in that it will: serve the future long- and short-baseline neutrino-oscillation programmes by providing definitive measurements of electron-neutrino- and muon-neutrino-nucleus cross sections with percent-level precision; allow searches for sterile neutrinos of exquisite sensitivity to be carried out; and constitute the essential first step in the incremental development of muon accelerators as a powerful new technique for particle physics. Of the world's proton-accelerator laboratories, only CERN and FNAL have the infrastructure required to mount nuSTORM. Since no siting decision has yet been taken, the purpose of this Expression of Interest (EoI) is to request the resources required to: investigate in detail how nuSTORM could be implemented at CERN; and develop options for decisive European contributions to the nuSTORM facility and experimental programme wherever the facility is sited. The EoI defines a two-year programme culminating in the delivery of a Technical Design Report.
  05/2013;
• Article: Direct Measurement of the Bubble Nucleation Energy Threshold in a CF3I Bubble Chamber

  COUPP Collaboration, E. Behnke, T. Benjamin, S. J. Brice, D. Broemmelsiek, J. I. Collar, P. S. Cooper, M. Crisler, C. E. Dahl, D. Fustin, [......], W. H. Lippincott, T. Moan, T. Nania, R. Neilson, E. Ramberg, A. E. Robinson, A. Sonnenschein, E. Vázquez-Jáuregui, R. A. Rivera, L. Uplegger
  [show abstract] [hide abstract]
  ABSTRACT: We have directly measured the energy threshold and efficiency for bubble nucleation from iodine recoils in a CF3I bubble chamber in the energy range of interest for a dark matter search. These interactions cannot be probed by standard neutron calibration methods, so we develop a new technique by observing the elastic scattering of 12 GeV/c negative pions. The pions are tracked with a silicon pixel telescope and the reconstructed scattering angle provides a measure of the nuclear recoil kinetic energy. The bubble chamber was operated with a nominal threshold of (13.6+-0.6) keV. Interpretation of the results depends on the response to fluorine and carbon recoils, but in general we find agreement with the predictions of the classical bubble nucleation theory. This measurement confirms the applicability of CF3I as a target for spin-independent dark matter interactions and represents a novel technique for calibration of superheated fluid detectors.
  04/2013;
• Article: Dual baseline search for muon antineutrino disappearance at 0.1 eV2<Δm2<100 eV2

  G. Cheng, W. Huelsnitz, A. A. Aguilar-Arevalo, J. L. Alcaraz-Aunion, S. J. Brice, B. C. Brown, L. Bugel, J. Catala-Perez, E. D. Church, J. M. Conrad, [......], Y. Uchida, R. G. Van de Water, J. J. Walding, M. O. Wascko, D. H. White, H. B. White, D. A. Wickremasinghe, M. Yokoyama, G. P. Zeller, E. D. Zimmerman
  [show abstract] [hide abstract]
  ABSTRACT: The MiniBooNE and SciBooNE collaborations report the results of a joint search for short baseline disappearance of ν̅ μ at Fermilab’s Booster Neutrino Beamline. The MiniBooNE Cherenkov detector and the SciBooNE tracking detector observe antineutrinos from the same beam, therefore the combined analysis of their data sets serves to partially constrain some of the flux and cross section uncertainties. Uncertainties in the νμ background were constrained by neutrino flux and cross section measurements performed in both detectors. A likelihood ratio method was used to set a 90% confidence level upper limit on ν̅ μ disappearance that dramatically improves upon prior limits in the Δm2=0.1–100 eV2 region.
  Phys. Rev. D. 09/2012; 86(5).
• Article: Dual baseline search for muon antineutrino disappearance at 0.1 eV^2 < {\Delta}m^2 < 100 eV^2

  MiniBooNE Collaboration, SciBooNE Collaboration, G. Cheng, W. Huelsnitz, A. A. Aguilar-Arevalo, J. L. Alcaraz-Aunion, S. J. Brice, B. C. Brown, L. Bugel, J. Catala-Perez, [......], Y. Uchida, R. G. Van de Water, J. J. Walding, M. O. Wascko, D. H. White, H. B. White, D. A. Wickremasinghe, M. Yokoyama, G. P. Zeller, E. D. Zimmerman
  [show abstract] [hide abstract]
  ABSTRACT: The MiniBooNE and SciBooNE collaborations report the results of a joint search for short baseline disappearance of \bar{{\nu}_{\mu}} at Fermilab's Booster Neutrino Beamline. The MiniBooNE Cherenkov detector and the SciBooNE tracking detector observe antineutrinos from the same beam, therefore the combined analysis of their datasets serves to partially constrain some of the flux and cross section uncertainties. Uncertainties in the {\nu}_{\mu} background were constrained by neutrino flux and cross section measurements performed in both detectors. A likelihood ratio method was used to set a 90% confidence level upper limit on \bar{{\nu}_{\mu}} disappearance that dramatically improves upon prior limits in the {\Delta}m^2=0.1-100 eV^2 region.
  08/2012;
• Article: nuSTORM: Neutrinos from STORed Muons

  P. Kyberd, D. R. Smith, L. Coney, S. Pascoli, C. Ankenbrandt, S. J. Brice, A. D. Bross, H. Cease, J. Kopp, N. Mokhov, [......], J. B. Lagrange, A. de Gouvêa, Y. Kuno, A. Sato, V. Blackmore, J. Cobb, C. D. Tunnell, J. M. Link, P. Huber, W. Winter
  [show abstract] [hide abstract]
  ABSTRACT: The results of LSND and MiniBooNE, along with the recent papers on a possible reactor neutrino flux anomaly give tantalizing hints of new physics. Models beyond the neutrino-SM have been developed to explain these results and involve one or more additional neutrinos that are non-interacting or "sterile." Neutrino beams produced from the decay of muons in a racetrack-like decay ring provide a powerful way to study this potential new physics. In this Letter of Intent, we describe a facility, nuSTORM, "Neutrinos from STORed Muons," and an appropriate far detector for neutrino oscillation searches at short baseline. We present sensitivity plots that indicated that this experimental approach can provide over 10 sigma confirmation or rejection of the LSND/MinBooNE results. In addition we indicate how the facility can be used to make precision neutrino interaction cross section measurements important to the next generation of long-baseline neutrino oscillation experiments.
  06/2012;
• Source

  Available from: Lucio Ludovici

  Article: Fundamental Physics at the Intensity Frontier

  J. L. Hewett, H. Weerts, R. Brock, J. N. Butler, B. C. K. Casey, J. Collar, A. de Gouvea, R. Essig, Y. Grossman, W. Haxton, [......], J. Yeck, M. Yeh, M. Yokoyama, J. Yoo, A. Young, E. Zimmerman, K. Zioutas, M. Zisman, J. Zupan, R. Zwaska
  [show abstract] [hide abstract]
  ABSTRACT: The Proceedings of the 2011 workshop on Fundamental Physics at the Intensity Frontier. Science opportunities at the intensity frontier are identified and described in the areas of heavy quarks, charged leptons, neutrinos, proton decay, new light weakly-coupled particles, and nucleons, nuclei, and atoms.
  05/2012;
• Source

  Available from: Joseph Formaggio

  Article: Light Sterile Neutrinos: A White Paper

  K. N. Abazajian, M. A. Acero, S. K. Agarwalla, A. A. Aguilar-Arevalo, C. H. Albright, S. Antusch, C. A. Arguelles, A. B. Balantekin, G. Barenboim, V. Barger, [......], W. Winter, Y. Y. Y. Wong, T. T. Yanagida, O. Yasuda, M. Yeh, F. Yermia, Z. W. Yokley, G. P. Zeller, L. Zhan, H. Zhang
  [show abstract] [hide abstract]
  ABSTRACT: This white paper addresses the hypothesis of light sterile neutrinos based on recent anomalies observed in neutrino experiments and the latest astrophysical data.
  04/2012;
• Article: First dark matter search results from a 4-kg CF$_3$I bubble chamber operated in a deep underground site

  E. Behnke, J. Behnke, S. J. Brice, D. Broemmelsiek, J. I. Collar, A. Conner, P. S. Cooper, M. Crisler, C. E. Dahl, D. Fustin, [......], M. Hu, I. Levine, W. H. Lippincott, T. Moan, T. Nania, E. Ramberg, A. E. Robinson, A. Sonnenschein, M. Szydagis, E. Vázquez-Jáuregui
  [show abstract] [hide abstract]
  ABSTRACT: New data are reported from the operation of a 4.0 kg CF$_{3}$I bubble chamber in the 6800-foot-deep SNOLAB underground laboratory. The effectiveness of ultrasound analysis in discriminating alpha-decay background events from single nuclear recoils has been confirmed, with a lower bound of $>$99.3% rejection of alpha-decay events. Twenty single nuclear recoil event candidates and three multiple bubble events were observed during a total exposure of 553 kg-days distributed over three different bubble nucleation thresholds. The effective exposure for single bubble recoil-like events was 437.4 kg-days. A neutron background internal to the apparatus, of known origin, is estimated to account for five single nuclear recoil events and is consistent with the observed rate of multiple bubble events. This observation provides world best direct detection constraints on WIMP-proton spin-dependent scattering for WIMP masses $>$20 GeV/c$^{2}$ and demonstrates significant sensitivity for spin-independent interactions.
  04/2012;
• Article: Dual baseline search for muon neutrino disappearance at 0.5 eV2<Δm2<40 eV2

  K. B. M. Mahn, Y. Nakajima, A. A. Aguilar-Arevalo, J. L. Alcaraz-Aunion, C. E. Anderson, A. O. Bazarko, S. J. Brice, B. C. Brown, L. Bugel, J. Cao, [......], R. Van de Water, J. J. Walding, M. O. Wascko, D. H. White, H. B. White, M. J. Wilking, M. Yokoyama, H. J. Yang, G. P. Zeller, E. D. Zimmerman
  [show abstract] [hide abstract]
  ABSTRACT: The SciBooNE and MiniBooNE collaborations report the results of a νμ disappearance search in the Δm2 region of 0.5–40 eV2. The neutrino rate as measured by the SciBooNE tracking detectors is used to constrain the rate at the MiniBooNE Cherenkov detector in the first joint analysis of data from both collaborations. Two separate analyses of the combined data samples set 90% confidence level (CL) limits on νμ disappearance in the 0.5–40 eV2 Δm2 region, with an improvement over previous experimental constraints between 10 and 30 eV2.
  Phys. Rev. D. 02/2012; 85(3).
• Source

  Available from: Alessandro Curioni

  Article: Test of Lorentz and CPT violation with Short Baseline Neutrino Oscillation Excesses

  The MiniBooNE Collaboration, A. A. Aguilar-Arevalo, C. E. Anderson, A. O. Bazarko, S. J. Brice, B. C. Brown, L. Bugel, J. Cao, L. Coney, J. M. Conrad, [......], H. A. Tanaka, R. Tayloe, M. Tzanov, R. G. Van de Water, M. O. Wascko, D. H. White, M. J. Wilking, H. J. Yang, G. P. Zeller, E. D. Zimmerman
  [show abstract] [hide abstract]
  ABSTRACT: The sidereal time dependence of MiniBooNE electron neutrino and anti-electron neutrino appearance data are analyzed to search for evidence of Lorentz and CPT violation. An unbinned Kolmogorov-Smirnov test shows both the electron neutrino and anti-electron neutrino appearance data are compatible with the null sidereal variation hypothesis to more than 5%. Using an unbinned likelihood fit with a Lorentz-violating oscillation model derived from the Standard Model Extension (SME) to describe any excess events over background, we find that the electron neutrino appearance data prefer a sidereal time-independent solution, and the anti-electron neutrino appearance data slightly prefer a sidereal time-dependent solution. Limits of order 10E-20 GeV are placed on combinations of SME coefficients. These limits give the best limits on certain SME coefficients for muon neutrino to electron neutrino and anti-muon neutrino to anti-electron neutrino oscillations. The fit values and limits of combinations of SME coefficients are provided.
  09/2011;
• Source

  Available from: Lucio Ludovici

  Article: Dual baseline search for muon neutrino disappearance at 0.5 eV^2 < \Delta m^2 < 40 eV^2

  MiniBooNE, SciBooNE Collaborations: K. B. M. Mahn, Y. Nakajima, A. A. Aguilar-Arevalo, J. L. Alcaraz-Aunion, C. E. Anderson, A. O. Bazarko, S. J. Brice, B. C. Brown, L. Bugel, [......], R. Van de Water, J. J. Walding, M. O. Wascko, D. H. White, H. B. White, M. J. Wilking, M. Yokoyama, H. J. Yang, G. P. Zeller, E. D. Zimmerman
  [show abstract] [hide abstract]
  ABSTRACT: The SciBooNE and MiniBooNE collaborations report the results of a \nu_\mu disappearance search in the \Delta m^2 region of 0.5-40 eV^2. The neutrino rate as measured by the SciBooNE tracking detectors is used to constrain the rate at the MiniBooNE Cherenkov detector in the first joint analysis of data from both collaborations. Two separate analyses of the combined data samples set 90% confidence level (CL) limits on \nu_\mu disappearance in the 0.5-40 eV^2 \Delta m^2 region, with an improvement over previous experimental constraints between 10 and 30 eV^2.
  06/2011;
• Source

  Available from: Lucio Ludovici

  Article: Measurement of K+ production cross section by 8 GeV protons using high energy neutrino interactions in the SciBooNE detector

  The SciBooNE Collaboration, G Cheng, C. Mariani, J. L. Alcaraz-Aunion, S. J. Brice, L. Bugel, J. Catala-Perez, J. M. Conrad, Z. Djurcic, U Dore, [......], I. J. Taylor, R. J. Tesarek, Y Uchida, R. Van de Water, J. J. Walding, M. O. Wascko, H B White, M Yokoyama, G. P. Zeller, E. D. Zimmerman
  [show abstract] [hide abstract]
  ABSTRACT: The SciBooNE Collaboration reports K+ production cross section and rate measurements using high energy daughter muon neutrino scattering data off the SciBar polystyrene (C8H8) target in the SciBooNE detector. The K+ mesons are produced by 8 GeV protons striking a beryllium target in Fermilab Booster Neutrino Beam line (BNB). Using observed neutrino and antineutrino events in SciBooNE, we measure d2{\sigma}/dpd{\Omega} = (5.34 \times 0.76) mb/(GeV/c \times sr) for p + Be -> K+ + X at mean K+ energy of 3.9 GeV and angle (with respect to the proton beam direction) of 3.7 degrees, corresponding to the selected K+ sample. Compared to Monte Carlo predictions using previous higher energy K+ production measurements, this measurement, which uses the NUANCE neutrino interaction generator, is consistent with a normalization factor of 0.85\times0.12. This agreement is evidence that the extrapolation of the higher energy K+ measurements to an 8 GeV beam energy using Feynman scaling is valid. This measurement reduces the error on the K+ production cross section from 40% to 14%.
  05/2011;
• Source

  Available from: ArXiv

  Article: Measurement of the neutrino component of an anti-neutrino beam observed by a non-magnetized detector

  A. A. Aguilar-Arevalo, C. E. Anderson, S. J. Brice, B. C. Brown, L. Bugel, J. M. Conrad, R. Dharmapalan, Z. Djurcic, B. T. Fleming, R. Ford, [......], I. Stancu, R. J. Stefanski, R. Tayloe, M. Tzanov, R. G. Van de Water, M. O. Wascko, D. H. White, M. J. Wilking, G. P. Zeller, E. D. Zimmerman
  [show abstract] [hide abstract]
  ABSTRACT: Two independent methods are employed to measure the neutrino flux of the anti-neutrino-mode beam observed by the MiniBooNE detector. The first method compares data to simulated event rates in a high purity $\numu$ induced charged-current single $\pip$ (CC1$\pip$) sample while the second exploits the difference between the angular distributions of muons created in $\numu$ and $\numub$ charged-current quasi-elastic (CCQE) interactions. The results from both analyses indicate the prediction of the neutrino flux component of the pre-dominately anti-neutrino beam is over-estimated - the CC1$\pip$ analysis indicates the predicted $\numu$ flux should be scaled by $0.76 \pm 0.11$, while the CCQE angular fit yields $0.65 \pm 0.23$. The energy spectrum of the flux prediction is checked by repeating the analyses in bins of reconstructed neutrino energy, and the results show that the spectral shape is well modeled. These analyses are a demonstration of techniques for measuring the neutrino contamination of anti-neutrino beams observed by future non-magnetized detectors.
  02/2011;
• Article: Measurement of the neutrino neutral-current elastic differential cross section on mineral oil at Eν∼1 GeV

  A. A. Aguilar-Arevalo, C. E. Anderson, A. O. Bazarko, S. J. Brice, B. C. Brown, L. Bugel, J. Cao, L. Coney, J. M. Conrad, D. C. Cox, [......], H. A. Tanaka, R. Tayloe, M. Tzanov, R. G. Van de Water, M. O. Wascko, D. H. White, M. J. Wilking, H. J. Yang, G. P. Zeller, E. D. Zimmerman
  [show abstract] [hide abstract]
  ABSTRACT: We report a measurement of the flux-averaged neutral-current elastic differential cross section for neutrinos scattering on mineral oil (CH2) as a function of four-momentum transferred squared, Q2. It is obtained by measuring the kinematics of recoiling nucleons with kinetic energy greater than 50 MeV which are readily detected in MiniBooNE. This differential cross-section distribution is fit with fixed nucleon form factors apart from an axial mass MA that provides a best fit for MA=1.39±0.11 GeV. Using the data from the charged-current neutrino interaction sample, a ratio of neutral-current to charged-current quasielastic cross sections as a function of Q2 has been measured. Additionally, single protons with kinetic energies above 350 MeV can be distinguished from neutrons and multiple nucleon events. Using this marker, the strange quark contribution to the neutral-current axial vector form factor at Q2=0, Δs, is found to be Δs=0.08±0.26.
  Phys. Rev. D. 11/2010; 82(9).
• Source

  Available from: Alessandro Curioni

  Article: Measurement of Neutrino-Induced Charged-Current Charged Pion Production Cross Sections on Mineral Oil at E$_{\nu}\sim 1~\textrm{GeV}$

  A. A. Aguilar-Arevalo, C. E. Anderson, A O Bazarko, S. J. Brice, B. C. Brown, L. Bugel, J Cao, L. Coney, J. M. Conrad, D. C. Cox, [......], H A Tanaka, R. Tayloe, M. Tzanov, R. G. Van de Water, M. O. Wascko, D. H. White, M. J. Wilking, H J Yang, G. P. Zeller, E. D. Zimmerman
  [show abstract] [hide abstract]
  ABSTRACT: Using a high-statistics, high-purity sample of $\nu_\mu$-induced charged current, charged pion events in mineral oil (CH$_2$), MiniBooNE reports a collection of interaction cross sections for this process. This includes measurements of the CC$\pi^+$ cross section as a function of neutrino energy, as well as flux-averaged single- and double-differential cross sections of the energy and direction of both the final-state muon and pion. In addition, each of the single-differential cross sections are extracted as a function of neutrino energy to decouple the shape of the MiniBooNE energy spectrum from the results. In many cases, these cross sections are the first time such quantities have been measured on a nuclear target and in the 1 GeV energy range.
  11/2010;
• Source

  Available from: Lucio Ludovici

  Article: Measurement of inclusive charged current interactions on carbon in a few-GeV neutrino beam

  SciBooNE Collaboration, Y Nakajima, J. L. Alcaraz-Aunion, S. J. Brice, L. Bugel, J. Catala-Perez, G Cheng, J. M. Conrad, Z. Djurcic, U Dore, [......], I. J. Taylor, R. J. Tesarek, Y Uchida, R. Van de Water, J. J. Walding, M. O. Wascko, H B White, M Yokoyama, G. P. Zeller, E. D. Zimmerman
  [show abstract] [hide abstract]
  ABSTRACT: The SciBooNE Collaboration reports a measurement of inclusive charged current interactions of muon neutrinos on carbon with an average energy of 0.8 GeV using the Fermilab Booster Neutrino Beam. We compare our measurement with two neutrino interaction simulations: NEUT and NUANCE. The charged current interaction rates (product of flux and cross section) are extracted by fitting the muon kinematics, with a precision of 6-15% for the energy dependent and 3% for the energy integrated analyses. We also extract CC inclusive interaction cross sections from the observed rates, with a precision of 10-30% for the energy dependent and 8% for the energy integrated analyses. This is the first measurement of the CC inclusive cross section on carbon around 1 GeV. These results can be used to convert previous SciBooNE cross section ratio measurements to absolute cross section values.
  11/2010;
• Source

  Available from: Alessandro Curioni

  Article: Measurement of $\nu_\mu$-induced charged-current neutral pion production cross sections on mineral oil at $E_\nu\in0.5-2.0$ GeV

  A. A. Aguilar-Arevalo, C. E. Anderson, A O Bazarko, S. J. Brice, B. C. Brown, L. Bugel, J Cao, L. Coney, J. M. Conrad, D. C. Cox, [......], H A Tanaka, R. Tayloe, M. Tzanov, R. G. VandeWater, M. O. Wascko, D. H. White, M. J. Wilking, H J Yang, G. P. Zeller, E. D. Zimmerman
  [show abstract] [hide abstract]
  ABSTRACT: Using a custom 3 \v{C}erenkov-ring fitter, we report cross sections for $\nu_\mu$-induced charged-current single $\pi^0$ production on mineral oil (\chtwo) from a sample of 5810 candidate events with 57% signal purity over an energy range of $0.5-2.0$GeV. This includes measurements of the absolute total cross section as a function of neutrino energy, and flux-averaged differential cross sections measured in terms of $Q^2$, $\mu^-$ kinematics, and $\pi^0$ kinematics. The sample yields a flux-averaged total cross section of $(9.2\pm0.3_{stat.}\pm1.5_{syst.})\times10^{-39}$cm$^2$/CH$_2$ at mean neutrino energy of 0.965GeV.
  10/2010;
• Source

  Available from: mit.edu

  Article: Event excess in the MiniBooNE search for ¯νμ→¯νe oscillations.

  A A Aguilar-Arevalo, C E Anderson, S J Brice, B C Brown, L Bugel, J M Conrad, R Dharmapalan, Z Djurcic, B T Fleming, R Ford, [......], I Stancu, R J Stefanski, R Tayloe, M Tzanov, R G Van de Water, M O Wascko, D H White, M J Wilking, G P Zeller, E D Zimmerman
  [show abstract] [hide abstract]
  ABSTRACT: The MiniBooNE experiment at Fermilab reports results from a search for ¯ν_{μ}→¯ν_{e} oscillations, using a data sample corresponding to 5.66×10²⁰ protons on target. An excess of 20.9±14.0 events is observed in the energy range 475<E_{ν}^{QE}<1250  MeV, which, when constrained by the observed ¯ν_{μ} events, has a probability for consistency with the background-only hypothesis of 0.5%. On the other hand, fitting for ¯ν_{μ}→¯ν_{e} oscillations, the best-fit point has a χ² probability of 8.7%. The data are consistent with ¯ν_{μ}→¯ν_{e} oscillations in the 0.1 to 1.0  eV² Δm² range and with the evidence for antineutrino oscillations from the Liquid Scintillator Neutrino Detector at Los Alamos National Laboratory.
  Physical Review Letters 10/2010; 105(18):181801. · 7.37 Impact Factor
• Source

  Available from: Ilan Levine

  Article: Improved Limits on Spin-Dependent WIMP-Proton Interactions from a Two Liter CF$_3$I Bubble Chamber

  E. Behnke, J. Behnke, S. J. Brice, D. Broemmelsiek, J. I. Collar, P. S. Cooper, M. Crisler, C. E. Dahl, D. Fustin, J Hall, J. H. Hinnefeld, M. Hu, I Levine, E. Ramberg, T. Shepherd, A. Sonnenschein, M. Szydagis
  [show abstract] [hide abstract]
  ABSTRACT: Data from the operation of a bubble chamber filled with 3.5 kg of CF$_{3}$I in a shallow underground site are reported. An analysis of ultrasound signals accompanying bubble nucleations confirms that alpha decays generate a significantly louder acoustic emission than single nuclear recoils, leading to an efficient background discrimination. Three dark matter candidate events were observed during an effective exposure of 28.1 kg-day, consistent with a neutron background. This observation provides the strongest direct detection constraint to date on WIMP-proton spin-dependent scattering for WIMP masses $>20$ GeV/c$^{2}$.
  08/2010;
• Source

  Available from: ArXiv

  Article: Photomultiplier Tubes in the MiniBooNE Experiment

  S. J. Brice, L. Bugel, J. M. Conrad, B. Fleming, L. Gladstone, E. Hawker, P Killewald, J May, S. McKenney, P. Nienaber, B. Roe, V. Sandberg, D Smith, M. Wysocki
  [show abstract] [hide abstract]
  ABSTRACT: The detector for the MiniBooNE experiment at the Fermi National Accelerator Laboratory employs 1520 8 inch Hamamatsu models R1408 and R5912 photomultiplier tubes with custom-designed bases. Tests were performed to determine the dark rate, charge and timing resolutions, double-pulsing rate, and desired operating voltage for each tube, so that the tubes could be sorted for optimal placement in the detector. Seven phototubes were tested to find the angular dependence of their response. After the Super-K phototube implosion accident, an analysis was performed to determine the risk of a similar accident with MiniBooNE. Comment: 25 pages, 19 figures
  05/2010;