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Search Results: 1 - 10 of 31006 matches for " Z. Djurcic "
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Neutrino Oscillation Search at MiniBooNE
Z. Djurcic
Physics , 2007, DOI: 10.1016/j.nuclphysbps.2007.02.092
Abstract: This article reports the status of a $\nu_{\mu} \to \nu_{e}$ oscillation search in MiniBooNE (Booster Neutrino Experiment) experiment. If an appearance signal is observed, it will imply Physics Beyond the Standard Model such as the existence of light sterile neutrino.
MiniBooNE Oscillation Results
Zelimir Djurcic
Physics , 2009,
Abstract: These proceedings summarize the MiniBooNE $\nu_{\mu} \to \nu_e$ results, describe the first $\bar{\nu}_{\mu} \to \bar{\nu}_e$ result, and current analysis effort with the NuMI neutrinos detected in the MiniBooNE detector.
New MiniBooNE Results
Zelimir Djurcic
Physics , 2009,
Abstract: The MiniBooNE experiment at Fermilab was designed to be a definitive test of the LSND evidence for neutrino oscillations and has recently reported first results of a search for electron-neutrino appearance in a muon-neutrino Booster beam. No significant excess of events was observed at higher energies, but a sizable excess of events was observed at lower energies. The lack of the excess at higher energies allowed MiniBooNE to rule out simple two-neutrino oscillations as an explanation of the LSND signal. However, the excess at lower energies is presently unexplained. A new data set of neutrinos from the NuMI beam line measured with the MiniBooNE detector at Fermilab has been analyzed. The measurement of NuMI neutrino interactions in MiniBooNE provide a clear proof-of-principle of the off-axis beam concept that is planned to be used by future neutrino experiments such as T2K and NOvA. Moreover, it complements the first oscillation results and will help to determine whether the lower-energy excess is due to background or to new physics. New results from the re-analysis of low energy excess from the Booster beam line and the results from measurements of neutrino interactions from NuMI beam line are discussed. MiniBooNE observes an unexplained excess of $128.8 \pm 20.4 \pm 38.3$ electron-like events in the energy region $200 < E_{\nu} < 475$ MeV. The NuMI data sample currently has a large systematic errors associated with $\nu_{e}$ events, but shows an indication of an excess.
Review of Reactor Antineutrino Experiments
Zelimir Djurcic
Physics , 2012, DOI: 10.1088/1742-6596/408/1/012008
Abstract: As discussed elsewhere, the measurement of a non-zero value for $\theta_{13}$ would open up a wide range of possibilities to explore CP-violation and the mass hierarchy. Experimental methods to measure currently the unknown mixing angle $\theta_{13}$ include accelerator searches for the $\nu_{e}$ appearance and precise measurements of reactor antineutrino disappearance. The reactor antineutrino experiments are designed to search for a non-vanishing mixing angle $\theta_{13}$ with unprecedented sensitivity. This document describes current reactor antineutrino experiments and synergy between accelerator searches for the $\nu_{e}$ appearance and precise measurements of reactor antineutrino disappearance.
MiniBooNE Oscillation Results 2011
Zelimir Djurcic
Physics , 2012, DOI: 10.1088/1742-6596/408/1/012027
Abstract: The MiniBooNE neutrino oscillation search experiment at Fermilab has recently updated results from a search for $\bar\nu_\mu \rightarrow \bar\nu_e$ oscillations, using a data sample corresponding to $8.58 \times 10^{20}$ protons on target in anti-neutrino mode. This high statistics result represent an increase in statistics of 52% compared to result published in 2010. An excess of 57.7 $\pm$ 28.5 events is observed in the energy range 200 MeV $< E_\nu <$ 3000 MeV. The data favor LSND-like $\bar\nu_\mu \rightarrow \bar\nu_e$ oscillations over a background only hypothesis at 91.1% confidence level in the energy range 475 $< E_\nu< $3000 MeV.
Backgrounds in Neutrino Appearance Signal at MiniBooNE
Zelimir Djurcic
Physics , 2006, DOI: 10.1063/1.2220393
Abstract: The MiniBooNE (Booster Neutrino Experiment) experiment is a precise search for neutrino oscillations but is crucially sensitive to background processes that would mimic an oscillation signal. The background sources include intrinsic $\nu_{e}$ from kaon and muon decays, mis-identified $\pi^{0}$, gammas from radiative delta decays, and muon neutrino events mis-identified as electrons. A summary of these backgrounds and the tools to handle them is presented.
Uncertainties in the Anti-neutrino Production at Nuclear Reactors
Z. Djurcic,J. A. Detwiler,A. Piepke,V. R. Foster Jr.,L. Miller,G. Gratta
Physics , 2008, DOI: 10.1088/0954-3899/36/4/045002
Abstract: Anti-neutrino emission rates from nuclear reactors are determined from thermal power measurements and fission rate calculations. The uncertainties in these quantities for commercial power plants and their impact on the calculated interaction rates in electron anti-neutrino detectors is examined. We discuss reactor-to-reactor correlations between the leading uncertainties and their relevance to reactor anti-neutrino experiments.
Reactor Simulation for Antineutrino Experiments using DRAGON and MURE
C. L. Jones,A. Bernstein,J. M. Conrad,Z. Djurcic,M. Fallot,L. Giot,G. Keefer,A. Onillon,L. Winslow
Physics , 2011, DOI: 10.1103/PhysRevD.86.012001
Abstract: Rising interest in nuclear reactors as a source of antineutrinos for experiments motivates validated, fast, and accessible simulations to predict reactor fission rates. Here we present results from the DRAGON and MURE simulation codes and compare them to other industry standards for reactor core modeling. We use published data from the Takahama-3 reactor to evaluate the quality of these simulations against the independently measured fuel isotopic composition. The propagation of the uncertainty in the reactor operating parameters to the resulting antineutrino flux predictions is also discussed.
Design and Testing of a Wireless Demonstrator for Large Instrumentation Systems
H. Sahoo,P. De Lurgio,Z. Djurcic,G. Drake,R. Hashemian,A. Kreps,M. Oberling,T. Pearson
Physics , 2013,
Abstract: In this proceeding, we report the development of a wireless demonstrator intended to readout instrumentation systems having thousands of channels. A data acquisition system was designed and tested based on compliant implementation of 802.11n based hardware and protocols. This project is for large detectors containing photomultiplier tubes. Both free-space optical and radio frequency techniques were tested for wireless power transfer. The front-end circuitry, including a high-voltage power supply was powered wirelessly, thus creating an all-wireless detector readout. The system was successfully tested as a single detector module, which was powered wirelessly and transmitted data wirelessly. The performance of the prototype system and how a large scale implementation of the system might be realized are described in this proceeding.
A Prototype of Wireless Power and Data Acquisition System for Large Detectors
P. De Lurgio,Z. Djurcic,G. Drake,R. Hashemian,A. Kreps,M. Oberling,T. Pearson,H. Sahoo
Physics , 2013,
Abstract: A new prototype wireless data acquisition system has been developed with the intended application to read-out instrumentation systems having a large number of channels. In addition such system could be deployed in smaller detectors requiring increased mobility. The data acquisition and control system is based on 802.11n compliant hardware and protocols. In this paper we describe our case study with a single readout channel performed for a potential large detector containing photomultiplier tubes. The front-end circuitry, including a high-voltage power supply is powered wirelessly thus creating an all-wireless detector readout. The benchmarked performance of the prototype system and how a large scale implementation of the system might be realized are discussed.
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