Muon-induced 12B and 12N on Daya Bay Reactor Neutrino Experiment PDF Download
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Author: 劉思鑠
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Category : Neutrinos
Languages : en
Pages : 0
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Author: 劉思鑠
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ISBN:
Category : Neutrinos
Languages : en
Pages : 0
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Author: 李聖超
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Category : Neutrons
Languages : en
Pages : 0
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![New Measurement of [theta]13 Via Neutron Capture on Hydrogen at Daya Bay PDF](https://books.google.com/books/content/images/frontcover/AOoRuAEACAAJ?fife=w80-h100)
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Languages : en
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This article reports an improved independent measurement of neutrino mixing angle [theta]13 at the Daya Bay Reactor Neutrino Experiment. Electron antineutrinos were identified by inverse [beta]-decays with the emitted neutron captured by hydrogen, yielding a data set with principally distinct uncertainties from that with neutrons captured by gadolinium. With the final two of eight antineutrino detectors installed, this study used 621 days of data including the previously reported 217-day data set with six detectors. The dominant statistical uncertainty was reduced by 49%. Intensive studies of the cosmogenic muon-induced 9Li and fast neutron backgrounds and the neutron-capture energy selection efficiency, resulted in a reduction of the systematic uncertainty by 26%. The deficit in the detected number of antineutrinos at the far detectors relative to the expected number based on the near detectors yielded sin22[theta]13 = 0.071 ± 0.011 in the three-neutrino-oscillation framework. As a result, the combination of this result with the gadolinium-capture result is also reported.
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Languages : en
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Languages : en
Pages : 29
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Languages : en
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Category :
Languages : en
Pages : 315
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Neutrino oscillation is the quantum mechanical phenomenon whereby neutrinos or antineutrinos can spontaneously transform from one of three flavors0́4 electron, muon, or tau0́4 to another. The Daya Bay Reactor Neutrino Experiment has measured neutrino mixing angle Ø13, for the first time, to world-leading precision. The analysis in this dissertation reports sin22Ø13 = 0.088 0.0088, m232 = 2.54+0:172:54+0:17-0.18 *108́ eV2 and m231 = 2.62 108́23 eV2, assuming m221 = 7.50*108-5 eV2 and normal hierarchy. These measurements were accomplished by the early deployment of six functionally identical detectors to observe antineutrino flux from six nuclear reactors, between 2 to 12 MeV. Half the detectors are sited near the position of maximal oscillation, about 1600m from the reactors, while the rest are located 500m and 550m away at two sites, where the oscillation probability is low. The relative comparison of antineutrino rates and energies at identical near and far detectors provides a direct measurement of Ø13 and m2, while greatly reducing systematic uncertainties. The chapters that follow explain neutrino oscillations, and experiment strategy and construction. My contributions to the experiment are highlighted in more detail in the introductions to chapters 3 through 9. These include a detector camera monitoring system, a sensitivity calculation that helped motivate the early six-detector analysis, and the measurements of oscillation parameters from antineutrino rates and spectra.
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Languages : en
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ISBN: 9781321033243
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Languages : en
Pages : 306
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Neutrino oscillation is a phenomenon that occurs due to mixing between neutrino mass and flavor eigenstates. These oscillations are described by a mixing matrix, the smallest angle of which, [theta]13, remained unmeasured until recently, with the development of a new generation of reactor neutrino oscillation experiments, of which Double Chooz is one. The detection of neutrinos in such experiments is assailed by several types of backgrounds, which are caused by muons traversing in or near the detector, and which may degrade the sensitivity of the [theta]13 measurement. This thesis describes several techniques for vetoing these backgrounds, including hardware systems constructed to efficiently detect muons and veto their resulting events, and targeted software vetoes designed to cut background events. We additionally describe methods to measure the rate and spectrum of the background events remaining after vetoes have been applied. The background-reduced analysis results in a measurement of sin22[theta]13 = 0.091 +0.029-0.032.
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