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| Author | : Samantha Short |
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| Release | : 2013 |
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| Author | : Dave Shaw |
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| Release | : 2018 |
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| Author | : Caio Augusto Pelegrina Del Bianco Licciardi |
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| Total Pages | : 0 |
| Release | : 2012 |
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In this thesis, I present a measurement of the absolute inclusive cross section of single + production induced by neutral current interactions ( (NCS +)). I also present a method to identify particles stopping in the Fine Grained Detectors (FGDs). An introductory description of neutrino physics, as well as of the T2K experiment and the ND280 tracker system are included for completeness. Other important contributions to the development of the FGDs, including the selection and characterization of the wavelength shifting bers used in these detectors, as well as their commissioning at JPARC, are also discussed in the thesis. The particle identi cation with the FGDs is based on the reconstructed deposited energy versus track length. It is primarily devoted to separate stopping protons from pions. In particular, this method can distinguish between exiting and stopping muons (or pions). In the measurement of (NCS +), the tracker system of the near detector (ND280) of the T2K experiment is used to reconstruct the particles and respective kinematics. It consists of two FGDs and three Time Projection Chambers (TPCs). One of the FGDs provides a target mass of 1 tonne for neutrino interactions, out of it 93% is composed of CH. The number of neutrino interactions used in this thesis corresponds to a total of 1:077 1020 protons on target at the Japan Proton Accelerator Research Complex (JPARC) facility in Tokai, collected during the T2K Run-1 and Run-2 data acquisition periods. Since the ND280 is 2:5 o the neutrino beam direction, its energy spectrum has a narrow width with peak at near 0.6 GeV. The analysis is based on NEUT Monte Carlo (MC) predictions for neutrino-nucleus interactions. The achieved e ciency and purity in the selection of forward-going + are 39% and 21%, respectively, for pions with momentum between 0.2 and 1.1 GeV/c. Systematic errors arising from neutrino ux uncertainties, event reconstruction and neutrino interaction models have been considered in the analysis. The ratio data to MC simulation is data= MC
| Author | : Universitat de València. Facultat de Física |
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| Total Pages | : 161 |
| Release | : 2008 |
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| Author | : Chiraz Ferchichi |
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| Total Pages | : 0 |
| Release | : 2014 |
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The T2K experiment studies the properties of neutrinos, particularly neutrino oscillations. It takes place in Japan and uses a muonic neutrino beam produced by the J-PARC accelerator complex, a near detector, ND280 on the J-PARC site in order to characterise the beam, and a far detector, Super-Kamiokande 295 km away in order to measure the neutrino oscillations. The near detector is also used to study the neutrino interactions and the goal of this thesis is the measurement of muonic neutrino deep inelastic scattering cross sections.The thesis first introduces neutrino physics, then the T2K experiment and more particularly the time projection chambers of the near detector, and its data quality checking that I was in charge of. The analysis is based on the T2K data recorded until 2013. The selection of charged current muonic neutrino interactions is then presented, as well as a preliminary study of the selection of charged current muonic neutrino interactions with the production of a neutral pion. A criterion on track multiplicity allows enriching the former sample in interactions corresponding to a neutrino deep inelastic scattering. Finally a fit, first validated on simulated data, allows the extraction of the muonic neutrino deep inelastic scattering cross sections.
| Author | : Leon James Pickard |
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| Release | : 2016 |
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| Total Pages | : 127 |
| Release | : 2010 |
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Understanding of the ?0 production via neutrino-nucleus neutral current interaction in the neutrino energy region of a few GeV is essential for the neutrino oscillation experiments. In this thesis, we present a study of neutral current ?0 production from muon neutrinos scattering on a polystyrene (C8H8) target in the SciBooNE experiment. All neutrino beam data corresponding to 0.99 × 1020 protons on target have been analyzed. We have measured the cross section ratio of the neutral current ?0 production to the total charge current interaction and the ?0 kinematic distribution such as momentum and direction. We obtain [7.7 ± 0.5(stat.) ± 0.5(sys.)] × 10-2 as the ratio of the neutral current neutral pion production to total charged current cross section; the mean energy of neutrinos producing detected neutral pions is 1.1 GeV. The result agrees with the Rein- Sehgal model, which is generally used for the Monte Carlo simulation by many neutrino oscillation experiments. We achieve less than 10 % uncertainty which is required for the next generation search for ?æ → ?e oscillation. The spectrum shape of the ?0 momentum and the distribution of the ?0 emitted angle agree with the prediction, which means that not only the Rein-Sehgal model but also the intra-nuclear interaction models describe our data well. We also measure the ratio of the neutral current coherent pion production to total charged current cross section to be (1.17 ± 0.23 ) × 10-2 based on the Rein and Sehgal model. The result gives the evidence for non-zero coherent pion production via neutral current interaction at the mean neutrino energy of 1.0 GeV.
| Author | : Alan Javier Cedeno |
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| Total Pages | : 123 |
| Release | : 2018 |
| Genre | : Electronic dissertations |
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The NONA neutrino experiment based in Fermilab is designed to measure ! e neutrino oscillations. This experiment will give us insight into the properties of massive neutrinos. Neutral current (NC) ;e neutral pion production events can mimic the ! e oscillation signal and therefore are an important background for NONA to understand. Neutral pions decay into two photons which can fake a single electron shower ( e appearance signal) in two ways: either the 2 photons can merge together or one of them may escape detection. In order to constrain this background, NONA utilizes the Near Detector to measure neutral current 0 neutrino interactions. In this analysis, neutrino-Nucleus ( !N) NC 0 interactions with total pion energy greater then 0.3 GeV are studied by selecting two prong events with two final state photons as determined by prong based Convolutional Visual Networks (CVN). The analysis is performed on 3.54x1021 Protons On Target (POT) of NONA Near Detector simulated data and compared to 8.09x1020 POT of data. Optimization of the selection based on fractional cross-section uncertainty and an initial energy resolution study of the final sample are presented. The final 2 prong selection using prong based CVN gave a purity of 74%, selection efficiency of 1.8%, and an expected (NC) ;e neutral pion cross section of 15.2%.
| Author | : Matthew Lawe |
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| Release | : 2015 |
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| Total Pages | : 214 |
| Release | : 2010 |
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