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Measurement of the νe CC π+ cross-section using the ND280 tracker and development of optical diffuser calibration systems for Hyper-Kamiokande
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Valder, S. (2020) Measurement of the νe CC π+ cross-section using the ND280 tracker and development of optical diffuser calibration systems for Hyper-Kamiokande. PhD thesis, University of Warwick.
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Official URL: http://webcat.warwick.ac.uk/record=b3714935~S15
Abstract
Over the last few decades our understanding of the physics that governs neutrino oscillations has evolved rapidly through an experimental program designed to measure the key neutrino oscillation parameters. This thesis provides an overlook into the Tokai to Kamioka (T2K) long baseline accelerator neutrino experiment, and the next generation water Cherenkov detector Hyper-Kamiokande; both designed to make precise measurements of the neutrino oscillation parameters. In the T2K far detector a data excess is seen in the νe charged current π+ sample, a significant channel in electron neutrino appearance studies. An analysis is presented in this thesis to investigate νe charged current π + production using the o↵-axis near detector (ND280) tracker of the T2K experiment. A novel selection has been developed and the systematic uncertainties evaluated to measure a flux averaged cross-section of σ = (2.23 ± 0.39(stat.) ± 0.38(syst.)) × 10-39 cm2 per nucleon. This result provides the first ever cross-section measurement of νe charged current π + production on a carbon target. With kinematic constraints applied, analogous to the far detector sample, preliminary studies indicate no data excess using the near detector. This thesis also presents the research and development of optical calibration systems for Hyper-Kamiokande. A diffuser ball and complimentary enclosure have been designed for PMT energy and timing calibration in water Cherenkov detectors. Experimental measurements under laboratory conditions have been made to test the relative performances throughout development stages. Furthermore, the diffuser systems have been successfully deployed into the Super-Kamiokande detector, where preliminary studies indicate the systems work as expected.
Item Type: | Thesis (PhD) | ||||
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Subjects: | Q Science > QC Physics | ||||
Library of Congress Subject Headings (LCSH): | Neutrino interactions, Neutrinos, Neutrinos -- Measurement, Cherenkov counters | ||||
Official Date: | October 2020 | ||||
Dates: |
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Institution: | University of Warwick | ||||
Theses Department: | Department of Physics | ||||
Thesis Type: | PhD | ||||
Publication Status: | Unpublished | ||||
Supervisor(s)/Advisor: | Boyd, Steve B. ; Barker, Gary John | ||||
Format of File: | |||||
Extent: | xxii, 186 leaves : illustrations (some colour) | ||||
Language: | eng |
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