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Measurement of the neutrino–proton neutral current elastic scattering cross section on carbon with the T2K off-axis near detector and development of calibration optics for the Hyper-Kamiokande detector
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Vinning, W. G. S. (2022) Measurement of the neutrino–proton neutral current elastic scattering cross section on carbon with the T2K off-axis near detector and development of calibration optics for the Hyper-Kamiokande detector. PhD thesis, University of Warwick.
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Official URL: http://webcat.warwick.ac.uk/record=b3883987
Abstract
Measurement of the neutrino–proton neutral current elastic scattering cross section on carbon with the T2k off-axis near detector and development of calibration optics for the hyper-kamiokande detector
T2K (Tokai–to–Kamioka) is a long-baseline (295 km), off-axis neutrino oscillation experiment that measures the appearance of electron neutrinos from a high-energy (∼1 GeV) beam composed of mostly muon neutrinos. An analysis of the neutral current elastic cross section is presented using neutrino data collected at the T2K near detector facility. The signal topology is defined as neutral current interactions on the upstream fine-grained detector, FGD1, with at least one proton having Ek > 125MeV and cosθ > 0.4 but no pions present in the final state. With a high purity (0.53) sample selected by the AdaBoost classification algorithm, the flux-averaged cross section was measured as (3.31�}0.36)×10−40 cm2 nucleon−1—in agreement with the value predicted by the nominal configuration of GENIE, which is 3.10×10−40 cm2 nucleon−1. Compared to the same measurement performed with a cutbased signal selection, the fractional uncertainty on the cross section is reduced by 28%. Also measured are the differential cross sections with respect to the kinetic energy dσ/dEk and polar angle dσ/dθ of the primary proton within a reduced phase-space of Ek > 181.71MeV and cosθ > 0.752. These measurements are placed in comparison with various interaction model predictions. Hyper-Kamiokande is a next-generation, megaton-scale neutrino observatory that will succeed Super-Kamiokande as the far detector in an upgraded configuration of T2K known as T2HK. A light injection system for Hyper-Kamiokande is in development by various UK research groups to calibrate its photo-sensor responses and monitor its levels of optical scattering and absorption in-situ. A set of calibration optics developed for this system are presented. Prototypes of these devices were successfully installed at five vertical positions in the Super-Kamiokande tank in mid-2018 and have since been integrated into the detector’s automated calibration routine. An analysis of detector data collected during signal tests of these optics is presented.
Item Type: | Thesis (PhD) | ||||
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Subjects: | Q Science > QC Physics | ||||
Library of Congress Subject Headings (LCSH): | Neutrinos -- Measurements, Neutrino interactions -- Experiments, Neutron-proton interactions, Detectors, Carbon, Oscillations, CP violation (Nuclear physics) | ||||
Official Date: | May 2022 | ||||
Dates: |
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Institution: | University of Warwick | ||||
Theses Department: | Department of Physics | ||||
Thesis Type: | PhD | ||||
Publication Status: | Unpublished | ||||
Supervisor(s)/Advisor: | Barker, Gary John ; Boyd, Steve B. ; Jewkes, Keith ; Mitra, Ankush ; Hadley, David | ||||
Format of File: | |||||
Extent: | xxxi, 272 pages : illustrations, charts | ||||
Language: | eng |
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