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Three-flavour neutrino oscillations with MINOS and CHIPS

Perch, AJ; (2017) Three-flavour neutrino oscillations with MINOS and CHIPS. Doctoral thesis , UCL (University College London). Green open access

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MINOS was a long-baseline neutrino oscillation experiment comprising two functionally identical detectors that observed Fermilab's NuMI neutrino beam in its low energy tune, at distances of 1 km and 735 km. When NuMI switched to a higher-power medium energy tune in 2012, the MINOS detectors continued to operate as MINOS+. Since its commissioning in 2003, the MINOS Far Detector has also been able to detect atmospheric neutrinos. Atmospheric neutrino oscillations are sensitive to the mass splitting m2 32 and mixing angle 23, and are also subject to the Matter E ect as the neutrinos pass through the Earth, which a ects neutrinos and antineutrinos di erently in a way that depends upon the mass hierarchy. This thesis presents the rst atmospheric neutrino analysis using data from the MINOS+ era, and the rst dedicated MINOS atmospheric neutrino analysis to use a full three- avour mixing model. It includes 10.79 kiloton years of new data and encompasses almost an entire period of the 11-year solar cycle, from 2003 to 2014. The CHIPS experiment aims to reduce construction costs of large water Cherenkov detectors to $200-300k per kiloton by submerging detectors with a lightweight structure in bodies of water on the surface of the Earth. Such detectors could reach masses of 1 Mton and would assist with the search for CP violation in the neutrino sector by measuring the rate of e appearance in a beam. A detailed reconstruction framework for CHIPS has been developed, incorporating a novel method based on the timing of PMT hits. This framework has been used to study the performance of di erent designs for a 10 kiloton CHIPS R&D module, and to demonstrate that e events can be identi ed in a sparsely-instrumented detector with a 6% coverage of 3" PMTs.

Type: Thesis (Doctoral)
Title: Three-flavour neutrino oscillations with MINOS and CHIPS
Event: UCL (University College London)
Open access status: An open access version is available from UCL Discovery
Language: English
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
URI: https://discovery.ucl.ac.uk/id/eprint/1551615
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