Measurement of oscillations in solar boron-8 neutrinos and studies of optical scattering in the SNO+ detector
<p>SNO+ is a large-scale liquid scintillator experiment based in Sudbury, Canada, capable of probing many aspects of neutrinos. One major property of interest is the neutrino’s ability to oscillate between different flavours, an indirect demonstration that neutrinos must have mass.</p>...
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| Iaith: | English |
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2023
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| _version_ | 1826311935301255168 |
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| author | Cookman, D |
| author2 | Reichold, A |
| author_facet | Reichold, A Cookman, D |
| author_sort | Cookman, D |
| collection | OXFORD |
| description | <p>SNO+ is a large-scale liquid scintillator experiment based in Sudbury, Canada, capable of probing many aspects of neutrinos. One major property of interest is the neutrino’s ability to oscillate between different flavours, an indirect demonstration that neutrinos must have mass.</p>
<p>This thesis performs the first ever measurement of oscillations from 8B solar neutrinos in the scintillator phase of SNO+. Assuming the current global fit flux of 8 B solar neutrinos, the neutrino oscillation parameter theta_12 was measured to be 38.9 degrees +8.0-7.9 degrees, using an initial 80.6 days of data. This result is consistent with the current global fit result of 33.44 degrees +0.77-0.74 degrees. A sensitivity study indicates that the precision of this result is capable of improving by at least a factor of two within two years of livetime.</p>
<p>On top of this, substantial improvements were made to all aspects of the optical calibration system known as SMELLIE. This is a series of optical-wavelength lasers whose light is emitted from optical fibres attached to the edge of the SNO+ detector. By developing a new analysis, this system was able to measure the scintillator extinction lengths as a function of wavelength and time in-situ for the first time. A new analysis was also built and demonstrated to observe changes in scattering and scintillator re-emission properties of the scintillator as a function of time and wavelength. Alongside this, major upgrades were made to both the hardware and simulation of the SMELLIE system, enabling higher-quality data to be taken, and simulations to be made with much greater speed.</p> |
| first_indexed | 2024-03-07T08:18:38Z |
| format | Thesis |
| id | oxford-uuid:6463ba55-78fd-4c53-8f49-48389d08a74a |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-07T08:18:38Z |
| publishDate | 2023 |
| record_format | dspace |
| spelling | oxford-uuid:6463ba55-78fd-4c53-8f49-48389d08a74a2024-01-18T15:09:10ZMeasurement of oscillations in solar boron-8 neutrinos and studies of optical scattering in the SNO+ detectorThesishttp://purl.org/coar/resource_type/c_db06uuid:6463ba55-78fd-4c53-8f49-48389d08a74aNeutrinosSolar neutrinosCalibrationEnglishHyrax Deposit2023Cookman, DReichold, A<p>SNO+ is a large-scale liquid scintillator experiment based in Sudbury, Canada, capable of probing many aspects of neutrinos. One major property of interest is the neutrino’s ability to oscillate between different flavours, an indirect demonstration that neutrinos must have mass.</p> <p>This thesis performs the first ever measurement of oscillations from 8B solar neutrinos in the scintillator phase of SNO+. Assuming the current global fit flux of 8 B solar neutrinos, the neutrino oscillation parameter theta_12 was measured to be 38.9 degrees +8.0-7.9 degrees, using an initial 80.6 days of data. This result is consistent with the current global fit result of 33.44 degrees +0.77-0.74 degrees. A sensitivity study indicates that the precision of this result is capable of improving by at least a factor of two within two years of livetime.</p> <p>On top of this, substantial improvements were made to all aspects of the optical calibration system known as SMELLIE. This is a series of optical-wavelength lasers whose light is emitted from optical fibres attached to the edge of the SNO+ detector. By developing a new analysis, this system was able to measure the scintillator extinction lengths as a function of wavelength and time in-situ for the first time. A new analysis was also built and demonstrated to observe changes in scattering and scintillator re-emission properties of the scintillator as a function of time and wavelength. Alongside this, major upgrades were made to both the hardware and simulation of the SMELLIE system, enabling higher-quality data to be taken, and simulations to be made with much greater speed.</p> |
| spellingShingle | Neutrinos Solar neutrinos Calibration Cookman, D Measurement of oscillations in solar boron-8 neutrinos and studies of optical scattering in the SNO+ detector |
| title | Measurement of oscillations in solar boron-8 neutrinos and studies of optical scattering in the SNO+ detector |
| title_full | Measurement of oscillations in solar boron-8 neutrinos and studies of optical scattering in the SNO+ detector |
| title_fullStr | Measurement of oscillations in solar boron-8 neutrinos and studies of optical scattering in the SNO+ detector |
| title_full_unstemmed | Measurement of oscillations in solar boron-8 neutrinos and studies of optical scattering in the SNO+ detector |
| title_short | Measurement of oscillations in solar boron-8 neutrinos and studies of optical scattering in the SNO+ detector |
| title_sort | measurement of oscillations in solar boron 8 neutrinos and studies of optical scattering in the sno detector |
| topic | Neutrinos Solar neutrinos Calibration |
| work_keys_str_mv | AT cookmand measurementofoscillationsinsolarboron8neutrinosandstudiesofopticalscatteringinthesnodetector |