Measurement of Oscillations in Solar Boron-8 Neutrinos and Studies of Optical Scattering in the SNO+ Detector

太阳硼 8 中微子振荡的测量和 SNO 探测器中光学散射的研究

• 批准号: 2269412
• 金额: --
• 依托单位: University of Oxford
• 依托单位国家: 英国
• 项目类别: Studentship
• 财政年份: 2019
• 资助国家: 英国
• 起止时间: 2019 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-2269412
• 关键词: Measurement; Oscillations; Solar; Boron; Neutrinos

Daniel Cookman will be a graduate student in the SNO+ group at Oxford. His work will be fully integral to the SNO+ collaborations goals of measuring neutrinos from a variety of sources and ultimately of searching for neutrino-less double beta decay. His work will be split into two major areas. The first area is the calibration of the scattering properties of the SNO+ detector in the scintillator phase. The Oxford group is responsible for this calibration system and Daniel will be the main person taking these measurements from the water phase into the scintillator phase of the project. He will pick up the analysis work from the Esther Turner who has led this analysis during the water phase and Daniel will extend it to the new conditions in which absorption and re-emission pose a severe background to Rayleigh and other optical scattering phenomena. This will require more use of the wavelength tenability of our lasers and the absorption spectrum of the scintillator, which will be measured by other calibration systems. The entire optical calibration of the SNO+ detector will have to be approached in a more coherent way because scattering, absorption and detection efficiency measurements will be more coupled than they were in the water phase. Daniel will further automate the analysis process and extend the analysis methods to a measurement of the scattering angle as well as novel methods for signal selection. He will also take over the expertise on the scattering calibration hardware system from Jeffrey Lidgard who is the current expert on this topic because Daniel will become responsible together with our new postdoc for the regular operation of the scattering calibration process.As the detector will be going through the scintillator filling and tellurium loading stages during Daniel DPhil period, he will use the calibration measurements to evaluate the optical quality of the scintillator mix in-situ and search potential contaminations. The second field of work will be a physics analysis. We have not yet picked a definite topic for this but his primary interest lies in measurement of neutrinos from Supernovae. The group already has a strong activity in this with Prof Jeff Tseng and his current graduate student Mr Josh Wang Daniel also shows some interest in the area of geo-anti-neutrinos, which would fit well with the current activities of two students on reactor anti-neutrinos. As of today it is too early to predict how exactly his analysis work will develop but it is clear that the SNO+ collaboration overall only has a small group working on supernova neutrinos and a very small group working on geo-neutrinos and there are many opportunities for Daniel to make a significant contribution.

丹尼尔·库克曼将是牛津大学SNO+组的研究生。他的工作将是SNO+合作目标的完全组成部分，该合作目标是测量来自各种来源的中微子，并最终寻找没有中微子的双贝塔衰变。他的工作将分为两个主要领域。第一个领域是SnO+探测器在闪烁体阶段的散射特性的校准。牛津小组负责这个校准系统，丹尼尔将是将这些测量从水相带入项目闪烁体阶段的主要人员。他将从在水相期间领导这项分析的Esther Turner那里接过分析工作，Daniel将把分析工作扩展到新的条件，在这些条件下，吸收和再发射对瑞利和其他光学散射现象构成了严重的背景。这将需要更多地利用我们激光的波长稳定性和闪烁体的吸收光谱，这将由其他校准系统测量。SnO+探测器的整个光学校准必须以一种更连贯的方式进行，因为散射、吸收和探测效率的测量将比在水相中更加耦合。Daniel将进一步自动化分析过程，并将分析方法扩展到散射角的测量以及信号选择的新方法。他还将从目前这方面的专家Jeffrey Lidgard那里接管散射校准硬件系统的专业知识，因为Daniel将与我们的新博士后一起负责散射校准过程的常规操作。由于探测器将在Daniel DPhil期间经历闪烁体填充和碲加载阶段，他将使用校准测量来现场评估闪烁体混合物的光学质量，并搜索潜在的污染物。第二个工作领域将是物理分析。我们还没有为此选择一个明确的主题，但他的主要兴趣在于测量来自超新星的中微子。该小组在这方面已经有了很大的活动，杰夫·曾教授和他目前的研究生乔希·王·丹尼尔先生也对地球反中微子领域表现出了一些兴趣，这将与两名学生目前关于反应堆反中微子的活动非常吻合。到今天为止，预测他的分析工作将如何发展还为时过早，但很明显，SNO+的合作总体上只有一个小团队在研究超新星中微子，还有一个非常小的团队在研究地中微子，丹尼尔有很多机会做出重大贡献。