Fundamental measurements with cold neutrons: Nab and BL3 experiments

该项目包括橡树岭国家实验室的Nab实验和美国国家标准与技术研究所的BL 3实验。Nab将对某些中子衰变参数进行最精确的测量，BL 3实验将用中子束进行最精确的中子寿命测量。这两个实验将共同揭示当今领先的粒子物理学理论，并帮助我们找到一个真正描述我们生活的世界的理论。Nab目前处于调试阶段，将收集2022-2025年的物理数据。加拿大Nab小组负责测试实验中使用的新型大面积Si探测器，为此目的，我们在马尼托巴大学建造了一个可操纵的30 keV质子加速器。该小组已经用30 keV的质子测试了一套Nab Si探测器，将建立一个新的探测器支架，并测试另一系列探测器，以研究各种探测器系统的影响，使Nab实验能够达到其误差预算目标。此外，该小组的成员将参与物理数据采集和数据分析。加拿大BL 3小组负责测试BL 3实验所使用的Si探测器，这些探测器与Nab实验所使用的Si探测器非常相似。被称为质子背散射的系统效应，其中质子从Si探测器表面的表面散射，将作为质子能量和背散射角的函数进行研究。这项研究将提供关键信息，以确保BL 3满足其系统误差目标。该项目的HQP包括一名博士后，两名研究生，和一名本科生每个夏天（3个夏天）。这些人员将：在马尼托巴大学建造Nab Si探测器表征架并用30 keV质子束进行测试。在马尼托巴大学的30 keV质子束线探测器试验箱中开发硬件并实现反向散射探测器。通过在ORNL进行数据轮班和物理数据分析，与更大的Nab协作进行对接。在国家和国际会议上介绍他们与30 keV质子束、Nab Si探测器测试和Si表面质子后向散射有关的工作，并在适当的参考科学期刊上发表结果。通过这些活动，HQP将获得计算机辅助设计和建模，简单加工，真空硬件，电子信号处理和数据采集技术，先进的计算和数据分析实践以及演示和写作方法方面的宝贵技能和经验。此外，博士后和研究生将获得宝贵的指导经验，而他们与本科生一起工作，以完成项目。这些技能将为他们的各种职业做好准备，特别是那些在加拿大的STEM领域。

This project encompasses the Nab experiment, at Oak Ridge National Lab and the BL3 experiment at the National Institute of Standards and Technoloy, both in the USA. Nab will make the most precise measurements of certain neutron decay parameters and the BL3 experiment will make the most precision neutron lifetime measured with a beam of neutrons. Together both experiments will shed light on the leading particle physics theories of today and help us home in on a theory that truly describes the world we live in. Nab is currently in its commissioning phase and will collect physics data from 2022-2025. The Canadian Nab group is responsible for testing the novel large area Si detectors used in the experiment where we have built a steerable 30 keV proton accelerator at the University of Manitoba for this purpose. The group has tested a set of Nab Si detectors with 30 keV protons will build a new detector mount and test another series of detectors to investigate various detector systematic effects so the Nab experiment can reach it error budget goals. In addition, the members of this group will participate in physics data taking data analysis. The Canadian BL3 group is responsible for testing the Si detectors used by the BL3 experiment, which are very similar to the Si detectors used by the Nab experiment. A systematic effect known as proton backscattering, where protons scatter off the surface of the Si detector surface will be studied as a function of proton energy and backscattering angle. This study will provide crucial information to ensure the BL3 meets its systematic error goals. The HQP in this project include one postdoc, two graduate students, and 1 undergraduate student each summer (for 3 summers). These personnel will: Build the Nab Si detector Characterization Mount and test with the 30 keV proton beam at the University of Manitoba. Develop the hardware and implement a backscatter detector into the 30 keV proton beam line detector test chamber at the University of Manitoba. Interface with the larger Nab collaboration, by performing data taking shifts and physics data analysis at ORNL. Present their work related to the 30 keV proton beam, the Nab Si detector tests, and the proton backscattering off Si surfaces at national and international conference and publish the results in the appropriate referred scientific journals. Through these activities the HQP will gain valuable skills and experience in computer aided design and modeling, simple machining, vacuum hardware, electronics signal processing and data acquisition techniques, advanced computing and data analysis practices, and presentation and writing methods. In addition, the postdoc and graduate students will get valuable mentoring experience while they work together with the undergraduate students to complete the projects. These skills will prepare them for a variety of careers, especially those in Canada's STEM fields.