A Measurement of the Neutron Beta-Asymmetry Using Ultra-Cold Neutrons Produced in a Superthermal Solid Deuterium Source

该奖项将支持旨在测量中子β衰变后中子自旋和电子发射方向之间的角相关性的研究工作。 该实验利用了洛斯阿拉莫斯中子科学中心的超冷中子。 我们的目标是最终提供一个数量级的精度，这种不对称性是已知的。 这一测量，再加上正在进行的中子寿命测量，可以提供电弱标准模型的灵敏度测试，以及核子弱轴向形状因子的改进值。这项研究工作包含了异常多样化的核和原子实验技术，其规模之大，学生可以对研究过程产生实质性的影响。

This award will support a research effort aimed at measuring theangular correlation between neutron spin and the emission directionof the electron following beta decay of the neutron. The experimentwill utilize ultra-cold neutrons at the Los Alamos Neutron ScienceCenter. The goal is ultimately to provide an order-of-magnitude inthe precision to which this asymmetry is known. This measurment,coupled with ongoing measurements of the neutron lifetime, canprovide sensitive tests of the electroweak standard model, as wellas improved values of the weak axial form factor of the nucleon. The research effort contains an exceptionally diverse collection ofnuclear and atomic experimental techniques, at a scale where a Ph.D. student can have a substantial impact upon the course of theresearch.