Time Reversal, Neutron Structure and Neutron Beta Decay

研究将在以下领域进行：原子永久电偶极矩和基本对称性的精确测量；中高能极化氦-3的电子散射提取中子结构信息；用偏振中子束测量中子半衰期和d系数。未来三年的具体目标是：(1)利用自由进动磁感应探测的He-3磁强计测量Xe-129的永久电偶极矩；(2)发展比磁感应技术灵敏一到两个数量级的新型精密测量技术，应用于电偶极矩实验和量子力学线性和局部洛伦兹不变性等基本思想的检验；(3)进行SLAC实验E-142，极化He-3的极化电子散射，测量中子的自旋相关结构函数，测试Bjorken和规则；(4)运行SLAC实验E-143，将极化H1和极化H2的极化电子散射作为E-142开始的项目的一部分；(5)在Bates进行实验88-25，极化He-3极化电子的包涵准弹性散射；(6)设计一个实验，继续在CEBAF进行包容性和排他性准弹性散射测量，以实现更高的动量传递和更高的精度；(7)采用先进的中子通量测量方法，测量极化中子衰变的d系数，改进中子半衰期测量。

Research will be carried out in the following areas: Precision measurement of atomic Permanent Electric Dipole Moments and fundamental symmetries; electron scattering from polarized He-3 at intermediate and high energies to extract information on neutron structure; neutron beta-decay experiments to measure the neutron half life and measure the D-coefficient with a polarized neutron beam. Specific goals over the next three years are (1) Measurement of the permanent electric dipole moment of Xe-129 with He-3 magnetometry using magnetic induction detection of free precession; (2) Development of new precision measurement techniques one to two orders of magnitude more sensitive than the magnetic induction technique with application to the electric dipole moment experiments and tests of fundamental ideas including Linearity in Quantum Mechanics and Local Lorentz Invariance; (3) To run SLAC experiments E-142, polarized electron scattering from polarized He-3 to measure the spin dependent structure function of the neutron and test the Bjorken sum rule; (4) To run SLAC experiment E-143, polarized electron scattering from polarized H1 and H2 as part of the program begun with E-142; (5) To run experiments 88-25 at Bates, inclusive quasi-elastic scattering of polarized electrons from polarized He-3; (6) To design an experiment to continue the inclusive and exclusive quasi-elastic scattering measurements at CEBAF which will allow higher momentum transfer and greater precision; and (7) To measure the D-coefficient in polarized neutron decay and improve the neutron half life measurements by employing advanced methods of neutron flux measurement.