Time Reversal, Neutron Structure, and Neutron Beta Decay

一项实验将在NIST反应堆冷中子设施中进行，目的是改善目前对粒子相互作用时间反转不变性的限制。这项实验是基于极化中子的β衰变。时间反转破坏是一个非常重要的话题，也是当前非常感兴趣的问题，因为它主要影响到宇宙是如何进化到包含物质而不是反物质的巨大优势的问题。第二个实验将在洛斯阿拉莫斯进行，使用一束冷的极化中子束来研究俘获过程中中子和质子之间的弱相互作用，从而导致氢。这种测量将对违反核子-核子力的宇称部分施加限制。此外，该装置还将用于测量中子电荷半径的中子-电子散射实验。将在激光光学泵浦方面开展其他开发工作，以生产极化中子和原子核，包括放射性物质。研究生和博士后是拟议的研究活动的组成部分。

An experiment will be carried out at the NIST reactor cold neutron facility aimed at improving the current limits on time reversal invariance of particle interactions. The experiment is based on the beta-decay of polarized neutrons. Time reversal violation is a very important topic and of great current interest because it impacts, centrally, the question of how the universe evolved to contain a huge preponderance of matter over anti-matter. A second experiment will be carried out at Los Alamos using a cold, polarized neutron beam to study the weak interaction between neutrons and protons in the capture process leading to deuterium. This measurement will place limits on the parity violating parts of the nucleon-nucleon force. In addition, this apparatus will be used in a neutron-electron scattering experiment designed to measure the neutron charge radius. Other development work will be carried out in laser optical pumping as connected with the production of polarized neutrons and nuclei, including radioactive species. Graduate student and postdocs are integral to the proposed research activities.