Time Reversal, Neutron Structure, and Neutron Beta Decay

一项实验将在NIST反应堆冷中子设施进行，旨在提高粒子相互作用时间反转不变性的当前限制。这个实验是基于极化中子的衰变。时间反转违反是一个非常重要的话题，目前非常感兴趣，因为它主要影响到宇宙是如何进化到包含物质比反物质巨大优势的问题。第二个实验将在洛斯阿拉莫斯进行，使用冷偏振中子束来研究中子和质子在捕获过程中产生氘的弱相互作用。这一测量将限制核子-核子力中违反宇称的部分。此外，该装置还将用于中子-电子散射实验，用于测量中子电荷半径。将在激光光泵浦方面进行其他发展工作，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.