Anapole Moment Studies in Francium

研究人员将在光学陷阱中测量最重的碱金属--法郎的极点时刻。原子核的极点矩是一种宇称非守恒的时间反转守恒矩，它是由核子之间的弱相互作用引起的。它可以通过测量在右手和左手坐标系下基态超精细能级中电偶极原子跃迁的跃迁速率的变化来检测。该实验需要用加速器在线捕获Fircium原子，冷却并将它们传输到第二个科学室，在那里原子将被放置在站立的微波腔的反节点。极点力矩的测量是对原子核内中性弱相互作用的独特探测。这项建议将原子分子和光学物理的精密测量技术与对低能核结构的前沿理解结合起来，以阐明弱相互作用。这项研究将包括研究生和博士后研究助理与相关教职员工密切合作。

The researchers will conduct a measurement of the anapole moment in francium, the heaviest of the alkali metals, in an optical trap. The anapole moment of a nucleus is a parity non-conserving, time reversal conserving moment that arises from weak interactions between the nucleons. It can be detected by measuring the change in the transition rate of an electric dipole atomic transition in the ground state hyperfine levels in the presence of a right and left handed coordinate systems.The experiment requires trapping francium atoms on line with an accelerator, cool and transporting them to a second science chamber where the atoms will be placed at the anti-node of a standing microwave cavity. The measurement of an anapole moment is a unique probe for neutral weak interactions inside the nucleus. This proposal combines precision measurement techniques from atomic molecular and optical physics with the forefront understanding of low energy nuclear structure for the elucidation of the weak interaction.This research will involve graduate students and postdoctoral research associates working closely with the faculty members involved.