Anapole Moment Studies in Francium

研究人员将在光阱中测量最重的碱金属<$的阿那坡矩。原子核的再极点矩是一个宇称不守恒、时间反演守恒的矩，它产生于核子之间的弱相互作用。在实验中，通过测量基态超精细能级上电偶极原子跃迁的跃迁速率变化，可以探测到超精细能级上的电偶极原子跃迁。这个实验需要用加速器在线捕获铥原子，冷却并将它们运送到第二个科学室，原子将被放置在一个固定的微波腔的波腹处。阿那极矩的测量是研究核内中性弱相互作用的一种独特的方法。本计画结合原子分子与光学物理的精密测量技术，以及对低能核结构的最新了解，以阐明弱相互作用。本研究将涉及研究生与博士后研究助理，与相关教职人员密切合作。

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.