Towards atomic parity violation in francium : spectroscopy of highly forbidden transitions in rubidium

钫原子宇称不守恒：铷中高度禁戒跃迁的光谱

• 批准号: 375023-2009
• 负责人: Gwinner, Gerald
• 金额: $ 2.5万
• 依托单位: University of Manitoba
• 依托单位国家: 加拿大
• 项目类别: Subatomic Physics Envelope - Research Tools and Instruments
• 财政年份: 2009
• 资助国家: 加拿大
• 起止时间: 2009-01-01 至 2010-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=435747
• 关键词: Towards; atomic; parity; violation; francium

The fundamental forces of nature are one of the fascinating subjects that can be studied at ISAC, Canada's new world-class radioactive beam facility at TRIUMF. In particular, the weak force, causing the beta-decay of nuclei, is unique in exhibiting the phenomenon of parity-violation: the mirror images of physical processes mediated by the weak force are not observed in nature. ISAC offers a unique possibility to study atomic parity-violation in francium (Fr), an element combining a very heavy nucleus (Z=87) with the simple, essentially hydrogenlike, valence structure of an alkali. Fr nuclei are the least stable among the first 103 elements in the periodic table, the longest-lived isotope decays in only 23 minutes. To make optimum use of the minute sample, the Fr atoms will be slowed down with laser light and captured into a `magneto-optical' laser trap, suspended in free space at temperatures millions of times colder than room temperature. Precise laser spectroscopy will allow us to observe the effects of parity-violation. The ultimate goal will be to search for `new' physics outside the - so far very successful - Standard Model of particle physics. The great technical challenge of this experiment is to implement robust and extremely efficient atom-manipulation and signal-detection methods to make optimum use of the minute Fr sample. A precursor experiment with stable rubidium atoms at the University of Manitoba will develop the required techniques and look for the effects of 'negative-energy states'.

自然界的基本力量是可以在加拿大凯旋（Triumf）新的世界级放射性横梁设施ISAC研究的引人入胜的主题之一。特别是，造成核的β-末期的弱力在表现出平等竞选现象时是独一无二的：在自然界中未观察到由弱力介导的物理过程的镜像。 ISAC提供了研究Francium（FR）的原子均衡性侵略的独特可能性，该元素将非常沉重的核（Z = 87）与碱的简单，基本类似氢的，价结构结合在一起。 FR核是周期表中前103个元素中最不稳定的核，这是寿命最长的同位素衰变，仅在23分钟内。为了获得微小样品的最佳使用，FR原子将用激光光放慢速度，并将其捕获到“磁光”激光陷阱中，在温度低于室温的温度百万倍时悬浮在自由空间中。精确的激光光谱将使我们能够观察平等侵犯的影响。最终目标是在粒子物理学的标准模型之外搜索“新的”物理学。该实验的巨大技术挑战是实施强大且极其有效的原子操作和信号检测方法，以最佳地使用微小的FR样品。在曼尼托巴大学对稳定的Rubidium原子进行的前体实验将开发所需的技术，并寻找“负能量状态”的影响。