Fundamental symmetry tests with optically trapped neutral atoms

光学捕获中性原子的基本对称性测试

• 批准号: 185806-2009
• 负责人: Behr, John
• 金额: $ 9.62万
• 依托单位: TRIUMF
• 依托单位国家: 加拿大
• 项目类别: Subatomic Physics Envelope - Project
• 财政年份: 2011
• 资助国家: 加拿大
• 起止时间: 2011-01-01 至 2012-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=476551
• 关键词: Fundamental; symmetry; tests; optically; trapped

We use laser trapping and cooling techniques to capture radioactive atoms and precisely test the Standard Model (S.M.) of the weak interaction. Confined in a 1 mm-sized cloud, the nuclei undergo beta decay, producing three products: a positron, a neutrino, and a recoiling daughter nucleus. The daughter nucleus has only a few hundred eV of energy and would stop in a nm of material, but it freely escapes the trap. By detecting it in coincidence with the positron, we can measure the momentum and hence the angular distribution of neutrinos more directly than in previous experiments.

我们使用激光捕获和冷却技术来捕获放射性原子，并精确地测试标准模型(S.M.)弱相互作用。在1毫米大小的云层中，原子核经历了β衰变，产生了三种产物：正电子、中微子和后退的子核。子核只有几百eV的能量，可以停在一纳米的物质中，但它可以自由地逃脱陷阱。通过探测它与正电子的符合，我们可以比以前的实验更直接地测量中微子的动量，从而测量中微子的角分布。