Weak Interactions in Atomic Physics

原子物理中的弱相互作用

• 批准号: 9012408
• 负责人: Walter Johnson
• 金额: $ 25.07万
• 依托单位: University of Notre Dame
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1990
• 资助国家: 美国
• 起止时间: 1990-09-01 至 1993-02-28
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9012408&HistoricalAwards=false
• 关键词: Weak; Interactions; Atomic; Physics

Precise theoretical values for the amplitudes of parity non-conserving transitions in heavy atoms induced by exchange of neutral Z particles between the nucleus and electrons will be studied. This will permit a determination of the Weinberg angle from atomic physics experiments. The amplitudes are calculated using a relativistic version of many-body perturbation theory. The multiple sum over states needed in evaluating higher order effects are performed using finite basis set techniques often in conjunction with the solution of partial differential equations. With energies, transition amplitudes and hyperfine constants accurate to 1% the parity non-conserving amplitudes can also be obtained with errors at the 1% level.

将研究由中性Z粒子在原子核和电子之间交换引起的重原子宇称非守恒跃迁振幅的精确理论值。这将允许从原子物理实验中确定温伯格角。振幅是用多体微扰理论的相对论版本计算出来的。在评估高阶效应时需要对状态进行多重求和，通常使用有限基集技术与偏微分方程的解相结合。当能量、跃迁振幅和超精细常数精确到1%时，也可以得到误差在1%的宇称非守恒振幅。