Strongly enhanced atomic parity violation due to close levels of opposite parity
Strongly enhanced atomic parity violation due to close levels of opposite parity
复制标题
由于相反宇称的接近水平，强烈增强了原子宇称违反
DOI：
10.1103/physreva.89.042509
复制
发表时间：
2014
影响因子：
2.9
通讯作者：
V. Flambaum
中科院分区：
文献类型：
--
作者：
B. Roberts;V. Dzuba;V. Flambaum
我们目前的核自旋相关和核自旋无关的宇称破坏振幅的Ba，Ra，Ac+，Th和Pa的计算。在这些系统中的宇称不守恒大大增强，由于存在非常接近的电子能级相反的宇称，大的核电荷，和强大的核增强宇称违反效果。所呈现的振幅构成了迄今为止预测的几个最大的原子宇称违反信号。使用这些系统的实验可以用来确定核的反极点矩，即由宇称破坏核力产生的P-奇T -偶核矩。这样的测量可能被证明是研究强子部门宇称破坏的有价值的工具。所考虑的自旋无关跃迁也可以用来测量同一原子的不同同位素的弱电荷比，其结果将作为标准模型和中子分布的测试。钡有七种稳定的同位素，在这方面特别有前途。
We present calculations of nuclear-spin-dependent and nuclear-spin-independent parity-violating amplitudes in Ba, Ra,Ac+, Th, and Pa. Parity nonconservation in these systems is greatly enhanced due to the presence of very close electronic energy levels of opposite parity, large nuclear charge, and strong nuclear enhancement of parity-violating effects. The presented amplitudes constitute several of the largest atomic parity-violating signals predicted so far. Experiments using these systems may be performed to determine values for the nuclear anapole moment, a P-odd T -even nuclear moment given rise to by parity-violating nuclear forces. Such measurements may prove to be valuable tools in the study of parity violation in the hadron sector. The considered spin-independent transitions could also be used to measure the ratio of weak charges for different isotopes of the same atom, the results of which would serve as a test of the standard model and also of neutron distributions. Barium, with seven stable isotopes, is particularly promising in this regard.