用于寻找强CP破坏的锕系与镧系分子
Actinide and lanthanide molecules to search for strong CP-violation
AI总结：
本研究针对含八极形变镧系、锕系核的双原子分子，分析其席夫矩增强效应，发现这类体系的CP破坏参数测量灵敏度可比现有最优水平高数个量级，有望推动对CP破坏基本相互作用的认知。
摘要：
原子核内部基本CP破坏相互作用的存在会导致核席夫矩（Schiff moment）的产生。席夫矩势对应于局限在原子核内部、沿核自旋方向分布的电场。该电场可与原子的电子相互作用，诱导整个系统产生固有电偶极矩（EDM）。具有八极形变的原子核中，席夫矩及相应电场会得到增强，进而导致原子EDM增强。此外，由于存在能量接近的宇称相反能级，分子中的T、P破坏效应还会出现数个量级的增强。我们研究了一类含八极形变镧系与锕系核的双原子分子中的席夫矩增强效应，涉及的分子包括：$^{227}$AcF、$^{227}$AcN、$^{227}$AcO$^+$、$^{229}$ThO、$^{153}$EuO$^+$ 和 $^{153}$EuN。将目前在含球形核的抗磁分子（$^{205}$TlF）中测量EDM的实验成果推广到上述研究体系，有望对量子色动力学参数${\bar θ}$及其他强子CP破坏参数实现极高的测量灵敏度，其灵敏度将比当前最优限制高出数个量级。这可能会对现代关于CP破坏基本相互作用本质的认知产生重大影响。
英文摘要：
The existence of the fundamental CP-violating interactions inside the nucleus leads to the existence of the nuclear Schiff moment. The Schiff moment potential corresponds to the electric field localized inside the nucleus and directed along its spin. This field can interact with electrons of an atom and induce the permanent electric dipole moment (EDM) of the whole system. The Schiff moment and corresponding electric field are enhanced in the nuclei with the octupole deformation leading to the enhanced atomic EDM. There is also a few-order enhancement of the T,P-violating effects in molecules due to the existence of energetically close levels of opposite parity. We study the Schiff moment enhancement in the class of diatomic molecules with octupole-deformed lanthanide and actinide nuclei: $^{227}$AcF, $^{227}$AcN, $^{227}$AcO$^+$, $^{229}$ThO, $^{153}$EuO$^+$ and $^{153}$EuN. Projecting the existing experimental achievements to measure EDM in diamagnetic molecules with spherical nucleus ($^{205}$TlF) to the considered systems one can expect a very high sensitivity to the quantum chromodynamics parameter ${\bar θ}$ and other hadronic CP-violation parameters surpassing the current best limits by several orders of magnitude. It can have a dramatic impact on the modern understanding of the nature of CP-violating fundamental interactions.
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