The observation of vibrating pear-shapes in radon nuclei
The observation of vibrating pear-shapes in radon nuclei
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DOI：
10.1038/s41467-019-10494-5
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发表时间：
2019-06-06
影响因子：
16.6
通讯作者：
Zielinska, M.
中科院分区：
文献类型：
--
作者：
Butler, P. A.;Gaffney, L. P.;Zielinska, M.
有大量证据表明原子核可以发生八极畸变并呈现梨形。这种现象对于原子电偶极矩的测量非常重要，这将表明CP破坏，从而探测超出粒子物理标准模型的物理现象。氡和镭的同位素已被确定为此类测量的候选者。在这里，我们通过加速这些放射性核的束流观察了 Rn-224 和 Rn-226 中的低位量子态。我们表明，氡同位素经历八极振动，但在基态下不具有静态梨形。我们得出的结论是，氡原子为增强可测量的原子电偶极矩提供了不太有利的条件。
There is a large body of evidence that atomic nuclei can undergo octupole distortion and assume the shape of a pear. This phenomenon is important for measurements of electric-dipole moments of atoms, which would indicate CP violation and hence probe physics beyond the Standard Model of particle physics. Isotopes of both radon and radium have been identified as candidates for such measurements. Here, we observed the low-lying quantum states in Rn-224 and Rn-226 by accelerating beams of these radioactive nuclei. We show that radon isotopes undergo octupole vibrations but do not possess static pear-shapes in their ground states. We conclude that radon atoms provide less favourable conditions for the enhancement of a measurable atomic electric-dipole moment.