研究原子核的变形,以估计对原子电火花加工的灵敏度增强

P. Mohanmurthy, U. Silwal, D. Siwakoti, J. Winger
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引用次数: 0

摘要

观测到的宇宙重子不对称性(BAU)不能用标准模型(SM)中已知的电荷宇称(CP)违逆源来解释。基本粒子、原子核或原子的非零永久电偶极矩(EDM)违反了CP。测量非零永久电偶极矩使我们能够掌握解释观察到的BAU所需的其他CP违反源。具有八极和四极形变原子核的原子的电火花加工增强。因此,寻找这样的原子在测量电火花过程中变得非常重要。在具有变形原子核的$^{225}$Ra原子中,已经证明了EDM搜索的可行性。我们从各种理论模型预测的八极形变核列表中对可能的电火花加工候选者进行了全面的调查。我们对核变形与$^{225}$Ra相当或优于$^{225}$Ra的长寿命同位素的搜索结果为未来基于稀有同位素束设施(FRIB)的原子EDM实验提供了少数可行的候选元素:$^{221}$Rn, $^{221,223,227}$Fr, $^{221,223,225}$Ra, $^{223,227}$ Ac, $^{229}$Th,特别是$^{229}$Pa。此外,$^{223,225}$Rn, $^{225}$Fr和$^{226}$Ac的原子核也具有高度的四极和八极变形,但它们的基态奇偶重态能量差尚未测量到。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Survey of deformation in nuclei in order to estimate the enhancement of sensitivity to atomic EDM
The observed baryon asymmetry of the universe (BAU) cannot be explained by the known sources of charge-parity (CP)-violation in the Standard Model (SM). A non-zero permanent electric-dipole-moment (EDM) for fundamental particles, nuclei or atoms, violates CP. Measuring a non-zero EDM allows us to gain a handle on additional sources of CP-violation required to explain the observed BAU. The EDM of an atom with an octupole and quadrupole deformed nucleus is enhanced. Therefore, the search for such atoms has become important in the quest to measure an EDM. Viability of EDM searches in $^{225}$Ra atoms with a deformed nucleus have already been demonstrated. We have performed a comprehensive survey for possible EDM candidates from a list of octupole deformed nuclei predicted by various theoretical models. Our search of long-lived isotopes with nuclear deformations comparable to or better than $^{225}$Ra results in a handful of viable candidates for future atomic EDM experiments based out of the Facility for Rare Isotope Beams (FRIB): $^{221}$Rn, $^{221,223,227}$Fr, $^{221,223,225}$Ra, $^{223,225,227}$Ac, $^{229}$Th, and particularly $^{229}$Pa. Furthermore, nuclei of $^{223,225}$Rn, $^{225}$Fr and $^{226}$Ac are also highly quadrupole and octupole deformed, but their ground state parity doublet energy difference has not yet been measured.
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