AI 中文总结
研究固态基质中$^{229}$Th核钟异构体的α和β衰变诱导猝灭，通过离子注入和光谱检测，确定不同晶体中猝灭概率密度，揭示其与基质材料和缺陷密度有关，支持电荷载流子介导的微观机制。
AI 中文摘要
研究了嵌入CaF₂和MgF₂中的$^{229m}$Th核团的辐射衰变动力学。通过离子注入后$^{229}$Ac的β衰变产生异构体，利用真空紫外光谱检测其辐射衰变并随时间测量。这有助于识别和量化α或β辐射引起的辐射衰变信号猝灭。在不同CaF₂晶体和MgF₂晶体中确定了猝灭概率密度，揭示了样品间高达两个数量级的差异以及对基质材料和缺陷密度的强烈依赖性。结果支持了由电荷载流子介导的微观机制，其中衰变辐射产生的电子激发在Th缺陷附近被捕获，从而有利于非辐射衰变通道。
英文摘要
The radiative decay dynamics of an ensemble of $^{229\mathrm{m}}$Th nuclei embedded in CaF$_2$ and MgF$_2$ is investigated. The isomer is populated through $β$ decay of $^{229}$Ac following ion implantation, and its radiative decay is detected using vacuum-ultraviolet spectroscopy and measured as a function of time. This allows to identify and quantify the quenching of the radiative-decay signal induced by $α$ or $β$ radiation. The quenching probability density is determined in different CaF$_2$ crystals and in a MgF$_2$ crystal, revealing differences up to two orders of magnitude between the investigated samples and a strong dependence on the host material and defect densities. The results support a microscopic mechanism mediated by charge carriers in which electronic excitations created by the decay radiation are captured near Th defects, thereby favoring non-radiative decay channels.
Comments13 pages main text and 2 pages supplemental material. Main text contains 7 figures, supplementary material 1
