在KATRIN实验上确定$^{\mathrm{83m}}$ Kr跃迁能的一种方法
A method for determining the transition energies of $^{\mathrm{83m}}$Kr at the KATRIN experiment
摘要：
中微子质量实验KATRIN使用来自核异构体$^{\mathrm{83m}}$ Kr的32.2 keV跃迁的转换电子进行校准。将测得的能量与适当的文献值进行比较，可以对能量标度进行独立评估，但伽马能谱法获得的某些文献值的不确定性是一个限制因素。基于KATRIN能量标度的良好线性，本文提出了一种通过高精度电子能谱确定$^{\mathrm{83m}}$ Kr跃迁能量的新方法。值得注意的是，除了来自32.2-keV和9.4-keV跃迁的更频繁级联的转换电子之外，该方法还利用来自$^{\mathrm{83m}}$ Kr到其基态的41.6-keV直接跃迁的转换电子。通过实施该方法，KATRIN可以能够在当前$^{\mathrm{83m}}$ Kr跃迁能量文献值的精度上提供数量级的改进。
英文摘要：
The neutrino mass experiment KATRIN uses conversion electrons from the 32.2 keV transition of the nuclear isomer $^{\mathrm{83m}}$Kr for calibration. Comparing the measured energies to the appropriate literature values allows for an independent evaluation of the energy scale, but the uncertainties in some of the literature values obtained by gamma spectroscopy are a limiting factor. Building upon the already excellent linearity of KATRIN's energy scale, this paper proposes a novel method for determining the $^{\mathrm{83m}}$Kr transition energies via high-precision electron spectroscopy. Notably, the method makes use of conversion electrons from the 41.6-keV direct transition of $^{\mathrm{83m}}$Kr to its ground state in addition to conversion electrons from the much more frequent cascade of a 32.2-keV and a 9.4-keV transition. By implementing this method, KATRIN may be able to deliver order-of-magnitude improvements in precision over current $^{\mathrm{83m}}$Kr transition energy literature values.
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