Abstract

The energy scale of the main spectrometer in the KATRIN tritium project is required to remain stable within ±60 meV at an electron energy of 18.6 keV for two months in order to reach the intended sensitivity of 0.2 eV for the rest mass of the electron antineutrino. A natural source of reference electrons with an energy of 17824.3 ± 0.5 eV based on K-conversion electrons of the 32-keV nuclear γ-transition in ^83mKr from the decay of parent ⁸³Rb was developed for this purpose using precision low-energy nuclear electron spectrometry. The spectroscopic parameters of ^83mKr/⁸³Rb sources fabricated by ion implantation into polycrystalline platinum foils were significantly better than the parameters of vacuum-deposited sources. A large-scale study of the influence of the physicochemical environment of atoms of different radioisotopes in various matrices of vacuum-deposited and implanted radioactive sources on the energy of emitted conversion and Auger electrons and on the structure of the corresponding energy spectra was conducted in the process. The possibility of application of photoelectron sources with a metallic converter as sources of reference electrons for the KATRIN project was also considered.

中文翻译：

---

精密低能核电子光谱在KATRIN Neu中微子项目中的各种应用

摘要

KATRIN project项目中的主光谱仪的能量规模需要在18.6 keV的电子能量下稳定在±60 meV的范围内两个月，以使其余的电子抗中微子的灵敏度达到预期的0.2 eV。为此，使用精确的低能核能，开发了一种天然的参考电子源，其能量为17824.3±0.5 eV，基于从母体⁸³ Rb的衰变在^83m Kr中的32keV核γ跃迁的K转换电子产生。电子光谱。^83m Kr / ⁸³的光谱参数通过离子注入多晶铂箔制备的Rb源明显优于真空沉积源的参数。大规模研究了真空沉积和注入的各种放射源中不同放射性同位素原子的物理化学环境对发射转换能和俄歇电子的能量以及相应能谱结构的影响。处理。还考虑了将光电子源与金属转换器一起用作KATRIN项目的参考电子源的可能性。