发表机构
Max-Planck-Institut für Kernphysik（马克斯·普朗克核物理研究所）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
该研究提出共振诱导轨道电子俘获新方法，可探测低于1.8 MeV阈值的低能反电子中微子，适用于反应堆、地球及太阳中微子探测，还可用于反应堆监测与中微子振荡实验。
AI 中文摘要
我们提出一种基于原子核诱导俘获轨道电子的低能反电子中微子（$\bar{\nu}_e$）探测新方法。该过程具有共振特性，要求反中微子能量精确匹配初态与末态原子系统的能量差。对于连续谱源，无需精细调节即可满足共振条件，有效截面取决于共振处反电子中微子通量的谱强度，而非中微子本身的能量。这为探测此前从未被探测过的低能中微子提供了可能。我们确定了多个候选核素，其可发生向子核激发态的跃迁，对应共振反电子中微子能量低于1.8 MeV的逆β衰变阈值，同时考虑了用于本底抑制的独特原子-核符合信号。我们讨论了该方法对探测低能反应堆中微子、地球中微子及keV量级热太阳中微子的意义，还简要探讨了其在中微子振荡实验和反应堆监测中的应用。
英文摘要
We propose a novel approach to detecting low-energy electron antineutrinos based on the induced capture of orbital electrons by nuclei. This process is resonant, requiring the antineutrino energy to precisely match the energy difference between the final and initial atomic systems. For continuous-spectrum sources, the resonance conditions can be satisfied without fine-tuning, and the effective cross sections depend on the spectral intensity of the $\barν_e$ flux at the resonance rather than on the neutrino energy itself. This opens the possibility of detecting neutrinos of never previously probed low energies. We identify a number of candidate nuclides that allow transitions to excited states of the daughter nuclei corresponding to resonant $\barν_e$ energies below the inverse $β$ decay threshold of 1.8 MeV, and we consider a distinctive atomic-nuclear coincidence signature for background rejection. We discuss implications of the proposed method for detecting low-energy reactor neutrinos, geoneutrinos, and keV-scale thermal solar neutrinos. Applications to neutrino oscillation experiments and to reactor monitoring are also briefly discussed.
Comments9 pages, 3 figures, 1 table. v2: Improved calculation of delayed coincidence probabilities; 6 new candidate nuclides added; Fig.~3 and Table~1 updated accordingly. End Matter added
