We investigate a new method to search for keV-scale sterile neutrinos that could account for Dark Matter. Neutrinos trapped in our galaxy could be captured on stable $^{163}$Dy if their mass is greater than 2.83 keV. Two experimental realizations are studied, an integral counting of $^{163}$Ho atoms in dysprosium-rich ores and a real-time measurement of the emerging electron spectrum in a dysprosium-based detector. The capture rates are compared to the solar neutrino and radioactive backgrounds. An integral counting experiment using several kilograms of $^{163}$Dy could reach a sensitivity for the sterile-to-active mixing angle $\sin^2θ_{e4}$ of $10^{-5}$ significantly exceeding current laboratory limits. Mixing angles as low as $\sin^2θ_{e4} \sim 10^{-7}$ / $\rm m_{^{163}\rm Dy}\rm{(ton)}$ could possibly be explored with a real-time experiment.
Electron events from the scattering with solar neutrinos in the search of keV scale sterile neutrino dark matter
在以前的工作中，我们表明，keV规模的不育中微子暗物质$ν_s$是可能的$β$衰变实验中使用的放射性源，如$^3$ T或$^{106}$ Ru的检测。这个暗物质候选者的信号是中微子捕获过程$ν_s + N' \to N +e^-$中产生的单能电子。这些电子的能量大于相关衰变过程$N' \to N +e^- + {\bar ν}_e$中产生的电子的最大能量。因此，信号电子事件远超过$β$衰变谱的终点，并且不被$β$衰变过程污染。另一个可能的背景是太阳中微子与目标物质中的电子散射产生的电子事件，这对探测$ν_s$暗物质是一个潜在的威胁。在这篇文章中，我们详细研究了这种可能的背景，并讨论了它的含义，以检测千电子伏规模的不育中微子暗物质。特别地，在散射过程中，当最终电子的动能与结合能为同一数量级时，考虑了Ru原子中电子的束缚态特征.
LiFE-SNS: LiF Experiment for keV-scale Sterile Neutrino Search
Department of Physics and Astronomy, Seoul National University（首尔大学物理与天文学系）；IBS School, University of Science and Technology (UST)（韩国科学技术院基础科学研究院）；Center for Underground Physics, Institute for Basic Science (IBS)（基础科学研究所地下物理中心）；Korea Research Institute of Standards and Science（韩国计量科学研究院）
Sterile neutrino dark matter in conformal Majoron models
Laboratório de Instrumentação e Física Experimental de Partículas (LIP), Universidade do Minho（葡萄牙米尼奥大学实验粒子物理与仪器实验室）；Department of Physics and Astronomy, University of Hawaii at Manoa（夏威夷大学马诺阿分校物理与天文学系）；Departamento de Física, Escola de Ciências, Universidade do Minho（葡萄牙米尼奥大学理学院物理学系）；Department of Physics, Lund University（瑞典隆德大学物理系）；Departamento de Física da Universidade de Aveiro（葡萄牙阿威罗大学物理系）
KATRIN Sensitivity to keV Sterile Neutrinos with the TRISTAN Detector Upgrade
University of North Carolina, Chapel Hill（北卡罗来纳大学教堂山分校）；Triangle Universities Nuclear Laboratory（三角大学核实验室）；Karlsruhe Institute of Technology (KIT)（卡尔斯鲁厄理工学院）；University of Münster（明斯特大学）；Istituto Nazionale di Fisica Nucleare (INFN) – Sezione di Milano-Bicocca（意大利国家核物理研究所米兰-比科卡分部）
