中子消失与LZ核反冲事件
Neutron disappearance and the LZ nuclear recoil event
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中文总结 AI 辅助
LZ实验的248 keV核反冲事件被解释为束缚中子消失，可能是自发衰变或暗物质诱导，其反冲谱和约束条件取决于能量释放大小及阈值条件。
中文摘要 AI 辅助
LZ实验报告了一次能量为$E_R=248$ keV的核反冲，该能量接近氙中典型中子的运动能量。这促使我们将该事件解释为束缚中子的消失，无论是通过自发衰变还是暗物质引发的反应。如果释放的能量很大，预测的反冲谱在观测值附近是宽的；只有约$\sim10\\%$的氙事件能避免额外的核活动；消失速率与靶核无关，并受到氧实验的温和约束。在近阈值的暗物质诱导中子消失的特殊情况下，该过程在氙中可以是开放的而在氧中是封闭的，安静事件比例升至约$\sim30\\%$，反冲谱变为谱线。
英文摘要
The LZ experiment reported a nuclear recoil with anomalous energy $E_R=248$ keV, around the typical neutron motion in xenon. This motivates interpreting the event as the disappearance of a bound neutron, either through spontaneous decay or a dark-matter-induced reaction. If the energy released is large, the predicted recoil spectrum is broad around the observed value; only $\sim10\%$ of xenon events avoid extra nuclear activity; the disappearance rate is target-independent and mildly constrained by oxygen experiments. In the special case of near-threshold DM-induced neutron disappearance, it can be open in xenon and closed in oxygen, the quiet fraction rises to $\sim30\%$, the recoil spectrum turns into lines.
发表机构
- The University of Osaka（大阪大学）
- Università di Pisa（比萨大学）
机构由 AI 辅助整理，请以论文原文为准。
