论文标题
船长CCD中康普顿散射的电子孔对创建能量和FANO因子的限制
Constraints on the electron-hole pair creation energy and Fano factor below 150 eV from Compton scattering in a Skipper-CCD
论文作者
论文摘要
完全消耗的厚厚硅船长电荷耦合设备（船长CCD）是探测中微子和浅黑色相互作用的重要技术，原因是它们的子电子读出噪声。但是，成功搜索稀有中微子或深色 - 象征事件需要信号，并且所有背景都必须充分表征。特别是，对于表征暗物质和中微子信号的表征，必须测量150 eV的电子孔对产生能量和FANO因子。此外，背景辐射的光子可能会在硅体积中散射，产生可以模仿暗物质或中微子信号的事件。我们使用船长CCD和$^{241} $ AM源对Compton Spectrum进行了测量。使用这些数据，我们估计电子孔配对创造能为$ \左（3.71 \ pm 0.08 \右）$ eV在130 K的能量范围内，在99.3 eV和150 eV之间。通过测量康普顿频谱中99.3 eV和150 eV的步骤的宽度，我们引入了一种新型技术来测量Fano因子，将上限设置为90％C.L.的上限为0.31。这些结果证明了船长-CCD表征康普顿频谱并精确测量150 eV以下的Fano因子和电子孔对创造能的潜力。
Fully-depleted thick silicon Skipper-charge-coupled devices (Skipper-CCDs) are an important technology to probe neutrino and light-dark-matter interactions due to their sub-electron read-out noise. However, the successful search for rare neutrino or dark-matter events requires the signal and all backgrounds to be fully characterized. In particular, a measurement of the electron-hole pair creation energy below 150 eV and the Fano factor are necessary for characterizing the dark matter and neutrino signals. Moreover, photons from background radiation may Compton scatter in the silicon bulk, producing events that can mimic a dark matter or neutrino signal. We present a measurement of the Compton spectrum using a Skipper-CCD and a $^{241}$Am source. With these data, we estimate the electron-hole pair-creation energy to be $\left(3.71 \pm 0.08\right)$ eV at 130 K in the energy range between 99.3 eV and 150 eV. By measuring the widths of the steps at 99.3 eV and 150 eV in the Compton spectrum, we introduce a novel technique to measure the Fano factor, setting an upper limit of 0.31 at 90% C.L. These results prove the potential of Skipper-CCDs to characterize the Compton spectrum and to measure precisely the Fano factor and electron-hole pair creation energy below 150 eV.
