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Fully-depleted thick silicon Skipper-charge-coupled devices (Skipper-CCDs)are an important technology to probe neutrino and light-dark-matterinteractions due to their sub-electron read-out noise. However, the successfulsearch for rare neutrino or dark-matter events requires the signal and allbackgrounds to be fully characterized. In particular, a measurement of theelectron-hole pair creation energy below 150 eV and the Fano factor arenecessary 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 ameasurement of the Compton spectrum using a Skipper-CCD and a $^{241}$Amsource. With these data, we estimate the electron-hole pair-creation energy tobe $\left(3.71 \pm 0.08\right)$ eV at 130 K in the energy range between 99.3 eVand 150 eV. By measuring the widths of the steps at 99.3 eV and 150 eV in theCompton 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 ofSkipper-CCDs to characterize the Compton spectrum and to measure precisely theFano factor and electron-hole pair creation energy below 150 eV.

Constraints on the electron-hole pair creation energy and Fano factor below 150 eV from Compton scattering in a Skipper-CCD