TY  - JOUR
PB  - SciPost Foundation
DO  - 10.21468/SciPostPhysProc.12.015
TI  - Measurement of low-energy Compton and neutron scattering in Si CCDs for dark matter searches
PY  - 2023/07/03
UR  - https://scipost.org/SciPostPhysProc.12.015
JF  - SciPost Physics Proceedings
JA  - SciPost Phys. Proc.
VL  - 
IS  - 12
SP  - 015
A1  - Smida, Radomir
AB  - For optimal sensitivity to low-mass dark matter candidates experiments like DAMIC-M employ skipper charged-coupled devices (CCDs) with detection threshold of just a few ionization charges. Ionization signals from small-angle Compton scatters of environmental $\gamma$-rays, an important component of the background in dark matter searches, must thus be characterized down to $O$(10 eV) energy. Using a $^{241}$Am $\gamma$-ray source, we report a precise measurement of scattering on Si atomic shell electrons in a skipper CCD with single-electron resolution. Notable differences are observed between data and theoretical expectations in the L-shell energy region ($<$150 eV). We also present preliminary data from a skipper CCD exposed to low-energy neutrons ($<$24 keV) from a $^{124}$Sb$^9$Be photoneutron source, demonstrating a measurement of the nuclear recoil ionization efficiency in Si down to few ionization charges.
ER  -

@Article{10.21468/SciPostPhysProc.12.015,
	title={{Measurement of low-energy Compton and neutron scattering in Si CCDs for dark matter searches}},
	author={Radomir Smida for the DAMIC-M Collaboration},
	journal={SciPost Phys. Proc.},
	pages={015},
	year={2023},
	publisher={SciPost},
	doi={10.21468/SciPostPhysProc.12.015},
	url={https://scipost.org/10.21468/SciPostPhysProc.12.015},
}