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Measurement of low-energy Compton and neutron scattering in Si CCDs for dark matter searches
by R. Smida for the DAMIC-M Collaboration
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Submission summary
| Authors (as registered SciPost users): | Radomir Smida |
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| Preprint Link: | scipost_202210_00025v1 (pdf) |
| Date accepted: | March 9, 2023 |
| Date submitted: | Oct. 3, 2022, 4:19 p.m. |
| Submitted by: | Smida, Radomir |
| Submitted to: | SciPost Physics Proceedings |
| Proceedings issue: | 14th International Conference on Identification of Dark Matter (IDM2022) |
| Ontological classification | |
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| Academic field: | Physics |
| Specialties: |
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| Approach: | Experimental |
Abstract
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(10eV) energy. Using a 241Am 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 (<24keV) from a 124Sb9Be photoneutron source, demonstrating a measurement of the nuclear recoil ionization efficiency in Si down to few ionization charges.
Published as SciPost Phys. Proc. 12, 015 (2023)
Reports on this Submission
Report #1 by Anonymous (Referee 1) on 2022-11-8 (Invited Report)
- Cite as: Anonymous, Report on arXiv:scipost_202210_00025v1, delivered 2022-11-08, doi: 10.21468/SciPost.Report.6088