تقرير
Precision measurement of Compton scattering in silicon with a skipper CCD for dark matter detection
| العنوان: | Precision measurement of Compton scattering in silicon with a skipper CCD for dark matter detection |
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| المؤلفون: | Norcini, D., Castello-Mor, N., Baxter, D., Corso, N. J., Cuevas-Zepeda, J., De Dominicis, C., Matalon, A., Munagavalasa, S., Paul, S., Privitera, P., Ramanathan, K., Smida, R., Thomas, R., Yajur, R., Chavarria, A. E., McGuire, K., Mitra, P., Piers, A., Settimo, M., Gutierrez, J. Cortabitarte, Duarte-Campderros, J., Lantero-Barreda, A., Lopez-Virto, A., Vila, I., Vilar, R., Avalos, N., Bertou, X., Dastgheibi-Fard, A., Deligny, O., Estrada, E., Gadloa, N., Gaior, R., Hossbach, T., Khalil, L., Kilminster, B., Lawson, I., Lee, S., Letessier-Selvon, A., Loaiza, P., Papadopoulos, G., Robmann, P., Traina, M., Warot, G., Zopounidis, J-P. |
| المصدر: | 3 November 2022 |
| سنة النشر: | 2022 |
| المجموعة: | Astrophysics High Energy Physics - Experiment Physics (Other) |
| مصطلحات موضوعية: | Physics - Instrumentation and Detectors, Astrophysics - Instrumentation and Methods for Astrophysics, High Energy Physics - Experiment |
| الوصف: | Experiments aiming to directly detect dark matter through particle recoils can achieve energy thresholds of $\mathcal{O}(1\,\mathrm{eV})$. In this regime, ionization signals from small-angle Compton scatters of environmental $\gamma$-rays constitute a significant background. Monte Carlo simulations used to build background models have not been experimentally validated at these low energies. We report a precision measurement of Compton scattering on silicon atomic shell electrons down to 23$\,$eV. A skipper charge-coupled device (CCD) with single-electron resolution, developed for the DAMIC-M experiment, was exposed to a $^{241}$Am $\gamma$-ray source over several months. Features associated with the silicon K, L$_{1}$, and L$_{2,3}$-shells are clearly identified, and scattering on valence electrons is detected for the first time below 100$\,$eV. We find that the relativistic impulse approximation for Compton scattering, which is implemented in Monte Carlo simulations commonly used by direct detection experiments, does not reproduce the measured spectrum below 0.5$\,$keV. The data are in better agreement with $ab$ $initio$ calculations originally developed for X-ray absorption spectroscopy. Comment: 12 pages, 10 figures |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1103/PhysRevD.106.092001 |
| الوصول الحر: | http://arxiv.org/abs/2207.00809Test |
| رقم الانضمام: | edsarx.2207.00809 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1103/PhysRevD.106.092001 |
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