Precision measurement of Compton scattering in silicon with a skipper CCD for dark matter detection

Autor: Norcini, D., Castello-Mor, N., Baxter, D., Corso, N. J., Cuevas-Zepeda, J., 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., Cortabitarte Gutierrez, J., 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., antoine letessier selvon, Loaiza, P., Papadopoulos, G., Robmann, P., Traina, M., Warot, G., J-P, Zopounidis
Přispěvatelé: Universidad de Cantabria, European Commission, European Research Council, National Science Foundation (US), Kavli Foundation, Ministerio de Ciencia, Innovación y Universidades (España), Agencia Estatal de Investigación (España), Kavli Institute for Particle Astrophysics and Cosmology, Agencia Nacional de Promoción Científica y Tecnológica (Argentina), Swiss National Science Foundation, Department of Energy (US), HEP, INSPIRE
Jazyk: angličtina
Rok vydání: 2022
Předmět:
Zdroj: Physical Review D, 2022, 106, 092001
HAL
Popis: DAMIC-M Collaboration: et al.
Experiments aiming to directly detect dark matter through particle recoils can achieve energy thresholds of O(10 eV). In this regime, ionization signals from small-angle Compton scatters of environmental γ 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 with single-electron resolution, developed for the DAMIC-M experiment, was exposed to a 241Am γ-ray source over several months. Features associated with the silicon K-, L1-, and L2,3-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.
The DAMIC-M project has received funding from the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme Grant Agreement No. 788137, and from NSF through Grant No. NSF PHY-1812654. The work at University of Chicago and University of Washington was supported through Grant No. NSF PHY-2110585. This work was supported by the Kavli Institute for Cosmological Physics at the University of Chicago through an endowment from the Kavli Foundation. We also thank the College of Arts and Sciences at UW for contributing the first CCDs to the DAMIC-M project. I.F.C.A. was supported by project PID2019–109829 GB-I00 funded by MCIN/ AEI /10.13039/501100011033. The Centro Atómico Bariloche group is supported by ANPCyT Grant No. PICT-201803069. The University of Zürich was supported by the Swiss National Science Foundation. The CCD development work at Lawrence Berkeley National Laboratory Microsystems Lab was supported in part by the Director, Office of Science, of the U.S. Department of Energy under Award No. DE-AC02-05CH11231.
Databáze: OpenAIRE
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