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arXiv · 1907.04828

Response of CsI[Na] to Nuclear Recoils: Impact on Coherent Elastic Neutrino-Nucleus Scattering (CE$ν$NS)

J. I. Collar·A. R. L. Kavner·C. M. Lewis
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Abstract

A new measurement of the quenching factor for low-energy nuclear recoils in CsI[Na] is presented. Past measurements are revisited, identifying and correcting several systematic effects. The resulting global data are well-described by a physics-based model for the generation of scintillation by ions in this material, in agreement with phenomenological considerations. The uncertainty in the new model is reduced by a factor of four with respect to an energy-independent quenching factor initially adopted as a compromise by the COHERENT collaboration. A significantly improved agreement with Standard Model predictions for the first measurement of CE$ν$NS is generated. We emphasize the critical impact of the quenching factor on the search for new physics via CE$ν$NS experiments.

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J. I. Collar, A. R. L. Kavner, C. M. Lewis. 2019-07-13. Response of CsI[Na] to Nuclear Recoils: Impact on Coherent Elastic Neutrino-Nucleus Scattering (CE$ν$NS). https://doi.org/10.1103/physrevd.100.033003

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