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Measurement of scintillation response of CsI[Na] to low-energy nuclear recoils by COHERENT

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arxiv 2111.02477 v2 pith:GK3UABBN submitted 2021-11-03 physics.ins-det

Measurement of scintillation response of CsI[Na] to low-energy nuclear recoils by COHERENT

classification physics.ins-det
keywords coherentresponseresultscevnseffectselasticmeasurementmeasurements
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We present results of several measurements of CsI[Na] scintillation response to 3-60 keV energy nuclear recoils performed by the COHERENT collaboration using tagged neutron elastic scattering experiments and an endpoint technique. Earlier results, used to estimate the coherent elastic neutrino-nucleus scattering (CEvNS) event rate for the first observation of this process achieved by COHERENT at the Spallation Neutron Source (SNS), have been reassessed. We discuss corrections for the identified systematic effects and update the respective uncertainty values. The impact of updated results on future precision tests of CEvNS is estimated. We scrutinize potential systematic effects that could affect each measurement. In particular we confirm the response of the H11934-200 Hamamatsu photomultiplier tube (PMT) used for the measurements presented in this study to be linear in the relevant signal scale region.

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