Exploring the sensitivity to non-standard neutrino interactions of NaI and cryogenic CsI detectors at the Spallation Neutron Source

After the first observation of coherent elastic neutrino-nucleus scattering (CEνNS) by the COHERENT
Collaboration, many efforts are being made to improve the measurement of this process, making it possible
to constrain new physics in the neutrino sector. In this paper, we study the sensitivity to non-standard
interactions (NSIs) and generalized neutrino interactions of two experimental setups at the Spallation
Neutron Source at Oak Ridge National Laboratory: a NaI detector with characteristics similar to the one
that is currently being deployed there and a cryogenic CsI detector proposed at the same facility. We show
that a combined analysis of the data from these detectors, whose target nuclei have significantly different
proton-to-neutron ratios, could help to partially break the parameter degeneracies arising from the
interference between the Standard Model and NSI contributions to the CEνNS cross section, as well as
between different NSI parameters. By contrast, only a slight improvement over the current CsI constraints
is expected for parameters that do not interfere with the SM contribution.