We discuss prospects for probing $Z$-prime and nonstandard neutrino interactions using neutrino-nucleus coherent scattering with ultralow energy ($\sim 10\mathrm{eV}$) threshold Si and Ge detectors. The analysis is performed in the context of a specific and contemporary reactor-based experimental proposal, developed in cooperation with the Nuclear Science Center at Texas A&M University, and referencing available technology based upon economical and scalable detector arrays. For expected exposures, we show that sensitivity to the $Z$-prime mass is on the order of several TeV and is complementary to the LHC search with low-mass detectors in the near term. This technology is also shown to provide sensitivity to the neutrino magnetic moment, at a level that surpasses terrestrial limits, and is competitive with more stringent astrophysical bounds. We demonstrate the benefits of combining silicon and germanium detectors for distinguishing between classes of models of new physics and for suppressing correlated systematic uncertainties.

• Received 28 September 2015

DOI:https://doi.org/10.1103/PhysRevD.93.013015