Abstract
We propose the use of isotopically highly enriched detectors for the precise study of coherent-elastic neutrino-nucleus scattering (CEvNS). CEvNS has been measured for the first time in CsI and recently confirmed with a liquid argon detector. It is expected that several new experimental setups will measure this process with increasing accuracy. Taking Ge detectors as a working example, we demonstrate that a combination of different isotopes is an excellent option to do precision neutrino physics with CEvNS, test Standard Model predictions, and probe new physics scenarios. Experiments based on this new idea can make simultaneous differential CEvNS measurements with detectors of different isotopic composition. Particular combination of observables could be used to cancel systematic errors. While many applications are possible, we illustrate the idea with three examples: testing the dominant quadratic dependence on the number of neutrons, $N$, that is predicted by the theoretical models; constraining the average neutron root mean square (rms) radius; and testing the weak mixing angle and the sensitivity to new physics. In all three cases we find that the extra sensitivity provided by this method will potentially allow high-precision robust measurements with CEvNS and particularly, will resolve the characteristic degeneracies appearing in new physics scenarios.
Highlights
Neutrinos in the energy region (1 MeV ≤ Eν ≤ 50 MeV) such as those generated in reactors or pion decay-at-rest sources (π-DAR), provide a new means of testing the Standard Model (SM) and its possible extensions
In summary we present a novel approach for precision measurements of CEvNS
Second order effects in the detectors attributed to differences in the isotopic composition of its constituents will have to be taken into consideration such as departures from 100% enrichment, differences in fiducial masses, differences of quenching factors and cosmogenic and neutron-induced backgrounds [44,45]
Summary
Taking Ge detectors as a working example, we demonstrate that a combination of different isotopes is an excellent option to do precision neutrino physics with CEvNS, test Standard Model predictions, and probe new physics scenarios. Experiments based on this new idea can make simultaneous differential CEvNS measurements with detectors of different isotopic composition. In all three cases we find that the extra sensitivity provided by this method will potentially allow high-precision robust measurements with CEvNS and will resolve the characteristic degeneracies appearing in new physics scenarios
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