Coherent neutrino scattering and the Migdal effect on the quenching factor
Jiajun Liao, Hongkai Liu, Danny Marfatia
Abstract
Recent measurements of the germanium quenching factor deviate significantly from the predictions of the standard Lindhard model for nuclear recoil energies below a keV. This departure may be explained by the Migdal effect in neutron scattering on germanium. We show that the Migdal effect on the quenching factor can mimic the signal of a light ${Z}^{\ensuremath{'}}$ or light scalar mediator in coherent elastic neutrino-nucleus scattering experiments with reactor antineutrinos. It is imperative that the quenching factor of nuclei with low recoil energy thresholds be precisely measured close to threshold to avoid such confusion. This will also help in experimental searches of light dark matter.
Topics & Concepts
PhysicsRecoilNuclear physicsQuenching (fluorescence)GermaniumScatteringNeutrinoNeutronScalar (mathematics)Atomic physicsParticle physicsOpticsSiliconFluorescenceOptoelectronicsMathematicsGeometryDark Matter and Cosmic PhenomenaNeutrino Physics ResearchAtomic and Subatomic Physics Research