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Coherent neutrino scattering and the Migdal effect on the quenching factor
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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' 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.
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Cited by 1 Pith paper
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Migdal Ionization as a Probe of Light Dark Matter from Nuclear Transition
Migdal ionization of reactor-produced sub-MeV dark matter in TEXONO germanium yields new 95% C.L. limits on the reference DM–proton cross section for 0.01 MeV ≤ mχ ≲ 2.6 MeV.
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