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Direct Detection of Spin-Dependent Sub-GeV Dark Matter via Migdal Effect
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Direct Detection of Spin-Dependent Sub-GeV Dark Matter via Migdal Effect
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Motivated by the current strong constraints on the spin-independent dark matter (DM)-nucleus scattering, we investigate the spin-dependent (SD) interactions of the light Majorana DM with the nucleus mediated by an axial-vector boson. Due to the small nucleus recoil energy, the ionization signals have now been used to probe the light dark matter particles in direct detection experiments. With the existing ionization data, we derive the exclusion limits on the SD DM-nucleus scattering through Migdal effect in the MeV-GeV DM mass range. It is found that the lower limit of the DM mass can reach about several MeVs. Due to the momentum transfer correction induced by the light mediator, the bounds on the SD DM-nucleus scattering cross sections can be weakened in comparison with the heavy mediator.
Forward citations
Cited by 3 Pith papers
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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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Migdal Ionization as a Probe of Light Dark Matter from Nuclear Transition
Migdal ionization in a germanium detector can turn reactor-produced sub-MeV dark matter into observable signals, yielding new 95% C.L. limits on the DM–proton cross section for masses 0.01–2.6 MeV.
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Irreducible Constraints on Hadronically Interacting Sub-GeV Dark Matter
Sub-GeV dark matter that interacts hadronically is ruled out for nucleon scattering cross sections above 10^{-36} cm² across the keV to 100 MeV mass range by combined cosmological and particle-decay constraints.
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