  We consider the use of directionality in the search for monoenergetic sub-GeV
neutrinos arising from the decay of stopped kaons, which can be produced by
dark matter annihilation in the core of the Sun. When these neutrinos undergo
charged-current interactions with a nucleus at a neutrino detector, they often
eject a proton which is highly peaked in the forward direction. The direction
of this track can be measured at DUNE, allowing one to distinguish signal from
background by comparing on-source and off-source event rates. We find that
directional information can enhance the signal to background ratio by up to a
factor of 5.
