Speaker
Description
We demonstrate the differences, with and without directionality information from knockout neutrons, on the sensitivities of Jiangmen Underground Neutrino Observatory JUNO on dark matter (DM) direct detection. Sub-GeV DM can be boosted by cosmic rays to leave a detectable signal in liquid scintillator detectors. These boosted dark matter (BDM) are dominated around the galactic center due to DM density profile. As BDM undergoes quasi-elastic scattering with carbon and knocks out a neutron, we show, using Geant4, that these neutrons retain partial directional information of the initial BDM after diffusion. For directional information, we targeted two interaction vertices involve tracing a gamma ray from nuclear de-excitation, together with a time-delayed gamma ray from neutron capture. At last, we conclude the directionality information mildly improves the spin-independent DM–nucleon scattering cross-section constraint because the BDM-induced neutron sky map lacks contrast.
