A two-component dark photon model with a heavier dark matter annihilating into MeV-scale boosted dark matter could produce a few to hundreds of nuclear recoil events per year in NEWSdm nuclear emulsion, with a Galactic-center directional signature.
The development of super fine-grained nuclear emulsion
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abstract
A nuclear emulsion with micronized crystals is required for the tracking detection of submicron ionizing particles, which are a target of dark matter detection and other methods. We found that a new production method, named as the PVA-Gelatin Mixing Method (PGMM), could effectively control crystal size from 20 nm to 50 nm. We named two types of an emulsion produced with the new method NIT and UNIT. The composition and spatial resolution of them were measured, and the results indicated that these emulsions detect extremely short tracks.
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Directional Direct Detection of MeV Scale Boosted Dark Matter in Two Component Dark Matter Scenario via Dark Photon Interaction
A two-component dark photon model with a heavier dark matter annihilating into MeV-scale boosted dark matter could produce a few to hundreds of nuclear recoil events per year in NEWSdm nuclear emulsion, with a Galactic-center directional signature.