Underground Facilities in Korea for Astro-particle Physics

Cosmic rays and their induced daughter particles are one of major backgrounds in searches for rare signals such as those from neutrinoless double beta decay (0) and dark matter (DM). In an above-ground laboratory, the background rates due to cosmic rays are much higher than they are in an underground laboratory. Obtaining a rare signal from 0 or DM is almost impossible with an above-ground experiment. Therefore, we must run our experiments searching for 0 and DM in an underground laboratory where cosmic-ray backgrounds are greatly reduced. In this article, we present our plan for a new underground laboratory that is deeper than the current one and for the facilities there.