Radioassay and simulation for AMoRE-II experiment

AMoRE is an underground experiment searching for the neutrinoless double beta decay of 100Mo using cryogenic detectors based on molybdate crystal scintillators enriched in 100Mo. The next phase experiment with ~180 kg of Li2100MoO4crystals, AMoRE-II, is in preparation at the Yemi underground laboratory located at the Handuk iron mine in Jeongseon (Korea). In order to achieve the background level of 10−4 events/keV/kg/year, the materials of the set-up should be carefully selected on the radioactive contamination level. The materials for the shielding and the components of the detector tower have been measured using ICP-MS and HPGe gamma-spectrometry precisely. The results fed into Geant4 Toolkit to estimate the background conditions in AMoRE-II. We will present the radioassay results, background simulations, and estimated background levels in the AMoRE-II.