Abstract
AMoRE (Advanced Mo-based Rare process Experiment) is searching for neutrinoless double beta decay of 100Mo. A pilot experiment, AMoRE-Pilot, was operated with six 48dep1Ca100MoO4 crystals of total mass ~1.9 kg in a cryostat at the Yangyang underground laboratory (Y2L) with the minimum overburden of 700 m. Since AMoRE-Pilot started in August 2015, two major improvements in its configuration took place to reduce its background level. The first one was replacement of detector components by materials with lower radioactivity level. The second one was the installation polyethylene blocks together with borated rubber sheets to reduce external neutron backgrounds. Using the AMoRE-Pilot data in different configurations, background modelling of the AMoRE-Pilot was performed.
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