Burying the experiment under over 1km of solid rock is not sufficient in order to reduce the particle background to a level that allows BULLKID-DM to conduct its search for WIMP-like Dark Matter. Our simulations show that it is necessary to further reduce the impact of the radioactive sources that are naturally present inside the LNGS experimental Hall due to the composition of its rocky walls. In order to do that two main shields have been envisioned: one at room temperature that encloses the cryostat and one at cryogenic temperature.
The inner veto consists of over 250 kg of copper, including 70 kg of copper of extreme radio-purity. Furthermore, the shield consists of a boron-carbide layer to further slow down the radiogenic neutrons and an anti-coincidence (veto) detector.
