Speaker
Description
On the various astrophysical and cosmological scales there is compelling evidence for the existence of dark matter beyond the constituents of our Standard Model of particle physics. WIMPs are among the favored candidates which would solve also other problems of the Standard Model. The DARWIN Collaboration and/or the XLZD Consortium plan a next generation xenon detector with 40t (or up to 80t) of active mass to probe WIMPs down to the region of the neutrino fog, where the background is governed by coherent elastic neutrino nucleus scattering (CEvNS) of solar and atmospheric neutrinos. The DARWIN/XLZD detector will be an observatory with a brought physics program including solar neutrinos, solar axions, ALPs and neutrinoless double beta decay.
DARWIN/XLZD requires again another order of magnitude in reducing the background rate compared to the current set of experiments (LZ, PandaX-4T, XENONnT). In addition to going underground, muon and neutron vetos, careful material screening and selection, the reduction of radioactive noble gases as Kr-85 and Rn-222 is of very high importance. Within the ERC Advanced Grant project "LowRad" the technology is being developed to reduce these backgrounds in DARWIN/XLZD to 10% of the rate induced by unshieldable solar neutrinos.
The author is supported by the ERC AdG project "Lowrad" (101055063)
