Скачать или смотреть Patras 2022 - 13 - Vanessa Zema - COSINUS and NaI-based Dark Matter Experiments

Dr. Vanessa Zema from the Max Planck Institute for Physics, Munich, talks about "COSINUS and NaI-based Dark Matter Experiments" at the 17th Patras Workshop on Axions, WIMPs and WISPs.

The Patras Workshop took place at the Johannes Gutenberg University of Mainz as the second week of events within the Wavy Dark Matter Summer event series in August 2022. www.wavydarkmatter.org

Abstract:
COSINUS (Cryogenic Observatory for SIgnatures seen in Nextgeneration
Underground Searches) is a dark matter direct detection
experiments investigating the nature of the annual modulation signal
de- tected by the DAMA/LIBRA collaboration. A two-channel
readout differentiates COSINUS from the other dark matter experiments
using NaI-crystals: in addition to the scintillation light
(measured with silicon light detectors), COSINUS can measure
the heat released in the target after a particle interaction. The NaIcrystals
are operated as cryogenic calorimeters and both the crystals
and the silicon light detec- tors are equipped with Transition Edge
Sensors (TES). The ratio between the amount of light and heat
measured in the two channels is used to discriminate e-/γ-events
from nuclear recoils on an event-by- event basis, thus it can provide
further information on the nature of the DAMA/LIBRA signal.
COSINUS has overcome the challenge of a low-melting-point and
hygroscopic crystal by developing and successfully operating a new
TES coupling named remoTES. It consists of a TES fabricated
on a separated wafer and coupled to the NaI-absorber through a
gold bonding wire and a gold foil glued on the NaI-surface. The
required performance to cross-check the DAMA/LIBRA’s results
is now within COSINUS’s reach. The construction of the facility
hosting the new cryogenic observatory at the Gran Sasso National
Laboratory (Italy) is progressing fast and planned to be complete
by the end of 2023. In this talk, we provide a short overview of
the state-of-the-art of the searches for the dark-matter-rate-annualmodulation
and we describe the COSINUS detector design and
optimisation, the current status of the facility and future plans.