EXCESS22@IDM

Session

Session Block 2

Jul 16, 2022, 1:30 PM

Technical University Vienna

Conveners

Session Block 2: Afternoon talks

• Alexander Fuss

13. Latest results on the low energy excess in CRESST-III

Dominik Raphael Fuchs (Max Planck Society (DE))

7/16/22, 1:30 PM

CRESST, similarly to many other experiments, observes an unexpected excess of events at low
energies. So far no conclusive explanation of its origin was found. The current CRESST-III data
taking campaign is dedicated to study and possibly identify the nature of this Low Energy Excess
(LEE). We are operating a variety of detector modules differing in target materials, geometries and
holding...

9. Heat-only background in the EDELWEISS detectors with NbSi TES sensor

Dr Hugues LATTAUD

7/16/22, 1:55 PM

The EDELWEISS collaboration has extensively studied the population of events with no ionization signal ("Heat-Only" events) in its cryogenic germanium detector equipped with Ge-NTD sensors. It recently developed and operated in an low-radioactivity underground environment a new generation of cryogenic germanium detectors equipped with NbSi thin-film sensors able to detect out-of-equilibirum...

19. Stress Induced Background in Cryogenic Crystal Calorimeters

Daniel Mckinsey

7/16/22, 2:20 PM

A number of low mass dark matter direct detection experiments have observed an excess rate of events, rising sharply below energies of around 100 eV. A similar source of background energy has been observed to shorten the coherence time of superconducting quantum bits by creating excess quasiparticles in the qubit circuit. The relaxation of stress in detector materials has been shown to cause...

12. Low energy excess in MAGNETO R&D Data

Geon-Bo Kim

7/16/22, 2:45 PM

MAGNETO is developing dark matter and neutrino detectors using magnetic quantum sensors with sub-microsecond timing resolution for phonon pulse shape discrimination in eV region. Such fast timing resolution improves separation of electron recoil background, microphonic noise, and thermal noises due to events from substrates and surrounding materials. I will discuss findings from MAGNETO R&D...

6. Dark matter detectors and understanding of glasses

sergey pereverzev (LLNL)

7/16/22, 2:50 PM

Interest in detecting coherent elastic scattering of low-energy neutrinos, dark matter particles and physics beyond the standard model brings numerous experiments involving low-temperature solid-state Detectors. The excess low-energy background was found in numerous experiments, with a wide range of detector mass, and using various readout channels: luminescence, conductivity, temperature, or...

5. Energy loss due to defect creation in solid state detectors

Matti Heikinheimo (University of Helsinki and Helsinki Institute of Physics)

7/16/22, 3:40 PM

The threshold displacement energy in solid state detector materials varies from several eV to ~100 eV. If a stable or long lived defect is created as a result of a nuclear recoil event, some part of the recoil energy is stored in the deformed lattice and is therefore not observable in a phonon detector. Thus, an accurate model of this effect is necessary for precise calibration of the recoil...

18. Impact of crystal lattice defect quenching on coherent neutrino scattering experiments

thierry lasserre

7/16/22, 4:05 PM

Future experiments on coherent neutrino scattering near nuclear reactors using cryogenic solid-state phonon-mediated detectors have their global signal for the energy transferred to the target nucleus in the range of a few tens to a hundred electron volts. In this range, the creation of permanent or long-lived crystal defects can have a significant effect on the reconstruction of the true...