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SUMMARY:New mK-temperature Germanium detectors for Dark Matter direct sear
 ch and for precision measurements of CEvNS
DTSTART;VALUE=DATE-TIME:20201009T110000Z
DTEND;VALUE=DATE-TIME:20201009T113000Z
DTSTAMP;VALUE=DATE-TIME:20261015T225534Z
UID:indico-contribution-2096@cern.ch
DESCRIPTION:Speakers: Evgeny Yakushev (JINR\, Dubna)\nIn direct searches f
 or Dark Matter (DM) a technology developing by EDELWEISS experiment is arr
 ays of Ge mono-crystal detectors operated at a temperature of few mK and e
 quipped with electrodes and thermal sensors. Applying a small (few V/cm) e
 xternal field\, a simultaneous measurement of ionization and heat signals 
 allows efficient identification of nuclear and electron recoils. A larger 
 bias leads to a so-called Neganov-Trofimov-Luke internal amplification of 
 the phonon signal\, lowering the effective threshold and thus opening a se
 arch at the low energy region not accessible by huge Ar/Xe base detectors.
  \n\nIn 2020 an unprecedented charge resolution of 0.53 electron-hole pair
 s (RMS) has been achieved using the Neganov-Trofimov-Luke internal amplifi
 cation in the EDELWEISS experiment operated at the LSM deep underground si
 te (France). Thanks to this\, the first Ge-based constraints on sub-MeV DM
  particles interacting with electrons\, as well as on dark photons down to
  1 eV have been set. These results demonstrated the high relevance of cryo
 genic Ge detectors for the search of DM interactions producing eV-scale si
 gnals. The region of "light WIMPs" will be further investigated in the EDE
 LWEISS experiment thanks to advantage of energy resolution below 20 eV rea
 chable with new array of HPGe bolometers. This stage is in the R&D phase\,
  building of improved detectors\, their holders and supports\, improvement
  of the background and acquisition. \n\nThe unlimited target of current R&
 D and measurements in the EDELWEISS experiment is achievement of sensitivi
 ty allowing detection of B-8 solar neutrinos through coherent elastic neut
 rino-nucleus scattering (CEvNS). The same technology and detectors will be
  applied for precision measurements of CEvNS in the region of full coheren
 cy in the Ricochet experiment (reactor neutrinos). Due to direct energy re
 construction (heat signal) the main uncertainty arising due to not well kn
 own quenching in germanium will be avoided. 1 kg of new cryogenic detector
 s (developing thanks to joint R&D of EDELWEISS and Ricochet teams) will be
  integrated in the Ricochet cryostat. The Ricochet is going to be deployed
  at ILL (Grenoble\, France) site\, on a distance at about 8 m from the 58M
 W nuclear reactor\, with first results expected to 2025. In addition to th
 e main goal: precise (1% level) study of CEvNS the experiment will target 
 NMM and other New physics phenomena. Possibility of further phases of the 
 experiment at a Nuclear power plant (a 3.1GW reactor) at Russia is investi
 gated.\n\nhttps://indico.particle.mephi.ru/event/35/contributions/2096/
LOCATION:Zoom Plenary
URL:https://indico.particle.mephi.ru/event/35/contributions/2096/
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