1,207 research outputs found
Sub-GeV Dark Matter Searches with EDELWEISS: New results and prospects
No full textInternational audienceThe Edelweiss collaboration performs light Dark Matter (DM) particles searches with germanium bolometer collecting charge and phonon signals. Thanks to the Neganov-Trofimov-Luke (NTL) effect, a RMS resolution of 4.46 electron-hole pairs was obtained on a massive (200g) germanium detector instrumented with a NbSi Transition Edge Sensor (TES) operated underground at the Laboratoire Souterrain de Modane (LSM). This sensitivity made possible a search for WIMP using the Migdal effect down to 32 MeV/C and exclude cross-sections down to 10 cm. It is the first measurement in cryogenic germanium with such thermal sensor, proving the high relevance of this technology. Furthermore, such TES have shown sensitivity to out-of-equilibrium phonons, paving the way for EDELWEISS new experience CRYOSEL. This is an important step in the development of Ge detectors with improved performance in the context of the EDELWEISS-SubGeV program
Heat-only background in the EDELWEISS detectors with NbSi TES sensor
No full textInternational audienc
Sub-GeV dark matter searches beyond EDELWEISS:CRYOSEL and Ricochet developments
No full textInternational audienc
Sub-GeV dark matter searches beyond EDELWEISS:CRYOSEL and Ricochet developments
No full textInternational audienc
Sub-GeV dark matter searches beyond EDELWEISS:CRYOSEL and Ricochet developments
No full textInternational audienc
Activity of glycolytic enzymes in the gut of Hormogaster elisae (Oligochaeta, Hormogastridae)
No full textThe glycolytic enzymatic activities in the gut of the endogeic earthworm #Hormogaster elisae from El Molar (Madrid, Spain) were studied in order to determine its digestive capacity and to assess its alimentary regime. Most endogeic earthworms have weak enzymatic complement and they usually establish mutualistic relationships with soil microflora to digest some organic compounds. Therefore, the intestinal wall tissues were cultured in vitro to assess the origin of the glycolytic enzymes found in the gut and enzymatic activities were measured in both cultured tissues and culture media. #H. elisae had a wide but not very strong enzyme complement, since all substrates were degraded but most of them at a low rate. This species cannot produce cellulase and mannamase, so for the digestion of these substrates it probably uses the digestive enzymatic capabilities of the ingested microflora. (Résumé d'auteur
Activity of glycolytic enzymes in the gut of Hormogaster elisae (Oligochaeta, Hormogastridae)
No full textThe glycolytic enzymatic activities in the gut of the endogeic earthworm #Hormogaster elisae from El Molar (Madrid, Spain) were studied in order to determine its digestive capacity and to assess its alimentary regime. Most endogeic earthworms have weak enzymatic complement and they usually establish mutualistic relationships with soil microflora to digest some organic compounds. Therefore, the intestinal wall tissues were cultured in vitro to assess the origin of the glycolytic enzymes found in the gut and enzymatic activities were measured in both cultured tissues and culture media. #H. elisae had a wide but not very strong enzyme complement, since all substrates were degraded but most of them at a low rate. This species cannot produce cellulase and mannamase, so for the digestion of these substrates it probably uses the digestive enzymatic capabilities of the ingested microflora. (Résumé d'auteur
Characterization of the phonon sensor of the CRYOSEL detector with IR photons
No full textInternational audienceThe sensitivities of light Dark Matter (DM) particle searches with cryogenic detectors are mostly limited by large backgrounds of events that do not produce ionization signal. The CRYOSEL project develops a new technique where this background in a germanium cryogenic detector is rejected by using the signals from a Superconducting Single Electron Device (SSED) sensor designed to detect the phonons emitted through the Neganov-Trofimov-Luke effect by the eh pairs as they drift in a close-by very high-field region. A tag on signals from this device should suppress the heat-only background. The measurement of the response to IR laser pulses of the first CRYOSEL prototype show the relevance of such sensor technology
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