A new high-background-rejection dark matter Ge cryogenic detector

A. Broniatowski (1) , X. Defay (1) , E. Armengaud (2) , L. Berge (1) , Alain Benoit (3) , O. Besida (2) , J. Blumer (4, 5) , A. Chantelauze (5) , M. Chapellier (1) , G. Chardin (1) , F. Charlieux (6) , S. Collin (1) , O. Crauste (1) , M. de Jesus (6) , P. Di Stefano (6) , Y. Dolgorouki (1) , J. Domange (1) , L. Dumoulin (1) , K. Eitel (5) , J. Gascon (6) , G. Gerbier (2) , M. Gros (2) , M. Hannawald (2) , S. Herve (2) , A. Juillard (1, 6) , H. Kluck (5) , V. Kozlov (5) , R. Lemrani (2) , A. Lubashevskiy (7) , C. Marrache (1) , S. Marnieros (1) , X.-F. Navick (2) , C. Nones (1) , E. Olivieri (1) , P. Pari (8) , B. Paul (2) , S. Rozov (7) , V. Sanglard (6) , S. Scorza (6) , S. Semikh (7) , M.-A. Verdier (6) , L. Vagneron (6) , E. Yakushev (7)

1 CSNSM - Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse
2 IRFU - Institut de Recherches sur les lois Fondamentales de l'Univers
3 NEEL - HELFA - Hélium : du fondamental aux applications
4 TH - University of Karlsruhe
5 Institut fur Kernphysik - Institut fur Kernphysik
6 IPNL - Institut de Physique Nucléaire de Lyon
7 DLNP - Dzhelepov Laboratory of Nuclear Problems [Dubna]
8 IRAMIS - Institut Rayonnement Matière de Saclay (DRF)

A new design of a cryogenic germanium detector for dark matter search is presented, taking advantage of the coplanar grid technique of event localisation for improved background discrimination. Experiments performed with prototype devices in the EDELWEISS II setup at the Modane underground facility demonstrate the remarkably high efficiency of these devices for the rejection of low-energy $\beta$, approaching 10$^5$ . This opens the road to investigate the range beyond 10$^{-8}$ pb in the WIMP-nucleon collision cross-sections, as proposed in the EURECA project of a one-ton cryogenic detector mass.

Domaines: Instrumentation et méthodes pour l'astrophysique [astro-ph.IM]; Instrumentation et méthodes pour l'astrophysique [astro-ph.IM]

A. Broniatowski, X. Defay, E. Armengaud, L. Berge, Alain Benoit, et al.. A new high-background-rejection dark matter Ge cryogenic detector. Physics Letters B, 2009, 681, pp.305-309. ⟨10.1016/j.physletb.2009.10.036⟩. ⟨in2p3-00381573⟩