Date and Time: Friday, 17 November 2017, at 11:00 AM

Venue: Conference Hall, Dzhelepov Laboratory of Nuclear Problems

Seminar topic: «EDELWEISS-LT: Direct search for light WIMP with HPGe semiconductor bolometers»

Speaker: E.A. Yakushev (DLNP JINR)

Abstract:

The EDELWEISS program searches for direct evidence of Dark Matter WIMPs from the Milky Way galaxy through their scattering of Ge nuclei within HPGe crystals. EDELWEISS detectors are cryogenic (work temperature is below 20 mK) Ge bolometers. In the present time there is an increasing gain of interest for the search of low-mass WIMPs arising on the one hand from non evidence yet for SUSY at the LHC, on the other hand from new theoretical approaches favoring lighter candidates, and from controversial results of some other experiments. Thus main objective of the EDELWEISS is now shifted to the low-mass WIMPs region (10 GeV/c² and below) which could be investigated in the experiment thanks to advantage of 100 eV energy resolution reachable with HPGe bolometers via the Neganov-Luke effect of internal amplification of the heat signal. During new EDELWEISS-LT phase of the experiment measurements with several low threshold bolometers with internal amplification of the heat signal will be performed. That will target light WIMP – nucleon cross section on the level of better of 10^-41 cm² competitive with best results of other experiments.