  We report on the first results of the MACHe3 (MAtrix of Cells of Helium 3)
prototype experiment concerning the measurement of low energy conversion
electrons at ultra-low temperature. For the first time, the feasibility of the
detection of low energy electrons is demonstrated in superfluid He3-B cooled
down to 100 microK. Low energy electrons at 7.3 keV coming from the K shell
conversion of the 14.4 keV nuclear transition of a low activity Co57 source are
detected, opening the possibility to use a He3-based detector for the detection
of Weakly Interacting Massive Particles (WIMPs) which are expected to release
an amount of energy higher-bounded by 5.6 keV.
