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Low energy conversion electron detection in superfluid He3 at ultra-low temperature

E. Moulin·C. Winkelmann·J. F. Macias-Perez·Yu. M. Bunkov·H. Godfrin·D. Santos
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Abstract

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.

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E. Moulin, C. Winkelmann, J. F. Macias-Perez, Yu. M. Bunkov, H. Godfrin, D. Santos. 2005-04-12. Low energy conversion electron detection in superfluid He3 at ultra-low temperature. https://doi.org/10.1016/j.nima.2005.04.060

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