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

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

2005-04-12

arxiv.org/abs/astro-ph/0504272v1

Nucl.Instrum.Meth.A548:411-417,2005

Astronomy and Astrophysics

Astrophysics

8 pages, 3 figures, to appear in NIMA

Scientific paper

10.1016/j.nima.2005.04.060

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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