Electron-nuclear recoil discrimination by pulse shape analysis

Johannes Elbs (1) , Yuriy M. Bunkov (1) , Eddy Collin (1) , Henri Godfrin (1) , Olga Suvorova (2)

1 NEEL - UBT - Ultra-basses températures
2 RAS - Institute for Nuclear Research

In the framework of the "ULTIMA" project, we use superfluid 3He bolometers for the direct detection of single particle events, aimed for a future use as a dark matter detector. One parameter of the pulse shape observed after such an event is the thermalisation time constant tb. Until now it was believed that this parameter only dépends on geometrical factors and superfluid 3He properties, and that it is independent of the nature of the incident particles. In this report we show new results which demonstrate that a difference for muon- and neutron events, as well as events simulated by heater pulses exist. The possibility to use this difference for false event discrimination in a future dark matter detector will bediscussed.

Mots clés: bolometry; dimers; superfluid 3He

Domaines: Electrons fortement corrélés [cond-mat.str-el]

Johannes Elbs, Yuriy M. Bunkov, Eddy Collin, Henri Godfrin, Olga Suvorova. Electron-nuclear recoil discrimination by pulse shape analysis. Journal of Low Temperature Physics, 2008, 150 (3-4), pp.536. ⟨10.1007/s10909-007-9603-7⟩. ⟨hal-00921429⟩