Electron - nuclear recoil discrimination by pulse shape analysis

Details Electron - nuclear recoil discrimination by pulse shape analysis Electron - nuclear recoil discrimination by pulse shape analysis

2007-10-18

arxiv.org/abs/0710.3441v1

Physics

Instrumentation and Detectors

Proseedings of QFS 2007, Kazan, Russia; 8 pages, 4 figures. Submited to J. Low Temp. Phys

Scientific paper

10.1007/s10909-007-9603-7

In the framework of the ``ULTIMA'' project, we use ultra cold 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 thermalization time constant. Until now it was believed that this parameter only depends 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 event discrimination in a future dark matter detector will be discussed.

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