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SIMPLE
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SIMPLE (Superheated
Instrument
for Massive
ParticLe Experiments)
is a detector designed to search for evidence of galactic dark matter in the
form of Weakly Interacting Massive Particles (WIMPs) using superheated freon
droplets suspended in a gel matrix. The detector (SDD) operation is based on
the irradiation-induced phase transition of a superheated liquid (droplet) to
the gas (bubble) phase. Bubble nucleation occurs if the deposited energy is
greater than ~200 keV/micron, making the SDD insensitive to numerous
backgrounds associated with the more traditional detectors of dark matter
searches. Such detectors have been
explored for decades as dosimeters, in which the concentration of freon is ~
0.03 g per liter. The SIMPLE device, in contrast, contains over 10 g of active
freon mass per liter.
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