COUPP uses bubble chambers filled with CF3I to search for spin-dependent WIMP-proton and spin-independent WIMP-nucleon interactions. The target material is in a mild superheated state and rendered insensitive to electromagnetic interactions by a suitable choice of the pressure and temperature. Particles crossing the CF3I can interact with nuclei and produce bubbles. The images of the bubbles as well as their acoustic signal are recorded by two cameras and piezo-acoustic transducers, respectively. The acoustic discrimination efficiency between alphas and neutrons has been measured to be better than 99%. Results from two physics runs at SNOLAB showed an improvement in alpha discrimination and in sensitivity compared to a previous run at Fermilab.
|Original language||English (US)|
|Title of host publication||Very High Energy Phenomena in the Universe|
|Subtitle of host publication||Proceedings of the XLVIIIth Rencontres de Moriond|
|Editors||Etienne Auge, Jacques Dumarchez, Jean Tran Thanh Van|
|Number of pages||4|
|State||Published - 2013|