A new concept of bubble chamber in dark matter searches.
Bertoni R., Chignoli F., Clemenza M., Cundy D., Lucchini G., Manara L., Pullia A., Redaelli N., Zanotti L.
The leading candidates for dark matter are WIMPs, which interact exclusively through gravity and the weak force. In a bubble chamber, when they hit a superheated liquid target, they deposit part of their energy, causing the formation of bubbles. The main advantage of this detector is strong rejection to beta and gamma background. The main disadvantage is global efficiencies of 30%, due to expansion cycles. Our challenge is to achieve efficiencies of 90% with a "geyser type bubble chamber" which works in a simple and natural continuous process of evaporation and condensation, with no moving part, and virtually 100% live-time.