CIRTE: Direct Measurement of the Bubble Nucleation Energy Threshold in a CF3I Bubble Chamber

CIRTE: Direct Measurement of the Bubble Nucleation Energy Threshold in a CF3I Bubble Chamber

The COUPP Collaboration have directly measured the energy threshold and efficiency for bubble nucleation from iodine recoils in a CF3I bubble chamber in the energy range of interest for a dark matter search. 

These interactions cannot be probed by standard neutron calibration methods, so the COUPP collaboration developed a new technique by observing the elastic scattering of 12 GeV/c negative pions. The pions are tracked with a silicon pixel telescope and the reconstructed scattering angle provides a measure of the nuclear recoilkinetic energy. The bubble chamber was operated with a nominal threshold of (13:6  0:6) keV.

This measurement confirms the applicability of CF3I as a target for spin-independent dark matter interactions and represents a novel technique for calibration of superheated fluid detectors.

Full article here.

 

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