Discrimination of nuclear recoils from alpha particles with superheated liquids
F. Aubin, M. Auger, E. Behnke, B. Beltran, K. Clark, X. Dai, A., Davour, M.-H. Genest, G. Giroux, R. Gornea, R. Faust, C.B. Krauss, C. Leroy,, L. Lessard, I. Levine, C. Levy, J.-P. Martin, T. Morlat, A. J. Noble, P., Nadeau, M.-C. Piro, S. Pospisil, T. Shepherd, J. Sodomka
TL;DR
The paper reports a novel acoustic discrimination method between nuclear recoils and alpha particles in superheated liquids, enhancing background suppression for dark matter detection.
Contribution
It introduces the first observation of acoustic signal differences between neutrons and alpha particles in superheated liquids, enabling improved background discrimination.
Findings
Significant acoustic differences observed between neutrons and alpha particles.
Multiple bubble formation on alpha tracks causes distinct acoustic signals.
Potential for enhanced background suppression in dark matter experiments.
Abstract
The PICASSO collaboration observed for the first time a significant difference between the acoustic signals induced by neutrons and alpha particles in a detector based on superheated liquids. This new discovery offers the possibility of improved background suppression and could be especially useful for dark matter experiments. This new effect may be attributed to the formation of multiple bubbles on alpha tracks, compared to single nucleations created by neutron induced recoils.
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