Discrimination of nuclear recoils from alpha particles with superheated liquids

doi:10.1088/1367-2630/10/10/103017

Discrimination of nuclear recoils from alpha particles with superheated liquids

F Aubin et al 2008 New J. Phys. 10 103017 (11pp) doi: 10.1088/1367-2630/10/10/103017

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F Aubin^1,7, M Auger^1,8, M-H Genest^1,9, G Giroux¹, R Gornea^1,8, R Faust¹, C Leroy¹, L Lessard¹, J-P Martin¹, T Morlat^1,10, M-C Piro¹, N Starinski¹, V Zacek^1,12, B Beltran², C B Krauss², E Behnke³, I Levine³, T Shepherd³, P Nadeau⁴, U Wichoski⁴, S Pospisil⁵, I Stekl⁵, J Sodomka⁵, K Clark^6,11, X Dai⁶, A Davour⁶, C Levy⁶, A J Noble⁶ and C Storey⁶
¹ Département de Physique, Université de Montréal, Montréal, H3C 3J7, Canada
² Department of Physics, University of Alberta, Edmonton, T6G 2G7, Canada
³ Department of Physics and Astronomy, Indiana University South Bend, South Bend, IN 46634, USA
⁴ Department of Physics, Laurentian University, Sudbury, P3E 2C6, Canada
⁵ Institute of Experimental and Applied Physics, Czech Technical University in Prague, Prague, Cz-12800, Czech Republic
⁶ Department of Physics, Queens University, Kingston, K7L 3N6, Canada
⁷ Present address: Department of Physics, McGill University, Montréal, H3A 2T8, Canada.
⁸ Present address: Institut de Physique, Université de Neuchâtel, CH-2000, Neuchâtel, Switzerland.
⁹ Present address: Fakultät für Physik, Ludwig-Maximilians-Universität, D-85748 Garching, Germany.
¹⁰ Present address: Centro de Física Nuclear, Universidade de Lisboa, 1649-003, Portugal.
¹¹ Present address: Department of Physics, Case Western Reserve University, Cleveland OH 44106-7079, USA.
¹² Author to whom any correspondence should be addressed.
E-mail: zacekv@lps.umontreal.ca

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.

Received 11 July 2008
Published 16 October 2008

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Discrimination of nuclear recoils from alpha particles with superheated liquids

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