[1] Laurentian Univ, Dept Phys & Astron, Sudbury, ON P3E 2C6, Canada
[2] Univ Alberta, Dept Phys, Edmonton, AB T6G 2R3, Canada
[3] Univ British Columbia, Dept Phys & Astron, Vancouver, BC V6T 1Z1, Canada
[4] Brookhaven Natl Lab, Dept Chem, Upton, NY 11973 USA
[5] Carleton Univ, Dept Phys, Ottawa Carleton Inst Phys, Ottawa, ON K1S 5B6, Canada
[6] Univ Guelph, Dept Phys, Guelph, ON N1G 2W1, Canada
[7] Univ Calif Berkeley, Lawrence Berkeley Lab, Inst Nucl & Particle Astrophys, Berkeley, CA 94720 USA
[8] Univ Calif Berkeley, Lawrence Berkeley Lab, Div Nucl Sci, Berkeley, CA 94720 USA
[9] Lab Instrumentacao & Fis Expt Particulas, P-1000149 Lisbon, Portugal
[10] Los Alamos Natl Lab, Los Alamos, NM 87545 USA
[11] Louisiana State Univ, Dept Phys & Astron, Baton Rouge, LA 70803 USA
[12] MIT, Nucl Sci Lab, Cambridge, MA 02139 USA
[13] Univ Oxford, Dept Phys, Oxford OX1 3RH, England
[14] Univ Penn, Dept Phys & Astron, Philadelphia, PA 19104 USA
[15] Queens Univ, Dept Phys, Kingston, ON K7L 3N6, Canada
[16] Rutherford Appleton Lab, Didcot OX11 0QX, Oxon, England
[17] SNOLAB, Sudbury, ON P3Y 1M3, Canada
[18] Univ Texas Austin, Dept Phys, Austin, TX 78712 USA
[19] TRIUMF, Vancouver, BC V6T 2A3, Canada
[20] Univ Washington, Ctr Expt Nucl Phys & Astrophys, Seattle, WA 98195 USA
[21] Univ Washington, Dept Phys, Seattle, WA 98195 USA
[22] Univ London Imperial Coll Sci Technol & Med, London SW7 2AZ, England