Demonstration Of Surface Electron Rejection With Interleaved Germanium Detectors For Dark Matter Searches

R Agnese,A J Anderson, D Balakishiyeva,R Basu Thakur,D Bauer,A W Borgland,David C Brandt,P L Brink,R Bunker,Brenda Lopez Cabrera,David O Caldwell,D G Cerdeno, H Chagani,Michael L Cherry,J H Cooley,B Cornell, C H Crewdson, P Cushman,M Daal,P C F Di Stefano,E Do Couto E Silva,T Doughty,L Esteban, S Fallows, E Figueroafeliciano,J Fox,M J Fritts,G Godfrey,S R Golwala,J Hall, Harry Harris, J Hasi,S A Hertel, B A Hines,Thomas S Hofer,D Holmgren, Long Hsu,M E Huber, A Jastram,O Kamaev,B Kara,M H Kelsey,S Kenany, A J Kennedy,C J Kenney, M Kiveni,Klaus R Koch,B Loer,E Lopez Asamar, Roy D Mahapatra,V Mandic,C Martinez, K A Mccarthy,N Mirabolfathi,R A Moffatt,D Moore,P Nadeau,Randy Nelson, Leslie M Novak,Kevin Page, R M Partridge,M Pepin,A Phipps,K Prasad,M Pyle, Hang Qiu, R Radpour,W Rau,P Redl,A Reisetter,R Resch,Y Ricci,T Saab, B Sadoulet,J Sander,Randal L Schmitt, K Schneck,R W Schnee, S Scorza, D N Seitz,B Serfass, B Shank,D Speller,A Tomada,A N Villano,B Welliver,D H Wright,S Yellin, J J Yen,B A Young,Jie Zhang

APPLIED PHYSICS LETTERS（2013）

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摘要

The SuperCDMS experiment in the Soudan Underground Laboratory searches for dark matter with a 9-kg array of cryogenic germanium detectors. Symmetric sensors on opposite sides measure both charge and phonons from each particle interaction, providing excellent discrimination between electron and nuclear recoils, and between surface and interior events. Surface event rejection capabilities were tested with two Pb-210 sources producing similar to 130 beta decays/hr. In similar to 800 live hours, no events leaked into the 8-115 keV signal region, giving upper limit leakage fraction 1.7 x 10(-5) at 90% C.L., corresponding to <0.6 surface event background in the future 200-kg SuperCDMS SNOLAB experiment. (C) 2013 AIP Publishing LLC.

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关键词

sensors,phonon,surface,symmetry,electron,background,cryogenics,electrons,beta decay,cosmic radiation,dark matter,signals,phonons,germanium detector,surfaces

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