Astrophysics > Instrumentation and Methods for Astrophysics
[Submitted on 27 Apr 2012 (v1), last revised 14 Aug 2013 (this version, v2)]
Title:Light Yield in DarkSide-10: a Prototype Two-phase Liquid Argon TPC for Dark Matter Searches
View PDFAbstract:As part of the DarkSide program of direct dark matter searches using liquid argon TPCs, a prototype detector with an active volume containing 10 kg of liquid argon, DarkSide-10, was built and operated underground in the Gran Sasso National Laboratory in Italy. A critically important parameter for such devices is the scintillation light yield, as photon statistics limits the rejection of electron-recoil backgrounds by pulse shape discrimination. We have measured the light yield of DarkSide-10 using the readily-identifiable full-absorption peaks from gamma ray sources combined with single-photoelectron calibrations using low-occupancy laser pulses. For gamma lines of energies in the range 122-1275 keV, we get consistent light yields averaging 8.887+-0.003(stat)+-0.444(sys) p.e./keVee. With additional purification, the light yield measured at 511 keV increased to 9.142+-0.006(stat) p.e./keVee.
Submission history
From: Luca Grandi [view email][v1] Fri, 27 Apr 2012 13:58:49 UTC (1,729 KB)
[v2] Wed, 14 Aug 2013 15:34:01 UTC (1,869 KB)
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