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Light yield in DarkSide-10: A prototype two-phase argon TPC for dark matter searches
Alexander, T Alton, D Arisaka, K Back, HO Beltrame, P Benziger, J Bonfini, G Brigatti, A Brodsky, J Cadonati, L
Alexander, T
Alton, D
Arisaka, K
Back, HO
Beltrame, P
Benziger, J
Bonfini, G
Brigatti, A
Brodsky, J
Cadonati, L
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Journal Article
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2013-09-30
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10.1016/j.astropartphys.2013.08.004
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As part of the DarkSide program of direct dark matter searches using two-phase 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 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.
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Elsevier BV
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Astroparticle Physics
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