Light yield in DarkSide-10: A prototype two-phase argon TPC for dark matter searches |
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| Affiliation: | 1. Physics and Astronomy Department, Augustana College, Sioux Falls, SD 57197, USA;2. School of Natural Sciences, Black Hills State University, Spearfish, SD 57799, USA;3. Department of Physics, Drexel University, Philadelphia, PA 19104, USA;4. Fermi National Accelerator Laboratory, Batavia, IL 60510, USA;5. Institute of High Energy Physics, Beijing 100049, China;6. Institute for Nuclear Research, National Academy of Sciences of Ukraine, Kiev 03680, Ukraine;7. Smoluchowski Institute of Physics, Jagellonian University, Krakow 30059, Poland;8. Joint Institute for Nuclear Research, Dubna 141980, Russia;9. Laboratori Nazionali del Gran Sasso, SS 17 bis Km 18+910, Assergi, AQ 67010, Italy;10. Skobeltsyn Institute of Nuclear Physics, Lomonosov Moscow State University, Moscow 119991, Russia;11. National Research Centre Kurchatov Institute, Moscow 123182, Russia;12. Chemical Engineering Department, Princeton University, Princeton, NJ 08544, USA;13. Physics Department, Princeton University, Princeton, NJ 08544, USA;14. St. Petersburg Nuclear Physics Institute, Gatchina 188350, Russia;15. Physics Department, Temple University, Philadelphia, PA 19122, USA;p. Kavli Institute for Cosmological Physics, The University of Chicago, 5620 South Ellis Avenue - LASR 210, Chicago, IL 60637, USA;q. Department of Physics and Astronomy, University College London, London WC1E 6BT, United Kingdom;r. Physics Department, Università degli Studi and INFN, Genova 16146, Italy;s. Physics Department, Università degli Studi and INFN, Milano 20133, Italy;t. Physics Department, Università degli Studi Federico II and INFN, Napoli80126, Italy;u. Chemistry Department, Università degli Studi and INFN, Perugia 06123, Italy;v. Department of Physics and Astronomy, University of Arkansas, Little Rock, AR 72204, USA;w. Physics and Astronomy Department, University of California, Los Angeles, CA 90095, USA;x. Department of Physics, University of Houston, Houston, TX 77204, USA;y. Physics Department, University of Massachusetts, Amherst, MA 01003, USA;z. Physics Department, Virginia Tech, Blacksburg, VA 24061, USA;1. Department of Physics and Astronomy, and the Mitchell Institute for Fundamental Physics and Astronomy, Texas A& M University, College Station, TX 77843, USA;2. School of Physics & Astronomy, University of Minnesota, Minneapolis, MN 55455, USA;3. Department of Physics, University of Texas at Austin, Austin, TX 78712, USA;4. Department of Physics, University of Louisiana at Lafayette, Lafayette, LA 70504, USA;5. Department of Physics & Astronomy, Wayne State University, Detroit 48201, USA;6. School of Physical Sciences, National Institute of Science Education and Research, Jatni - 752050, India;7. Department of Nuclear Engineering, Texas A& M University, College Station Texas 77843, USA;8. Graduate School of Engineering, University of Fukui, Fukui 910-8507, Japan;9. Department of Physics, Engineering Physics & Astronomy, Queen''s University, Kingston, Ontario, Canada;10. TEES Nuclear Science Center, Texas A&M University, College Station TX 77843, USA;11. Department of Physics, Arizona State University, Tempe AZ 85287, USA;12. Department of Physics, University of South Dakota, Vermillion SD 57069, USA;13. Cyclotron Institute, Texas A& M University, College Station TX 77843, USA;14. Department of Physics, Sam Houston State University, Huntsville TX 77341, USA;1. AHEP Group, Instituto de Física Corpuscular – C.S.I.C./Universitat de València, Edificio de Institutos de Paterna, C/Catedratico José Beltrán, 2 E-46980 Paterna (València), Spain;2. Division of Theoretical Physics, University of Ioannina, GR 45110 Ioannina, Greece;3. National Institute of Science and Technology, Palur Hills, Berhampur - 761008, Odisha, India;4. Physical Research Laboratory, Ahmedabad 380 009, India |
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| Abstract: | 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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| Keywords: | Dark matter Argon Time projection chamber Light yield Photoelectron yield |
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