Design and construction of the DEAP-3600 dark matter detector

The Dark matter Experiment using Argon Pulse-shape discrimination (DEAP) has been designed for a direct detection search for particle dark matter using a single-phase liquid argon target. The projected cross section sensitivity for DEAP-3600 to the spin-independent scattering of Weakly Interacting Massive Particles (WIMPs) on nucleons is 10 cm for a 100 GeV/c WIMP mass with a fiducial exposure of 3 tonne-years. This paper describes the physical properties and construction of the DEAP-3600 detector. −46 2

Precision measurement of the specific activity of 39 Ar in atmospheric argon with the DEAP-3600 detector

The specific activity of the β decay of 39 Ar in atmospheric argon is measured using the DEAP-3600 detector. DEAP-3600, located 2 km underground at SNOLAB, uses a total of (3269 ± 24) kg of liquid argon distilled from the atmosphere to search for dark matter. This detector is well-suited to measure the decay of 39 Ar owing to its very low background levels. This is achieved in two ways: it uses low background construction materials; and it uses pulse-shape discrimination to differentiate between nuclear recoils and electron recoils. With 167 live-days of data, the measured specific activity at the time of atmospheric extraction is (0.964 ± 0.001 stat ± 0.024 sys) Bq/kg atmAr , which is consistent with results from other experiments. A cross-check analysis using different event selection criteria and a different statistical method confirms the result.</p

Hypernuclear physics with stopped K- at DA Phi NE

50nonenoneAGNELLO M; AMAUDRUZ PA; BEER G; BENUSSI L; BERTANI M; BIANCO S; BOTTA E; BRESSANI T; BUSSO L; CALVO D; CAMERINI P; CELANO L; CERELLO P; D'ERASMO G; FABBRI FL; FELICIELLO A; FILIPPI A; FILIPPINI V; FIORE EM; FIORE L; GIANOTTI P; GIARDONI M; GILL DR; GRION N; GUARALDO C; IAZZI F; LANARO A; LEE L; LUCHERINI V; MARCELLO S; MARCIANO G; MINETTI B; MIRFAKHRAI N; MORRA O; NOZDRIN AA; OLIN A; PANTALEO A; PATICCHIO V; RAIMONDO A; ROSSETTO E; ROTONDI A; RUI R; SALVINI P; SARWAR S; SERDYUK V; SMITH G; L. VENTURELLI; WHEADON R; YEN S; ZENONI AAgnello, M; Amaudruz, Pa; Beer, G; Benussi, L; Bertani, M; Bianco, S; Botta, E; Bressani, T; Busso, L; Calvo, D; Camerini, P; Celano, L; Cerello, P; D'Erasmo, G; Fabbri, Fl; Feliciello, A; Filippi, A; Filippini, V; Fiore, Em; Fiore, L; Gianotti, P; Giardoni, M; Gill, Dr; Grion, N; Guaraldo, C; Iazzi, F; Lanaro, A; Lee, L; Lucherini, V; Marcello, S; Marciano, G; Minetti, B; Mirfakhrai, N; Morra, O; Nozdrin, Aa; Olin, A; Pantaleo, A; Paticchio, V; Raimondo, A; Rossetto, E; Rotondi, A; Rui, R; Salvini, P; Sarwar, S; Serdyuk, V; Smith, G; Venturelli, Luca; Wheadon, R; Yen, S; Zenoni, Ald

Radon backgrounds in the DEAP-1 liquid-argon-based Dark Matter detector

The DEAP-1 \SI{7}{kg} single phase liquid argon scintillation detector was operated underground at SNOLAB in order to test the techniques and measure the backgrounds inherent to single phase detection, in support of the \mbox{DEAP-3600} Dark Matter detector. Backgrounds in DEAP are controlled through material selection, construction techniques, pulse shape discrimination and event reconstruction. This report details the analysis of background events observed in three iterations of the DEAP-1 detector, and the measures taken to reduce them. The $^{222}$Rn decay rate in the liquid argon was measured to be between 16 and \SI{26}{\micro\becquerel\per\kilogram}. We found that the background spectrum near the region of interest for Dark Matter detection in the DEAP-1 detector can be described considering events from three sources: radon daughters decaying on the surface of the active volume, the expected rate of electromagnetic events misidentified as nuclear recoils due to inefficiencies in the pulse shape discrimination, and leakage of events from outside the fiducial volume due to imperfect position reconstruction. These backgrounds statistically account for all observed events, and they will be strongly reduced in the DEAP-3600 detector due to its higher light yield and simpler geometry

Design and construction of the DEAP-3600 dark matter detector

The Dark matter Experiment using Argon Pulse-shape discrimination (DEAP) has been designed for a direct detection search for particle dark matter using a single-phase liquid argon target. The projected cross section sensitivity for DEAP-3600 to the spin-independent scattering of Weakly Interacting Massive Particles (WIMPs) on nucleons is 10−46cm2 for a 100 GeV/c2 WIMP mass with a fiducial exposure of 3 tonne-years. This paper describes the physical properties and construction of the DEAP-3600 detector