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Optimization of light collection from crystal scintillators for cryogenic experiments

(2014)

Authors:

FA Danevich, RV Kobychev, VV Kobychev, H Kraus, VB Mikhailik, VM Mokina

Energy-Dependent Light Quenching in CaWO$_4$ Crystals at mK Temperatures

(2014)

Authors:

R Strauss, G Angloher, A Bento, C Bucci, L Canonica, W Carli, C Ciemniak, A Erb, FV Feilitzsch, P Gorla, A Gütlein, H Hagn, D Hauff, D Hellgartner, J Jochum, H Kraus, J-C Lanfranchi, J Loebell, A Münster, F Petricca, W Potzel, F Pröbst, F Reindl, S Roth, K Rottler, C Sailer, K Schäffner, J Schieck, S Scholl, S Schönert, W Seidel, MV Sivers, L Stodolsky, C Strandhagen, A Tanzke, M Uffinger, A Ulrich, I Usherov, S Wawoczny, M Willers, M Wüstrich, A Zöller

Snowmass CF1 Summary: WIMP Dark Matter Direct Detection

ArXiv 1310.8327 (2013)

Authors:

P Cushman, C Galbiati, DN McKinsey, H Robertson, TMP Tait, D Bauer, A Borgland, B Cabrera, F Calaprice, J Cooley, T Empl, R Essig, E Figueroa-Feliciano, R Gaitskell, S Golwala, J Hall, R Hill, A Hime, E Hoppe, L Hsu, E Hungerford, R Jacobsen, M Kelsey, RF Lang, WH Lippincott, B Loer, S Luitz, V Mandic, J Mardon, J Maricic, R Maruyama, R Mahapatra, H Nelson, J Orrell, K Palladino, E Pantic, R Partridge, A Ryd, T Saab, B Sadoulet, R Schnee, W Shepherd, A Sonnenschein, P Sorensen, M Szydagis, T Volansky, M Witherell, D Wright, K Zurek

Abstract:

As part of the Snowmass process, the Cosmic Frontier WIMP Direct Detection subgroup (CF1) has drawn on input from the Cosmic Frontier and the broader Particle Physics community to produce this document. The charge to CF1 was (a) to summarize the current status and projected sensitivity of WIMP direct detection experiments worldwide, (b) motivate WIMP dark matter searches over a broad parameter space by examining a spectrum of WIMP models, (c) establish a community consensus on the type of experimental program required to explore that parameter space, and (d) identify the common infrastructure required to practically meet those goals.

Axion searches with the EDELWEISS-II experiment

(2013)

Authors:

E Armengaud, Q Arnaud, C Augier, A Benoit, A Benoit, L Bergé, T Bergmann, J Blümer, A Broniatowski, V Brudanin, P Camus, A Cazes, B Censier, M Chapellier, F Charlieux, F Couëdo, P Coulter, GA Cox, T de Boissière, M De Jesus, Y Dolgorouky, AA Drillien, L Dumoulin, K Eitel, D Filosofov, N Fourches, J Gascon, G Gerbier, M Gros, L Hehn, S Henry, S Hervé, G Heuermann, N Holtzer, V Humbert, A Juillard, C Kéfélian, M Kleifges, H Kluck, V Kozlov, H Kraus, VA Kudryavtsev, H Le Sueur, M Mancuso, C Marrache-Kikuchi, S Marnieros, A Menshikov, X-F Navick, C Nones, E Olivieri, P Pari, B Paul, MC Piro, O Rigaut, M Robinson, S Rozov, V Sanglard, B Schmidt, B Siebenborn, D Tcherniakhovski, M Tenconi, L Vagneron, RJ Walker, M Weber, E Yakushev, X Zhang

Background studies for the EDELWEISS dark matter experiment

Astroparticle Physics 47 (2013) 1-9

Authors:

E Armengaud, C Augier, A Benoît, L Bergé, T Bergmann, J Blümer, A Broniatowski, V Brudanin, B Censier, M Chapellier, F Charlieux, F Couedo, P Coulter, GA Cox, M De Jesus, J Domange, AA Drilien, L Dumoulin, K Eitel, D Filosofov, N Fourches, J Gascon, G Gerbier, M Gros, S Henry, S Hervé, G Heuermann, N Holtzer, A Juillard, M Kleifges, H Kluck, V Kozlov, H Kraus, VA Kudryavtsev, H Le Sueur, P Loaiza, S Marnieros, A Menshikov, XF Navick, C Nones, E Olivieri, P Pari, B Paul, O Rigaut, M Robinson, S Rozov, V Sanglard, B Schmidt, S Scorza, B Siebenborn, S Semikh, D Tcherniakhovski, AS Torrento-Coello, L Vagneron, RJ Walker, M Weber, E Yakushev, X Zhang

Abstract:

The EDELWEISS-II collaboration has completed a direct search for WIMP dark matter using cryogenic Ge detectors (400 g each) and 384 kg × days of effective exposure. A cross-section of 4.4×10-8 pb is excluded at 90% C. L. for a WIMP mass of 85 GeV. The next phase, EDELWEISS-III, aims to probe spin-independent WIMP-nucleon cross-sections down to a few ×10 -9 pb. We present here the study of gamma and neutron background coming from radioactive decays in the set-up and shielding materials. We have carried out Monte Carlo simulations for the completed EDELWEISS-II setup with GEANT4 and normalised the expected background rates to the measured radioactivity levels (or their upper limits) of all materials and components. The expected gamma-ray event rate in EDELWEISS-II at 20-200 keV agrees with the observed rate of 82 events/kg/day within the uncertainties in the measured concentrations. The calculated neutron rate from radioactivity of 1.0-3.1 events (90% C. L.) at 20-200 keV in the EDELWEISS-II data together with the expected upper limit on the misidentified gamma-ray events (≤0.9), surface betas (≤0.3), and muon-induced neutrons (≤0.7), do not contradict five observed events in nuclear recoil band. We have then extended the simulation framework to the EDELWEISS-III configuration with 800 g crystals, better material purity and additional neutron shielding inside the cryostat. The gamma-ray and neutron backgrounds in 24 kg fiducial mass of EDELWEISS-III have been calculated as 14-44 events/kg/day and 0.7-1.4 events per year, respectively. The results of the background studies performed in the present work have helped to select better purity components and improve shielding in EDELWEISS-III to further reduce the expected rate of background events in the next phase of the experiment. © 2013 Elsevier B.V. All rights reserved.