Commissioning run of the CRESST-II dark matter search
By G. Angloher, M. Bauer, I. Bavykina, A. Bento, A. Brown, C. Bucci, C. Ciemniak, C. Coppi, G. Deuter, F. Feilitzsch and 33 more. 2008
155 citations recorded by the source corpus.
Abstract The CRESST cryogenic direct dark matter search at Gran Sasso, searching for WIMPs via nuclear recoil, has been upgraded to CRESST-II by several changes and improvements. The upgrade includes a new detector support structure capable of accommodating 33 modules, the associated multichannel readout with 66 SQUID channels, a neutron shield, a calibration source lift, and the installation of a muon veto. We present the results of a commissioning run carried out in 2007. The basic element of CRESST-II is a detector module consisting of a large ( ∼ 300 g ) CaWO 4 crystal and a very sensitive smaller ( ∼ 2 g ) light detector to detect the scintillation light from the CaWO 4 . The large crystal gives an accurate total energy measurement. The light detector permits a determination of the light yield for an event, allowing an effective separation of nuclear recoils from electron–photon backgrounds. Furthermore, information from light-quenching factor studies allows the definition of a region of the energy-light yield plane which corresponds to tungsten recoils. A neutron test is reported which supports the principle of using the light yield to identify the recoiling nucleus. Data obtained with two detector modules for a total exposure of 48 kg-days are presented. Judging by the rate of events in the “all nuclear recoils” acceptance region the apparatus shows a factor ∼10 improvement with respect to previous results, which we attribute principally to the presence of the neutron shield. In the “tungsten recoils” acceptance region three events are found, corresponding to a rate of 0.063 per kg-day. Standard assumptions on the dark matter flux, coherent or spin independent interactions, then yield a limit for WIMP-nucleon scattering of 4.8 × 10 - 7 pb , at M WIMP ∼ 50 GeV .
Subfields: Atomic and Molecular Physics, and Optics, Nuclear and High Energy Physics
View Paper: https://www.semanticscholar.org/paper/8f0d2149b500c060b54ea8ba5cf52d41622ebcaf
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In Atomic and Molecular Physics, and Optics
- J. Redondo
- A. Ringwald
- Igor G. Irastorza
- G. Raffelt
- K. Saikawa
- Romain Teyssier
- F. Avignone
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In Nuclear and High Energy Physics
Citations in the corpus
- Dark matter direct detection signals inferred from a cosmological N-body simulation with baryons (2009, background): “For the second commissioned run of 2007 (CRESST-II) [122, 40], the target is changed to CaWO4.”
- Any Light Particle Search II -- Technical Design Report (2013, methodology): “ssible backgrounds. In the field of experimental searches for rare events (e.g., direct Dark Matter experiments), TES detectors have been operated stable over the course of months (see e.g., CRESST II [92]). 3.4.2 Conceptual design CCD camera The design of the CCD detector is based upon the experienc”
- Conceptual design of the International Axion Observatory (IAXO) (2014, background): “re than adequate in WISP searches, where expected counting rates are well below 1 Hz. Within these limitations TES-based sensors are capable of counting single photons down to the sub-eV energy range [78, 79, 80]. The energy range of maximum sensitivity for TES-based sensors depends on the thickness”