Textured silicon calorimetric light detector

Stefano, P. C. F. Di; Frank, T.; Angloher, G.; Bruckmayer, M.; Cozzini, C.; Hauff, D.; Proebst, F.; Rutzinger, S.; Seidel, W.; Stodolsky, L.; Schmidt, Jan

doi:10.1063/1.1619196

Cited by 19 publications

(11 citation statements)

References 16 publications

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“…In CaWO 4 the time constant for the emission of the scintillation photons is on the order of milliseconds at mK temperatures [9]. Thus to integrate the energy of the scintillation photons a long thermal relaxation time τ = C/G is required for the light detector.…”

Section: Light Channelmentioning

confidence: 99%

“…In addition, the large atomic mass (A=183.86) of tungsten makes CaWO 4 a very favorable target for WIMPs with coherent interactions. The prototype detector modules used here [7,9,10] consist of a 300 g cylindrical CaWO 4 crystal with 40 mm diameter and height, and an associated cryogenic light detector. The light detector is mounted close to a flat surface of the CaWO 4 crystal, and both detectors are enclosed in a housing of highly reflective polymeric multilayer foil [11].…”

Section: Detectorsmentioning

confidence: 99%

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Limits on WIMP dark matter using scintillating CaWO4 cryogenic detectors with active background suppression

Angloher

Bucci

Christ

et al. 2005

Astroparticle Physics

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We present first significant limits on WIMP dark matter by the phonon-light technique, where combined phonon and light signals from a scintillating cryogenic detector are used. Data from early 2004 with two 300 g CRESST-II prototype detector modules are presented, with a net exposure of 20.5 kg days. The modules consist of a CaWO 4 scintillating "target" crystal and a smaller cryogenic light detector. The combination of phonon and light signals leads to a strong suppression of non-nuclear recoil backgrounds. Using this information to define an acceptance region for nuclear recoils we have 16 events from the two modules, corresponding to a rate for nuclear recoils between 12 and 40 keV of (0.87± 0.22) events/(kg day). This is compatible with the rate expected from neutron background, and most of these events lie in the region of the phonon-light plane anticipated for neutron-induced recoils. A particularly strong limit for WIMPs with coherent scattering results from selecting a region of the phonon-light plane corresponding to tungsten recoils, where the best module shows zero events.

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Section: Light Channelmentioning

confidence: 99%

Section: Detectorsmentioning

confidence: 99%

Limits on WIMP dark matter using scintillating CaWO4 cryogenic detectors with active background suppression

Angloher

Bucci

Christ

et al. 2005

Astroparticle Physics

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220

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“…The scintillation light is absorbed in the wafer and results in a small but measurable temperature rise of the thermometer. Only about one percent of the total energy of a particle interaction is detected by the light channel [5,6,7]. Figure 1 shows one such detector module.…”

Section: Cresst-ii Detector Modulementioning

confidence: 99%

Discrimination of recoil backgrounds in scintillating calorimeters

Lang

Angloher

Bauer

et al. 2010

Astroparticle Physics

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The alpha decay of 210 Po is a dangerous background to rare event searches. Here, we describe observations related to this alpha decay in the Cryogenic Rare Event Search with Superconducting Thermometers (CRESST). We find that lead nuclei show a scintillation light yield in our CaWO4 crystals of 0.0142 ± 0.0013 relative to electrons of the same energy. We describe a way to discriminate this source of nuclear recoil background by means of a scintillating foil, and demonstrate its effectiveness. This leads to an observable difference in the pulse shape of the light detector, which can be used to tag these events. Differences in pulse shape of the phonon detector between lead and electron recoils are also extracted, opening the window to future additional background suppression techniques based on pulse shape discrimination in such experiments.PACS numbers: 29.40. Mc,29.40.Vj,95.35.+d

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“…Collectedlight yield here is understood as the fraction of energy that is deposited in a scintillator, transformed into light and detected by a calorimetric light detector [11]. It is not an absolute value, since a fraction of the light may be lost depending on the efficiency of the light detector and the setup.…”

Section: Crystals Doping and X-ray Scintillation Spectramentioning

confidence: 99%

“…Results in Table 1 show a wide spread. However, several samples show a light yield comparable or better than the 1.3% [11] of the CaWO 4 already in use by some dark matter experiments [3].…”

Section: Crystals Doping and X-ray Scintillation Spectramentioning

confidence: 99%

The SciCryo Project and Cryogenic Scintillation of Al2O3 for Dark Matter

et al. 2008

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We discuss cryogenic scintillation of Al 2 O 3 . Room-temperature measurements with α particles are first carried out to study effect of Ti concentration on response. Measurements under X-rays between room temperature and 10 K confirm a doubling of light output. The integration of a scintillation-phonon detector into an ionization-phonon dark matter search is underway, and the quenching factor for neutrons has been verified.

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Textured silicon calorimetric light detector

Cited by 19 publications

References 16 publications

Limits on WIMP dark matter using scintillating CaWO4 cryogenic detectors with active background suppression

Limits on WIMP dark matter using scintillating CaWO4 cryogenic detectors with active background suppression

Discrimination of recoil backgrounds in scintillating calorimeters

The SciCryo Project and Cryogenic Scintillation of Al2O3 for Dark Matter

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