Detector calibration measurements in CRESST

Westphal, W.; Coppi, C.; Feilitzsch, F. von; Isaila, C.; Jagemann, T.; Jochum, J.; Konig, Joshua Leon; Lachenmaier, T.; Lanfranchi, J.‐C.; Potzel, W.; Rau, W.; Stark, M.; Wernicke, D.

doi:10.1016/j.nima.2005.12.013

Cited by 5 publications

(3 citation statements)

References 4 publications

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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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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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“…An additional cryogenic detector [21] in the vicinity of the crystal is used to detect the scintillation light, typically about 1% of the total energy for electrons [22]. The light detector response is calibrated and linearized independently of the scintillation light using externally created pulses injected into a heater structure on the thermometer [17].…”

Section: Setupmentioning

confidence: 99%

Scintillator Non-Proportionality and Gamma Quenching in CaWO4

Lang,

Angloher,

Bauer

et al. 2009

Preprint

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We measure and explain scintillator non-proportionality and gamma quenching of CaWO4 at low energies and low temperatures. Phonons that are created following an interaction in the scintillating crystal at temperatures of ∼ 15 mK are used for a calorimetric measurement of the deposited energy, and the scintillation light is measured with a separate cryogenic light detector. Making use of radioactivity intrinsic to the scintillating crystal, the scintillator non-proportionality is mapped out to electron energies < 5 keV. The observed behavior is in agreement with a simple model based on Birks' law and the stopping power dE/dx for electrons. We find for Birks' constant kB = (18.5 ± 0.7) nm/keV in CaWO4. Gamma lines allow a measurement of the reduced light yield of photons with respect to electrons, as expected in the presence of scintillator non-proportionality. In particular, we show that gamma-induced events in CaWO4 give only about 90% of the light yield of electrons, at energies between 40 keV and 80 keV.

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“…This can also be seen in figure 4, since the gamma lines which originate throughout the crystal are in the same band as the continuous background from electrons scattering on the surface of the crystal. In addition, since only a few percent of the signal are emitted as light [92,93,94], the quenching of the phonon channel can be neglected, giving a direct measurement of the energy from that channel. .…”

Section: Light Detectormentioning

confidence: 99%

Search for Dark Matter with CRESST

Lang,

Seidel

2009

Preprint

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The search for direct interactions of dark matter particles remains one of the most pressing challenges of contemporary experimental physics. A variety of different approaches is required to probe the available parameter space and to meet the technological challenges. Here, we review the experimental efforts towards the detection of direct dark matter interactions using scintillating crystals at cryogenic temperatures. We outline the ideas behind these detectors and describe the principles of their operation. Recent developments are summarized and various results from the search for rare processes are presented. In the search for direct dark matter interactions, the CRESST-II experiment delivers competitive limits, with a sensitivity below 5 × 10 −7 pb on the coherent WIMPnucleon cross section.

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Detector calibration measurements in CRESST

Cited by 5 publications

References 4 publications

Discrimination of recoil backgrounds in scintillating calorimeters

Discrimination of recoil backgrounds in scintillating calorimeters

Scintillator Non-Proportionality and Gamma Quenching in CaWO4

Search for Dark Matter with CRESST

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