Electron and gamma background in CRESST detectors

Lang, R. F.; Angloher, G.; Bauer, M.; Bavykina, I.; Bento, A.; Brown, A.; Bucci, C.; Ciemniak, C.; Coppi, C.; Deuter, G.; Feilitzsch, F. von; Hauff, D.; Henry, S.; Huff, P.; Imber, J.; Ingleby, S.; Isaila, C.; Jochum, J.; Kiefer, M.; Kimmerle, M.; Kraus, H.; Lanfranchi, J.‐C.; Majorovits, B.; Malek, M.; McGowan, R. F.; Mikhailik, V.B.; Pantic, E.; Petricca, F.; Pfister, S.; Potzel, W.; Pröbst, F.; Roth, Stephan V.; Rottler, K.; Sailer, C.; Schäffner, K.; Schmaler, J.; Scholl, Stephan; Seidel, W.; Stodolsky, L.; Tolhurst, A.J.B.; Usherov, I.; Westphal, W.

doi:10.1016/j.astropartphys.2009.09.009

Cited by 14 publications

(17 citation statements)

References 10 publications

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“…• Proton capture on 182 W (and a successive decay) can result in 179 Ta which decays via EC to 179 Hf with a half-life of 665 d. The EC signature in our detectors is exactly the binding energy of the shell electrons of 179 Hf. In addition to a peak at 65.35 keV (K-shell) which was reported earlier [21] also distinct peaks at 11.27 keV (L1-shell), 10.74 keV (L2-shell) and 2.60 keV (M1-shell) could be identified here. The energies of all identified lines agree within errors with literature values and are listed in Table 1 with their corresponding activities.…”

Section: Beta/gamma Backgroundsupporting

confidence: 86%

“…• Proton capture on 183 W can result in 181 W which decays via electron capture (EC) to 181 Ta with a half-life of 121 d. We confirm the presence of a line at 74.02 keV (K-shell + 6.2 keV gamma) [21] with an activity of A K = (58.1 ± 14.5) µBq/kg. To observe higher-order shell EC processes, present statistics is not yet sufficient 3 .…”

Section: Beta/gamma Backgroundsupporting

confidence: 55%

“…Therefore, the beta/gamma background level is crucial for the sensitivity of CRESST-II detectors. The low-energy spectra (E ≤ 100 keV) of commercially available CaWO 4 crystals are usually dominated by two intrinsic beta/gamma background components [21]:…”

Section: Beta/gamma Backgroundmentioning

confidence: 99%

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Beta/gamma and alpha backgrounds in CRESST-II Phase 2

Strauß

Angloher

Bento

et al. 2015

J. Cosmol. Astropart. Phys.

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Abstract. The experiment CRESST-II aims at the detection of dark matter with scintillating CaWO 4 crystals operated as cryogenic detectors. Recent results on spin-independent WIMPnucleon scattering from the CRESST-II Phase 2 allowed to probe a new region of parameter space for WIMP masses below 3 GeV/c 2 . This sensitivity was achieved after background levels were reduced significantly. We present extensive background studies of a CaWO 4 crystal, called TUM40, grown at the Technische Universität München. The average beta/gamma rate of 3.51/[kg keV day] (1-40 keV) and the total intrinsic alpha activity from natural decay chains of 3.08 ± 0.04 mBq/kg are the lowest reported for CaWO 4 detectors. Contributions from cosmogenic activation, surface-alpha decays, external radiation and intrinsic alpha/beta emitters are investigated in detail. A Monte-Carlo based background decomposition allows to identify the origin of the majority of beta/gamma events in the energy region relevant for dark matter search.

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Section: Beta/gamma Backgroundsupporting

confidence: 86%

Section: Beta/gamma Backgroundsupporting

confidence: 55%

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Beta/gamma and alpha backgrounds in CRESST-II Phase 2

Strauß

Angloher

Bento

et al. 2015

J. Cosmol. Astropart. Phys.

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“…The overall cut efficiency of the template fit is 49.7% for CaWO4 and 52.7% for CaMoO4. The energy resolution of the phonon channel observed in this study is inferior compared with 0.6 keV reported for a phonon detector that uses CaWO4 absorber in a cryogenic Dark Matter search experiment [48]. On the other hand the energy resolution of measured CPSD with CaMoO4 absorber is better than what has been achieved with magnetic metal calorimeter phonon sensors developed for the neutrinoless DBD experiment [49].…”

Section: Phonon Channelscontrasting

confidence: 79%

Cryogenic phonon–scintillation detectors with PMT readout for rare event search experiments

Zhang

Lin

Mikhailik

et al. 2016

Astroparticle Physics

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a b s t r a c tCryogenic phonon-scintillation detectors (CPSD) for rare event search experiments require reliable, efficient and robust photon detectors that can resolve individual photons in a scintillation event. We report on a cryogenic detector containing a scintillating crystal, equipped with an NTD-Ge phonon sensor and a photon detector based on a low-temperature photomultiplier tube (PMT) that is powered by a CockcroftWalton generator. Here we present results from the characterisation of two detector modules, one with CaWO 4 , the other with CaMoO 4 as scintillator. The energy resolutions (FWHM) at 122.1 keV for the scintillation/PMT channel are 19.9% and 29.7% respectively for CaWO 4 and CaMoO 4 while the energy resolutions (FWHM) for the phonon channels are 2.17 keV (1.8%) and 0.97 keV (0.79%). These characteristics compare favourably with other CPSDs currently used in cryogenic rare-event search experiments. The detection module with PMT readout benefits from the implementation of a well-understood, reliable, and commercially available component and improved time resolution, while retaining the major advantages of conventional CPSD, such as high sensitivity, resolving power and discrimination ability.

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“…The legend for both plots are the same. The ovals designate the region of operation for the following low-temperature experiments: CUORE [28], EDELWEISS [40], CRESST [44], CDMS [31], X-ray microcalorimeters for astrophysics [42], and MARE (proposed) [29]. Note that these experiments use different combinations of thermal or athermal measurements, TES or NTD thermometry, and mass per detector unit, so cannot be directly compared to the design presented in this paper.…”

Section: B Detector Design and Expected Performancementioning

confidence: 99%

Sterile neutrinos, coherent scattering, and oscillometry measurements with low-temperature bolometers

2012

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Coherent neutrino-nucleon scattering offers a unique approach in the search for physics beyond the Standard Model. When used in conjunction with mono-energetic neutrino sources, the technique can be sensitive to the existence of light sterile neutrinos. The ability to utilize such reactions has been limited in the past due to the extremely low energy threshold (10−50 eV) needed for detection. In this paper, we discuss an optimization of cryogenic solid state bolometers that enables reaching extremely low kinetic energy thresholds. We investigate the sensitivity of an array of such detectors to neutrino oscillations to sterile states. A recent analysis of available reactor data appears to favor the existence of such such a sterile neutrino with a mass splitting of |∆m sterile | 2 ≥ 1.5 eV 2 and mixing strength of sin 2 2θ sterile = 0.17 ± 0.08 at 95% C.L. An array of such low-threshold detectors would be able to make a definitive statement as to the validity of the interpretation.

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Electron and gamma background in CRESST detectors

Cited by 14 publications

References 10 publications

Beta/gamma and alpha backgrounds in CRESST-II Phase 2

Beta/gamma and alpha backgrounds in CRESST-II Phase 2

Cryogenic phonon–scintillation detectors with PMT readout for rare event search experiments

Sterile neutrinos, coherent scattering, and oscillometry measurements with low-temperature bolometers

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