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

R. Strauss; G. Angloher; A. Bento; C. Bucci; L. Canonica; A. Erb; F. V. Feilitzsch; N. Ferreiro Iachellini; P. Gorla; A. Gütlein; D. Hauff; J. Jochum; M. Kiefer; H. Kluck; 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; M. V. Sivers; L. Stodolsky; C. Strandhagen; A. Tanzke; M. Uffinger; A. Ulrich; I. Usherov; S. Wawoczny; M. Willers; M. Wüstrich; A. Zöller

doi:10.1088/1475-7516/2015/06/030

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

R. Strauss, G. Angloher, A. Bento, C. Bucci, L. Canonica, A. Erb, F. V. Feilitzsch, N. Ferreiro Iachellini, P. Gorla, A. Gütlein, D. Hauff, J. Jochum, M. Kiefer, H. Kluck, H. Kraus, J. C. Lanfranchi, J. Loebell, A. Münster, F. Petricca, W. PotzelF. Pröbst, F. Reindl, S. Roth, K. Rottler, C. Sailer, K. Schäffner, J. Schieck, S. Scholl, S. Schönert, W. Seidel, M. V. Sivers, L. Stodolsky, C. Strandhagen, A. Tanzke, M. Uffinger, A. Ulrich, I. Usherov, S. Wawoczny, M. Willers, M. Wüstrich, A. Zöller

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Abstract

The experiment CRESST-II aims at the detection of dark matter with scintillating CaWO₄ crystals operated as cryogenic detectors. Recent results on spin-independent WIMP-nucleon scattering from the CRESST-II Phase 2 allowed to probe a new region of parameter space for WIMP masses below 3 GeV/c². This sensitivity was achieved after background levels were reduced significantly. We present extensive background studies of a CaWO₄ 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 CaWO₄ 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.

Original language	English
Article number	030
Journal	Journal of Cosmology and Astroparticle Physics
Volume	2015
Issue number	6
DOIs	https://doi.org/10.1088/1475-7516/2015/06/030
State	Published - 1 Jun 2015

Keywords

dark matter detectors
dark matter experiments

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10.1088/1475-7516/2015/06/030

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Strauss, R., Angloher, G., Bento, A., Bucci, C., Canonica, L., Erb, A., Feilitzsch, F. V., Ferreiro Iachellini, N., Gorla, P., Gütlein, A., Hauff, D., Jochum, J., Kiefer, M., Kluck, H., Kraus, H., Lanfranchi, J. C., Loebell, J., Münster, A., Petricca, F., ... Zöller, A. (2015). Beta/gamma and alpha backgrounds in CRESST-II Phase 2. Journal of Cosmology and Astroparticle Physics, 2015(6), Article 030. https://doi.org/10.1088/1475-7516/2015/06/030

@article{0b2b34d4b5994272afd8e7c2a0245785,

title = "Beta/gamma and alpha backgrounds in CRESST-II Phase 2",

abstract = "The experiment CRESST-II aims at the detection of dark matter with scintillating CaWO4 crystals operated as cryogenic detectors. Recent results on spin-independent WIMP-nucleon scattering from the CRESST-II Phase 2 allowed to probe a new region of parameter space for WIMP masses below 3 GeV/c2. This sensitivity was achieved after background levels were reduced significantly. We present extensive background studies of a CaWO4 crystal, called TUM40, grown at the Technische Universit{\"a}t M{\"u}nchen. 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 CaWO4 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.",

keywords = "dark matter detectors, dark matter experiments",

author = "R. Strauss and G. Angloher and A. Bento and C. Bucci and L. Canonica and A. Erb and Feilitzsch, {F. V.} and {Ferreiro Iachellini}, N. and P. Gorla and A. G{\"u}tlein and D. Hauff and J. Jochum and M. Kiefer and H. Kluck and H. Kraus and Lanfranchi, {J. C.} and J. Loebell and A. M{\"u}nster and F. Petricca and W. Potzel and F. Pr{\"o}bst and F. Reindl and S. Roth and K. Rottler and C. Sailer and K. Sch{\"a}ffner and J. Schieck and S. Scholl and S. Sch{\"o}nert and W. Seidel and Sivers, {M. V.} and L. Stodolsky and C. Strandhagen and A. Tanzke and M. Uffinger and A. Ulrich and I. Usherov and S. Wawoczny and M. Willers and M. W{\"u}strich and A. Z{\"o}ller",

note = "Publisher Copyright: {\textcopyright} 2015 IOP Publishing Ltd and Sissa Medialab srl .",

year = "2015",

month = jun,

day = "1",

doi = "10.1088/1475-7516/2015/06/030",

language = "English",

volume = "2015",

journal = "Journal of Cosmology and Astroparticle Physics",

issn = "1475-7516",

publisher = "IOP Publishing Ltd.",

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Strauss, R, Angloher, G, Bento, A, Bucci, C, Canonica, L, Erb, A, Feilitzsch, FV, Ferreiro Iachellini, N, Gorla, P, Gütlein, A, Hauff, D, Jochum, J, Kiefer, M, Kluck, H, Kraus, H, Lanfranchi, JC, Loebell, J, Münster, A, Petricca, F, Potzel, W, Pröbst, F, Reindl, F, Roth, S, Rottler, K, Sailer, C, Schäffner, K, Schieck, J, Scholl, S, Schönert, S, Seidel, W, Sivers, MV, Stodolsky, L, Strandhagen, C, Tanzke, A, Uffinger, M, Ulrich, A, Usherov, I, Wawoczny, S, Willers, M, Wüstrich, M & Zöller, A 2015, 'Beta/gamma and alpha backgrounds in CRESST-II Phase 2', Journal of Cosmology and Astroparticle Physics, vol. 2015, no. 6, 030. https://doi.org/10.1088/1475-7516/2015/06/030

TY - JOUR

T1 - Beta/gamma and alpha backgrounds in CRESST-II Phase 2

AU - Strauss, R.

AU - Angloher, G.

AU - Bento, A.

AU - Bucci, C.

AU - Canonica, L.

AU - Erb, A.

AU - Feilitzsch, F. V.

AU - Ferreiro Iachellini, N.

AU - Gorla, P.

AU - Gütlein, A.

AU - Hauff, D.

AU - Jochum, J.

AU - Kiefer, M.

AU - Kluck, H.

AU - Kraus, H.

AU - Lanfranchi, J. C.

AU - Loebell, J.

AU - Münster, A.

AU - Petricca, F.

AU - Potzel, W.

AU - Pröbst, F.

AU - Reindl, F.

AU - Roth, S.

AU - Rottler, K.

AU - Sailer, C.

AU - Schäffner, K.

AU - Schieck, J.

AU - Scholl, S.

AU - Schönert, S.

AU - Seidel, W.

AU - Sivers, M. V.

AU - Stodolsky, L.

AU - Strandhagen, C.

AU - Tanzke, A.

AU - Uffinger, M.

AU - Ulrich, A.

AU - Usherov, I.

AU - Wawoczny, S.

AU - Willers, M.

AU - Wüstrich, M.

AU - Zöller, A.

PY - 2015/6/1

Y1 - 2015/6/1

N2 - The experiment CRESST-II aims at the detection of dark matter with scintillating CaWO4 crystals operated as cryogenic detectors. Recent results on spin-independent WIMP-nucleon scattering from the CRESST-II Phase 2 allowed to probe a new region of parameter space for WIMP masses below 3 GeV/c2. This sensitivity was achieved after background levels were reduced significantly. We present extensive background studies of a CaWO4 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 CaWO4 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.

AB - The experiment CRESST-II aims at the detection of dark matter with scintillating CaWO4 crystals operated as cryogenic detectors. Recent results on spin-independent WIMP-nucleon scattering from the CRESST-II Phase 2 allowed to probe a new region of parameter space for WIMP masses below 3 GeV/c2. This sensitivity was achieved after background levels were reduced significantly. We present extensive background studies of a CaWO4 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 CaWO4 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.

KW - dark matter detectors

KW - dark matter experiments

UR - http://www.scopus.com/inward/record.url?scp=84937913343&partnerID=8YFLogxK

U2 - 10.1088/1475-7516/2015/06/030

DO - 10.1088/1475-7516/2015/06/030

M3 - Article

AN - SCOPUS:84937913343

SN - 1475-7516

VL - 2015

JO - Journal of Cosmology and Astroparticle Physics

JF - Journal of Cosmology and Astroparticle Physics

IS - 6

M1 - 030

ER -

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

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