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1. A prototype detector for the CRESST-III low-mass dark matter search

Author

Strauss, R., Angloher, G., Bauer, P., Defay, X., Erb, A., Feilitzsch, F. v., Iachellini, N. Ferreiro, Hampf, R., Hauff, D., Kiefer, M., Lanfranchi, J. -C., Langenkämper, A., Mondragon, E., Münster, A., Oppenheimer, C., Petricca, F., Potzel, W., Pröbst, F., Reindl, F., Rothe, J., Schönert, S., Seidel, W., Steiger, H., Stodolsky, L., Tanzke, A., Thi, H. H. Trinh, Ulrich, A., Wawoczny, S., Willers, M., Wüstrich, M., and Zöller, A.

Subjects
Astrophysics - Instrumentation and Methods for Astrophysics, Physics - Instrumentation and Detectors
Abstract

The CRESST-III experiment which is dedicated to low-mass dark matter search uses scintillating CaWO$_4$ crystals operated as cryogenic particle detectors. Background discrimination is achieved by exploiting the scintillating light signal of CaWO$_4$ and by a novel active detector holder presented in this paper. In a test setup above ground, a nuclear-recoil energy threshold of $E_{th}=(190.6\pm5.2)$eV is reached with a 24g prototype detector, which corresponds to an estimated threshold of $\sim$50eV when being operated in the low-noise CRESST cryostat. This is the lowest threshold reported for direct dark matter searches. For CRESST-III phase 1, ten such detector modules were installed in the cryostat which have the potential to improve significantly the sensitivity to scatterings of dark matter particles with masses down to $\sim$0.1GeV/c$^2$., Comment: 12 pages, 5 figures

Published
2018
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2. First results on low-mass dark matter from the CRESST-III experiment

Author

CRESST collaboration, Petricca, F., Angloher, G., Bauer, P., Bento, A., Bucci, C., Canonica, L., Defay, X., Erb, A., Feilitzsch, F. v., Iachellini, N. Ferreiro, Gorla, P., Gütlein, A., Hauff, D., Jochum, J., Kiefer, M., Kluck, H., Kraus, H., Lanfranchi, J. C., Lagenkämper, A., Loebell, J., Mancuso, M., Mondragon, E., Münster, A., Pagliarone, C., Potzel, W., Pröbst, F., Puig, R., Reindl, F., Rothe, J., Schäffner, K., Schieck, J., Schönert, S., Seidel, W., Stahlberg, M., Stodolsky, L., Strandhagen, C., Strauss, R., Tanzke, A., Thi, H. H. Trinh, Türkoğlu, C., Ulrich, A., Usherov, I., Wawoczny, S., Willers, M., and Wüstrich, M.

Subjects
Astrophysics - Cosmology and Nongalactic Astrophysics, Astrophysics - Instrumentation and Methods for Astrophysics
Abstract

The CRESST experiment, located at Laboratori Nazionali del Gran Sasso in Italy, searches for dark matter particles via their elastic scattering off nuclei in a target material. The CRESST target consists of scintillating CaWO$_4$ crystals, which are operated as cryogenic calorimeters at millikelvin temperatures. Each interaction in the CaWO$_4$ target crystal produces a phonon signal and a light signal that is measured by a second cryogenic calorimeter. Since the CRESST-II result in 2015, the experiment is leading the field of direct dark matter search for dark matter masses below 1.7\,GeV/$c^2$, extending the reach of direct searches to the sub-GeV/$c^2$ mass region. For CRESST-III, whose Phase 1 started in July 2016, detectors have been optimized to reach the performance required to further probe the low-mass region with unprecedented sensitivity. In this contribution the achievements of the CRESST-III detectors will be discussed together with preliminary results and perspectives of Phase 1., Comment: XV International Conference on Topics in Astroparticle and Underground Physics, TAUP2017, submitted to Journal of Physics: Conference Series (JPCS)

Published
2017

3. Search for low-mass Dark Matter with the CRESST Experiment

Author

Kluck, H., Angloher, G., Bauer, P., Bento, A., Bucci, C., Canonica, L., Defay, X., Erb, A., Feilitzsch, F. v., Iachellini, N. Ferreiro, Gorla, P., Gütlein, A., Hauff, D., Jochum, J., Kiefer, M., Kraus, H., Lanfranchi, J. -C., Langenkämper, A., Loebell, J., Mancuso, M., Mondragon, E., Münster, A., Pagliarone, C., Petricca, F., Potzel, W., Pröbst, F., Puig, R., Reindl, F., Rothe, J., Schäffner, K., Schieck, J., Schönert, S., Seidel, W., Stahlberg, M., Stodolsky, L., Strandhagen, C., Strauss, R., Tanzke, A., Thi, H. H. Trinh, Türkoğlu, C., Ulrich, A., Usherov, I., Wawoczny, S., Willers, M., and Wüstrich, M.

Subjects
Astrophysics - Instrumentation and Methods for Astrophysics
Abstract

CRESST is a multi-stage experiment directly searching for dark matter (DM) using cryogenic $\mathrm{CaWO_4}$ crystals. Previous stages established leading limits for the spin-independent DM-nucleon cross section down to DM-particle masses $m_\mathrm{DM}$ below $1\,\mathrm{GeV/c^2}$. Furthermore, CRESST performed a dedicated search for dark photons (DP) which excludes new parameter space between DP masses $m_\mathrm{DP}$ of $300\,\mathrm{eV/c^2}$ to $700\,\mathrm{eV/c^2}$. In this contribution we will discuss the latest results based on the previous CRESST-II phase 2 and we will report on the status of the current CRESST-III phase 1: in this stage we have been operating 10 upgraded detectors with $24,\mathrm{g}$ target mass each and enhanced detector performance since summer 2016. The improved detector design in terms of background suppression and reduction of the detection threshold will be discussed with respect to the previous stage. We will conclude with an outlook on the potential of the next stage, CRESST-III phase 2., Comment: Contributed to the 13th Patras Workshop on Axions, WIMPs and WISPs, Thessaloniki, May 15 to 19, 2017

Published
2017

4. Performance of a CRESST-II Detector Module with True $4\pi$-veto

Author

Angloher, G., Bauer, P., Bento, A., Bucci, C., Canonica, L., Defay, X., Erb, A., Feilitzsch, F. v., Iachellini, N. Ferreiro, Gorla, P., Gütlein, A., Hauff, D., Jochum, J., Kiefer, M., Kluck, H., Kraus, H., Lanfranchi, J. C., Langenkämper, A., Loebell, J., Mancuso, M., Münster, A., Pagliarone, C., Petricca, F., Potzel, W., Pröbst, F., Reindl, F., Rothe, J., Schäffner, K., Schieck, J., Schönert, V. Schipperges S., Seidel, W., Stahlberg, M., Stodolsky, L., Strandhagen, C., Strauss, R., Tanzke, A., Thi, H. H. Trinh, Türkoğlu, C., Uffinger, M., Ulrich, A., Usherov, I., Wawoczny, S., Willers, M., Wüstrich, M., and Zöller, A.

Subjects
Astrophysics - Instrumentation and Methods for Astrophysics, Physics - Instrumentation and Detectors
Abstract

Scintillating, cryogenic bolometers are widely used in the field of rare event searches. Their main advantages are an excellent energy resolution and particle identification on an event-by-event basis. The sensitivity of experiments applying this detector technique can be limited by the performance of the light channel and the presence of external backgrounds in the region of interest. In the framework of the CRESST-II experiment, we developed and successfully tested a novel detector design addressing both challenges. Using a large scale ($\approx$\unit[60]{cm$^2$}), beaker-shaped silicon light absorber, the signal height recorded in the light channel is improved by a factor 2.5 compared to conventional CRESTT-II detector modules. In combination with a large carrier crystal, a true $4\pi$ veto system is established which allows to tag external background sources., Comment: 7 pages, 5 fugures, submitted to EPJ-C

Published
2017

5. Results on MeV-scale dark matter from a gram-scale cryogenic calorimeter operated above ground

Author

Angloher, G., Bauer, P., Bento, A., Bucci, C., Canonica, L., Defay, X., Erb, A., Feilitzsch, F. v., Iachellini, N. Ferreiro, Gorla, P., Gütlein, A., Hauff, D., Jochum, J., Kiefer, M., Kluck, H., Kraus, H., Lanfranchi, J. -C., Loebell, A. Langenkämper J., Mancuso, M., Mondragon, E., Münster, A., Oberauer, L., Pagliarone, C., Petricca, F., Potzel, W., Pröbst, F., Puig, R., Reindl, F., Rothe, J., Schäffner, K., Schieck, J., Schönert, S., Seidel, W., Stahlberg, M., Stodolsky, L., Strandhagen, C., Strauss, R., Tanzke, A., Thi, H. H. Trinh, Türkoglu, C., Uffinger, M., Ulrich, A., Usherov, I., Wawoczny, S., Willers, M., Wüstrich, M., and Zöller, A.

Subjects
Astrophysics - Cosmology and Nongalactic Astrophysics, Astrophysics - Instrumentation and Methods for Astrophysics, Physics - Instrumentation and Detectors
Abstract

Models for light dark matter particles with masses below 1 GeV/c$^2$ are a natural and well-motivated alternative to so-far unobserved weakly interacting massive particles. Gram-scale cryogenic calorimeters provide the required detector performance to detect these particles and extend the direct dark matter search program of CRESST. A prototype 0.5 g sapphire detector developed for the $\nu$-cleus experiment has achieved an energy threshold of $E_{th}=(19.7\pm 0.9)$ eV, which is one order of magnitude lower than previous results and independent of the type of particle interaction. The result presented here is obtained in a setup above ground without significant shielding against ambient and cosmogenic radiation. Although operated in a high-background environment, the detector probes a new range of light-mass dark matter particles previously not accessible by direct searches. We report the first limit on the spin-independent dark matter particle-nucleon cross section for masses between 140 MeV/c$^2$ and 500 MeV/c$^2$., Comment: 6 pages, 6 figures, v3: ancillary files added, v4: high energy spectrum (0.6-12keV) added to ancillary files

Published
2017
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6. Silicon PIN diodes as Neganov-Trofimov-Luke cryogenic light detectors

Author

Defay, X., Mondragon, E., Lanfranchi, J. -C., Langenkamper, A., Munster, A., Potzel, W., Schonert, S., Wawoczny, S., and Willers, M.

Subjects
Physics - Instrumentation and Detectors
Abstract

Cryogenic rare event searches based on heat and light composite calorimeters have a common need for large area photon detectors with high quantum efficiency, good radiopurity and high sensitivity. By employing the Neganov-Trofimov-Luke effect (NTLE), the phonon signal of particle interactions in a semiconductor absorber operated at cryogenic temperatures can be amplified by drifting the photogenerated electrons and holes in an electric field. We present here the last results of a Neganov-Trofimov-Luke effect light detector with an electric field configuration optimized to improve the charge collection within the absorber., Comment: Submitted

Published
2017
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7. Low-Temperature Relative Reflectivity Measurements of Reflective and Scintillating Foils used in Rare Event Searches

Author

Langenkämper, A., Ulrich, A., Defay, X., Feilitzsch, F. v., Lanfranchi, J. -C., Mondragón, E., Münster, A., Oppenheimer, C., Potzel, W., Roth, S., Schönert, S., Steiger, H., Thi, H. H. Trinh, Wawoczny, S., Willers, M., and Zöller, A.

Subjects
Astrophysics - Instrumentation and Methods for Astrophysics, Physics - Instrumentation and Detectors
Abstract

In this work we investigate the reflectivity of highly reflective multilayer polymer foils used in the CRESST experiment. The CRESST experiment searches directly for dark matter via operating scintillating CaWO$_4$ crystals as targets for elastic dark matter-nucleon scattering. In order to suppress background events, the experiment employs the so-called phonon-light technique which is based on the simultaneous measurement of the heat signal in the main CaWO$_4$ target crystal and of the emitted scintillation light with a separate cryogenic light detector. Both detectors are surrounded by a highly reflective and scintillating multilayer polymer foil to increase the light collection efficiency and to veto surface backgrounds. While this study is motivated by the CRESST experiment, the results are also relevant for other rare event searches using scintillating cryogenic bolometers in the field of the search of dark matter and neutrinoless double beta decay ($0\nu\beta\beta$). In this work a dedicated experiment has been set up to determine the relative reflectivity at 300 K and 20 K of three multilayer foils ("VM2000", "VM2002", "Vikuiti") produced by the company 3M. The intensity of a light beam reflected off the foil is measured with a CCD camera. The ratio of the intensities at 300 K and 20 K corresponds to the relative reflectivity change. The measurements performed in this work show no significant change in the reflectivity with temperature for all foils studied., Comment: 6 pages, 7 figures

Published
2017
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8. Description of CRESST-II data

Author

Angloher, G., Bauer, P., Bento, A., Bucci, C., Canonica, L., Defay, X., Erb, A., Feilitzsch, F. v., Iachellini, N. Ferreiro, Gorla, P., Gütlein, A., Hauff, D., Jochum, J., Kiefer, M., Kistner, C., Kluck, H., Kraus, H., Lanfranchi, J. -C., Loebell, J., Mancuso, M., Münster, A., Pagliarone, C., Petricca, F., Potzel, W., Pröbst, F., Puig, R., Reindl, F., Roth, S., Rottler, K., Sailer, C., Schäffner, K., Schieck, J., Schmaler, J., Scholl, S., Schönert, S., Seidel, W., Sivers, M. v., Stodolsky, L., Strandhagen, C., Strauss, R., Tanzke, A., Thi, H. H. Trinh, Türkoǧlu, C., Uffinger, M., Ulrich, A., Usherov, I., Wawoczny, S., Willers, M., Wüstrich, M., and Zöller, A.

Subjects
Physics - Instrumentation and Detectors
Abstract

In Phase 2 of CRESST-II 18 detector modules were operated for about two years (July 2013 - August 2015). Together with this document we are publishing data from two detector modules which have been used for direct dark-matter searches. With these data-sets we were able to set world-leading limits on the cross section for spin-independent elastic scattering of dark matter particles off nuclei. We publish the energies of all events within the acceptance regions for dark-matter searches. In addition, we also publish the energies of the events within the electron-recoil band. This data set can be used to study interactions with electrons of CaWO$_4$. In this document we describe how to use these data sets. In particular, we explain the cut-survival probabilities required for comparisons of models with the data sets., Comment: Text unchanged to v2, new ancillary files added containing simulated data for the sensitivity projections of CRESST-III phase 2 with 1 tonne day exposure, additional information may be found in anc/Proj_CRESST-III-Phase2_README.txt

Published
2017

9. Dark-Photon Search using Data from CRESST-II Phase 2

Author

Angloher, G., Bauer, P., Bento, A., Bucci, C., Canonica, L., Defay, X., Erb, A., Feilitzsch, F. v., Iachellini, N. Ferreiro, Gorla, P., Gütlein, A., Hauff, D., Jochum, J., Kiefer, M., Kluck, H., Kraus, H., Lanfranchi, J. C., Loebell, J., Mancuso, M., Münster, A., Pagliarone, C., Petricca, F., Potzel, W., Pröbst, F., Puig, R., Reindl, F., Schäffner, K., Schieck, J., Schönert, S., Seidel, W., Stodolsky, L., Strandhagen, C., Strauss, R., Tanzke, A., Thi, H. H. Trinh, Türkoǧlu, C., Uffinger, M., Ulrich, A., Usherov, I., Wawoczny, S., Willers, M., Wüstrich, M., and Zöller, A.

Subjects
High Energy Physics - Experiment, Physics - Instrumentation and Detectors
Abstract

Identifying the nature and origin of dark matter is one of the major challenges for modern astro and particle physics. Direct dark-matter searches aim at an observation of dark-matter particles interacting within detectors. The focus of several such searches is on interactions with nuclei as provided e.g. by Weakly Interacting Massive Particles. However, there is a variety of dark-matter candidates favoring interactions with electrons rather than with nuclei. One example are dark photons, i.e., long-lived vector particles with a kinetic mixing to standard-model photons. In this work we present constraints on this kinetic mixing based on data from CRESST-II Phase 2 corresponding to an exposure before cuts of 52\,kg-days. These constraints improve the existing ones for dark-photon masses between 0.3 and 0.7\,keV/c$^2$., Comment: submitted EPJ C

Published
2016
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10. Direct Dark Matter Search with the CRESST II Experiment

Author

Schieck, J, Angloher, G, Bento, A, Bucci, C, Canonica, L, Defay, X, Erb, A, Feilitzsch, F v, Iachellini, N Ferreiro, Gorla, P, Guetlein, A, Hauff, D, Jochum, J, Kiefer, M, Kluck, H, Kraus, H, Lanfranchi, J-C, Loebell, J, Mancuso, M, Muenster, A, Pagliarone, C, Petricca, F, Potzel, W, Pröbst, F, Puig, R, Reindl, F, Schaeffner, K, Schoenert, S, Seidel, W, Stahlberg, M, Stodolsky, L, Strandhagen, C, Strauss, R, Tanzke, A, Thi, H H Trinh, Turkoglu, C, Uffinger, M, Ulrich, A, Usherov, I, Wawoczny, S, Willers, M, Wueustrich, M, and Zoeller, A

Subjects
Astrophysics - Cosmology and Nongalactic Astrophysics, Astrophysics - Instrumentation and Methods for Astrophysics, Physics - Instrumentation and Detectors
Abstract

The quest for the particle nature of dark matter is one of the big open questions of modern physics. A well motivated candidate for dark matter is the so-called WIMP - a weakly interacting massive particle. Recently several theoretically well-motivated models with dark matter candidates in a mass region below the WIMP mass-scale gained also a lot of interest, theoretically and experimentally. The CRESST II experiment located at the Gran Sasso laboratory in Italy is optimised for the detection of the elastic scattering of these low-mass dark matter particles with ordinary matter. We show the results obtained with an improved detector setup with increased radio purity and enhanced background rejection and the results obtained with a dedicated low-threshold analysis of a single conventional detector module. The limit achieved is the most stringent limit achieved for direct dark matter experiments in the mass region below 1.8 GeV/$c^{2}$. We will discuss the expected performance for new small CRESST-type detectors to be used during the next data taking phase. We conclude with an outlook of the future potential for direct dark matter detection using further improved CRESST CaWO$_{4}$ cryogenic detectors., Comment: Proceedings, contribution to ICHEP 2016, Chigaco

Published
2016

11. New Limits on Double Electron Capture of $^{40}$Ca and $^{180}$W

Author

Angloher, G., Bauer, M., Bauer, P., Bavykina, I., Bento, A., Bucci, C., Canonica, L., Ciemniak, C., Defay, X., Deuter, G., Erb, A., Feilitzsch, F. v., Iachellini, N. Ferreiro, Gorla, P., Gütlein, A., Hauff, D., Huff, P., Isaila, C., Jochum, J., Kiefer, M., Kimmerle, M., Kluck, H., Kraus, H., Lanfranchi, J. -C., Loebell, J., Münster, A, Pagliarone, C., Petricca, F., Pfister, S., Potzel, W., Pröbst, F., Reindl, F., Roth, S., Rottler, K., Sailer, C., Schäffner, K., Schieck, J., Schmaler, J., Scholl, S., Schönert, S., Seidel, W., Sivers, M. v., Stodolsky, L., Strandhagen, C., Strauss, R., Tanzke, A., Tretyak, V., Thi, H. H. Trinh, Türkoğlu, C., Uffinger, M., Ulrich, A., Usherov, I., Wawoczny, S., Willers, M., Wüstrich, M., and Zöller, A.

Subjects
Nuclear Experiment, Physics - Instrumentation and Detectors
Abstract

We analyzed low-background data from the CRESST-II experiment with a total net exposure of 730 kg days to extract limits on double electron capture processes. We established new limits for $^{40}$Ca with $T_{1/2}^{2v2K}>9.9\times10^{21}$ y and $T_{1/2}^{0v2EC}>1.4\times10^{22}$ y and for $^{180}$W with T$_{1/2}^{2v2K}>3.1\times10^{19}$ y and $T_{1/2}^{0v2EC}>9.4\times10^{18}$ y at 90% CL. Depending on the process, these values improve the currently best limits by a factor of $\sim$1.4-30.

Published
2016
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12. Limits on momentum-dependent asymmetric dark matter with CRESST-II

Author

Angloher, G., Bento, A., Bucci, C., Canonica, L., Defay, X., Erb, A., Feilitzsch, F. v., Iachellini, N. Ferreiro, Gorla, P., Gütlein, A., Hauff, D., Jochum, J., Kiefer, M., Kluck, H., Kraus, H., Lanfranchi, J. -C., Loebell, J., Münster, A., Pagliarone, C., Petricca, F., Potzel, W., Pröbst, F., Reindl, F., Schäffner, K., Schieck, J., Schönert, S., Seidel, W., Stodolsky, L., Strandhagen, C., Strauss, R., Tanzke, A., Thi, H. H. Trinh, Türkoğlu, C., Uffinger, M., Ulrich, A., Usherov, I., Wawoczny, S., Willers, M., Wüstrich, M., and Zöller, A.

Subjects
Astrophysics - Cosmology and Nongalactic Astrophysics, Astrophysics - Instrumentation and Methods for Astrophysics
Abstract

The usual assumption in direct dark matter searches is to only consider the spin-dependent or spin-independent scattering of dark matter particles. However, especially in models with light dark matter particles $\mathcal{O}(\mathrm{GeV/c^2})$, operators which carry additional powers of the momentum transfer $q^2$ can become dominant. One such model based on asymmetric dark matter has been invoked to overcome discrepancies in helioseismology and an indication was found for a particle with preferred mass of 3 $\mathrm{GeV/c^2}$ and cross section of $10^{-37} \mathrm{cm^2}$. Recent data from the CRESST-II experiment, which uses cryogenic detectors based on $\mathrm{CaWO_4}$ to search for nuclear recoils induced by dark matter particles, are used to constrain these momentum-dependent models. The low energy threshold of 307 eV for nuclear recoils of the detector used, allows us to rule out the proposed best fit value above., Comment: 4 pages, 4 figures

Published
2016
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13. Low-Temperature Scintillation Properties of CaWO4 Crystals for Rare-Event Searches

Author

Sivers, M. v., Clark, M., Di Stefano, P. C. F., Erb, A., Gütlein, A., Lanfranchi, J. -C., Münster, A., Nadeau, P., Piquemal, M., Potzel, W., Roth, S., Schreiner, K., Strauss, R., Wawoczny, S., Willers, M., and Zöller, A.

Subjects
Physics - Instrumentation and Detectors, Astrophysics - Instrumentation and Methods for Astrophysics
Abstract

In prospect of its application in cryogenic rare-event searches, we have investigated the low-temperature scintillation properties of CaWO4 crystals down to 3.4 K under {\alpha} and {\gamma} excitation. Concerning the scintillation decay times, we observe a long component in the ms range which significantly contributes to the light yield below 40K. For the first time we have measured the temperature dependence of the {\alpha}/{\gamma}- ratio of the light yield. This parameter which can be used to discriminate {\alpha} and {\gamma} events in scintillating bolometers is found to be about 8-15% smaller at low temperatures compared to room temperature., Comment: The following article has been accepted by Journal of Applied Physics. After it is published, it will be found at http://scitation.aip.org/content/aip/journal/jap

Published
2015

14. The CRESST Dark Matter Search - Status and Perspectives

Author

The CRESST Collaboration, Reindl, F., Angloher, G., Bento, A., Bucci, C., Canonica, L., Defay, X., Erb, A., Feilitzsch, F. v., Iachellini, N. Ferreiro, Gorla, P., Gütlein, A., Hauff, D., Jochum, J., Kiefer, M., Kluck, H., Kraus, H., Lanfranchi, J. C., Loebell, J., Münster, A., Pagliarone, C., Petricca, F., Potzel, W., Pröbst, F., Schäffner, K., Schieck, J., Schönert, S., Seidel, W., Stodolsky, L., Strandhagen, C., Strauss, R., Tanzke, A., Thi, H. H. Trinh, Türkoğlu, C., Uffinger, M., Ulrich, A., Usherov, I., Wawoczny, S., Willers, M., Wüstrich, M., and Zöller, A.

Subjects
Physics - Instrumentation and Detectors, Astrophysics - Cosmology and Nongalactic Astrophysics
Abstract

In the past years the spotlight of the search for dark matter particles widened to the low mass region, both from theoretical and experimental side. We discuss results from data obtained in 2013 with a single detector TUM40. This detector is equipped with a new upgraded holding scheme to efficiently veto backgrounds induced by surface alpha decays. This veto, the low threshold of 0.6keV and an unprecedented background level for CaWO$_4$ target crystals render TUM40 the detector with the best overall performance of CRESST-II phase 2 (July 2013 - August 2015). A low-threshold analysis allowed to investigate light dark matter particles (<3GeV/c$^2$), previously not accessible for other direct detection experiments., Comment: Talk presented CIPANP2015, 6 pages, 6 figures

Published
2015

15. Cryogenic silicon detectors with implanted contacts for the detection of visible photons using the Neganov-Luke Effect

Author

Defay, X., Mondragon, E., Willers, M., Langenkamper, A., Lanfranchi, J. -C., Munstera, A., Zoller, A., Wawoczny, S., Steiger, H., Hitzler, F., Bruhn, C., Schonert, S., Potzel, W., and Chapellier, M.

Subjects
Astrophysics - Instrumentation and Methods for Astrophysics, Physics - Instrumentation and Detectors
Abstract

There is a common need in astroparticle experiments such as direct dark matter detection, 0{\nu}\b{eta}\b{eta} (double beta decay without emission of neutrinos) and Coherent Neutrino Nucleus Scattering experiments for light detectors with a very low energy threshold. By employing the Neganov-Luke Effect, the thermal signal of particle interactions in a semiconductor absorber operated at cryogenic temperatures, can be amplified by drifting the photogenerated electrons and holes in an electric field. This technology is not used in current experiments, in particular because of a reduction of the signal amplitude with time which is due to trapping of the charges within the absorber. We present here the first results of a novel type of Neganov-Luke Effect detector with an electric field configuration designed to improve the charge collection within the semiconductor., Comment: 6 pages, 5 figures, submitted to Journal of Low Temperature Physics

Published
2015
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16. Results on light dark matter particles with a low-threshold CRESST-II detector

Author

The CRESST Collaboration, Angloher, G., Bento, A., Bucci, C., Canonica, L., Defay, X., Erb, A., Feilitzsch, F. v., Iachellini, N. Ferreiro, Gorla, P., Gütlein, A., Hauff, D., Jochum, J., Kiefer, M., Kluck, H., Kraus, H., Lanfranchi, J. C., Loebell, J., Münster, A., Pagliarone, C., Petricca, F., Potzel, W., Pröbst, F., Reindl, F., Schäffner, K., Schieck, J., Schönert, S., Seidel, W., Stodolsky, L., Strandhagen, C., Strauss, R., Tanzke, A., Thi, H. H. Trinh, Türkoğlu, C., Uffinger, M., Ulrich, A., Usherov, I., Wawoczny, S., Willers, M., Wüstrich, M., and Zöller, A.

Subjects
Astrophysics - Cosmology and Nongalactic Astrophysics, Astrophysics - Instrumentation and Methods for Astrophysics, Physics - Instrumentation and Detectors
Abstract

The CRESST-II experiment uses cryogenic detectors to search for nuclear recoil events induced by the elastic scattering of dark matter particles in CaWO$_4$ crystals. Given the low energy threshold of our detectors in combination with light target nuclei, low mass dark matter particles can be probed with high sensitivity. In this letter we present the results from data of a single detector module corresponding to 52 kg live days. A blind analysis is carried out. With an energy threshold for nuclear recoils of 307 eV we substantially enhance the sensitivity for light dark matter. Thereby, we extend the reach of direct dark matter experiments to the sub-region and demonstrate that the energy threshold is the key parameter in the search for low mass dark matter particles., Comment: 8 pages, 8 figures

Published
2015
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17. Probing low WIMP masses with the next generation of CRESST detector

Author

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

Subjects
Astrophysics - Instrumentation and Methods for Astrophysics, Astrophysics - Cosmology and Nongalactic Astrophysics, Physics - Instrumentation and Detectors
Abstract

The purpose of this document is to describe the upgrade of the CRESST dark matter search at LNGS. The proposed strategy will allow to explore a region of the parameter space for spin-independent WIMP-nucleon elastic scattering corresponding to WIMP masses below 10GeV/c$^\text{2}$, that has not been covered by other experiments. These results can be achieved only with outstanding detector performances in terms of threshold and background. This proposal shows how CRESST can match these performance requirements, adding a unique piece of information to the dark matter puzzle. The results of this program will fix a new state-of-the-art in the low mass WIMP exploration, opening new perspectives of understanding the dark matter scenario., Comment: 10 pages, 6 figures

Published
2015

18. In-situ study of light production and transport in phonon/light detector modules for dark matter search

Author

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

Subjects
Astrophysics - Instrumentation and Methods for Astrophysics, Astrophysics - Cosmology and Nongalactic Astrophysics, Physics - Instrumentation and Detectors
Abstract

The CRESST experiment (Cryogenic Rare Event Search with Superconducting Thermometers) searches for dark matter via the phonon and light signals of elastic scattering processes in scintillating crystals. The discrimination between a possible dark matter signal and background is based on the light yield. We present a new method for evaluating the two characteristics of a phonon/light detector module that determine how much of the deposited energy is converted to scintillation light and how efficiently a module detects the produced light. In contrast to former approaches with dedicated setups, we developed a method which allows us to use data taken with the cryogenic setup, during a dark matter search phase. In this way, we accounted for the entire process that occurs in a detector module, and obtained information on the light emission of the crystal as well as information on the performance of the module (light transport and detection). We found that with the detectors operated in CRESST-II phase 1, about 20% of the produced scintillation light is detected. A part of the light is likely absorbed by creating meta-stable excitations in the scintillating crystals. The light not detected is not absorbed entirely, as an additional light detector can help to increase the fraction of detected light.

Published
2015
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19. Beta/gamma and alpha backgrounds in CRESST-II Phase 2

Author

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

Subjects
Physics - Instrumentation and Detectors
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 WIMP-nucleon 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 Universit\"at M\"unchen. 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 $3.08\pm0.04$ 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., Comment: 17 pages, 7 figures, 3 tables

Published
2014
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20. A detector module with highly efficient surface-alpha event rejection operated in CRESST-II Phase 2

Author

Strauss, R., Angloher, G., Bento, A., Bucci, C., Canonica, L., Erb, A., Feilitzsch, F. v., Ferreiro, N., Gorla, P., Gütlein, A., Hauff, D., Jochum, J., Kiefer, M., Kluck, H., Kraus, H., Lanfranchi, J. -C., 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, M. v., Stanger, M., Stodolsky, L., Strandhagen, C., Tanzke, A., Uffinger, M., Ulrich, A., Usherov, I., Wawoczny, S., Willers, M., Wüstrich, M., and Zöller, A.

Subjects
Physics - Instrumentation and Detectors, Astrophysics - Cosmology and Nongalactic Astrophysics, Astrophysics - Instrumentation and Methods for Astrophysics
Abstract

The cryogenic dark matter experiment CRESST-II aims at the direct detection of WIMPs via elastic scattering off nuclei in scintillating CaWO$_4$ crystals. We present a new, highly improved, detector design installed in the current run of CRESST-II Phase 2 with an efficient active rejection of surface-alpha backgrounds. Using CaWO$_4$ sticks instead of metal clamps to hold the target crystal, a detector housing with fully-scintillating inner surface could be realized. The presented detector (TUM40) provides an excellent threshold of ${\sim}\,0.60\,$keV and a resolution of $\sigma\,{\approx}\,0.090$ keV (at 2.60$\,$keV). With significantly reduced background levels, TUM40 sets stringent limits on the spin-independent WIMP-nucleon scattering cross section and probes a new region of parameter space for WIMP masses below 3$\,$GeV/c$^2$. In this paper, we discuss the novel detector design and the surface-alpha event rejection in detail., Comment: 9 pages, 6 figures

Published
2014
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21. Impact of Coherent Neutrino Nucleus Scattering on Direct Dark Matter Searches based on CaWO$_4$ Crystals

Author

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

Subjects
High Energy Physics - Phenomenology, Physics - Instrumentation and Detectors
Abstract

Atmospheric and solar neutrinos scattering coherently off target nuclei will be an important background source for the next generation of direct dark matter searches. In this work we focus on calcium tungstate as target material. For comparison with existing works we calculate the neutrino floor indicating which sensitivities can be reached before the neutrino background appears. In addition, we investigate the sensitivities of future direct dark matter searches using CRESST-II like detectors. Extending previous works we take into account achievable energy resolutions and thresholds as well as beta and gamma backgrounds for this investigation. We show that an exploration of WIMP-nucleon cross sections below the neutrino floor is possible for exposures of $\gtrsim10$ kg-years or higher. In the third part we show that a first detection of coherent neutrino nucleus scattering of atmospheric and solar neutrinos using the same detectors and the backgrounds is feasible for exposures of $\gtrsim50$ kg-years., Comment: submitted to Astorparticle Physics

Published
2014
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22. Neganov-Luke amplified cryogenic light detectors for the background discrimination in neutrinoless double beta decay search with TeO$_{2}$ bolometers

Author

Willers, M., Feilitzsch, F. v., Giuliani, A., Gütlein, A., Münster, A., Lanfranchi, J. -C., Oberauer, L., Potzel, W., Roth, S., Schönert, S., Sivers, M. v., Wawoczny, S., and Zöller, A.

Subjects
Physics - Instrumentation and Detectors, High Energy Physics - Experiment
Abstract

We demonstrate that Neganov-Luke amplified cryogenic light detectors with Transition Edge Sensor read-out can be applied for the background suppression in cryogenic experiments searching for the neutrinoless double beta decay of $^{130}\text{Te}$ with TeO$_{2}$ based bolometers. Electron and gamma induced events can be discriminated from $\alpha$ events by detecting the Cherenkov light produced by the $\beta$ particles emitted in the decay. We use the Cherenkov light produced by events in the full energy peak of $^{208}\text{Tl}$ and by events from a $^{147}\text{Sm}$ source to show that at the Q-value of the neutrinoless double beta decay of $^{130}\text{Te}$ ($Q_{\beta \beta} = 2.53 \,\text{MeV}$), a separation of $e^{-}/\gamma$ events from $\alpha$ events can be achieved on an event-by-event basis with practically no reduction in signal acceptance., Comment: 10 pages, 4 figures, revision for submission to JINST

Published
2014
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23. Results on low mass WIMPs using an upgraded CRESST-II detector

Author

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

Subjects
Astrophysics - Cosmology and Nongalactic Astrophysics, Astrophysics - Instrumentation and Methods for Astrophysics, Physics - Instrumentation and Detectors
Abstract

The CRESST-II cryogenic dark matter search aims for the detection of WIMPs via elastic scattering off nuclei in CaWO$_4$ crystals. We present results from a low-threshold analysis of a single upgraded detector module. This module efficiently vetoes low energy backgrounds induced by $\alpha$-decays on inner surfaces of the detector. With an exposure of \unit[29.35]{kg live days} collected in 2013 we set a limit on spin-independent WIMP-nucleon scattering which probes a new region of parameter space for WIMP masses below \unit[3]{GeV/c$^2$}, previously not covered in direct detection searches. A possible excess over background discussed for the previous CRESST-II phase 1 (from 2009 to 2011) is not confirmed., Comment: 6 pages, 5 figures

Published
2014
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24. Radiopurity of CaWO$_4$ Crystals for Direct Dark Matter Search with CRESST and EURECA

Author

Münster, A., Sivers, M. v., Angloher, G., Bento, A., Bucci, C., Canonica, L., Erb, A., Feilitzsch, F. v., Gorla, P., Gütlein, A., Hauff, D., Jochum, J., Kraus, H., Lanfranchi, J. -C., Laubenstein, M., Loebell, J., Ortigoza, Y., Petricca, F., Potzel, W., Pröbst, F., Puimedon, J., Reindl, F., Roth, S., Rottler, K., Sailer, C., Schäffner, K., Schieck, J., Scholl, S., Schönert, S., Seidel, W., Stodolsky, L., Strandhagen, C., Strauss, R., Tanzke, A., Uffinger, M., Ulrich, A., Usherov, I., Wawoczny, S., Willers, M., Wüstrich, M., and Zöller, A.

Subjects
Astrophysics - Instrumentation and Methods for Astrophysics, Physics - Instrumentation and Detectors
Abstract

The direct dark matter search experiment CRESST uses scintillating CaWO$_4$ single crystals as targets for possible WIMP scatterings. An intrinsic radioactive contamination of the crystals as low as possible is crucial for the sensitivity of the detectors. In the past CaWO$_4$ crystals operated in CRESST were produced by institutes in Russia and the Ukraine. Since 2011 CaWO$_4$ crystals have also been grown at the crystal laboratory of the Technische Universit\"at M\"unchen (TUM) to better meet the requirements of CRESST and of the future tonne-scale multi-material experiment EURECA. The radiopurity of the raw materials and of first TUM-grown crystals was measured by ultra-low background $\gamma$-spectrometry. Two TUM-grown crystals were also operated as low-temperature detectors at a test setup in the Gran Sasso underground laboratory. These measurements were used to determine the crystals' intrinsic $\alpha$-activities which were compared to those of crystals produced at other institutes. The total $\alpha$-activities of TUM-grown crystals as low as 1.23 $\pm$ 0.06 mBq/kg were found to be significantly smaller than the activities of crystals grown at other institutes typically ranging between ~15 mBq/kg and ~35 mBq/kg., Comment: Corrected typos, results unchanged

Published
2014
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25. Energy-Dependent Light Quenching in CaWO$_4$ Crystals at mK Temperatures

Author

Strauss, R., Angloher, G., Bento, A., Bucci, C., Canonica, L., Carli, W., Ciemniak, C., Erb, A., Feilitzsch, F. v., Gorla, P., Gütlein, A., Hagn, H., Hauff, D., Hellgartner, D., Jochum, J., Kraus, H., Lanfranchi, J. -C., 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, M. v., Stodolsky, L., Strandhagen, C., Tanzke, A., Uffinger, M., Ulrich, A., Usherov, I., Wawoczny, S., Willers, M., Wüstrich, M., and Zöller, A.

Subjects
Astrophysics - Instrumentation and Methods for Astrophysics, Astrophysics - Cosmology and Nongalactic Astrophysics, Physics - Instrumentation and Detectors
Abstract

Scintillating CaWO$_4$ single crystals are a promising multi-element target for rare-event searches and are currently used in the direct Dark Matter experiment CRESST (Cryogenic Rare Event Search with Superconducting Thermometers). The relative light output of different particle interactions in CaWO$_4$ is quantified by Quenching Factors (QFs). These are essential for an active background discrimination and the identification of a possible signal induced by weakly interacting massive particles (WIMPs). We present the first precise measurements of the QFs of O, Ca and W at mK temperatures by irradiating a cryogenic detector with a fast neutron beam. A clear energy dependence of the QF of O and, less pronounced, of Ca was observed for the first time. Furthermore, in CRESST neutron-calibration data a variation of the QFs among different CaWO$_4$ single crystals was found. For typical CRESST detectors the QFs in the region-of-interest (10-40$\,$keV) are $QF_O^{ROI}=(11.2{\pm}0.5)\,$%, $QF_{Ca}^{ROI}=(5.94{\pm}0.49)\,$% and $QF_W^{ROI}=(1.72{\pm}0.21)\,$%. The latest CRESST data (run32) is reanalyzed using these fundamentally new results on light quenching in CaWO$_4$ having moderate influence on the WIMP analysis. Their relevance for future CRESST runs and for the clarification of previously published results of direct Dark Matter experiments is emphasized., Comment: 6 pages, 6 figures, 2 tables

Published
2014
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26. Influence of Annealing on the Optical and Scintillation Properties of CaWO$_4$ Single Crystals

Author

Sivers, M. v., Ciemniak, C., Erb, A., Feilitzsch, F. v., Gütlein, A., Lanfranchi, J. -C., Lepelmeier, J., Münster, A., Potzel, W., Roth, S., Strauss, R., Thalhammer, U., Wawoczny, S., Willers, M., and Zöller, A.

Subjects
Physics - Optics, Astrophysics - Instrumentation and Methods for Astrophysics
Abstract

We investigate the influence of oxygen annealing on the room temperature optical and scintillation properties of CaWO$_4$ single crystals that are being produced for direct Dark Matter search experiments. The applied annealing procedure reduces the absorption coefficient at the peak position of the scintillation spectrum ($\sim430$ nm) by a factor of $\sim6$ and leads to an even larger reduction of the scattering coefficient. Furthermore, the annealing has no significant influence on the \emph{intrinsic} light yield. An additional absorption occurring at $\sim400$ nm suggests the formation of O$^-$ hole centers. Light-yield measurements at room temperature where one crystal surface was mechanically roughened showed an increase of the \emph{measured} light yield by $\sim40 %$ and an improvement of the energy resolution at 59.5 keV by $\sim12 %$ for the annealed crystal. We ascribe this result to the reduction of the absorption coefficient while the surface roughening is needed to compensate for the also observed reduction of the scattering coefficient after annealing.

Published
2012
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27. The CRESST II Dark Matter Search

Author

Stodolsky, Leo, Angloher, G., Bauer, M., Bavykina, I., Bento, A., Bucci, C., Ciemniak, C., Deuter, G., Feilitzsch, F. v., Hauff, D., Huff, P., Isaila, C., Jochum, J., Kiefer, M., Kimmerle, M., Lanfranchi, J. C., Pfister, S., Petricca, F., Potzel, W., Proebst, F., Reindl, F., Roth, S., Rottler, K., Sailer, C., Schaeffner, K., Schmaler, J., Scholl, S., Seidel, W., Sivers, M. v., Strandhagen, C., Strauss, R., Tanzke, A., Usherov, I., Wawoczny, S., Willers, M., and Zoeller, A.

Subjects
Astrophysics - Cosmology and Nongalactic Astrophysics, Astrophysics - Instrumentation and Methods for Astrophysics
Abstract

Direct Dark Matter detection with cryodetectors is briefly discussed, with particular mention of the possibility of the identification of the recoil nucleus. Preliminary results from the CREEST II Dark Matter search, with 730 kg-days of data, are presented. Major backgrounds and methods of identifying and dealing with them are indicated., Comment: Talk at DSU workshop, ITP Beijing, Oct. 2011. 9 figures, 2 tables

Published
2012
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28. Results from 730 kg days of the CRESST-II Dark Matter Search

Author

Angloher, G., Bauer, M., Bavykina, I., Bento, A., Bucci, C., Ciemniak, C., Deuter, G., von Feilitzsch, F., Hauff, D., Huff, P., Isaila, C., Jochum, J., Kiefer, M., Kimmerle, M., Lanfranchi, J. -C., Petricca, F., Pfister, S., Potzel, W., Pröbst, F., Reindl, F., Roth, S., Rottler, K., Sailer, C., Schäffner, K., Schmaler, J., Scholl, S., Seidel, W., von Sivers, M., Stodolsky, L., Strandhagen, C., Strauß, R., Tanzke, A., Usherov, I., Wawoczny, S., Willers, M., and Zöller, A.

Subjects
Astrophysics - Cosmology and Nongalactic Astrophysics
Abstract

The CRESST-II cryogenic Dark Matter search, aiming at detection of WIMPs via elastic scattering off nuclei in CaWO$_4$ crystals, completed 730 kg days of data taking in 2011. We present the data collected with eight detector modules, each with a two-channel readout; one for a phonon signal and the other for coincidently produced scintillation light. The former provides a precise measure of the energy deposited by an interaction, and the ratio of scintillation light to deposited energy can be used to discriminate different types of interacting particles and thus to distinguish possible signal events from the dominant backgrounds. Sixty-seven events are found in the acceptance region where a WIMP signal in the form of low energy nuclear recoils would be expected. We estimate background contributions to this observation from four sources: 1) "leakage" from the e/\gamma-band 2) "leakage" from the \alpha-particle band 3) neutrons and 4) Pb-206 recoils from Po-210 decay. Using a maximum likelihood analysis, we find, at a high statistical significance, that these sources alone are not sufficient to explain the data. The addition of a signal due to scattering of relatively light WIMPs could account for this discrepancy, and we determine the associated WIMP parameters., Comment: 17 pages, 13 figures

Published
2011
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29. Dark-photon search using data from CRESST-II Phase 2

Author

Angloher, G., Bauer, P., Bento, A., Bucci, C., Canonica, L., Defay, X., Erb, A., Feilitzsch, F. v., Iachellini, N. Ferreiro, Gorla, P., Gütlein, A., Hauff, D., Jochum, J., Kiefer, M., Kluck, H., Kraus, H., Lanfranchi, J.-C., Loebell, J., Mancuso, M., Münster, A., Pagliarone, C., Petricca, F., Potzel, W., Pröbst, F., Puig, R., Reindl, F., Schäffner, K., Schieck, J., Schönert, S., Seidel, W., Stodolsky, L., Strandhagen, C., Strauss, R., Tanzke, A., Thi, H. H. Trinh, Türkoǧlu, C., Uffinger, M., Ulrich, A., Usherov, I., Wawoczny, S., Willers, M., Wüstrich, M., and Zöller, A.

Published
2017
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30. Results on light dark matter particles with a low-threshold CRESST-II detector

Author

Angloher, G., Bento, A., Bucci, C., Canonica, L., Defay, X., Erb, A., von Feilitzsch, F., Iachellini, N. Ferreiro, Gorla, P., Gütlein, A., Hauff, D., Jochum, J., Kiefer, M., Kluck, H., Kraus, H., Lanfranchi, J. C., Loebell, J., Münster, A., Pagliarone, C., Petricca, F., Potzel, W., Pröbst, F., Reindl, F., Schäffner, K., Schieck, J., Schönert, S., Seidel, W., Stodolsky, L., Strandhagen, C., Strauss, R., Tanzke, A., Trinh Thi, H. H., Türkoğlu, C., Uffinger, M., Ulrich, A., Usherov, I., Wawoczny, S., Willers, M., Wüstrich, M., and Zöller, A.

Published
2016
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31. A detector module with highly efficient surface-alpha event rejection operated in CRESST-II Phase 2

Author

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

Published
2015
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32. Results on low mass WIMPs using an upgraded CRESST-II detector

Author

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

Published
2014
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33. Results from 730 kg days of the CRESST-II Dark Matter search

Author

Angloher, G., Bauer, M., Bavykina, I., Bento, A., Bucci, C., Ciemniak, C., Deuter, G., von Feilitzsch, F., Hauff, D., Huff, P., Isaila, C., Jochum, J., Kiefer, M., Kimmerle, M., Lanfranchi, J.-C., Petricca, F., Pfister, S., Potzel, W., Pröbst, F., Reindl, F., Roth, S., Rottler, K., Sailer, C., Schäffner, K., Schmaler, J., Scholl, S., Seidel, W., Sivers, M. v., Stodolsky, L., Strandhagen, C., Strauß, R., Tanzke, A., Usherov, I., Wawoczny, S., Willers, M., and Zöller, A.

Published
2012
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34. A Low Nuclear Recoil Energy Threshold for Dark Matter Search with CRESST-III Detectors

Author

Mancuso, M, Angloher, G, Bauer, P, Bento, A, Bucci, C, Canonica, L, D'Addabbo, A, Defay, X, Erb, A, von Feilitzsch, F, Iachellini, N, Gorla, P, Gütlein, A, Hauff, D, Jochum, J, Kiefer, M, Kluck, H, Kraus, H, Lanfranchi, J, Langenkämper, A, Loebell, J, Mondragon, E, Münster, A, Pagliarone, C, Petricca, F, Potzel, W, Pröbst, F, Puig, R, Reindl, F, Rothe, J, Schäffner, K, Schieck, J, Schipperges, V, Schönert, S, Seidel, W, Stahlberg, M, Stodolsky, L, Strandhagen, C, Strauss, R, Tanzke, A, Thi, H, Türkoglu, C, Uffinger, M, Ulrich, A, Usherov, I, Wawoczny, S, Willers, M, Wüstrich, M, Mancuso M, Angloher G, Bauer P, Bento A, Bucci C, Canonica L, D'Addabbo A, Defay X, Erb A, von Feilitzsch F, Iachellini NF, Gorla P, Gütlein A, Hauff D, Jochum J, Kiefer M, Kluck H, Kraus H, Lanfranchi JC, Langenkämper A, Loebell J, Mondragon E, Münster A, Pagliarone C, Petricca F, Potzel W, Pröbst F, Puig R, Reindl F, Rothe J, Schäffner K, Schieck J, Schipperges V, Schönert S, Seidel W, Stahlberg M, Stodolsky L, Strandhagen C, Strauss R, Tanzke A, Thi HHT, Türkoglu C, Uffinger M, Ulrich A, Usherov I, Wawoczny S, Willers M, Wüstrich M, Mancuso, M, Angloher, G, Bauer, P, Bento, A, Bucci, C, Canonica, L, D'Addabbo, A, Defay, X, Erb, A, von Feilitzsch, F, Iachellini, N, Gorla, P, Gütlein, A, Hauff, D, Jochum, J, Kiefer, M, Kluck, H, Kraus, H, Lanfranchi, J, Langenkämper, A, Loebell, J, Mondragon, E, Münster, A, Pagliarone, C, Petricca, F, Potzel, W, Pröbst, F, Puig, R, Reindl, F, Rothe, J, Schäffner, K, Schieck, J, Schipperges, V, Schönert, S, Seidel, W, Stahlberg, M, Stodolsky, L, Strandhagen, C, Strauss, R, Tanzke, A, Thi, H, Türkoglu, C, Uffinger, M, Ulrich, A, Usherov, I, Wawoczny, S, Willers, M, Wüstrich, M, Mancuso M, Angloher G, Bauer P, Bento A, Bucci C, Canonica L, D'Addabbo A, Defay X, Erb A, von Feilitzsch F, Iachellini NF, Gorla P, Gütlein A, Hauff D, Jochum J, Kiefer M, Kluck H, Kraus H, Lanfranchi JC, Langenkämper A, Loebell J, Mondragon E, Münster A, Pagliarone C, Petricca F, Potzel W, Pröbst F, Puig R, Reindl F, Rothe J, Schäffner K, Schieck J, Schipperges V, Schönert S, Seidel W, Stahlberg M, Stodolsky L, Strandhagen C, Strauss R, Tanzke A, Thi HHT, Türkoglu C, Uffinger M, Ulrich A, Usherov I, Wawoczny S, Willers M, and Wüstrich M

Abstract

The CRESST-III experiment (Cryogenic Rare Events Search with Superconducting Thermometers), located at the underground facility Laboratori Nazionali del Gran Sasso in Italy, uses scintillating CaWO4 crystals as cryogenic calorimeters to search for direct dark matter interactions in detectors. A large part of the parameter space for spin-independent scattering off nuclei remains untested for dark matter particles with masses below a few GeV/c2, despite many naturally motivated theoretical models for light dark matter particles. The CRESST-III detectors are designed to achieve the performance required to probe the low-mass region of the parameter space with a sensitivity never reached before. In this paper, new results on the performance and an overview of the CRESST-III detectors will be presented, emphasizing the results about the low-energy threshold for nuclear recoil of CRESST-III Phase 1 which started collecting data in August 2016.

Published
2018

35. First results on low-mass dark matter from the CRESST-III experiment

Author

Petricca, F, primary, Angloher, G, additional, Bauer, P, additional, Bento, A, additional, Bucci, C, additional, Canonica, L, additional, Defay, X, additional, Erb, A, additional, Feilitzsch, F v, additional, Iachellini, N Ferreiro, additional, Gorla, P, additional, Gütlein, A, additional, Hauff, D, additional, Jochum, J, additional, Kiefer, M, additional, Kluck, H, additional, Kraus, H, additional, Lanfranchi, J C, additional, Langenkämper, A, additional, Loebell, J, additional, Mancuso, M, additional, Mondragon, E, additional, Münster, A, additional, Pagliarone, C, additional, Potzel, W, additional, Pröbst, F, additional, Puig, R, additional, Reindl, F, additional, Rothe, J, additional, Schäffner, K, additional, Schieck, J, additional, Schönert, S, additional, Seidelf, W, additional, Stahlberg, M, additional, Stodolsky, L, additional, Strandhagen, C, additional, Strauss, R, additional, Tanzke, A, additional, Thi, H H Trinh, additional, Türkoğlu, C, additional, Ulrich, A, additional, Usherov, I, additional, Wawoczny, S, additional, Willers, M, additional, and Wüstrich, M, additional

Published
2020
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36. Search for dark photons using data from CRESST-II Phase 2

Author

Gutlein, A, Angloher, G, Bento, A, Bucci, C, Canonica, L, Defay, X, Erb, A, von Feilitzsch, F, Iachellini, N, Gorla, P, Hauff, D, Jochum, J, Kiefer, M, Kluck, H, Kraus, H, Lanfranchi, J, Loebell, J, Mancuso, M, Munster, A, Pagliarone, C, Petricca, F, Potzel, W, Probst, F, Puig, R, Reindl, F, Schaffner, K, Schieck, J, Schonert, S, Seidel, W, Stahlberg, M, Stodolsky, L, Strandhagen, C, Strauss, R, Tanzke, A, Thi, H, Turkoglu, C, Uffinger, M, Ulrich, A, Usherov, I, Wawoczny, S, Willers, M, Wustrich, M, Zoller, A, Gutlein A, Angloher G, Bento A, Bucci C, Canonica L, Defay X, Erb A, von Feilitzsch F, Iachellini NF, Gorla P, Hauff D, Jochum J, Kiefer M, Kluck H, Kraus H, Lanfranchi JC, Loebell J, Mancuso M, Munster A, Pagliarone C, Petricca F, Potzel W, Probst F, Puig R, Reindl F, Schaffner K, Schieck J, Schonert S, Seidel W, Stahlberg M, Stodolsky L, Strandhagen C, Strauss R, Tanzke A, Thi HHT, Turkoglu C, Uffinger M, Ulrich A, Usherov I, Wawoczny S, Willers M, Wustrich M, Zoller A, Gutlein, A, Angloher, G, Bento, A, Bucci, C, Canonica, L, Defay, X, Erb, A, von Feilitzsch, F, Iachellini, N, Gorla, P, Hauff, D, Jochum, J, Kiefer, M, Kluck, H, Kraus, H, Lanfranchi, J, Loebell, J, Mancuso, M, Munster, A, Pagliarone, C, Petricca, F, Potzel, W, Probst, F, Puig, R, Reindl, F, Schaffner, K, Schieck, J, Schonert, S, Seidel, W, Stahlberg, M, Stodolsky, L, Strandhagen, C, Strauss, R, Tanzke, A, Thi, H, Turkoglu, C, Uffinger, M, Ulrich, A, Usherov, I, Wawoczny, S, Willers, M, Wustrich, M, Zoller, A, Gutlein A, Angloher G, Bento A, Bucci C, Canonica L, Defay X, Erb A, von Feilitzsch F, Iachellini NF, Gorla P, Hauff D, Jochum J, Kiefer M, Kluck H, Kraus H, Lanfranchi JC, Loebell J, Mancuso M, Munster A, Pagliarone C, Petricca F, Potzel W, Probst F, Puig R, Reindl F, Schaffner K, Schieck J, Schonert S, Seidel W, Stahlberg M, Stodolsky L, Strandhagen C, Strauss R, Tanzke A, Thi HHT, Turkoglu C, Uffinger M, Ulrich A, Usherov I, Wawoczny S, Willers M, Wustrich M, and Zoller A

Abstract

Understanding the nature and origin of dark matter is one of the most important challenges for modern particle physics. During the previous decade the sensitivities of direct dark matter searches have improved by several orders of magnitude. These experiments focus their work mainly on the search for dark-matter particles interacting with nuclei (e.g. Weakly Interacting Massive Particles, WIMPs). However, there exists a large variety of different candidates for dark-matter particles. One of these candidates, the so-called dark photon, is a long-lived vector boson with a kinetic mixing to the standard-model photon. In this work we present the preliminary results of our search for dark photons. Using data from the direct dark matter search CRESST-II Phase 2 we can improve the existing constraints for the kinetic mixing for dark-photon masses between 0.3 and 0.5 keV/c2. In addition, we also present projected sensitivities for the next phases of the CRESST-III experiment showing great potential to improve the sensitivity for dark-photon masses below 1 keV.

Published
2017

37. Dark-photon search using data from CRESST-II Phase 2

Author

Angloher, G, Bauer, P, Bento, A, Bucci, C, Canonica, L, Defay, X, Erb, A, von Feilitzsch, F, Iachellini, N, Gorla, P, Gutlein, A, Hauff, D, Jochum, J, Kiefer, M, Kluck, H, Kraus, H, Lanfranchi, J, Loebell, J, Mancuso, M, Munster, A, Pagliarone, C, Petricca, F, Potzel, W, Probst, F, Puig, R, Reindl, F, Schaffner, K, Schieck, J, Schonert, S, Seidel, W, Stodolsky, L, Strandhagen, C, Strauss, R, Tanzke, A, Thi, H, Turkoglu, C, Uffinger, M, Ulrich, A, Usherov, I, Wawoczny, S, Willers, M, Wustrich, M, Zoller, A, Angloher G, Bauer P, Bento A, Bucci C, Canonica L, Defay X, Erb A, von Feilitzsch F, Iachellini NF, Gorla P, Gutlein A, Hauff D, Jochum J, Kiefer M, Kluck H, Kraus H, Lanfranchi JC, Loebell J, Mancuso M, Munster A, Pagliarone C, Petricca F, Potzel W, Probst F, Puig R, Reindl F, Schaffner K, Schieck J, Schonert S, Seidel W, Stodolsky L, Strandhagen C, Strauss R, Tanzke A, Thi HHT, Turkoglu C, Uffinger M, Ulrich A, Usherov I, Wawoczny S, Willers M, Wustrich M, Zoller A, Angloher, G, Bauer, P, Bento, A, Bucci, C, Canonica, L, Defay, X, Erb, A, von Feilitzsch, F, Iachellini, N, Gorla, P, Gutlein, A, Hauff, D, Jochum, J, Kiefer, M, Kluck, H, Kraus, H, Lanfranchi, J, Loebell, J, Mancuso, M, Munster, A, Pagliarone, C, Petricca, F, Potzel, W, Probst, F, Puig, R, Reindl, F, Schaffner, K, Schieck, J, Schonert, S, Seidel, W, Stodolsky, L, Strandhagen, C, Strauss, R, Tanzke, A, Thi, H, Turkoglu, C, Uffinger, M, Ulrich, A, Usherov, I, Wawoczny, S, Willers, M, Wustrich, M, Zoller, A, Angloher G, Bauer P, Bento A, Bucci C, Canonica L, Defay X, Erb A, von Feilitzsch F, Iachellini NF, Gorla P, Gutlein A, Hauff D, Jochum J, Kiefer M, Kluck H, Kraus H, Lanfranchi JC, Loebell J, Mancuso M, Munster A, Pagliarone C, Petricca F, Potzel W, Probst F, Puig R, Reindl F, Schaffner K, Schieck J, Schonert S, Seidel W, Stodolsky L, Strandhagen C, Strauss R, Tanzke A, Thi HHT, Turkoglu C, Uffinger M, Ulrich A, Usherov I, Wawoczny S, Willers M, Wustrich M, and Zoller A

Abstract

Identifying the nature and origin of dark matter is one of the major challenges for modern astro and particle physics. Direct dark-matter searches aim at an observation of dark-matter particles interacting within detectors. The focus of several such searches is on interactions with nuclei as provided e.g. by weakly interacting massive particles. However, there is a variety of dark-matter candidates favoring interactions with electrons rather than with nuclei. One example are dark photons, i.e., long-lived vector particles with a kinetic mixing to standard-model photons. In this work we present constraints on this kinetic mixing based on data from CRESST-II Phase 2 corresponding to an exposure before cuts of 52 kg-days. These constraints improve the existing ones for dark-photon masses between 0.3 and 0.7 keV/c2.

Published
2017

38. Direct dark matter search with the CRESST-III experiment - status and perspectives

Author

Willers, M, Angloher, G, Bento, A, Bucci, C, Canonica, L, Defay, X, Erb, A, von Feilitzsch, F, Iachellini, N, Gutlein, A, Gorla, P, Hauff, D, Jochum, J, Kiefer, M, Kluck, H, Kraus, H, Lanfranchi, J, Loebell, J, Mancuso, M, Munster, A, Pagliarone, C, Petricca, F, Potzel, W, Probst, F, Puig, R, Reindl, F, Schaffner, K, Schieck, J, Schonert, S, Seidel, W, Stahlberg, M, Stodolsky, L, Strandhagen, C, Strauss, R, Tanzke, A, Thi, H, Turkoglu, C, Uffinger, M, Ulrich, A, Usherov, I, Wawoczny, S, Wustrich, M, Zoller, A, Willers M, Angloher G, Bento A, Bucci C, Canonica L, Defay X, Erb A, von Feilitzsch F, Iachellini NF, Gutlein A, Gorla P, Hauff D, Jochum J, Kiefer M, Kluck H, Kraus H, Lanfranchi JC, Loebell J, Mancuso M, Munster A, Pagliarone C, Petricca F, Potzel W, Probst F, Puig R, Reindl F, Schaffner K, Schieck J, Schonert S, Seidel W, Stahlberg M, Stodolsky L, Strandhagen C, Strauss R, Tanzke A, Thi HHT, Turkoglu C, Uffinger M, Ulrich A, Usherov I, Wawoczny S, Wustrich M, Zoller A, Willers, M, Angloher, G, Bento, A, Bucci, C, Canonica, L, Defay, X, Erb, A, von Feilitzsch, F, Iachellini, N, Gutlein, A, Gorla, P, Hauff, D, Jochum, J, Kiefer, M, Kluck, H, Kraus, H, Lanfranchi, J, Loebell, J, Mancuso, M, Munster, A, Pagliarone, C, Petricca, F, Potzel, W, Probst, F, Puig, R, Reindl, F, Schaffner, K, Schieck, J, Schonert, S, Seidel, W, Stahlberg, M, Stodolsky, L, Strandhagen, C, Strauss, R, Tanzke, A, Thi, H, Turkoglu, C, Uffinger, M, Ulrich, A, Usherov, I, Wawoczny, S, Wustrich, M, Zoller, A, Willers M, Angloher G, Bento A, Bucci C, Canonica L, Defay X, Erb A, von Feilitzsch F, Iachellini NF, Gutlein A, Gorla P, Hauff D, Jochum J, Kiefer M, Kluck H, Kraus H, Lanfranchi JC, Loebell J, Mancuso M, Munster A, Pagliarone C, Petricca F, Potzel W, Probst F, Puig R, Reindl F, Schaffner K, Schieck J, Schonert S, Seidel W, Stahlberg M, Stodolsky L, Strandhagen C, Strauss R, Tanzke A, Thi HHT, Turkoglu C, Uffinger M, Ulrich A, Usherov I, Wawoczny S, Wustrich M, and Zoller A

Abstract

The CRESST-III experiment, located in the Gran Sasso underground laboratory (LNGS, Italy), aims at the direct detection of dark matter (DM) particles. Scintillating CaWO4 crystals operated as cryogenic detectors are used as target material for DM-nucleus scattering. The simultaneous measurement of the phonon signal from the CaWO4 crystal and of the emitted scintillation light in a separate cryogenic light detector is used to discriminate backgrounds from a possible dark matter signal. The experiment aims to significantly improve the sensitivity for low-mass (less than or similar to 5-10 GeV/c(2)) DM particles by using optimized detector modules with a nuclear recoil-energy threshold less than or similar to 100 eV. The current status of the experiment as well as projections of the sensitivity for spin-independent DM-nucleon scattering will be presented.

Published
2017

39. The CRESST-III low-mass WIMP detector

Author

Strauss, R, Angloher, G, Bento, A, Bucci, C, Canonica, L, Defay, X, Erb, A, von Feilitzsch, F, Iachellini, N, Gorla, P, Gutlein, A, Hauff, D, Jochum, J, Kiefer, M, Kluck, H, Krauss, H, Lanfranchi, J, Loebell, J, Munster, A, Pagliarone, C, Petricca, F, Potzel, W, Probst, F, Reindl, F, Schaffner, K, Schieck, J, Schonert, S, Seidel, W, Stodolsky, L, Strandhagen, C, Tanzke, A, Thi, H, Turkoglu, C, Uffinger, M, Ulrich, A, Usherov, I, Wawoczny, S, Willers, M, Wustrich, M, Zoller, A, Strauss R, Angloher G, Bento A, Bucci C, Canonica L, Defay X, Erb A, von Feilitzsch F, Iachellini NF, Gorla P, Gutlein A, Hauff D, Jochum J, Kiefer M, Kluck H, Krauss H, Lanfranchi JC, Loebell J, Munster A, Pagliarone C, Petricca F, Potzel W, Probst F, Reindl F, Schaffner K, Schieck J, Schonert S, Seidel W, Stodolsky L, Strandhagen C, Tanzke A, Thi HHT, Turkoglu C, Uffinger M, Ulrich A, Usherov I, Wawoczny S, Willers M, Wustrich M, Zoller A, Strauss, R, Angloher, G, Bento, A, Bucci, C, Canonica, L, Defay, X, Erb, A, von Feilitzsch, F, Iachellini, N, Gorla, P, Gutlein, A, Hauff, D, Jochum, J, Kiefer, M, Kluck, H, Krauss, H, Lanfranchi, J, Loebell, J, Munster, A, Pagliarone, C, Petricca, F, Potzel, W, Probst, F, Reindl, F, Schaffner, K, Schieck, J, Schonert, S, Seidel, W, Stodolsky, L, Strandhagen, C, Tanzke, A, Thi, H, Turkoglu, C, Uffinger, M, Ulrich, A, Usherov, I, Wawoczny, S, Willers, M, Wustrich, M, Zoller, A, Strauss R, Angloher G, Bento A, Bucci C, Canonica L, Defay X, Erb A, von Feilitzsch F, Iachellini NF, Gorla P, Gutlein A, Hauff D, Jochum J, Kiefer M, Kluck H, Krauss H, Lanfranchi JC, Loebell J, Munster A, Pagliarone C, Petricca F, Potzel W, Probst F, Reindl F, Schaffner K, Schieck J, Schonert S, Seidel W, Stodolsky L, Strandhagen C, Tanzke A, Thi HHT, Turkoglu C, Uffinger M, Ulrich A, Usherov I, Wawoczny S, Willers M, Wustrich M, and Zoller A

Abstract

The next generation direct dark matter experiment CRESST-III has a high potential to significantly increase the sensitivity to low-mass WIMPs (mx ≲10GeV/c2). We present the new CRESST detector module: it consists of a 24 g CaWO4 crystal operated as a phonon detector and a 20×20 mm2 silicon-on-sapphire light detector. The phonon energy threshold is lowered to ∼100eV and a light detector resolution of typically 5eV is achieved. A fully-scintillating inner detector housing is realised which efficiently rejects events from surface-alpha decays. The CaWO4 sticks holding the target crystal are also operated as calorimeters to discriminate all possible artefacts related to the support structure. A projection for the sensitivity to spin-independent WIMP-nucleon scattering is given for the first phase of CRESST-III which will start beginning of 2016.

Published
2016

40. Exploring Low-Mass Dark Matter with CRESST

Author

Strauss, R, Angloher, G, Bento, A, Bucci, C, Canonica, L, Defay, X, Erb, A, von Feilitzsch, F, Iachellini, N, Gorla, P, Gutlein, A, Hauff, D, Jochum, J, Kiefer, M, Kluck, H, Kraus, H, Lanfranchi, J, Loebell, J, Munster, A, Pagliarone, C, Petricca, F, Potzel, W, Probst, F, Reindl, F, Schaffner, K, Schieck, J, Schonert, S, Seidel, W, Stodolsky, L, Strandhagen, C, Tanzke, A, Thi, H, Turkoglu, C, Uffinger, M, Ulrich, A, Usherov, I, Wawoczny, S, Willers, M, Wustrich, M, Zoller, A, Strauss R, Angloher G, Bento A, Bucci C, Canonica L, Defay X, Erb A, von Feilitzsch F, Iachellini NF, Gorla P, Gutlein A, Hauff D, Jochum J, Kiefer M, Kluck H, Kraus H, Lanfranchi JC, Loebell J, Munster A, Pagliarone C, Petricca F, Potzel W, Probst F, Reindl F, Schaffner K, Schieck J, Schonert S, Seidel W, Stodolsky L, Strandhagen C, Tanzke A, Thi HHT, Turkoglu C, Uffinger M, Ulrich A, Usherov I, Wawoczny S, Willers M, Wustrich M, Zoller A, Strauss, R, Angloher, G, Bento, A, Bucci, C, Canonica, L, Defay, X, Erb, A, von Feilitzsch, F, Iachellini, N, Gorla, P, Gutlein, A, Hauff, D, Jochum, J, Kiefer, M, Kluck, H, Kraus, H, Lanfranchi, J, Loebell, J, Munster, A, Pagliarone, C, Petricca, F, Potzel, W, Probst, F, Reindl, F, Schaffner, K, Schieck, J, Schonert, S, Seidel, W, Stodolsky, L, Strandhagen, C, Tanzke, A, Thi, H, Turkoglu, C, Uffinger, M, Ulrich, A, Usherov, I, Wawoczny, S, Willers, M, Wustrich, M, Zoller, A, Strauss R, Angloher G, Bento A, Bucci C, Canonica L, Defay X, Erb A, von Feilitzsch F, Iachellini NF, Gorla P, Gutlein A, Hauff D, Jochum J, Kiefer M, Kluck H, Kraus H, Lanfranchi JC, Loebell J, Munster A, Pagliarone C, Petricca F, Potzel W, Probst F, Reindl F, Schaffner K, Schieck J, Schonert S, Seidel W, Stodolsky L, Strandhagen C, Tanzke A, Thi HHT, Turkoglu C, Uffinger M, Ulrich A, Usherov I, Wawoczny S, Willers M, Wustrich M, and Zoller A

Abstract

The CRESST-II (Cryogenic Rare Event Search with Superconducting Thermometers) experiment, whose second phase has been successfully finished in summer 2015, aims at the direct detection of dark matter particles. The intrinsic radiopurity of CaWO4 crystals, the capability to reject recoil events from alpha-surface contamination, and the energy threshold were significantly improved compared to previous runs of the experiment. A moderate exposure of 29 kg-days acquired by one ∼ 250 g CaWO4 detector provides competitive limits on the spin-independent dark matter particle-nucleon cross section and probes a new region of parameter space for dark matter particle masses below 3 GeV/c2. The potential for low-mass dark matter particle search can be further exploited by a new detector design planned for CRESST-III. We describe the experimental strategy for the near future and give projections for the sensitivity.

Published
2016

41. Results on light dark matter particles with a low-threshold CRESST-II detector

Author

Angloher, G, Bento, A, Bucci, C, Canonica, L, Defay, X, Erb, A, von Feilitzsch, F, Iachellini, N, Gorla, P, Gutlein, A, Hauff, D, Jochum, J, Kiefer, M, Kluck, H, Kraus, H, Lanfranchi, J, Loebell, J, Munster, A, Pagliarone, C, Petricca, F, Potzel, W, Probst, F, Reindl, F, Schaffner, K, Schieck, J, Schonert, S, Seidel, W, Stodolsky, L, Strandhagen, C, Strauss, R, Tanzke, A, Thi, H, Turkoglu, C, Uffinger, M, Ulrich, A, Usherov, I, Wawoczny, S, Willers, M, Wustrich, M, Zoller, A, Angloher G, Bento A, Bucci C, Canonica L, Defay X, Erb A, von Feilitzsch F, Iachellini NF, Gorla P, Gutlein A, Hauff D, Jochum J, Kiefer M, Kluck H, Kraus H, Lanfranchi JC, Loebell J, Munster A, Pagliarone C, Petricca F, Potzel W, Probst F, Reindl F, Schaffner K, Schieck J, Schonert S, Seidel W, Stodolsky L, Strandhagen C, Strauss R, Tanzke A, Thi HHT, Turkoglu C, Uffinger M, Ulrich A, Usherov I, Wawoczny S, Willers M, Wustrich M, Zoller A, Angloher, G, Bento, A, Bucci, C, Canonica, L, Defay, X, Erb, A, von Feilitzsch, F, Iachellini, N, Gorla, P, Gutlein, A, Hauff, D, Jochum, J, Kiefer, M, Kluck, H, Kraus, H, Lanfranchi, J, Loebell, J, Munster, A, Pagliarone, C, Petricca, F, Potzel, W, Probst, F, Reindl, F, Schaffner, K, Schieck, J, Schonert, S, Seidel, W, Stodolsky, L, Strandhagen, C, Strauss, R, Tanzke, A, Thi, H, Turkoglu, C, Uffinger, M, Ulrich, A, Usherov, I, Wawoczny, S, Willers, M, Wustrich, M, Zoller, A, Angloher G, Bento A, Bucci C, Canonica L, Defay X, Erb A, von Feilitzsch F, Iachellini NF, Gorla P, Gutlein A, Hauff D, Jochum J, Kiefer M, Kluck H, Kraus H, Lanfranchi JC, Loebell J, Munster A, Pagliarone C, Petricca F, Potzel W, Probst F, Reindl F, Schaffner K, Schieck J, Schonert S, Seidel W, Stodolsky L, Strandhagen C, Strauss R, Tanzke A, Thi HHT, Turkoglu C, Uffinger M, Ulrich A, Usherov I, Wawoczny S, Willers M, Wustrich M, and Zoller A

Abstract

The CRESST-II experiment uses cryogenic detectors to search for nuclear recoil events induced by the elastic scattering of dark matter particles in CaWO4 crystals. Given the low energy threshold of our detectors in combination with light target nuclei, low mass dark matter particles can be probed with high sensitivity. In this letter we present the results from data of a single detector module corresponding to 52 kg live days. A blind analysis is carried out. With an energy threshold for nuclear recoils of 307 eV we substantially enhance the sensitivity for light dark matter. Thereby, we extend the reach of direct dark matter experiments to the sub- GeV/c2 region and demonstrate that the energy threshold is the key parameter in the search for low mass dark matter particles.

Published
2016

42. In-situ study of light production and transport in phonon light detector modules for dark matter search

Author

Kiefer, M, Angloher, G, Bento, A, Bucci, C, Canonica, L, Erb, A, von Feilitzsch, F, Ferreiroiachellini, N, Gorla, P, Gutlein, A, Hauff, D, Jochum, J, Kluck, H, Kraus, H, Lanfranchi, J, Loebell, J, Munster, A, Petricca, F, Potzel, W, Probst, F, Reindl, F, Roth, S, Rottler, K, Sailer, C, Schaffner, K, Schieck, J, Schonert, S, Seidel, W, von Sivers, M, Stodolsky, L, Strandhagen, C, Strauss, R, Tanzke, A, Turkoglu, C, Uffinger, M, Ulrich, A, Usherov, I, Wawoczny, S, Willers, M, Wustrich, M, Zoller, A, Kiefer M, Angloher G, Bento A, Bucci C, Canonica L, Erb A, von Feilitzsch F, FerreiroIachellini N, Gorla P, Gutlein A, Hauff D, Jochum J, Kluck H, Kraus H, Lanfranchi JC, Loebell J, Munster A, Petricca F, Potzel W, Probst F, Reindl F, Roth S, Rottler K, Sailer C, Schaffner K, Schieck J, Schonert S, Seidel W, von Sivers M, Stodolsky L, Strandhagen C, Strauss R, Tanzke A, Turkoglu C, Uffinger M, Ulrich A, Usherov I, Wawoczny S, Willers M, Wustrich M, Zoller A, Kiefer, M, Angloher, G, Bento, A, Bucci, C, Canonica, L, Erb, A, von Feilitzsch, F, Ferreiroiachellini, N, Gorla, P, Gutlein, A, Hauff, D, Jochum, J, Kluck, H, Kraus, H, Lanfranchi, J, Loebell, J, Munster, A, Petricca, F, Potzel, W, Probst, F, Reindl, F, Roth, S, Rottler, K, Sailer, C, Schaffner, K, Schieck, J, Schonert, S, Seidel, W, von Sivers, M, Stodolsky, L, Strandhagen, C, Strauss, R, Tanzke, A, Turkoglu, C, Uffinger, M, Ulrich, A, Usherov, I, Wawoczny, S, Willers, M, Wustrich, M, Zoller, A, Kiefer M, Angloher G, Bento A, Bucci C, Canonica L, Erb A, von Feilitzsch F, FerreiroIachellini N, Gorla P, Gutlein A, Hauff D, Jochum J, Kluck H, Kraus H, Lanfranchi JC, Loebell J, Munster A, Petricca F, Potzel W, Probst F, Reindl F, Roth S, Rottler K, Sailer C, Schaffner K, Schieck J, Schonert S, Seidel W, von Sivers M, Stodolsky L, Strandhagen C, Strauss R, Tanzke A, Turkoglu C, Uffinger M, Ulrich A, Usherov I, Wawoczny S, Willers M, Wustrich M, and Zoller A

Abstract

The CRESST experiment (Cryogenic Rare Event Search with Superconducting Thermometers) searches for dark matter via the phonon and light signals of elastic scattering processes in scintillating crystals. The discrimination between a possible dark matter signal and background is based on the light yield. We present a new method for evaluating the two characteristics of a phonon/light detector module that determine how much of the deposited energy is converted to scintillation light and how efficiently a module detects the produced light. In contrast to former approaches with dedicated setups, we developed a method which allows us to use data taken with the cryogenic setup, during a dark matter search phase. In this way, we accounted for the entire process that occurs in a detector module, and obtained information on the light emission of the crystal as well as information on the performance of the module (light transport and detection). We found that with the detectors operated in CRESST-II phase 1, about 20% of the produced scintillation light is detected. A part of the light is likely absorbed by creating meta-stable excitations in the scintillating crystals. The light not detected is not absorbed entirely, as an additional light detector can help to increase the fraction of detected light.

Published
2016

43. New results on low-mass dark matter from the CRESST-II experiment

Author

Petricca, F, Angloher, G, Bento, A, Bucci, C, Canonica, L, Defay, X, Erb, A, Feilitzsch, F, Iachellini, N, Gorla, P, Gutlein, A, Hauff, D, Jochum, J, Kiefer, M, Kluck, H, Kraus, H, Lanfranchi, J, Loebell, J, Munster, A, Pagliarone, C, Potzel, W, Probst, F, Reindl, F, Schaffner, K, Schieck, J, Schonert, S, Seidel, W, Stodolsky, L, Strandhagen, C, Strauss, R, Tanzke, A, Thi, H, Turkoglu, C, Uffinger, M, Ulrich, A, Usherov, I, Wawoczny, S, Willers, M, Wustrich, M, Zoller, A, Petricca F, Angloher G, Bento A, Bucci C, Canonica L, Defay X, Erb A, Feilitzsch FV, Iachellini NF, Gorla P, Gutlein A, Hauff D, Jochum J, Kiefer M, Kluck H, Kraus H, Lanfranchi JC, Loebell J, Munster A, Pagliarone C, Potzel W, Probst F, Reindl F, Schaffner K, Schieck J, Schonert S, Seidel W, Stodolsky L, Strandhagen C, Strauss R, Tanzke A, Thi HHT, Turkoglu C, Uffinger M, Ulrich A, Usherov I, Wawoczny S, Willers M, Wustrich M, Zoller A, Petricca, F, Angloher, G, Bento, A, Bucci, C, Canonica, L, Defay, X, Erb, A, Feilitzsch, F, Iachellini, N, Gorla, P, Gutlein, A, Hauff, D, Jochum, J, Kiefer, M, Kluck, H, Kraus, H, Lanfranchi, J, Loebell, J, Munster, A, Pagliarone, C, Potzel, W, Probst, F, Reindl, F, Schaffner, K, Schieck, J, Schonert, S, Seidel, W, Stodolsky, L, Strandhagen, C, Strauss, R, Tanzke, A, Thi, H, Turkoglu, C, Uffinger, M, Ulrich, A, Usherov, I, Wawoczny, S, Willers, M, Wustrich, M, Zoller, A, Petricca F, Angloher G, Bento A, Bucci C, Canonica L, Defay X, Erb A, Feilitzsch FV, Iachellini NF, Gorla P, Gutlein A, Hauff D, Jochum J, Kiefer M, Kluck H, Kraus H, Lanfranchi JC, Loebell J, Munster A, Pagliarone C, Potzel W, Probst F, Reindl F, Schaffner K, Schieck J, Schonert S, Seidel W, Stodolsky L, Strandhagen C, Strauss R, Tanzke A, Thi HHT, Turkoglu C, Uffinger M, Ulrich A, Usherov I, Wawoczny S, Willers M, Wustrich M, and Zoller A

Abstract

The CRESST-II experiment is searching for dark matter particles via their elastic scattering off nuclei in a target material. The CRESST target consists of scintillating CaW04 crystals which are operated as cryogenic calorimeters at millikelvin temperatures and read out by transition edge sensors. Each interaction in the CaW04 target crystal produces a phonon signal and also a light signal that is measured by a secondary cryogenic calorimeter. The low energy thresholds of these detectors, combined with the presence of light nuclei in the target material, allow to probe the low-mass region of the parameter space for spin-independent dark matter-nucleon scattering with high sensitivity. In this contribution results from a blind analysis of one detector module operated in the latest measurement campaign are presented. An unprecedented sensitivity for the light dark matter has been obtained with 52kg live days and a threshold of 307eV for nuclear recoils, extending the reach of direct dark matter searches to the sub-GeV/c2 region.

Published
2016

44. New limits on double electron capture of Ca-40 and W-180

Author

Angloher, G, Bauer, M, Bauer, P, Bavykina, I, Bento, A, Bucci, C, Canonica, L, Ciemniak, C, Defay, X, Deuter, G, Erb, A, von Feilitzsch, F, Iachellini, N, Gorla, P, Gutlein, A, Hauff, D, Huff, P, Isaila, C, Jochum, J, Kiefer, M, Kimmerle, M, Kluck, H, Kraus, H, Lanfranchi, J, Loebell, J, Munster, A, Pagliarone, C, Petricca, F, Pfister, S, Potzel, W, Probst, F, Reindl, F, Roth, S, Rottler, K, Sailer, C, Schaffner, K, Schieck, J, Schmaler, J, Scholl, S, Schonert, S, Seidel, W, von Sivers, M, Stodolsky, L, Strandhagen, C, Strauss, R, Tanzke, A, Tretyak, V, Thi, H, Turkoglu, C, Uffinger, M, Ulrich, A, Usherov, I, Wawoczny, S, Willers, M, Wustrich, M, Zoller, A, Angloher G, Bauer M, Bauer P, Bavykina I, Bento A, Bucci C, Canonica L, Ciemniak C, Defay X, Deuter G, Erb A, von Feilitzsch F, Iachellini NF, Gorla P, Gutlein A, Hauff D, Huff P, Isaila C, Jochum J, Kiefer M, Kimmerle M, Kluck H, Kraus H, Lanfranchi JC, Loebell J, Munster A, Pagliarone C, Petricca F, Pfister S, Potzel W, Probst F, Reindl F, Roth S, Rottler K, Sailer C, Schaffner K, Schieck J, Schmaler J, Scholl S, Schonert S, Seidel W, von Sivers M, Stodolsky L, Strandhagen C, Strauss R, Tanzke A, Tretyak V, Thi HHT, Turkoglu C, Uffinger M, Ulrich A, Usherov I, Wawoczny S, Willers M, Wustrich M, Zoller A, Angloher, G, Bauer, M, Bauer, P, Bavykina, I, Bento, A, Bucci, C, Canonica, L, Ciemniak, C, Defay, X, Deuter, G, Erb, A, von Feilitzsch, F, Iachellini, N, Gorla, P, Gutlein, A, Hauff, D, Huff, P, Isaila, C, Jochum, J, Kiefer, M, Kimmerle, M, Kluck, H, Kraus, H, Lanfranchi, J, Loebell, J, Munster, A, Pagliarone, C, Petricca, F, Pfister, S, Potzel, W, Probst, F, Reindl, F, Roth, S, Rottler, K, Sailer, C, Schaffner, K, Schieck, J, Schmaler, J, Scholl, S, Schonert, S, Seidel, W, von Sivers, M, Stodolsky, L, Strandhagen, C, Strauss, R, Tanzke, A, Tretyak, V, Thi, H, Turkoglu, C, Uffinger, M, Ulrich, A, Usherov, I, Wawoczny, S, Willers, M, Wustrich, M, Zoller, A, Angloher G, Bauer M, Bauer P, Bavykina I, Bento A, Bucci C, Canonica L, Ciemniak C, Defay X, Deuter G, Erb A, von Feilitzsch F, Iachellini NF, Gorla P, Gutlein A, Hauff D, Huff P, Isaila C, Jochum J, Kiefer M, Kimmerle M, Kluck H, Kraus H, Lanfranchi JC, Loebell J, Munster A, Pagliarone C, Petricca F, Pfister S, Potzel W, Probst F, Reindl F, Roth S, Rottler K, Sailer C, Schaffner K, Schieck J, Schmaler J, Scholl S, Schonert S, Seidel W, von Sivers M, Stodolsky L, Strandhagen C, Strauss R, Tanzke A, Tretyak V, Thi HHT, Turkoglu C, Uffinger M, Ulrich A, Usherov I, Wawoczny S, Willers M, Wustrich M, and Zoller A

Abstract

We analyzed low-background data from the CRESST-II experiment with a total net exposure of 730 kg days to extract limits on double electron capture processes. We established new limits for 40Ca with T1/2 2v2K > 9.9 × 1021 y and T1/2 0v2EC > 1.4 × 1022 y and for 180W T1/2 2v/2K > 3.1 × 1019 with y and T1/2 0v2ED > 9.4 × 1018 y at 90% CL. Depending on the process, these values improve the currently best limits by a factor of ∼1.4-30.

Published
2016

45. Limits on Momentum-Dependent Asymmetric Dark Matter with CRESST-II

Author

Angloher, G, Bento, A, Bucci, C, Canonica, L, Defay, X, Erb, A, von Feilitzsch, F, Iachellini, N, Gorla, P, Gutlein, A, Hauff, D, Jochum, J, Kiefer, M, Kluck, H, Kraus, H, Lanfranchi, J, Loebell, J, Munster, A, Pagliarone, C, Petricca, F, Potzel, W, Probst, F, Reindl, F, Schaffner, K, Schieck, J, Schonert, S, Seidel, W, Stodolsky, L, Strandhagen, C, Strauss, R, Tanzke, A, Thi, H, Turkoglu, C, Uffinger, M, Ulrich, A, Usherov, I, Wawoczny, S, Willers, M, Wustrich, M, Zoller, A, Angloher G, Bento A, Bucci C, Canonica L, Defay X, Erb A, von Feilitzsch F, Iachellini NF, Gorla P, Gutlein A, Hauff D, Jochum J, Kiefer M, Kluck H, Kraus H, Lanfranchi JC, Loebell J, Munster A, Pagliarone C, Petricca F, Potzel W, Probst F, Reindl F, Schaffner K, Schieck J, Schonert S, Seidel W, Stodolsky L, Strandhagen C, Strauss R, Tanzke A, Thi HHT, Turkoglu C, Uffinger M, Ulrich A, Usherov I, Wawoczny S, Willers M, Wustrich M, Zoller A, Angloher, G, Bento, A, Bucci, C, Canonica, L, Defay, X, Erb, A, von Feilitzsch, F, Iachellini, N, Gorla, P, Gutlein, A, Hauff, D, Jochum, J, Kiefer, M, Kluck, H, Kraus, H, Lanfranchi, J, Loebell, J, Munster, A, Pagliarone, C, Petricca, F, Potzel, W, Probst, F, Reindl, F, Schaffner, K, Schieck, J, Schonert, S, Seidel, W, Stodolsky, L, Strandhagen, C, Strauss, R, Tanzke, A, Thi, H, Turkoglu, C, Uffinger, M, Ulrich, A, Usherov, I, Wawoczny, S, Willers, M, Wustrich, M, Zoller, A, Angloher G, Bento A, Bucci C, Canonica L, Defay X, Erb A, von Feilitzsch F, Iachellini NF, Gorla P, Gutlein A, Hauff D, Jochum J, Kiefer M, Kluck H, Kraus H, Lanfranchi JC, Loebell J, Munster A, Pagliarone C, Petricca F, Potzel W, Probst F, Reindl F, Schaffner K, Schieck J, Schonert S, Seidel W, Stodolsky L, Strandhagen C, Strauss R, Tanzke A, Thi HHT, Turkoglu C, Uffinger M, Ulrich A, Usherov I, Wawoczny S, Willers M, Wustrich M, and Zoller A

Abstract

The usual assumption in direct dark matter searches is to consider only the spin-dependent or spin-independent scattering of dark matter particles. However, especially in models with light dark matter particles O(GeV/c2), operators which carry additional powers of the momentum transfer q2 can become dominant. One such model based on asymmetric dark matter has been invoked to overcome discrepancies in helioseismology and an indication was found for a particle with a preferred mass of 3 GeV/c2 and a cross section of 10-37 cm2. Recent data from the CRESST-II experiment, which uses cryogenic detectors based on CaWO4 to search for nuclear recoils induced by dark matter particles, are used to constrain these momentum-dependent models. The low energy threshold of 307 eV for nuclear recoils of the detector used, allows us to rule out the proposed best fit value above.

Published
2016

46. A Low Nuclear Recoil Energy Threshold for Dark Matter Search with CRESST-III Detectors

Author

Massachusetts Institute of Technology. Department of Physics, Massachusetts Institute of Technology. Laboratory for Nuclear Science, Canonica, Lucia, Mancuso, M., Angloher, G., Bauer, P., Bento, A., Bucci, C., D’Addabbo, A., Defay, X., Erb, A., von Feilitzsch, Franz, Ferreiro Iachellini, N., Gorla, P., Gütlein, A., Hauff, D., Jochum, J., Kiefer, M., Kluck, H., Kraus, H., Lanfranchi, J. C, Langenkämper, A., Loebell, J., Mondragon, E., Münster, A., Pagliarone, C., Petricca, F., Potzel, W., Pröbst, F., Puig, R., Reindl, F., Rothe, J., Schäffner, K., Schieck, J., Schipperges, V., Schönert, S., Seidel, W., Stahlberg, M., Stodolsky, L., Strandhagen, C., Strauss, R., Tanzke, A., Thi, H. H T, Türkoglu, C., Uffinger, M., Ulrich, A., Usherov, I., Wawoczny, S., Willers, M., Wüstrich, M., Massachusetts Institute of Technology. Department of Physics, Massachusetts Institute of Technology. Laboratory for Nuclear Science, Canonica, Lucia, Mancuso, M., Angloher, G., Bauer, P., Bento, A., Bucci, C., D’Addabbo, A., Defay, X., Erb, A., von Feilitzsch, Franz, Ferreiro Iachellini, N., Gorla, P., Gütlein, A., Hauff, D., Jochum, J., Kiefer, M., Kluck, H., Kraus, H., Lanfranchi, J. C, Langenkämper, A., Loebell, J., Mondragon, E., Münster, A., Pagliarone, C., Petricca, F., Potzel, W., Pröbst, F., Puig, R., Reindl, F., Rothe, J., Schäffner, K., Schieck, J., Schipperges, V., Schönert, S., Seidel, W., Stahlberg, M., Stodolsky, L., Strandhagen, C., Strauss, R., Tanzke, A., Thi, H. H T, Türkoglu, C., Uffinger, M., Ulrich, A., Usherov, I., Wawoczny, S., Willers, M., and Wüstrich, M.

Abstract

The CRESST-III experiment (Cryogenic Rare Events Search with Superconducting Thermometers), located at the underground facility Laboratori Nazionali del Gran Sasso in Italy, uses scintillating CaWO₄ crystals as cryogenic calorimeters to search for direct dark matter interactions in detectors. A large part of the parameter space for spin-independent scattering off nuclei remains untested for dark matter particles with masses below a few GeV/c², despite many naturally motivated theoretical models for light dark matter particles. The CRESST-III detectors are designed to achieve the performance required to probe the low-mass region of the parameter space with a sensitivity never reached before. In this paper, new results on the performance and an overview of the CRESST-III detectors will be presented, emphasizing the results about the low-energy threshold for nuclear recoil of CRESST-III Phase 1 which started collecting data in August 2016. Keywords: Cryogenic detectors; Dark matter; Rare-event searches

Published
2018

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

Author

Strauss, R, Angloher, G, Bento, A, Bucci, C, Canonica, L, Erb, A, Feilitzsch, F, Iachellini, N, Gorla, P, Gutlein, A, Hauff, D, Jochum, J, Kiefer, M, Kluck, H, Kraus, H, Lanfranchi, J, Loebell, J, Munster, A, Petricca, F, Potzel, W, Probst, F, Reindl, F, Roth, S, Rottler, K, Sailer, C, Schaffner, K, Schieck, J, Scholl, S, Schonert, S, Seidel, W, Sivers, M, Stodolsky, L, Strandhagen, C, Tanzke, A, Uffinger, M, Ulrich, A, Usherov, I, Wawoczny, S, Willers, M, Wustrich, M, Zoller, A, Strauss R, Angloher G, Bento A, Bucci C, Canonica L, Erb A, Feilitzsch FV, Iachellini NF, Gorla P, Gutlein A, Hauff D, Jochum J, Kiefer M, Kluck H, Kraus H, Lanfranchi JC, Loebell J, Munster A, Petricca F, Potzel W, Probst F, Reindl F, Roth S, Rottler K, Sailer C, Schaffner K, Schieck J, Scholl S, Schonert S, Seidel W, Sivers MV, Stodolsky L, Strandhagen C, Tanzke A, Uffinger M, Ulrich A, Usherov I, Wawoczny S, Willers M, Wustrich M, Zoller A, Strauss, R, Angloher, G, Bento, A, Bucci, C, Canonica, L, Erb, A, Feilitzsch, F, Iachellini, N, Gorla, P, Gutlein, A, Hauff, D, Jochum, J, Kiefer, M, Kluck, H, Kraus, H, Lanfranchi, J, Loebell, J, Munster, A, Petricca, F, Potzel, W, Probst, F, Reindl, F, Roth, S, Rottler, K, Sailer, C, Schaffner, K, Schieck, J, Scholl, S, Schonert, S, Seidel, W, Sivers, M, Stodolsky, L, Strandhagen, C, Tanzke, A, Uffinger, M, Ulrich, A, Usherov, I, Wawoczny, S, Willers, M, Wustrich, M, Zoller, A, Strauss R, Angloher G, Bento A, Bucci C, Canonica L, Erb A, Feilitzsch FV, Iachellini NF, Gorla P, Gutlein A, Hauff D, Jochum J, Kiefer M, Kluck H, Kraus H, Lanfranchi JC, Loebell J, Munster A, Petricca F, Potzel W, Probst F, Reindl F, Roth S, Rottler K, Sailer C, Schaffner K, Schieck J, Scholl S, Schonert S, Seidel W, Sivers MV, Stodolsky L, Strandhagen C, Tanzke A, Uffinger M, Ulrich A, Usherov I, Wawoczny S, Willers M, Wustrich M, and Zoller A

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 WIMP-nucleon 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 CaWO4 crystal, called TUM40, grown at the Technische Universitat Munchen. 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.

Published
2015

48. Impact of coherent neutrino nucleus scattering on direct dark matter searches based on CaWO4 crystals

Author

Gutlein, A, Angloher, G, Bento, A, Bucci, C, Canonica, L, Erb, A, von Feilitzsch, F, Iachellini, N, Gorla, P, Hauff, D, Jochum, J, Kiefer, M, Kluck, H, Kraus, H, Lanfranchi, J, Loebell, J, Munster, A, Petricca, F, Potzel, W, Proebst, F, Reindl, F, Roth, S, Rottler, K, Sailer, C, Schaeffner, K, Schieck, J, Schonert, S, Seidel, W, von Sivers, M, Stodolsky, L, Strandhagen, C, Strauss, R, Tanzke, A, Uffinger, M, Ulrich, A, Usherov, I, Wawoczny, S, Willers, M, Wustrich, M, Zoller, A, Gutlein A, Angloher G, Bento A, Bucci C, Canonica L, Erb A, von Feilitzsch F, Iachellini NF, Gorla P, Hauff D, Jochum J, Kiefer M, Kluck H, Kraus H, Lanfranchi JC, Loebell J, Munster A, Petricca F, Potzel W, Proebst F, Reindl F, Roth S, Rottler K, Sailer C, Schaeffner K, Schieck J, Schonert S, Seidel W, von Sivers M, Stodolsky L, Strandhagen C, Strauss R, Tanzke A, Uffinger M, Ulrich A, Usherov I, Wawoczny S, Willers M, Wustrich M, Zoller A, Gutlein, A, Angloher, G, Bento, A, Bucci, C, Canonica, L, Erb, A, von Feilitzsch, F, Iachellini, N, Gorla, P, Hauff, D, Jochum, J, Kiefer, M, Kluck, H, Kraus, H, Lanfranchi, J, Loebell, J, Munster, A, Petricca, F, Potzel, W, Proebst, F, Reindl, F, Roth, S, Rottler, K, Sailer, C, Schaeffner, K, Schieck, J, Schonert, S, Seidel, W, von Sivers, M, Stodolsky, L, Strandhagen, C, Strauss, R, Tanzke, A, Uffinger, M, Ulrich, A, Usherov, I, Wawoczny, S, Willers, M, Wustrich, M, Zoller, A, Gutlein A, Angloher G, Bento A, Bucci C, Canonica L, Erb A, von Feilitzsch F, Iachellini NF, Gorla P, Hauff D, Jochum J, Kiefer M, Kluck H, Kraus H, Lanfranchi JC, Loebell J, Munster A, Petricca F, Potzel W, Proebst F, Reindl F, Roth S, Rottler K, Sailer C, Schaeffner K, Schieck J, Schonert S, Seidel W, von Sivers M, Stodolsky L, Strandhagen C, Strauss R, Tanzke A, Uffinger M, Ulrich A, Usherov I, Wawoczny S, Willers M, Wustrich M, and Zoller A

Abstract

Atmospheric and solar neutrinos scattering coherently off target nuclei will be an important background source for the next generation of direct dark matter searches. In this work we focus on calcium tungstate as target material. For comparison with existing works we calculate the neutrino floor indicating which sensitivities can be reached before the neutrino background appears. In addition, we investigate the sensitivities of future direct dark matter searches using CRESST-II like detectors. Extending previous works we take into account achievable energy resolutions and thresholds as well as beta and gamma backgrounds for this investigation. We show that an exploration of WIMP-nucleon cross sections below the neutrino floor is possible for exposures of ≳10 kg-years. In the third part we show that a first detection of coherent neutrino nucleus scattering of atmospheric and solar neutrinos using the same detectors and the backgrounds is feasible for exposures of ≳50 kg-years.

Published
2015

49. Energy-dependent light quenching in CaWO4 crystals at mK temperatures

Author

Strauss, R, Angloher, G, Bento, A, Bucci, C, Canonica, L, Carli, W, Erb, A, von Feilitzsch, F, Gorla, P, Gutlein, A, Hauff, D, Hellgartner, D, Jochum, J, Kraus, H, Lanfranchi, J, Loebell, J, Munster, A, Petricca, F, Potzel, W, Probst, F, Reindl, F, Roth, S, Rottler, K, Sailer, C, Schaffner, K, Schieck, J, Scholl, S, Schonert, S, Seidel, W, von Sivers, M, Stodolsky, L, Strandhagen, C, Tanzke, A, Uffinger, M, Ulrich, A, Usherov, I, Wawoczny, S, Willers, M, Wustrich, M, Zoller, A, Strauss R, Angloher G, Bento A, Bucci C, Canonica L, Carli W, Erb A, von Feilitzsch F, Gorla P, Gutlein A, Hauff D, Hellgartner D, Jochum J, Kraus H, Lanfranchi JC, Loebell J, Munster A, Petricca F, Potzel W, Probst F, Reindl F, Roth S, Rottler K, Sailer C, Schaffner K, Schieck J, Scholl S, Schonert S, Seidel W, von Sivers M, Stodolsky L, Strandhagen C, Tanzke A, Uffinger M, Ulrich A, Usherov I, Wawoczny S, Willers M, Wustrich M, Zoller A, Strauss, R, Angloher, G, Bento, A, Bucci, C, Canonica, L, Carli, W, Erb, A, von Feilitzsch, F, Gorla, P, Gutlein, A, Hauff, D, Hellgartner, D, Jochum, J, Kraus, H, Lanfranchi, J, Loebell, J, Munster, A, Petricca, F, Potzel, W, Probst, F, Reindl, F, Roth, S, Rottler, K, Sailer, C, Schaffner, K, Schieck, J, Scholl, S, Schonert, S, Seidel, W, von Sivers, M, Stodolsky, L, Strandhagen, C, Tanzke, A, Uffinger, M, Ulrich, A, Usherov, I, Wawoczny, S, Willers, M, Wustrich, M, Zoller, A, Strauss R, Angloher G, Bento A, Bucci C, Canonica L, Carli W, Erb A, von Feilitzsch F, Gorla P, Gutlein A, Hauff D, Hellgartner D, Jochum J, Kraus H, Lanfranchi JC, Loebell J, Munster A, Petricca F, Potzel W, Probst F, Reindl F, Roth S, Rottler K, Sailer C, Schaffner K, Schieck J, Scholl S, Schonert S, Seidel W, von Sivers M, Stodolsky L, Strandhagen C, Tanzke A, Uffinger M, Ulrich A, Usherov I, Wawoczny S, Willers M, Wustrich M, and Zoller A

Abstract

Scintillating CaWO4 single crystals are a promising multi-element target for rare-event searches and are currently used in the direct dark matter experiment CRESST (Cryogenic Rare Event Search with Superconducting Thermometers). The relative light output of different particle interactions in CaWO4 is quantified by quenching factors (QFs). These are essential for an active background discrimination and the identification of a possible signal induced by weakly interacting massive particles (WIMPs). We present the first precise measurements of the QFs of O, Ca and W at mK temperatures by irradiating a cryogenic detector with a fast neutron beam. A clear energy dependence of the QF of O and, less pronounced, of Ca was observed for the first time. Furthermore, in CRESST neutron-calibration data a variation of the QFs among different CaWO4 single crystals was found. For typical CRESST detectors the QFs in the region-of-interest (10-40 keV) are QF(O)(ROI) = (11.2 +/- 0.5) %, QF(Ca)(ROI) = (5.94 +/- 0.49)% andQF(W)(ROI) = (1.72 +/- 0.21) %. The latest CRESST data (run32) is reanalyzed using these fundamentally new results on light quenching in CaWO4 having moderate influence on the WIMP analysis. Their relevance for future CRESST runs and for the clarification of previously published results of direct dark matter experiments is emphasised.

Published
2014

50. Radiopurity of CaWO4 crystals for direct dark matter search with CRESST and EURECA

Author

Munster, A, Sivers, M, Angloher, G, Bento, A, Bucci, C, Canonica, L, Erb, A, Feilitzsch, F, Gorla, P, Gutlein, A, Hauff, D, Jochum, J, Kraus, H, Lanfranchi, J, Laubenstein, M, Loebell, J, Ortigoza, Y, Petricca, F, Potzel, W, Probst, F, Puimedon, J, Reindl, F, Roth, S, Rottler, K, Sailer, C, Schaffner, K, Schieck, J, Scholl, S, Schonert, S, Seidel, W, Stodolsky, L, Strandhagen, C, Strauss, R, Tanzke, A, Uffinger, M, Ulrich, A, Usherov, I, Wawoczny, S, Willers, M, Wustrich, M, Zoller, A, Munster A, Sivers MV, Angloher G, Bento A, Bucci C, Canonica L, Erb A, Feilitzsch FV, Gorla P, Gutlein A, Hauff D, Jochum J, Kraus H, Lanfranchi JC, Laubenstein M, Loebell J, Ortigoza Y, Petricca F, Potzel W, Probst F, Puimedon J, Reindl F, Roth S, Rottler K, Sailer C, Schaffner K, Schieck J, Scholl S, Schonert S, Seidel W, Stodolsky L, Strandhagen C, Strauss R, Tanzke A, Uffinger M, Ulrich A, Usherov I, Wawoczny S, Willers M, Wustrich M, Zoller A, Munster, A, Sivers, M, Angloher, G, Bento, A, Bucci, C, Canonica, L, Erb, A, Feilitzsch, F, Gorla, P, Gutlein, A, Hauff, D, Jochum, J, Kraus, H, Lanfranchi, J, Laubenstein, M, Loebell, J, Ortigoza, Y, Petricca, F, Potzel, W, Probst, F, Puimedon, J, Reindl, F, Roth, S, Rottler, K, Sailer, C, Schaffner, K, Schieck, J, Scholl, S, Schonert, S, Seidel, W, Stodolsky, L, Strandhagen, C, Strauss, R, Tanzke, A, Uffinger, M, Ulrich, A, Usherov, I, Wawoczny, S, Willers, M, Wustrich, M, Zoller, A, Munster A, Sivers MV, Angloher G, Bento A, Bucci C, Canonica L, Erb A, Feilitzsch FV, Gorla P, Gutlein A, Hauff D, Jochum J, Kraus H, Lanfranchi JC, Laubenstein M, Loebell J, Ortigoza Y, Petricca F, Potzel W, Probst F, Puimedon J, Reindl F, Roth S, Rottler K, Sailer C, Schaffner K, Schieck J, Scholl S, Schonert S, Seidel W, Stodolsky L, Strandhagen C, Strauss R, Tanzke A, Uffinger M, Ulrich A, Usherov I, Wawoczny S, Willers M, Wustrich M, and Zoller A

Abstract

The direct dark matter search experiment CRESST uses scintillating CaWO4 single crystals as targets for possible WIMP scatterings. An intrinsic radioactive contamination of the crystals as low as possible is crucial for the sensitivity of the detectors. In the past CaWO4 crystals operated in CRESST were produced by institutes in Russia and the Ukraine. Since 2011 CaWO4 crystals have also been grown at the crystal laboratory of the Technische Universitat Munchen (TUM) to better meet the requirements of CRESST and of the future tonne-scale multi-material experiment EURECA. The radiopurity of the raw materials and of first TUM-grown crystals was measured by ultra-low background gamma-spectrometry. Two TUM-grown crystals were also operated as low-temperature detectors at a test setup in the Gran Sasso underground laboratory. These measurements were used to determine the crystals' intrinsic alpha-activities which were compared to those of crystals produced at other institutes. The total alpha-activities of TUM-grown crystals as low as 1 : 23 +/- 0 : 06 mBq/kg were found to be significantly smaller than the activities of crystals grown at other institutes typically ranging between similar to 15 mBq/kg and similar to 35 mBq/kg.

Published
2014

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