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44 results on '"F v Feilitzsch"'

1. Constraints on self-interaction cross-sections of dark matter in universal bound states from direct detection

Author

G. Angloher, S. Banik, G. Benato, A. Bento, A. Bertolini, R. Breier, C. Bucci, J. Burkhart, E. Cipelli, L. Canonica, A. D’Addabbo, S. Di Lorenzo, L. Einfalt, A. Erb, F. v. Feilitzsch, S. Fichtinger, D. Fuchs, A. Garai, V. M. Ghete, P. Gorla, P. V. Guillaumon, S. Gupta, D. Hauff, M. Ješkovský, J. Jochum, M. Kaznacheeva, A. Kinast, S. Kuckuk, H. Kluck, H. Kraus, A. Langenkämper, M. Mancuso, L. Marini, B. Mauri, L. Meyer, V. Mokina, M. Olmi, T. Ortmann, C. Pagliarone, L. Pattavina, F. Petricca, W. Potzel, P. Povinec, F. Pröbst, F. Pucci, F. Reindl, J. Rothe, K. Schäffner, J. Schieck, S. Schönert, C. Schwertner, M. Stahlberg, L. Stodolsky, C. Strandhagen, R. Strauss, I. Usherov, F. Wagner, V. Wagner, V. Zema, and CRESST Collaboration

Subjects
Astrophysics, QB460-466, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract

Abstract $$\varLambda $$ Λ -Cold Dark Matter ( $$\varLambda $$ Λ CDM) has been successful at explaining the large-scale structures in the universe but faces severe issues on smaller scales when compared to observations. Introducing self-interactions between dark matter particles claims to provide a solution to the small-scale issues in the $$\varLambda $$ Λ CDM simulations while being consistent with the observations at large scales. The existence of the energy region in which these self-interactions between dark matter particles come close to saturating the S-wave unitarity bound can result in the formation of dark matter bound states called darkonium. In this scenario, all the low energy scattering properties are determined by a single parameter, the inverse scattering length $$\gamma $$ γ . In this work, we set bounds on $$\gamma $$ γ by studying the impact of darkonium on the observations at direct detection experiments using data from CRESST-III and XENON1T. The exclusion limits on $$\gamma $$ γ are then subsequently converted to exclusion limits on the self-interaction cross-section and compared with the constraints from astrophysics and N-body simulations.

Published
2024
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2. DoubleTES detectors to investigate the CRESST low energy background: results from above-ground prototypes

Author

G. Angloher, S. Banik, G. Benato, A. Bento, A. Bertolini, R. Breier, C. Bucci, J. Burkhart, L. Canonica, A. D’Addabbo, S. Di Lorenzo, L. Einfalt, A. Erb, F. v. Feilitzsch, S. Fichtinger, D. Fuchs, A. Garai, V. M. Ghete, P. Gorla, P. V. Guillaumon, S. Gupta, D. Hauff, M. Ješkovský, J. Jochum, M. Kaznacheeva, A. Kinast, H. Kluck, H. Kraus, S. Kuckuk, A. Langenkämper, M. Mancuso, L. Marini, B. Mauri, L. Meyer, V. Mokina, M. Olmi, T. Ortmann, C. Pagliarone, L. Pattavina, F. Petricca, W. Potzel, P. Povinec, F. Pröbst, F. Pucci, F. Reindl, J. Rothe, K. Schäffner, J. Schieck, S. Schönert, C. Schwertner, M. Stahlberg, L. Stodolsky, C. Strandhagen, R. Strauss, I. Usherov, F. Wagner, V. Wagner, V. Zema, and CRESST Collaboration

Subjects
Astrophysics, QB460-466, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract

Abstract In recent times, the sensitivity of low-mass direct dark matter searches has been limited by unknown low energy backgrounds close to the energy threshold of the experiments known as the low energy excess (LEE). The CRESST experiment utilises advanced cryogenic detectors constructed with different types of crystals equipped with Transition Edge Sensors (TESs) to measure signals of nuclear recoils induced by the scattering of dark matter particles in the detector. In CRESST, this low energy background manifests itself as a steeply rising population of events below 200 eV. A novel detector design named doubleTES using two identical TESs on the target crystal was studied to investigate the hypothesis that the events are sensor-related. We present the first results from two such modules, demonstrating their ability to differentiate between events originating from the crystal’s bulk and those occurring in the sensor or in its close proximity.

Published
2024
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3. A likelihood framework for cryogenic scintillating calorimeters used in the CRESST dark matter search

Author

CRESST Collaboration, G. Angloher, S. Banik, G. Benato, A. Bento, A. Bertolini, R. Breier, C. Bucci, J. Burkhart, L. Canonica, A. D’Addabbo, S. Di Lorenzo, L. Einfalt, A. Erb, F. v. Feilitzsch, S. Fichtinger, D. Fuchs, A. Garai, V. M. Ghete, P. Gorla, P. V. Guillaumon, S. Gupta, D. Hauff, M. Ješkovský, J. Jochum, M. Kaznacheeva, A. Kinast, H. Kluck, H. Kraus, S. Kuckuk, A. Langenkämper, M. Mancuso, L. Marini, B. Mauri, L. Meyer, V. Mokina, M. Olmi, T. Ortmann, C. Pagliarone, L. Pattavina, F. Petricca, W. Potzel, P. Povinec, F. Pröbst, F. Pucci, F. Reindl, J. Rothe, K. Schäffner, J. Schieck, D. Schmiedmayer, S. Schönert, C. Schwertner, M. Stahlberg, L. Stodolsky, C. Strandhagen, R. Strauss, I. Usherov, F. Wagner, V. Wagner, and V. Zema

Subjects
Astrophysics, QB460-466, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract

Abstract Cryogenic scintillating calorimeters are ultra- sensitive particle detectors for rare event searches, particularly for the search for dark matter and the measurement of neutrino properties. These detectors are made from scintillating target crystals generating two signals for each particle interaction. The phonon (heat) signal precisely measures the deposited energy independent of the type of interacting particle. The scintillation light signal yields particle discrimination on an event-by-event basis. This paper presents a likelihood framework modeling backgrounds and a potential dark matter signal in the two-dimensional plane spanned by phonon and scintillation light energies. We apply the framework to data from CaWO $$_4$$ 4 -based detectors operated in the CRESST dark matter search. For the first time, a single likelihood framework is used in CRESST to model the data and extract results on dark matter in one step by using a profile likelihood ratio test. Our framework simultaneously fits (neutron) calibration data and physics (background) data and allows combining data from multiple detectors. Although tailored to CaWO $$_4$$ 4 -targets and the CRESST experiment, the framework can easily be expanded to other materials and experiments using scintillating cryogenic calorimeters for dark matter search and neutrino physics.

Published
2024
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4. Light dark matter search using a diamond cryogenic detector

Author

CRESST Collaboration, G. Angloher, S. Banik, G. Benato, A. Bento, A. Bertolini, R. Breier, C. Bucci, J. Burkhart, L. Canonica, A. D’Addabbo, S. Di Lorenzo, L. Einfalt, A. Erb, F. v. Feilitzsch, S. Fichtinger, D. Fuchs, A. Garai, V. M. Ghete, P. Gorla, P. V. Guillaumon, S. Gupta, D. Hauff, M. Jes̆kovský, J. Jochum, M. Kaznacheeva, A. Kinast, H. Kluck, H. Kraus, S. Kuckuk, A. Langenkämper, M. Mancuso, L. Marini, B. Mauri, L. Meyer, V. Mokina, M. Olmi, T. Ortmann, C. Pagliarone, L. Pattavina, F. Petricca, W. Potzel, P. Povinec, F. Pröbst, F. Pucci, F. Reindl, J. Rothe, K. Schäffner, J. Schieck, S. Schönert, C. Schwertner, M. Stahlberg, L. Stodolsky, C. Strandhagen, R. Strauss, I. Usherov, F. Wagner, M. Willers, and V. Zema

Subjects
Astrophysics, QB460-466, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract

Abstract Diamond operated as a cryogenic calorimeter is an excellent target for direct detection of low-mass dark matter candidates. Following the realization of the first low-threshold cryogenic detector that uses diamond as absorber for astroparticle physics applications, we now present the resulting exclusion limits on the elastic spin-independent interaction cross-section of dark matter with diamond. We measured two 0.175 g CVD (Chemical Vapor Deposition) diamond samples, each instrumented with a Transition Edge Sensor made of Tungsten (W-TES). Thanks to the energy threshold of just 16.8 eV of one of the two detectors, we set exclusion limits on the elastic spin-independent interaction of dark matter particles with carbon nuclei down to dark matter masses as low as 0.122 GeV/c $$^2$$ 2 . This work shows the scientific potential of cryogenic detectors made from diamond and lays the foundation for the use of this material as target for direct detection dark matter experiments.

Published
2024
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5. Erratum to: DoubleTES detectors to investigate the CRESST low energy background: results from above-ground prototypes

Author

G. Angloher, S. Banik, G. Benato, A. Bento, A. Bertolini, R. Breier, C. Bucci, J. Burkhart, L. Canonica, A. D’Addabbo, S. Di Lorenzo, L. Einfalt, A. Erb, F. v. Feilitzsch, S. Fichtinger, D. Fuchs, A. Garai, V. M. Ghete, P. Gorla, P. V. Guillaumon, S. Gupta, D. Hauff, M. Ješkovský, J. Jochum, M. Kaznacheeva, A. Kinast, H. Kluck, H. Kraus, S. Kuckuk, A. Langenkämper, M. Mancuso, L. Marini, B. Mauri, L. Meyer, V. Mokina, M. Olmi, T. Ortmann, C. Pagliarone, L. Pattavina, F. Petricca, W. Potzel, P. Povinec, F. Pröbst, F. Pucci, F. Reindl, J. Rothe, K. Schäffner, J. Schieck, S. Schönert, C. Schwertner, M. Stahlberg, L. Stodolsky, C. Strandhagen, R. Strauss, I. Usherov, F. Wagner, V. Wagner, V. Zema, and CRESST Collaboration

Subjects
Astrophysics, QB460-466, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Published
2024
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6. Optimal Operation of Cryogenic Calorimeters Through Deep Reinforcement Learning.

Author

G. Angloher, S. Banik, G. Benato, A. Bento, A. Bertolini, R. Breier, C. Bucci, J. Burkhart, L. Canonica, Annarita D'Addabbo, S. Di Lorenzo, L. Einfalt, A. Erb, F. v. Feilitzsch, Stephan Fichtinger, D. Fuchs, A. Garai, V. M. Ghete, P. Gorla, P. V. Guillaumon, S. Gupta, D. Hauff, M. Jeskovský, J. Jochum, M. Kaznacheeva, A. Kinast, S. Kuckuk, H. Kluck, H. Kraus, A. Langenkämper, M. Mancuso, L. Marini, B. Mauri, L. Meyer, V. Mokina, K. Niedermayer, M. Olmi, T. Ortmann, C. Pagliarone, L. Pattavina, F. Petricca, W. Potzel, P. Povinec, F. Pröbst, F. Pucci, F. Reindl, J. Rothe, K. Schäffner, Jochen Schieck, S. Schönert, C. Schwertner, M. Stahlberg, L. Stodolsky, C. Strandhagen, R. Strauss, I. Usherov, Felix Wagner 0003, V. Wagner, M. Willers, V. Zema, Clemens Heitzinger, and Wolfgang Waltenberger

Published
2024
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7. Probing spin-dependent dark matter interactions with $$^6$$ 6 Li

Author

G. Angloher, G. Benato, A. Bento, E. Bertoldo, A. Bertolini, R. Breier, C. Bucci, L. Canonica, A. D’Addabbo, S. Di Lorenzo, L. Einfalt, A. Erb, F. v. Feilitzsch, N. Ferreiro Iachellini, S. Fichtinger, D. Fuchs, A. Fuss, A. Garai, V. M. Ghete, P. Gorla, S. Gupta, D. Hauff, M. Ješkovský, J. Jochum, M. Kaznacheeva, A. Kinast, H. Kluck, H. Kraus, A. Langenkämper, M. Mancuso, L. Marini, V. Mokina, A. Nilima, M. Olmi, T. Ortmann, C. Pagliarone, V. Palušová, L. Pattavina, F. Petricca, W. Potzel, P. Povinec, F. Pröbst, F. Pucci, F. Reindl, J. Rothe, K. Schäffner, J. Schieck, D. Schmiedmayer, S. Schönert, C. Schwertner, M. Stahlberg, L. Stodolsky, C. Strandhagen, R. Strauss, I. Usherov, F. Wagner, M. Willers, and V. Zema

Subjects
Astrophysics, QB460-466, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract

Abstract CRESST is one of the most prominent direct detection experiments for dark matter particles with sub-GeV/c $$^2$$ 2 mass. One of the advantages of the CRESST experiment is the possibility to include a large variety of nuclides in the target material used to probe dark matter interactions. In this work, we discuss in particular the interactions of dark matter particles with protons and neutrons of $$^{6}$$ 6 Li. This is now possible thanks to new calculations on nuclear matrix elements of this specific isotope of Li. To show the potential of using this particular nuclide for probing dark matter interactions, we used the data collected previously by a CRESST prototype based on LiAlO $$_2$$ 2 and operated in an above ground test-facility at Max-Planck-Institut für Physik in Munich, Germany. In particular, the inclusion of $$^{6}$$ 6 Li in the limit calculation drastically improves the result obtained for spin-dependent interactions with neutrons in the whole mass range. The improvement is significant, greater than two order of magnitude for dark matter masses below 1 GeV/c $$^2$$ 2 , compared to the limit previously published with the same data.

Published
2022
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8. Characterisation of low background CaWO$_4$ crystals for CRESST-III

Author

A. Kinast, G. Angloher, S. Banik, G. Benato, A. Bento, A. Bertolini, R. Breier, C. Bucci, J. Burkhart, L. Canonica, A. D'Addabbo, S. Di Lorenzo, L. Einfalt, A. Erb, F. v. Feilitzsch, N. Ferreiro Iachellini, S. Fichtinger, D. Fuchs, A. Fuss, A. Garai, V.M. Ghete, S. Gerster, P. Gorla, P.V. Guillaumon, S. Gupta, D. Hauff, M. Ješkovský, J. Jochum, M. Kaznacheeva, H. Kluck, H. Kraus, A. Langenkämper, M. Mancuso, L. Marini, L. Meyer, V. Mokina, A. Nilima, M. Olmi, T. Ortmann, C. Pagliarone, L. Pattavina, F. Petricca, W. Potzel, P. Povinec, F. Pröbst, F. Pucci, F. Reindl, J. Rothe, K. Schäffner, J. Schieck, D. Schmiedmayer, S. Schönert, C. Schwertner, M. Stahlberg, L. Stodolsky, C. Strandhagen, R. Strauss, I. Usherov, F. Wagner, M. Willers, V. Zema (CRESST Collaboration)

Subjects
Physics, QC1-999
Abstract

The CRESST-III experiment aims at the direct detection of dark matter particles via their elastic scattering off nuclei in a scintillating CaWO$_4$ target crystal. For many years CaWO$_4$ crystals have successfully been produced in-house at Technische Universität München with a focus on high radiopurity. To further improve the CaWO$_4$ crystals, an extensive chemical purification of the raw materials has been performed and the crystal TUM93 was produced from this powder. We present results from an $\alpha$-decay rate analysis performed on 344 days of data collected in the ongoing CRESST-III data-taking campaign. The $\alpha$-decay rate could significantly be reduced.

Published
2023
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9. Cryogenic characterization of a $$\hbox {LiAlO}_{2}$$ LiAlO 2 crystal and new results on spin-dependent dark matter interactions with ordinary matter

Author

A. H. Abdelhameed, G. Angloher, P. Bauer, A. Bento, E. Bertoldo, R. Breier, C. Bucci, L. Canonica, A. D’Addabbo, S. Di Lorenzo, A. Erb, F. V. Feilitzsch, N. Ferreiro Iachellini, S. Fichtinger, D. Fuchs, A. Fuss, V. M. Ghete, A. Garai, P. Gorla, D. Hauff, M. Ješkovský, J. Jochum, J. Kaizer, M. Kaznacheeva, A. Kinast, H. Kluck, H. Kraus, A. Langenkämper, M. Mancuso, V. Mokina, E. Mondragon, M. Olmi, T. Ortmann, C. Pagliarone, V. Palušová, L. Pattavina, F. Petricca, W. Potzel, P. Povinec, F. Pröbst, F. Reindl, J. Rothe, K. Schäffner, J. Schieck, V. Schipperges, D. Schmiedmayer, S. Schönert, C. Schwertner, M. Stahlberg, L. Stodolsky, C. Strandhagen, R. Strauss, I. Usherov, F. Wagner, M. Willers, V. Zema, J. Zeman, M. Brützam, and S. Ganschow

Subjects
Dark matter, Cryogenics, Spin-dependent, Lithium, Neutrons, Astrophysics, QB460-466, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract

Abstract In this work, a first cryogenic characterization of a scintillating $$\hbox {LiAlO}_{2}$$ LiAlO 2 single crystal is presented. The results achieved show that this material holds great potential as a target for direct dark matter search experiments. Three different detector modules obtained from one crystal grown at the Leibniz-Institut für Kristallzüchtung (IKZ) have been tested to study different properties at cryogenic temperatures. Firstly, two 2.8 g twin crystals were used to build different detector modules which were operated in an above-ground laboratory at the Max Planck Institute for Physics (MPP) in Munich, Germany. The first detector module was used to study the scintillation properties of $$\hbox {LiAlO}_{2}$$ LiAlO 2 at cryogenic temperatures. The second achieved an energy threshold of ( $$213.02\pm 1.48$$ 213.02 ± 1.48 ) eV which allows setting a competitive limit on the spin-dependent dark matter particle-proton scattering cross section for dark matter particle masses between $$350\,\hbox {MeV/c}^{2}$$ 350 MeV/c 2 and $$1.50\,\hbox {GeV/c}^{2}$$ 1.50 GeV/c 2 . Secondly, a detector module with a 373 g $$\hbox {LiAlO}_{2}$$ LiAlO 2 crystal as the main absorber was tested in an underground facility at the Laboratori Nazionali del Gran Sasso (LNGS): from this measurement it was possible to determine the radiopurity of the crystal and study the feasibility of using this material as a neutron flux monitor for low-background experiments.

Published
2020
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10. Geant4-based electromagnetic background model for the CRESST dark matter experiment

Author

A. H. Abdelhameed, G. Angloher, P. Bauer, A. Bento, E. Bertoldo, R. Breier, C. Bucci, L. Canonica, A. D’Addabbo, S. Di Lorenzo, A. Erb, F. v. Feilitzsch, N. Ferreiro Iachellini, S. Fichtinger, A. Fuss, P. Gorla, D. Hauff, M. Jes̆kovský, J. Jochum, J. Kaizer, A. Kinast, H. Kluck, H. Kraus, A. Langenkämper, M. Mancuso, V. Mokina, E. Mondragón, M. Olmi, T. Ortmann, C. Pagliarone, V. Palus̆ová, L. Pattavina, F. Petricca, W. Potzel, P. Povinec, F. Pröbst, F. Reindl, J. Rothe, K. Schäffner, J. Schieck, V. Schipperges, D. Schmiedmayer, S. Schönert, C. Schwertner, M. Stahlberg, L. Stodolsky, C. Strandhagen, R. Strauss, C. Türkoğlu, I. Usherov, M. Willers, V. Zema, and J. Zeman

Subjects
Astrophysics, QB460-466, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract

Abstract The CRESST (Cryogenic Rare Event Search with Superconducting Thermometers) dark matter search experiment aims for the detection of dark matter particles via elastic scattering off nuclei in $$\mathrm {CaWO_4}$$ CaWO4 crystals. To understand the CRESST electromagnetic background due to the bulk contamination in the employed materials, a model based on Monte Carlo simulations was developed using the Geant4 simulation toolkit. The results of the simulation are applied to the TUM40 detector module of CRESST-II phase 2. We are able to explain up to $$(68 \pm 16)\,\mathrm {\%}$$ (68±16)% of the electromagnetic background in the energy range between 1 and $$40\,\mathrm {keV}$$ 40keV .

Published
2019
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11. First results on sub-GeV spin-dependent dark matter interactions with $$^{7}$$ 7 Li

Author

A. H. Abdelhameed, G. Angloher, P. Bauer, A. Bento, E. Bertoldo, C. Bucci, L. Canonica, A. D’Addabbo, X. Defay, S. Di Lorenzo, A. Erb, F. v. Feilitzsch, N. Ferreiro Iachellini, S. Fichtinger, A. Fuss, P. Gorla, D. Hauff, J. Jochum, A. Kinast, H. Kluck, H. Kraus, A. Langenkämper, M. Mancuso, V. Mokina, E. Mondragon, A. Münster, M. Olmi, T. Ortmann, C. Pagliarone, L. Pattavina, F. Petricca, W. Potzel, F. Pröbst, F. Reindl, J. Rothe, K. Schäffner, J. Schieck, V. Schipperges, D. Schmiedmayer, S. Schönert, C. Schwertner, M. Stahlberg, L. Stodolsky, C. Strandhagen, R. Strauss, C. Türkoğlu, I. Usherov, M. Willers, V. Zema, (THE CRESST Collaboration), M. Chapellier, A. Giuliani, C. Nones, D. V. Poda, V. N. Shlegel, M. Velázquez, and A. S. Zolotarova

Subjects
Astrophysics, QB460-466, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract

Abstract In this work, we want to highlight the potential of lithium as a target for spin-dependent dark matter search in cryogenic experiments, with a special focus on the low-mass region of the parameter space. We operated a prototype detector module based on a $$\hbox {Li}_2\hbox {MoO}_4$$ Li2MoO4 target crystal in an above-ground laboratory. Despite the high background environment, the detector sets a competitive limit on spin-dependent interactions of dark matter particles with protons and neutrons for masses between $$0.8~\hbox {GeV/c}^2$$ 0.8GeV/c2 and $$1.5~\hbox {GeV/c}^2$$ 1.5GeV/c2 .

Published
2019
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12. EXCESS workshop: Descriptions of rising low-energy spectra

Author

P. Adari, A. Aguilar-Arevalo, D. Amidei, G. Angloher, E. Armengaud, C. Augier, L. Balogh, S. Banik, D. Baxter, C. Beaufort, G. Beaulieu, V. Belov, Y. Ben Gal, G. Benato, A. Benoît, A. Bento, L. Bergé, A. Bertolini, R. Bhattacharyya, J. Billard, I.M. Bloch, A. Botti, R. Breier, G. Bres, J-.L. Bret, A. Broniatowski, A. Brossard, C. Bucci, R. Bunker, M. Cababie, M. Calvo, P. Camus, G. Cancelo, L. Canonica, F. Cappella, L. Cardani, J.-F. Caron, N. Casali, G.del Castello, A. Cazes, R. Cerulli, B.A. Cervantes Vergara, D. Chaize, M. Chapellier, L. Chaplinsky, F. Charlieux, M. Chaudhuri, A.E. Chavarria, G. Chemin, R. Chen, H. Chen, F. Chierchie, I. Colantoni, J. Colas, J. Cooley, J.-M. Coquillat, E.C. Corcoran, S. Crawford, M. Crisler, A. Cruciani, P. Cushman, A. D'Addabbo, J.C. D'Olivo, A. Dastgheibi-Fard, M. De Jésus, Y. Deng, J.B. Dent, E.L. Depaoli, K. Dering, S. Dharani, S. Di Lorenzo, A. Drlica-Wagner, L. Dumoulin, D. Durnford, B. Dutta, L. Einfalt, A. Erb, A. Erhart, R. Essig, J. Estrada, E. Etzion, O. Exshaw, F. Favela-Perez, F. v. Feilitzsch, G. Fernandez Moroni, N. Ferreiro Iachellini, S. Ferriol, S. Fichtinger, E. Figueroa-Feliciano, J.-B. Filippini, D. Filosofov, J. A. Formaggio, M. Friedl, S. Fuard, D. Fuchs, A. Fuss, R. Gaïor, A. Garai, C. Garrah, J. Gascon , G. Gerbier, M. Ghaith, V.M. Ghete, D. Gift, I. Giomataris, G. Giroux, A. Giuliani, P. Gorel, P. Gorla, C. Goupy, J. Goupy, C. Goy, M. Gros, P. Gros, Y. Guardincerri, C. Guerin, V. Guidi, O. Guillaudin, S. Gupta, E. Guy, P. Harrington, D. Hauff, S. T. Heine, S. A. Hertel, S.E. Holland, Z. Hong, E.W. Hoppe, T.W. Hossbach, J.-C. Ianigro, V. Iyer, A. Jastram, M. Ješkovský, Y. Jin, J. Jochum, J. P. Johnston, A. Juillard, D. Karaivanov, V. Kashyap, I. Katsioulas, S. Kazarcev, M. Kaznacheeva, F. Kelly, B. Kilminster, A. Kinast, L. Klinkenberg, H. Kluck, P. Knights, Y. Korn, H. Kraus, B. von Krosigk, A. Kubik, N.A. Kurinsky, J. Lamblin, A. Langenkämper, S. Langrock, T. Lasserre, H. Lattaud, P. Lautridou, I. Lawson, S.J. Lee, M. Lee, A. Letessier-Selvon, D. Lhuillier, M. Li, Y.-T. Lin, A. Lubashevskiy, R. Mahapatra, S. Maludze, M. Mancuso, I. Manthos, L. Marini, S. Marnieros, R.D. Martin, A. Matalon, J. Matthews, B. Mauri, D. W. Mayer, A. Mazzolari, E. Mazzucato, H. Meyer zu Theenhausen, E. Michielin, J. Minet, N. Mirabolfathi, K. v. Mirbach, D. Misiak, P. Mitra, J-.L. Mocellin, B. Mohanty, V. Mokina, J.-P. Mols, A. Monfardini, F. Mounier, S. Munagavalasa, J.-F. Muraz, X.-F. Navick, T. Neep, H. Neog, H. Neyrial, K. Nikolopoulos, A. Nilima, C. Nones, V. Novati, P. O'Brien, L. Oberauer, E. Olivieri, M. Olmi, A. Onillon, C. Oriol, A. Orly, J.L. Orrell, T. Ortmann, C.T. Overman, C. Pagliarone, V. Palušová, P. Pari, P. K. Patel, L. Pattavina, F. Petricca, A. Piers, H. D. Pinckney, M.-C. Piro, M. Platt, D. Poda, D. Ponomarev, W. Potzel, P. Povinec, F. Pröbst, P. Privitera, F. Pucci, K. Ramanathan, J.-S. Real, T. Redon, F. Reindl, R. Ren, A. Robert, J.Da Rocha, D. Rodrigues, R. Rogly, J. Rothe, N. Rowe, S. Rozov, I. Rozova, T. Saab, N. Saffold, T. Salagnac, J. Sander, V. Sanglard, D. Santos, Y. Sarkis, V. Savu, G. Savvidis, I. Savvidis, S. Schönert, K. Schäffner, N. Schermer, J. Schieck, B. Schmidt, D. Schmiedmayer, C. Schwertner, L. Scola, M. Settimo, Ye. Shevchik, V. Sibille, I. Sidelnik, A. Singal, R. Smida, M. Sofo Haro, T. Soldner, J. Stachurska, M. Stahlberg, L. Stefanazzi, L. Stodolsky, C. Strandhagen, R. Strauss, A. Stutz, R. Thomas, A. Thompson, J. Tiffenberg, C. Tomei, M. Traina, S. Uemura, I. Usherov, L. Vagneron, W. Van De Pontseele, F.A. Vazquez de Sola Fernandez, M. Vidal, M. Vignati, A.L. Virto, M. Vivier, T. Volansky, V. Wagner, F. Wagner, J. Walker, R. Ward, S.L. Watkins, A. Wex, M. Willers, M.J. Wilson, L. Winslow, E. Yakushev, T.-T. Yu, M. Zampaolo, A. Zaytsev, V. Zema, D. Zinatulina, A. Zolotarova

Subjects
Physics, QC1-999
Abstract

Many low-threshold experiments observe sharply rising event rates of yet unknown origins below a few hundred eV, and larger than expected from known backgrounds. Due to the significant impact of this excess on the dark matter or neutrino sensitivity of these experiments, a collective effort has been started to share the knowledge about the individual observations. For this, the EXCESS Workshop was initiated. In its first iteration in June 2021, ten rare event search collaborations contributed to this initiative via talks and discussions. The contributing collaborations were CONNIE, CRESST, DAMIC, EDELWEISS, MINER, NEWS-G, NUCLEUS, RICOCHET, SENSEI and SuperCDMS. They presented data about their observed energy spectra and known backgrounds together with details about the respective measurements. In this paper, we summarize the presented information and give a comprehensive overview of the similarities and differences between the distinct measurements. The provided data is furthermore publicly available on the workshop’s data repository together with a plotting tool for visualization.

Published
2022
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13. Limits on dark matter effective field theory parameters with CRESST-II

Author

G. Angloher, P. Bauer, A. Bento, E. Bertoldo, C. Bucci, L. Canonica, A. D’Addabbo, X. Defay, S. Di Lorenzo, A. Erb, F. v. Feilitzsch, N. Ferreiro Iachellini, P. Gorla, D. Hauff, J. Jochum, M. Kiefer, H. Kluck, H. Kraus, A. Langenkämper, M. Mancuso, V. Mokina, E. Mondragon, V. Morgalyuk, A. Münster, M. Olmi, C. Pagliarone, F. Petricca, W. Potzel, F. Pröbst, F. Reindl, J. Rothe, K. Schäffner, J. Schieck, V. Schipperges, S. Schönert, M. Stahlberg, L. Stodolsky, C. Strandhagen, R. Strauss, C. Türkoglu, I. Usherov, M. Willers, M. Wüstrich, V. Zema, The CRESST Collaboration, and R. Catena

Subjects
Astrophysics, QB460-466, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract

Abstract CRESST is a direct dark matter search experiment, aiming for an observation of nuclear recoils induced by the interaction of dark matter particles with cryogenic scintillating calcium tungstate crystals. Instead of confining ourselves to standard spin-independent and spin-dependent searches, we re-analyze data from CRESST-II using a more general effective field theory (EFT) framework. On many of the EFT coupling constants, improved exclusion limits in the low-mass region (< 3–4 GeV/$$c^2$$ c2 ) are presented.

Published
2019
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14. Results on MeV-scale dark matter from a gram-scale cryogenic calorimeter operated above ground

Author

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

Subjects
Astrophysics, QB460-466, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract

Abstract Models for light dark matter particles with masses below 1 GeV/c $$^2$$ 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 $$\nu $$ ν -cleus experiment has achieved an energy threshold of $$E_{th}=(19.7\pm 0.9)$$ E t h = ( 19.7 ± 0.9 ) eV. This is one order of magnitude lower than for previous devices 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 and 500 MeV/c $$^2$$ 2 .

Published
2017
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15. Dark-photon search using data from CRESST-II Phase 2

Author

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

Subjects
Dark Matter, Probability Density Function, Phonon Energy, Gaussian Probability Density Function, Dark Photon, Astrophysics, QB460-466, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract

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 $$^2$$ 2 .

Published
2017
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16. Erratum to: Geant4-based electromagnetic background model for the CRESST dark matter experiment

Author

A. H. Abdelhameed, G. Angloher, P. Bauer, A. Bento, E. Bertoldo, R. Breier, C. Bucci, L. Canonica, A. D’Addabbo, S. Di Lorenzo, A. Erb, F. v. Feilitzsch, N. Ferreiro Iachellini, S. Fichtinger, A. Fuss, P. Gorla, D. Hauff, M. Jes̆kovský, J. Jochum, J. Kaizer, A. Kinast, H. Kluck, H. Kraus, A. Langenkämper, M. Mancuso, V. Mokina, E. Mondragón, M. Olmi, T. Ortmann, C. Pagliarone, V. Palus̆ová, L. Pattavina, F. Petricca, W. Potzel, P. Povinec, F. Pröbst, F. Reindl, J. Rothe, K. Schäffner, J. Schieck, V. Schipperges, D. Schmiedmayer, S. Schönert, C. Schwertner, M. Stahlberg, L. Stodolsky, C. Strandhagen, R. Strauss, C. Türkoğlu, I. Usherov, M. Willers, V. Zema, and J. Zeman

Subjects
Astrophysics, QB460-466, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract

The original version of this article unfortunately contains mistakes.

Published
2019
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18. First results on low-mass dark matter from the CRESST-III experiment

Author

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

Subjects
Paper, History, Computer Science Applications, Education, ddc
Abstract

The CRESST experiment (Cryogenic Rare Even Search with Superconducting Thermometers), 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 CaWO4 crystals, which are operated as cryogenic calorimeters at millikelvin temperatures. Each interaction in the CaWO4 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.

Published
2019

19. First results on sub-GeV spin-dependent dark matter interactions with$^{7}$Li

Author

C. Schwertner, L. Pattavina, A. Fuss, J. Rothe, Josef Jochum, L. Canonica, A. Giuliani, M. Olmi, D. Schmiedmayer, M. Chapellier, H. Kluck, X. Defay, V. Zema, Andreas Erb, Peter Bauer, K. Schäffner, E. Mondragon, V.N. Shlegel, R. D. Strauss, S. Di Lorenzo, W. Potzel, T. Ortmann, A. Münster, A. H. Abdelhameed, F. Pröbst, A. Langenkämper, F. Petricca, S. Fichtinger, F. Reindl, Jochen Schieck, I. Usherov, P. Gorla, N. Ferreiro Iachellini, C. Pagliarone, M. Mancuso, C. Türkoğlu, A. S. Zolotarova, V. Schipperges, C. Nones, G. Angloher, D. Hauff, C. Bucci, Leo Stodolsky, V.M. Mokina, F. v. Feilitzsch, A.C.S.S.M. Bento, E. Bertoldo, Matias Velázquez, A. Kinast, A. D'Addabbo, Stefan Schönert, D.V. Poda, M. Stahlberg, C. Strandhagen, M. Willers, H. Kraus, Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Science et Ingénierie des Matériaux et Procédés (SIMaP ), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), CRESST, Science et Ingénierie des Matériaux et Procédés (SIMaP), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP)-Institut National Polytechnique de Grenoble (INPG)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA), Université Joseph Fourier - Grenoble 1 (UJF)-Centre National de la Recherche Scientifique (CNRS)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut de Chimie du CNRS (INC)-Institut National Polytechnique de Grenoble (INPG), and Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut National Polytechnique de Grenoble (INPG)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Nuclear reaction, Physics - Instrumentation and Detectors, dark matter: interaction, Physics and Astronomy (miscellaneous), Dark matter, Mathematics::Analysis of PDEs, FOS: Physical sciences, Elementary particle, spin: dependence, 7. Clean energy, 01 natural sciences, Particle identification, Particle detector, Nuclear physics, 0103 physical sciences, Neutron, p: mass, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], 010306 general physics, Nuclear Experiment, Instrumentation and Methods for Astrophysics (astro-ph.IM), Engineering (miscellaneous), Spin-½, Physics, S030DP5, 010308 nuclear & particles physics, background, target: crystal, S030DP1, Instrumentation and Detectors (physics.ins-det), S030DN5, Orientation (vector space), n: mass, cryogenics, lithium, High Energy Physics::Experiment, Astrophysics - Instrumentation and Methods for Astrophysics
Abstract

In this work, we want to highlight the potential of lithium as a target for spin-dependent dark matter search in cryogenic experiments, with a special focus on the low-mass region of the parameter space. We operated a prototype detector module based on a $$\hbox {Li}_2\hbox {MoO}_4$$ target crystal in an above-ground laboratory. Despite the high background environment, the detector sets a competitive limit on spin-dependent interactions of dark matter particles with protons and neutrons for masses between $$0.8~\hbox {GeV/c}^2$$ and $$1.5~\hbox {GeV/c}^2$$ .

Published
2019
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20. Dark-photon search using data from CRESST-II Phase 2

Author

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

Subjects
Particle physics, Photon, Physics - Instrumentation and Detectors, Physics and Astronomy (miscellaneous), Dark matter, Phase (waves), FOS: Physical sciences, lcsh:Astrophysics, Electron, Astrophysics::Cosmology and Extragalactic Astrophysics, Dark Matter Probability Density Function Phonon Energy Gaussian Probability Density Function Dark Photon, Kinetic energy, 01 natural sciences, Phonon Energy, Dark photon, High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), Gaussian Probability Density Function, 0103 physical sciences, lcsh:QB460-466, Dark Matter, lcsh:Nuclear and particle physics. Atomic energy. Radioactivity, 010306 general physics, Engineering (miscellaneous), Mixing (physics), Physics, 010308 nuclear & particles physics, Dark Photon, Instrumentation and Detectors (physics.ins-det), Weakly interacting massive particles, Probability Density Function, lcsh:QC770-798
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$^2$., submitted EPJ C

Published
2017

21. Search for dark photons using data from CRESST-II Phase 2

Author

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

Subjects
Physics, History, Particle physics, Photon, Dark matter, Phase (waves), Scalar field dark matter, Elementary particle, Computer Science Applications, Education, WIMP, Weakly interacting massive particles, Mixing: kinetic | particle: interaction | dark matter | photon | sensitivity | WIMP | vector boson | long-lived | nucleus | CRESST | standard model, Light dark matter
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

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

Author

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

Subjects
Physics, Physics - Instrumentation and Detectors, Physics::Instrumentation and Detectors, Dark matter, FOS: Physical sciences, Astronomy and Astrophysics, Instrumentation and Detectors (physics.ins-det), Particle detector, Particle identification, Nuclear physics, WIMP, Scintillation counter, Decay chain, Alpha decay, Radioactive decay
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
2015

23. Status Update on the CRESST Dark Matter Search

Author

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

Subjects
Physics, Dark matter, Astronomy
Published
2014
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24. Ultra-sensitive determination of K, Th, U and other trace impurities in liquid organic scintillators by NAA

Author

F. v. Feilitzsch, T. Goldbrunner, G. Angloher, and R. v. Hentig

Subjects
Chemistry, Health, Toxicology and Mutagenesis, Extraction (chemistry), Radiochemistry, Public Health, Environmental and Occupational Health, Analytical chemistry, Thorium, chemistry.chemical_element, Actinide, Scintillator, Alkali metal, Pollution, Analytical Chemistry, Nuclear Energy and Engineering, Impurity, Scintillation counter, Radiology, Nuclear Medicine and imaging, Neutron activation analysis, Spectroscopy
Abstract

We present a NAA method to determine ultratraces of K, Th, U and other trace impurities in liquid organic scintillators, which are known as ultrapure detector materials for neutrino or dark matter experiments. A combined optimization of relevant factors for sensitive NAA has been realized, leading to a sensitivity for U down to 10−16g/g. Samples of 250 ml have been irradiated up to 120 h at a thermal neutron flux of 5–8·1012·n·cm−2·s−1. Acidic extraction, wet ashing and TBP-extraction are used for radiochemical separations. Finally, coincidence techniques are applied for increased sensitivity.

Published
1998
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25. Neutron activation analysis of ultrapure water in a 500 ml silicon single crystal irradiation flask

Author

T. Goldbrunner, G. Angloher, F. v. Feilitzsch, and R. v. Hentig

Subjects
Silicon, Chemistry, Health, Toxicology and Mutagenesis, Radiochemistry, Public Health, Environmental and Occupational Health, chemistry.chemical_element, Pollution, Analytical Chemistry, Laboratory flask, Nuclear Energy and Engineering, Distilled water, Ultrapure water, Radiology, Nuclear Medicine and imaging, Sample preparation, Irradiation, Neutron activation analysis, Single crystal, Spectroscopy
Abstract

Trace element analysis of ultrapure liquids requires the avoidance of contamination not only during preparation but also during irradiation of the sample. Double subboiling distilled water activated within flasks made out of synthetic quartz shows a significant correlation between irradiation time, quality of the flasks and the determined trace element concentration. The resulting falsification of the analysis and limitation of sensitivity seems to be caused by diffusion-like processes during irradiation. Even though single crystal FZ-silicon is rather brittle, it has been possible to fabricate a 500 ml irradiation flask out of this extremely pure material. The flask as well as its application in the analysis of double subboiling distilled water are discussed in the article.

Published
1998
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26. Munich dark matter search

Author

F. Pröbst, Matthias Frank, E. Kellner, G. Forster, J. Igalson, H. J. Gebauer, D. Dummer, P. Ferger, A. Rulofs, F. v. Feilitzsch, A. Nucciotti, S. Cooper, P. Colling, Urmas Nagel, W. Seidel, and Leo Stodolsky

Subjects
Physics, Phase transition, Particle physics, Physics::Instrumentation and Detectors, Axion Dark Matter Experiment, Dark matter, General Materials Science, Astrophysics::Cosmology and Extragalactic Astrophysics, Cryogenic Dark Matter Search, Condensed Matter Physics, Atomic and Molecular Physics, and Optics
Abstract

We plan a dark matter search using cryogenic calorimetric detectors with superconducting phase transition thermometers. We discuss such an experiment, compare its estimated sensitivity range with other dark matter searches, and discuss its planned realization.

Published
1993
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27. Physics and performance of calorimetric particle detectors with dielectric absorbers and superconducting phase transition thermometers

Author

H. J. Gebauer, E. Kellner, P. Colling, A. Nucciotti, Leo Stodolsky, D. Dummer, G. Forster, Matthias Frank, J. Igalson, F. Pröbst, P. Ferger, F. v. Feilitzsch, W. Seidel, Urmas Nagel, S. Cooper, and A. Rulofs

Subjects
Superconductivity, Physics, Phase transition, Physics::Instrumentation and Detectors, business.industry, Dielectric, Atmospheric temperature range, Condensed Matter Physics, Atomic and Molecular Physics, and Optics, Calorimeter, Crystal, Optics, Thermometer, Sapphire, General Materials Science, Atomic physics, business
Abstract

We present results obtained with detectors consisting of dielectric absorber crystals and superconducting phase transition thermometers made of Ir/Au bilayers. With a 31 g sapphire crystal and an Ir/Au thermometer operated at 45 mK we have obtained an energy resolution of 220 eV (FWHM) for collimated 5.9 ke V X-rays. To explain the measured pulse shapes we have developed a model which includes the effect of non-thermal phonons. Results obtained previously with a 18 g Si absorber and an Ir/Au thermometer with broad transition allowed checking this model over a wide temperature range. A heater experiment performed with this calorimeter provides further support of our model.

Published
1993
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28. Development of cryogenic detectors for GNO

Author

F. v. Feilitzsch, W. Potzel, A. Rüdig, J. Jochum, H. R. T. Wulandari, T. Lachenmaier, J.-C. Lanfranchi, Th. Jagemann, M. Stark, and J. Schnagl

Subjects
Physics, Nuclear physics, Cosmic neutrino background, Particle physics, Neutrino detector, Physics::Instrumentation and Detectors, Solar neutrino, Measurements of neutrino speed, High Energy Physics::Experiment, Neutrino, Solar neutrino problem, Particle detector, Semiconductor detector
Abstract

The neutrino capture reaction 71Ga(νe,e−)71Ge and the reverse EC-decay is used by GNO to monitor the flux of solar neutrinos in a routinely operating neutrino observatory. Low temperature detectors (LTDs) offer a better performance concerning efficiency, energy resolution and threshold than the proportional counters that are used now. We report on measurements with a detector setup with absorption in 4 π and counting efficiency near 100%. Activated germanium has been integrated succesfully in the LTD setup by thermal decomposition of GeH4.

Published
2002
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29. Linearity investigations and pulse shape analysis of high resolution STJ X-ray detectors

Author

T. Lachenmaier, M. E. Huber, F. v. Feilitzsch, J. Jochum, J. Schnagl, G. Angloher, A. Rüdig, J.-C. Lanfranchi, M. Stark, Th. Jagemann, H. R. T. Wulandari, and W. Potzel

Subjects
Physics, business.industry, Detector, X-ray detector, Linearity, Condensed Matter::Mesoscopic Systems and Quantum Hall Effect, Pulse shaping, Particle detector, Tunnel effect, Optics, Condensed Matter::Superconductivity, Superconducting tunnel junction, Absorption (electromagnetic radiation), business
Abstract

A slight deviation from linearity has been detected for single aluminum superconducting tunnel junction (Al-STJ) detectors in the energy range between E=1.74 keV and E=6.49 keV. The nonlinearity can be explained by the escape of recombination phonons into the substrate. Varying the size of the junction shows that the recombination of the quasiparticles takes place after their diffusive propagation across the junction. Pulse shape analysis allows to identify background events that are caused by photo-and Auger-electron propagation. For a detector system based on a Al-STJ with a Pb absorber pulse shape analysis allows to separate events related to absorption in the STJ and in the absorber.

Published
2002
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30. Cryogenic detector systems for materials analysis

Author

J. Jochum, F. v. Feilitzsch, Theo Hertrich, R. v. Hentig, C. Hollerith, B. Simmnacher, J. Höhne, U. Hess, K. Phelan, D. Wernicke, J. Nicolosi, R. Weiland, M. Bühler, D. Redfern, and M. E. Huber

Subjects
Superconductivity, Physics, Field electron emission, Spectrometer, Scanning electron microscope, Astrophysics::High Energy Astrophysical Phenomena, Detector, Resolution (electron density), Analytical chemistry, Water cooling, Engineering physics, Coolant
Abstract

The need to analyze small amounts of materials on surfaces e.g. in semiconductor industry drives the development of high resolution X-ray spectrometers based on superconducting detector technology. Since low excitation energies needed for high spatial resolution in Field Emission Scanning Electron Microscopes (FESEM) yield only X-ray lines in the lower part of the X-ray spectrum (

Published
2002
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31. Scintillation light and phonon measurement based on Ir/Au-thermometers

Author

J. Schnagl, Th. Jagemann, F. v. Feilitzsch, H. R. T. Wulandari, M. Stark, M. E. Huber, W. Potzel, J.-C. Lanfranchi, A. Rüdig, J. Jochum, T. Lachenmaier, and T. Frank

Subjects
Physics, Scintillation, Physics::Instrumentation and Detectors, Phonon, business.industry, Transition temperature, Detector, Electromagnetic radiation, Particle detector, Crystal, Optics, Condensed Matter::Superconductivity, Thermometer, business
Abstract

With the simultaneous measurement of the temperature signal of a CaWO4 absorber crystal and the scintillation light, it is possible to reject the gamma and electron background in the search for dark matter particles. We report on an alternative new light detector design for the CRESST experiment. For the light detector we use iridium/gold phase transition thermometers with a special circular structure and an Al phonon collector on a silicon substrate. With this detector an energy threshold of 22.3 eV on a 5 σ level was achieved. The light detector was tested in coincidence with a phonon measurement of a 300 g CaWO4 crystal. The phonons from the CaWO4 crystal were measured with an Ir/Au thermometer with a transition temperature of 32 mK.

Published
2002
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32. Energy resolution ΔE=12 eV at 5.9 keV for lead absorber coupled to a single Al-STJ via phonons

Author

A. Rüdig, J. Jochum, F. v. Feilitzsch, M. E. Huber, G. Angloher, and R. Mößbauer

Subjects
Superconductivity, Materials science, business.industry, Phonon, Resolution (electron density), chemistry.chemical_element, Full width at half maximum, chemistry, Aluminium, Superconducting tunnel junction, Optoelectronics, Thin film, business, Layer (electronics)
Abstract

An energy resolution of ΔE=12 eV (FWHM) has been measured for the 55Mn Kα1-line (E=5.9 keV) using a superconducting lead absorber (90×90×1.3 μm3) read out by a single aluminum superconducting tunnel junction (100×100 μm2). The total electronic noise contribution was measured as ΔEelec=4 eV (FWHM). The superconducting tunnel junction is located on a Si3N4-membrane of thickness 0.3 μm, the lead absorber is separated from the superconducting tunnel junction’s top layer by a thin layer of natural aluminum oxide.

Published
2002
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33. The CRESST Dark Matter Search

Author

W. Seidel, M. Bruckmayer, C. Bucci, S. Cooper, C. Cozzini, P. Di Stefano, F. v. Feilitzsch, T. Frank, D. Hauff, T. Jagemann, J. Jochum, R. Keeling, H. Kraus, J. Marchese, F. Pröbst, Y. Ramachers, I. Sergeyev, M. Stark, and L. Stodolsky

Published
2001
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34. The CRESST Dark Matter Search

Author

J. Jochum, M. Bravin, M. Bruckmayer, C. Bucci, S. Cooper, C. Cozzini, P. DiStefano, F. V. Feilitzsch, T. Frank, T. Jagemann, R. Keeling, H. Kraus, J. Lush, J. Marchese, O. Meier, P. Meunier, U. Nagel, D. Pergolesi, F. Pröbst, Y. Ramachers, J. Schnagl, W. Seidel, I. Sergeyev, M. Stark, L. Stodolsky, S. Uchaikin, and H. Wulandari

Published
2001
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35. Cryogenic Microcalorimeters for High Resolution Energy Dispersive X-Ray Spectrometry

Author

S. Pfnür, T. Nüßle, T. Frank, S. Wänninger, G. Angloher, M. Altmann, Theo Hertrich, P. Hettl, F. v. Feilitzsch, J. Jochum, J. Schnagl, Jens Höhne, and M. Bühler

Subjects
Materials science, Physics::Instrumentation and Detectors, Energy Dispersive X-Ray Spectrometry, Analytical chemistry, High resolution, Instrumentation
Abstract

Cryogenic detectors with excellent energy resolution and low energy threshold far beyond the level of semiconducting detectors open a variety of new. applications in physics including search for Dark Matter in the universe [2], neutrino physics [3], and IR-, UV- and X-ray astrophysics [4, 9]. Interdisciplinary fields where cryogenic detectors have already shown promising results are the detection of biomolecules [5] and X-ray spectroscopy at synchrotron beam lines [6] and in scanning electron microscopes (SEMs) [7]. For both, astrophysical and analytical use, the development of high resolution microcalorimeters based on iridium/gold phase transition thermometers and aluminum tunnel junctions for use in a compact and universal detector system was initiated.Our cryogenic microcalorimeters consist of an absorber, a temperature sensor and a weak coupling to a heat sink. An X-ray photon interacts with the absorber and raises its temperature. The sensor measures the temperature increase and the system then, mediated by the coupling, relaxes back to its operating temperature.

Published
1999
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36. Energy calibration of superconducting transition edge sensors for x-ray detection using pulse analysis

Author

C. Hollerith, D. Wernicke, B. Simmnacher, F. v. Feilitzsch, C. Isaila, T. May, R. Weiland, W. Potzel, J. Jochum, K. Phelan, and J. Höhne

Subjects
Physics, Phase transition, Spectrometer, Physics::Instrumentation and Detectors, business.industry, Detector, Particle detector, Optics, Calibration, Measuring instrument, business, Absorption (electromagnetic radiation), Instrumentation, Energy (signal processing)
Abstract

Transition edge sensors (TESs) have been developed to be used as high-resolution x-ray detectors. They show excellent energy resolution and can be used in many applications. TESs are a special kind of calorimeters that can determine small temperature changes after x-ray absorption. Such a temperature change causes a strong resistance change (superconducting to normal-conducting phase transition) that can be measured. The energy calibration of a TES based spectrometer is problematic due to the nonlinear behavior of the detector response. In this article, a method is introduced to calibrate the energy scale of TES spectra. This is accomplished by calculating the energy dependence of the response of the detector operated in electrothermal feedback mode. Using this method a calibration accuracy of a few eV for an x-ray energy of 6keV can be achieved. Examples of energy dispersive x-ray spectroscopy (EDS) measurements demonstrate the high quality of this method for everyday use of TES EDS detectors in material...

Published
2006
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38. Feasibility of a detector for nuclear radiation based on superconducting grains

Author

Lothar Oberauer, W. Seidel, and F. v. Feilitzsch

Subjects
Superconductivity, Physics, Phase transition, Phase boundary, chemistry, Condensed matter physics, Metastability, chemistry.chemical_element, Radiation, Tin, Instrumentation, Particle detector, Phase diagram
Abstract

We studied the sensitivity of a radiation detector based on metastable superconducting grains. Radiation is detected by the phase transition from the superconducting to the normal‐conducting state of a grain induced by energy absorption. Metastable states of tin and cadmium grains were tested. The phase boundary of a large sample of grains was found to be broadened due to variations of the phase diagrams of single grains. Therefore, the use of superconductors with a low critical temperature Tc and an operation temperature close to Tc seems advisable to increase the sensitivity of the detector. For Cd grains a sensitivity normalized to the grain volume of 12 eV/μm3 was achieved for the detection of γ rays. These grains showed an instability in the superconducting to normal‐conducting phase transition for temperatures below 350 mK.

Published
1987
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40. The CRESST dark matter search - Status and Perspectives

Author

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

Subjects
Physics, Particle physics, Surface alpha, Detector: performance | dark matter | sensitivity | Gran Sasso | cluster | CRESST, Dark matter, Detector, Phase (waves), Overall performance, Low Mass, Light dark matter, Background level
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 (

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

Author

G Angloher, M Bauer, P Bauer, I Bavykina, A Bento, C Bucci, L Canonica, C Ciemniak, X Defay, G Deuter, A Erb, F v Feilitzsch, N Ferreiro Iachellini, P Gorla, A Gütlein, D Hauff, P Huff, C Isaila, J Jochum, and M Kiefer

Subjects
ELECTRON capture, ELECTRONS, NUCLEAR physics, NUCLEAR science, ATOMS
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 y and y and for 180W with y and y at 90% CL. Depending on the process, these values improve the currently best limits by a factor of . [ABSTRACT FROM AUTHOR]

Published
2016
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