Publications


First results on sub-GeV spin-dependent dark matter interactions with Li-7

EUROPEAN PHYSICAL JOURNAL C 79 (2019) ARTN 630

AH Abdelhameed, G Angloher, P Bauer, A Bento, E Bertoldo, C Bucci, L Canonica, A D'Addabbo, X Defay, S Di Lorenzo, A Erb, F von Feilitzsch, NF Iachellini, S Fichtinger, A Fuss, P Gorla, D Hauff, J Jochum, A Kinast, H Kluck, H Kraus, A Langenkaemper, M Mancuso, V Mokina, E Mondragon, A Muenster, M Olmi, T Ortmann, C Pagliarone, L Pattavina, F Petricca, W Potzel, F Proebst, F Reindl, J Rothe, K Schaeffner, J Schieck, V Schipperges, D Schmiedmayer, S Schoenert, C Schwertner, M Stahlberg, L Stodolsky, C Strandhagen, R Strauss, C Tuerkoglu, I Usherov, M Willers, V Zema, M Chapellier, A Giuliani, C Nones, DV Poda, VN Shlegel, M Velazquez, AS Zolotarova, CRESST Collaboration


Geant4-based electromagnetic background model for the CRESST dark matter experiment

European Physical Journal C 79 (2019)

AH Abdelhameed, G Angloher, P Bauer, A Bento, E Bertoldo, R Breier, C Bucci, L Canonica, A D’Addabbo, SD Lorenzo, A Erb, FV Feilitzsch, NF 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, J Zeman

© 2019, The Author(s). 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 CaWO 4 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±16)% of the electromagnetic background in the energy range between 1 and 40keV.


Megahertz non-contact luminescence decay time cryothermometry by means of ultrafast PbI2 scintillator.

Scientific reports 9 (2019) 5274-

VB Mykhaylyk, H Kraus, L Bobb, R Gamernyk, K Koronski

Realtime in situ temperature monitoring in difficult experimental conditions or inaccessible environments is critical for many applications. Non-contact luminescence decay time thermometry is often the method of choice for such applications due to a favorable combination of sensitivity, accuracy and robustness. In this work, we demonstrate the feasibility of an ultrafast PbI2 scintillator for temperature determination, using the time structure of X-ray radiation, produced by a synchrotron. The decay kinetics of the scintillations was measured over the 8-107 K temperature range using monochromatic pulsed X-ray excitation. It is found that lead iodide exhibits a very fast and intense scintillation response due to excitons and donor-acceptor pairs, with the fast decay component varying between 0.08 and 0.5 ns - a feature that can be readily exploited for temperature monitoring. The observed temperature dependence of the decay time is discussed in terms of two possible mechanisms of thermal quenching - transition over activation barrier and phonon-assisted escape. It is concluded that the latter provides a better fit to the experimental results and is consistent with the model of luminescence processes in PbI2. We evaluated the sensitivity and estimated the accuracy of the temperature determination as ca. ±6 K at 107 K, improving to ±1.4 K at 8 K. The results of this study prove the feasibility of temperature monitoring, using ultrafast scintillation of PbI2 excited by X-ray pulses from a synchrotron, thus enabling non-contact in-situ cryothermometry with megahertz sampling rate.


Low temperature scintillation properties of Ga2O3

APPLIED PHYSICS LETTERS 115 (2019) ARTN 081103

VB Mykhaylyk, H Kraus, V Kapustianyk, M Rudko


Bright and fast scintillation of organolead perovskite MAPbBr(3) at low temperatures

MATERIALS HORIZONS 6 (2019) 1740-1747

VB Mykhaylyk, H Kraus, M Saliba


Limits on dark matter effective field theory parameters with CRESST-II

EUROPEAN PHYSICAL JOURNAL C 79 (2019) ARTN 43

G Angloher, P Bauer, A Bento, E Bertoldo, C Bucci, L Canonica, A D'Addabbo, X Defay, S Di Lorenzo, A Erb, FV Feilitzsch, NF Iachellini, P Gorla, D Hauff, J Jochum, M Kiefer, H Kluck, H Kraus, A Langenkaemper, M Mancuso, V Mokina, E Mondragon, V Morgalyuk, A Muenster, M Olmi, C Pagliarone, F Petricca, W Potzel, F Proebst, F Reindl, J Rothe, K Schaffner, J Schieck, V Schipperges, S Schoenert, M Stahlberg, L Stodolsky, C Strandhagen, R Strauss, C Tuerkoglu, I Usherov, M Willers, M Wuestrich, V Zema, R Catena, CRESSTCollaboration


Searches for electron interactions induced by new physics in the EDELWEISS-III germanium bolometers

PHYSICAL REVIEW D 98 (2018) ARTN 082004

E Armengaud, C Augier, A Benoit, L Berge, J Billard, A Broniatowski, P Camus, A Cazes, M Chapellier, F Charlieux, M De Jesus, L Dumoulin, K Eitel, J Gascon, A Giuliani, M Gros, Y Jin, A Juillard, M Kleifges, V Kozlov, H Kraus, VA Kudryavtsev, H Le-Sueur, R Maisonobe, S Marnieros, D Misiak, X-F Navick, C Nones, E Olivieri, P Pari, B Paul, D Poda, E Queguiner, S Rozov, V Sanglard, S Scorza, B Siebenborn, D Tcherniakhovski, L Vagneron, M Weber, E Yakushev, A Zolotarova, EDELWEISS Collaboration


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

Journal of Low Temperature Physics (2018) 1-8

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

© 2018 The Author(s) 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 CaWO(Formula presented.) 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/c(Formula presented.), 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.


Complete event-by-event alpha/gamma (beta) separation in a full-size TeO2 CUORE bolometer by Neganov-Luke-magnified light detection

PHYSICAL REVIEW C 97 (2018) ARTN 032501

L Berge, M Chapellier, M de Combarieu, L Dumoulin, A Giuliani, M Gros, P de Marcillac, S Marnieros, C Nones, V Novati, E Olivieri, B Paul, DV Poda, T Redon, B Siebenborn, AS Zolotarova, E Armengaud, C Augier, A Benoit, J Billard, A Broniatowski, P Camus, A Cazes, F Charlieux, M De Jesus, K Eitel, N Foerster, J Gascon, Y Jin, A Juillard, M Kleifges, V Kozlov, H Kraus, VA Kudryavtsev, H Le Sueur, R Maisonobe, X-F Navick, P Pari, E Queguiner, S Rozov, V Sanglard, L Vagneron, M Weber, E Yakushev


Impact of the Organic Cation on the Optoelectronic Properties of Formamidinium Lead Triiodide.

The journal of physical chemistry letters 9 (2018) 4502-4511

CL Davies, J Borchert, CQ Xia, RL Milot, H Kraus, MB Johnston, LM Herz

Metal halide perovskites have proven to be excellent light-harvesting materials in photovoltaic devices whose efficiencies are rapidly improving. Here, we examine the temperature-dependent photon absorption, exciton binding energy, and band gap of FAPbI3 (thin film) and find remarkably different behavior across the β-γ phase transition compared with MAPbI3. While MAPbI3 has shown abrupt changes in the band gap and exciton binding energy, values for FAPbI3 vary smoothly over a range of 100-160 K in accordance with a more gradual transition. In addition, we find that the charge-carrier mobility in FAPbI3 exhibits a clear T-0.5 trend with temperature, in excellent agreement with theoretical predictions that assume electron-phonon interactions to be governed by the Fröhlich mechanism but in contrast to the T-1.5 dependence previously observed for MAPbI3. Finally, we directly observe intraexcitonic transitions in FAPbI3 at low temperature, from which we determine a low exciton binding energy of only 5.3 meV at 10 K.


Non-Contact Luminescence Lifetime Microthermometry using Scintillation Sensors

ACTA PHYSICA POLONICA A 133 (2018) 1108-1111

VB Mykhaylyk, H Kraus, A Wagner


Low-background gamma spectroscopy at the Boulby Underground Laboratory

ASTROPARTICLE PHYSICS 97 (2018) 160-173

PR Scovell, E Meehan, HM Araujo, J Dobson, C Ghag, H Kraus, VA Kudryavtsev, X-R Liu, P Majewski, SM Paling, RM Preece, R Saakyan, A Tomas, C Toth, LM Yeoman


The Effects of Doping Density and Temperature on the Optoelectronic Properties of Formamidinium Tin Triiodide Thin Films.

Advanced materials (Deerfield Beach, Fla.) 30 (2018) e1804506-

RL Milot, MT Klug, CL Davies, Z Wang, H Kraus, HJ Snaith, MB Johnston, LM Herz

Optoelectronic properties are unraveled for formamidinium tin triiodide (FASnI3 ) thin films, whose background hole doping density is varied through SnF2 addition during film fabrication. Monomolecular charge-carrier recombination exhibits both a dopant-mediated part that grows linearly with hole doping density and remnant contributions that remain under tin-enriched processing conditions. At hole densities near 1020 cm-3 , a strong Burstein-Moss effect increases absorption onset energies by ≈300 meV beyond the bandgap energy of undoped FASnI3 (shown to be 1.2 eV at 5 K and 1.35 eV at room temperature). At very high doping densities (1020 cm-3 ), temperature-dependent measurements indicate that the effective charge-carrier mobility is suppressed through scattering with ionized dopants. Once the background hole concentration is nearer 1019 cm-3 and below, the charge-carrier mobility increases with decreasing temperature according to ≈T-1.2 , suggesting that it is limited mostly by intrinsic interactions with lattice vibrations. For the lowest doping concentration of 7.2 × 1018 cm-3 , charge-carrier mobilities reach a value of 67 cm2 V-1 s-1 at room temperature and 470 cm2 V-1 s-1 at 50 K. Intraexcitonic transitions observed in the THz-frequency photoconductivity spectra at 5 K reveal an exciton binding energy of only 3.1 meV for FASnI3 , in agreement with the low bandgap energy exhibited by this perovskite.


Optimizing EDELWEISS detectors for low-mass WIMP searches

PHYSICAL REVIEW D 97 (2018) ARTN 022003

Q Arnaud, E Armengaud, C Augier, A Benoit, L Berge, J Billard, A Broniatowski, P Camus, A Cazes, M Chapellier, F Charlieux, M De Jesus, L Dumoulin, K Eitel, N Foerster, J Gascon, A Giuliani, M Gros, L Hehn, Y Jin, A Juillard, M Kleifges, V Kozlov, H Kraus, VA Kudryavtsev, H Le-Sueur, R Maisonobe, S Marnieros, X-F Navick, C Nones, E Olivieri, P Pari, B Paul, D Poda, E Queguiner, S Rozov, V Sanglard, S Scorza, B Siebenborn, L Vagneron, M Weber, E Yakushev, EDELWEISS Collaboration


TES-Based Light Detectors for the CRESST Direct Dark Matter Search

Journal of Low Temperature Physics (2018) 1-7

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

© 2018 The Author(s) The CRESST experiment uses cryogenic detectors based on transition-edge sensors to search for dark matter interactions. Each detector module consists of a scintillating CaWO(Formula presented.) crystal and a silicon-on-sapphire (SOS) light detector which operate in coincidence (phonon-light technique). The 40-mm-diameter SOS disks (2 g mass) used in the data taking campaign of CRESST-II Phase 2 (2014–2016) reached absolute baseline resolutions of (Formula presented.) 4–7 eV. This is the best performance reported for cryogenic light detectors of this size. Newly developed silicon beaker light detectors (4 cm height, 4 cm diameter, 6 g mass), which cover a large fraction of the target crystal surface, have achieved a baseline resolution of (Formula presented.)eV. First results of further improved light detectors developed for the ongoing low-threshold CRESST-III experiment are presented.


Characterisation of tungstate and molybdate crystals ABO<inf>4</inf> (A = Ca, Sr, Zn, Cd; B = W, Mo) for luminescence lifetime cryothermometry

Materialia 4 (2018) 287-296

N Ahmed, H Kraus, HJ Kim, V Mokina, V Tsiumra, A Wagner, Y Zhydachevskyy, VB Mykhaylyk

© 2018 Acta Materialia Inc. Luminescence lifetime thermometry for remote temperature monitoring of cryogenic objects requires materials that exhibit a suitably large change of the luminescence kinetics at low temperatures. Results of systematic studies of the temperature-induced changes in the luminescence of tungstates and molybdates with the general formula ABO4 (A = Ca, Sr, Zn, Cd; B = W, Mo) over the 4.5–300 K temperature range are summarized. It is shown through analysing changes of the emission and excitation spectra, as well as the decay kinetics, that in these materials the luminescence is due to the emission of self-trapped excitons, a process that exhibits strong temperature dependence. The main emphasis of the study is on establishing the factors that determine the character of the temperature dependence of the luminescence decay time constant. We discuss our findings in terms of a model that analyses the dynamics of radiative and non-radiative transitions between the excited and ground states of the emission center. Two thermally activated processes drive the observed changes. The first is the non-radiative decay of excited states, resulting in a decrease of the luminescence decay time constant at high temperatures. Additionally it is demonstrated that in molybdates and tungstates the fine splitting of the excited state facilitates a second mechanism for thermally activated exchange of charged carriers between the two split levels. This has a noticeable effect on the dynamics of the radiative decay at low temperatures. We established that the sensitivity of the luminescence lifetime to temperature changes can be estimated by using information on the energy structure of materials. It is concluded that within tungstates and molybdates under study SrWO4 is the most promising material for application in luminescence lifetime cryothermometry.


Search for low mass dark matter particles with the cresst experiment

Proceedings of Science (2017)

C Türkoglu, G Angloher, P Bauer, A Bento, C Bucci, L Canonica, X Defay, A Erb, F Feilitzsch, NF Iachellini, P Gorla, A Gütlein, D Hauff, J Jochum, M Kiefer, H Kluck, H Kraus, JC Lanfranchi, A Langenkämper, J Loebell, M Mancuso, E Mondragon, A Münster, 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, HHT Thi, M Uffinger, A Ulrich, I Usherov, S Wawoczny, M Willers, M Wüstrich

© Copyright owned by the author(s). It has been proven by several astronomical observations that dark matter exists, but no particle candidates have been observed yet. The CRESST experiment aims to directly detect dark matter particles elastically scattering off nuclei in CaWO4 crystals which are operated at mK temperatures. With nuclear recoil energy thresholds as low as 0.3 keV [2] and 0.6 keV [3], for the detector modules LISE and TUM40, respectively, CRESST is ideally suited for the detection of low-mass dark matter particles [5]. Additionally, the radiopurity of the crystals is another important factor for the detector performance. For a detailed understanding of the detector backgrounds, we simulate the radioactive contaminations of the TUM40 detector module with Geant4. The outcome of this simulation will be vital for the CRESST-III experiment. In this contribution, we discuss our results of the search for dark matter and dark photons achieved with the detector module Lise of CRESST-II. We will discuss the status of CRESST-III Phase 1 which started taking data in 2016.


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

EUROPEAN PHYSICAL JOURNAL C 77 (2017) ARTN 637

G Angloher, P Bauer, A Bento, C Bucci, L Canonica, X Defay, A Erb, FV Feilitzsch, NF Iachellini, P Gorla, A Guetlein, D Hauff, J Jochum, M Kiefer, H Kluck, H Kraus, J-C Lanfranchi, A Langenkaemper, J Loebell, M Mancuso, E Mondragon, A Muenster, L Oberauer, C Pagliarone, F Petricca, W Potzel, F Proebst, R Puig, F Reindl, J Rothe, K Schaffner, J Schieck, S Schoenert, W Seidel, M Stahlberg, L Stodolsky, C Strandhagen, R Strauss, A Tanzke, HHT Thi, C Tuerkoglu, M Uffinger, A Ulrich, I Usherov, S Wawoczny, M Willers, M Wuestrich, A Zoeller, CRESST Collaboration


Performance of the EDELWEISS-III experiment for direct dark matter searches

JOURNAL OF INSTRUMENTATION 12 (2017) ARTN P08010

E Armengaud, Q Arnaud, C Augier, A Benoit, L Berge, T Bergmann, J Billard, T de Boissiere, G Bres, A Broniatowski, V Brudanin, P Camus, A Cazes, M Chapellier, F Charlieux, M De Jesus, L Dumoulin, K Eitel, D Filosofov, N Foerster, N Fourches, G Garde, J Gascon, A Giuliani, M Grollier, M Gros, L Hehn, S Herve, G Heuermann, V Humbert, Y Jin, A Juillard, C Kefelian, M Kleifges, V Kozlov, H Kraus, VA Kudryavtsev, H Le-Sueur, J Lin, R Maisonobe, M Mancuso, S Marnieros, A Menshikov, X-F Navick, C Nones, E Olivieri, P Pari, B Paul, D Poda, E Queguiner, M Robinson, H Rodenas, S Rozov, V Sanglard, B Schmidt, S Scorza, B Siebenborn, D Tcherniakhovski, L Vagneron, M Weber, E Yakushev, X Zhang, A Zolotarova, E Collaboration


Identification of radiopure titanium for the LZ dark matter experiment and future rare event searches

ASTROPARTICLE PHYSICS 96 (2017) 1-10

DS Akerib, CW Akerlof, DY Akimov, SK Alsum, HM Araujo, IJ Arnquist, M Arthurs, X Bai, AJ Bailey, J Balajthy, S Balashov, MJ Barry, J Belle, P Beltrame, T Benson, EP Bernard, A Bernstein, TP Biesiadzinski, KE Boast, A Bolozdynya, B Boxer, R Bramante, P Bras, JH Buckley, VV Bugaev, R Bunker, S Burdin, JK Busenitz, C Carels, DL Carlsmith, B Carlson, MC Carmona-Benitez, C Chan, JJ Cherwinka, AA Chiller, C Chiller, A Cottle, R Coughlen, WW Craddock, A Currie, CE Dahl, TJR Davison, A Dobi, JEY Dobson, E Druszkiewicz, TK Edberg, WR Edwards, WT Emmet, CH Faham, S Fiorucci, T Fruth, RJ Gaitskell, N Gantos, VM Gehman, RM Gerhard, C Ghag, MGD Gilchriese, B Gomber, CR Hall, S Hans, K Hanzel, S Haselschwardt, SA Hertel, S Hillbrand, C Hjernfelt, MD Hoff, B Holbrook, E Holtom, EW Hoppe, JY-K Hor, M Horn, DQ Huang, TW Hurteau, CM Ignarra, RG Jacobsen, W Ji, A Kaboth, K Kamdin, K Kazkaz, D Khaitan, A Khazov, AV Khromov, AM Konovalov, EV Korolkova, M Koyuncu, H Kraus, HJ Krebs, VA Kudryavtsev, AV Kumpan, S Kyre, C Lee, HS Lee, J Lee, DS Leonard, R Leonard, KT Lesko, C Levy, F-T Liao, J Lin, A Lindote, RE Linehan, WH Lippincott, X Liu, MI Lopes, BL Paredes, W Lorenzon, S Luitz, P Majewski, A Manalaysay, L Manenti, RL Mannino, DJ Markley, TJ Martin, MF Marzioni, CT McConnell, DN McKinsey, D-M Mei, Y Meng, EH Miller, E Mizrachi, J Mock, ME Monzani, JA Morad, BJ Mount, ASJ Murphy, C Nehrkorn, HN Nelson, F Neves, JA Nikkel, J O'Dell, K O'Sullivan, I Olcina, MA Olevitch, KC Oliver-Mallory, KJ Palladino, EK Pease, A Piepke, S Powell, RM Preece, K Pushkin, BN Ratcliff, J Reichenbacher, L Reichhart, CA Rhyne, A Richards, JP Rodrigues, HJ Rose, R Rosero, P Rossiter, JS Saba, M Sarychev, RW Schnee, M Schubnell, PR Scovell, S Shaw, TA Shutt, C Silva, K Skarpaas, W Skulski, M Solmaz, VN Solovov, P Sorensen, VV Sosnovtsev, I Stancu, MR Stark, S Stephenson, TM Stiegler, K Stifter, TJ Sumner, M Szydagis, DJ Taylor, WC Taylor, D Temples, PA Terman, KJ Thomas, JA Thomson, DR Tiedt, M Timalsina, WH To, A Tomas, TE Tope, M Tripathi, L Tvrznikova, J Va'vra, A Vacheret, MGD van der Grinten, JR Verbus, CO Vuosalo, WL Waldron, R Wang, R Watson, RC Webb, W-Z Wei, M While, DT White, TJ Whitis, WJ Wisniewski, MS Witherell, FLH Wolfs, D Woodward, S Worm, J Xu, M Yeh, J Yin, C Zhang, LUX-ZEPLINLZ Collaboration

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