Publications


Measurement of the gamma ray background in the Davis cavern at the Sanford Underground Research Facility

ASTROPARTICLE PHYSICS 116 (2020) UNSP 102391

DS Akerib, CW Akerlof, SK Alsum, N Angelides, HM Araujo, JE Armstrong, M Arthurs, X Bai, J Balajthy, S Balashov, A Baxter, EP Bernard, A Biekert, TP Biesiadzinski, KE Boast, B Boxer, P Bras, JH Buckley, VV Bugaev, S Burdin, JK Busenitz, C Carels, DL Carlsmith, MC Carmona-Benitez, M Cascella, C Chan, A Cole, A Cottle, JE Cutter, CE Dahl, L de Viveiros, JEY Dobson, E Druszkiewicz, TK Edberg, A Fan, S Fiorucci, H Flaecher, T Fruth, RJ Gaitskell, J Genovesi, C Ghag, MGD Gilchriese, S Gokhale, MGD van der Grinten, CR Hall, S Hans, J Harrison, SJ Haselschwardt, SA Hertel, JY-K Hor, M Horn, DQ Huang, CM Ignarra, O Jahangir, W Ji, J Johnson, AC Kaboth, K Kamdin, D Khaitan, A Khazov, WT Kim, CD Kocher, L Korley, EV Korolkova, J Kras, H Kraus, SW Kravitz, L Kreczko, B Krikler, VA Kudryavtsev, EA Leason, J Lee, DS Leonard, KT Lesko, C Levy, J Li, J Liao, F-T Liao, J Lin, A Lindote, R Linehan, WH Lippincott, R Liu, X Liu, C Loniewski, MI Lopes, BL Paredes, W Lorenzon, S Luitz, JM Lyle, PA Majewski, A Manalaysay, L Manenti, RL Mannino, N Marangou, MF Marzioni, DN McKinsey, J McLaughlin, Y Meng, EH Miller, ME Monzani, JA Morad, E Morrison, BJ Mount, ASJ Murphy, D Naim, A Naylor, C Nedlik, C Nehrkorn, HN Nelson, F Neves, J Nikoleyczik, A Nilima, I Olcina, KC Oliver-Mallory, S Pal, KJ Palladino, EK Pease, BP Penning, G Pereira, A Piepke, K Pushkin, J Reichenbacher, CA Rhyne, Q Riffard, GRC Rischbieter, JP Rodrigues, R Rosero, P Rossiter, G Rutherford, ABMR Sazzad, RW Schnee, M Schubnell, PR Scovell, D Seymour, S Shaw, TA Shutt, JJ Silk, C Silva, M Solmaz, VN Solovov, P Sorensen, I Stancul, A Stevens, TM Stiegler, K Stifter, M Szydagis, WC Taylor, R Taylors, D Temples, PA Terman, DR Tiedt, M Timalsina, A Tomas, M Tripathi, L Tvrznikova, U Utku, S Uvarov, A Vacheret, JJ Wang, JR Watson, RC Webb, RG White, TJ Whitis, FLH Wolfs, D Woodward, J Yin, LUX-ZEPLINLZ Collaboration


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

Journal of Physics: Conference Series 1342 (2020)

F Petricca, G Angloher, P Bauer, A Bento, C Bucci, L Canonica, X Defay, A Erb, FV 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, 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, HHT Thi, C Türkoǧlu, A Ulrich, I Usherov, S Wawoczny, M Willers, M Wüstrich

© Published under licence by IOP Publishing Ltd. 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.


Searches for Light Dark Matter with the CRESST-III Experiment

JOURNAL OF LOW TEMPERATURE PHYSICS (2020)

M Mancuso, AH Abdelhameed, G Angloher, R Breier, P Bauer, A Bento, E Bertoldo, C Bucci, L Canonica, A D'Addabbo, S Di Lorenzo, A Erb, F von Feilitzsch, N Ferreiro Iachellini, S Fichtinger, A Fuss, P Gorla, D Hauff, M Jeskovsky, J Jochum, J Kaizer, A Kinast, H Kluck, H Kraus, A Langenkaemper, V Mokina, E Mondragon, M Olmi, T Ortmann, C Pagliarone, V Palusova, L Pattavina, F Petricca, W Potzel, P Povinec, 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, J Zeman, CRESST Collaboration


The LUX-ZEPLIN (LZ) experiment

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT 953 (2020) ARTN 163047

DS Akerib, CW Akerlof, DY Akimov, A Alquahtani, SK Alsum, TJ Anderson, N Angelides, HM Araujo, A Arbuckle, JE Armstrong, M Arthurs, H Auyeung, X Bai, AJ Bailey, J Balajthy, S Balashov, J Bang, MJ Barry, J Barthel, D Bauer, P Bauer, A Baxter, J Belle, P Beltrame, J Bensinger, T Benson, EP Bernard, A Bernstein, A Bhatti, A Biekert, TP Biesiadzinski, B Birrittella, KE Boast, AI Bolozdynya, EM Boulton, B Boxer, R Bramante, S Branson, P Bras, M Breidenbach, JH Buckley, VV Bugaev, R Bunker, S Burdin, JK Busenitz, JS Campbell, C Carels, DL Carlsmith, B Carlson, MC Carmona-Benitez, M Cascella, C Chan, JJ Cherwinka, AA Chiller, C Chiller, NI Chott, A Cole, J Coleman, D Colling, RA Conley, A Cottle, R Coughlen, WW Craddock, D Curran, A Currie, JE Cutter, JP da Cunha, CE Dahl, S Dardin, S Dasu, J Davis, TJR Davison, L de Viveiros, N Decheine, A Dobi, JEY Dobson, E Druszkiewicz, A Dushkin, TK Edberg, WR Edwards, BN Edwards, J Edwards, MM Elnimr, WT Emmet, SR Eriksen, CH Faham, A Fan, S Fayer, S Fiorucci, H Flaecher, IMF Florang, P Ford, VB Francis, F Froborg, T Fruth, RJ Gaitskell, NJ Gantos, D Garcia, A Geffre, VM Gehman, R Gelfand, J Genovesi, RM Gerhard, C Ghag, E Gibson, MGD Gilchriese, S Gokhale, B Gomber, TG Gonda, A Greenall, S Greenwood, G Gregerson, MGD van der Grinten, CB Gwilliam, CR Hall, D Hamilton, S Hans, K Hanzel, T Harrington, A Harrison, C Hasselkus, SJ Haselschwardt, D Hemer, SA Hertel, J Heise, S Hillbrand, O Hitchcock, C Hjemfelt, MD Hoff, B Holbrook, E Holtom, JY-K Hor, M Horn, DQ Huang, TW Hurteau, CM Ignarra, MN Irving, RG Jacobsen, O Jahangir, SN Jeffery, W Ji, M Johnson, J Johnson, P Johnson, WG Jones, AC Kaboth, A Kamaha, K Kamdin, V Kasey, K Kazkaz, J Keefner, D Khaitan, M Khaleeq, A Khazov, AV Khromov, I Khurana, YD Kim, WT Kim, CD Kocher, AM Konovalov, L Korley, EV Korolkova, M Koyuncu, J Kras, H Kraus, SW Kravitz, HJ Krebs, L Kreczko, B Krikler, VA Kudryavtsev, AV Kumpan, S Kyre, AR Lambert, B Landerud, NA Larsen, A Laundrie, EA Leason, HS Lee, J Lee, C Lee, BG Lenardo, DS Leonard, R Leonard, KT Lesko, C Levy, J Li, Y Liu, J Liao, F-T Liao, J Lin, A Lindote, R Linehan, WH Lippincott, R Liu, X Liu, C Loniewski, MI Lopes, BL Paredes, W Lorenzon, D Lucero, S Luitz, JM Lyle, C Lynch, PA Majewski, J Makkinje, DC Malling, A Manalaysay, L Manenti, RL Mannino, N Marangou, DJ Markley, P MarrLaundrie, TJ Martin, MF Marzioni, C Maupin, CT McConnell, DN McKinsey, J McLaughlin, D-M Mei, Y Meng, EH Miller, ZJ Minaker, E Mizrachi, J Mock, D Molash, A Monte, ME Monzani, JA Morad, E Morrison, BJ Mount, ASJ Murphy, D Naim, A Naylor, C Nedlik, C Nehrkorn, HN Nelson, J Nesbit, F Neves, JA Nikkel, JA Nikoleyczik, A Nilima, J O'Dell, H Oh, FG O'Neill, K O'Sullivan, I Olcina, MA Olevitch, KC Oliver-Mallory, L Oxborough, A Pagac, D Pagenkopf, S Pal, KJ Palladino, VM Palmaccio, J Palmer, M Pangilinan, SJ Patton, EK Pease, BP Penning, G Pereira, C Pereira, IB Peterson, A Piepke, S Pierson, S Powell, RM Preece, K Pushkin, Y Qie, M Racine, BN Ratcliff, J Reichenbacher, L Reichhart, CA Rhyne, A Richards, Q Riffard, GRC Rischbieter, JP Rodrigues, HJ Rose, R Rosero, P Rossiter, R Rucinski, G Rutherford, D Rynders, JS Saba, L Sabarots, D Santone, M Sarychev, ABMR Sazzad, RW Schnee, M Schubnell, PR Scovell, M Severson, D Seymour, S Shaw, GW Shutt, TA Shutt, JJ Silk, C Silva, K Skarpaas, W Skulski, AR Smith, RJ Smith, RE Smith, J So, M Solmaz, VN Solovov, P Sorensen, VV Sosnovtsev, I Stancu, MR Stark, S Stephenson, N Stern, A Stevens, TM Stiegler, K Stifter, R Studley, TJ Sumner, K Sundarnath, P Sutcliffe, N Swanson, M Szydagis, M Tan, WC Taylor, R Taylor, DJ Taylor, D Temples, BP Tennyson, PA Terman, KJ Thomas, JA Thomson, DR Tiedt, M Timalsina, WH To, A Tomas, TE Tope, M Tripathi, DR Tronstad, CE Tull, W Turner, L Tvrznikova, M Utes, U Utku, S Uvarov, J Va'vra, A Vacheret, A Vaitkus, JR Verbus, T Vietanen, E Voirin, CO Vuosalo, S Walcott, WL Waldron, K Walker, JJ Wang, R Wang, L Wang, Y Wang, JR Watson, J Migneault, S Weatherly, RC Webb, W-Z Wei, M While, RG White, JT White, DT White, TJ Whitis, WJ Wisniewski, K Wilson, MS Witherell, FLH Wolfs, JD Wolfs, D Woodward, SD Worm, X Xiang, Q Xiao, J Xu, M Yeh, J Yin, I Young, C Zhang


First results from the CRESST-III low-mass dark matter program

Physical Review D American Physical Society 100 (2019) 102002

AH Abdelhameed, S Di Lorenzo, A Erb, S Fichtinger, FV Feilitzsch, N Ferreiro Iachellini, A Fuss, P Gorla, D Hauff, J Jochum, A Kinast, H Kraus, H Kluck, A Langenkämper, M Mancuso, V Mokina, E Mondragon, A Münster, M Olmi, T Ortmann, C Pagliarone, L Pattavina, F Petricca, W Potzel, F Reindl

The CRESST experiment is a direct dark matter search which aims to measure interactions of potential dark matter particles in an Earth-bound detector. With the current stage, CRESST-III, we focus on a low energy threshold for increased sensitivity towards light dark matter particles. In this paper we describe the analysis of one detector operated in the first run of CRESST-III (05/2016–02/2018) achieving a nuclear recoil threshold of 30.1 eV. This result was obtained with a 23.6 g CaWO 4 crystal operated as a cryogenic scintillating calorimeter in the CRESST setup at the Laboratori Nazionali del Gran Sasso (LNGS). Both the primary phonon (heat) signal and the simultaneously emitted scintillation light, which is absorbed in a separate silicon-on-sapphire light absorber, are measured with highly sensitive transition edge sensors operated at ∼ 15     mK . The unique combination of these sensors with the light element oxygen present in our target yields sensitivity to dark matter particle masses as low as 160     MeV / c 2 .


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.

The European physical journal. C, Particles and fields 79 (2019) 881-

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 Jes Kovský, 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 Palus Ová, 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

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 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±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 Springer Nature Publishing Group 9 (2019) 5274

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

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 AIP Publishing 115 (2019) 081103

H Kraus, VB Mykhaylyk, V Kapustianyk, M Rudko


Bright and fast scintillation of organolead perovskite MAPbBr₃ at low temperatures

Materials Horizons Royal Society of Chemistry (2019)

V Mykhaylyk, H Kraus, M Saliba

We report the excellent scintillation properties of MAPbBr3, an organic–inorganic trihalide perovskite (OTP). The characteristic scintillation time constants were determined using pulsed monochromatic 14 keV X-rays from a synchrotron. We find that between 50 and 130 K the MAPbBr3 crystal exhibits a very fast and intense scintillation response, with the fast (τf) and slow (τs) decay components reaching 0.1 and 1 ns, respectively. The light yield of MAPbBr3 is estimated to be 90 000 ± 18 000 ph MeV−1 at 77 K and 116 000 ± 23 000 ph MeV−1 at 8 K.


Lithium-Containing Crystals for Light Dark Matter Search Experiments

Journal of Low Temperature Physics (2019)

E Bertoldo, AH Abdelhameed, G Angloher, P Bauer, A Bento, R Breier, C Bucci, L Canonica, A D’Addabbo, S Di Lorenzo, A Erb, FV Feilitzsch, N Ferreiro Iachellini, S Fichtinger, D Fuchs, A Fuss, P Gorla, D Hauff, M Ješkovský, J Jochum, J Kaizer, 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, M Willers, V Zema, J Zeman, M Brützam, S Ganschow

© 2019, The Author(s). In the current direct dark matter search landscape, the leading experiments in the sub-GeV mass region mostly rely on cryogenic techniques which employ crystalline targets. One attractive type of crystals for these experiments is those containing lithium, due to the fact that 7Li is an ideal candidate to study spin-dependent dark matter interactions in the low mass region. Furthermore, 6Li can absorb neutrons, a challenging background for dark matter experiments, through a distinctive signature which allows the monitoring of the neutron flux directly on site. In this work, we show the results obtained with three different detectors based on LiAlO 2, a target crystal never used before in cryogenic experiments.


Geant4-based electromagnetic background model for the CRESST dark matter experiment (vol 79, 881, 2019)

EUROPEAN PHYSICAL JOURNAL C 79 (2019) ARTN 987

AH Abdelhameed, G Angloher, P Bauer, A Bento, E Bertoldo, R Breier, C Bucci, L Canonica, A D'Addabbo, S Di Lorenzo, A Erb, FV Feilitzsch, NF Iachellini, S Fichtinger, A Fuss, P Gorla, D Hauff, M Jeskovsky, J Jochum, J Kaizer, A Kinast, H Kluck, H Kraus, A Langenkaemper, M Mancuso, V Mokina, E Mondragon, M Olmi, T Ortmann, C Pagliarone, V Palusova, L Pattavina, F Petricca, W Potzel, P Povinec, 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, J Zeman


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

Journal of Physical Chemistry Letters American Chemical Society 9 (2018) 4502–4511-

CL Davies, J Borchert, RL Milot, CQ Xia, MB Johnston, H Kraus, L 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.


The effects of doping density and temperature on the optoelectronic properties of formamidinium tin triiodide thin films

Advanced Materials Wiley 30 (2018) 1804506-

RL Milot, MT Klug, C Davies, Z Wang, HAP Kraus, HJ Snaith, MB Johnston, LM Herz

Intrinsic and extrinsic optoelectronic properties are unraveled for formamidinium tin triiodide (FASnI3) thin films, whose background hole doping density was 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 ~300meV beyond the band gap 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 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 cm2V-1s-1at room temperature and 470 cm2V-1s-1 at 50 K. Intra-excitonic transitions observed in the THz-frequency photoconductivity spectra at 5K reveal an exciton binding energy of only 3.1 meV for FASnI3, in agreement with the low bandgap energy exhibited by this perovskite.


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.

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