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Investigating the sources of low-energy events in a SuperCDMS-HVeV detector

Albakry, M. F. and Alkhatib, I. and Amaral, D. W. P. and Aralis, T. and Aramaki, T. and Arnquist, I. J. and Ataee Langroudy, I. and Azadbakht, E. and Banik, S. and Bathurst, C. and Bauer, D. A. and Bhattacharyya, R. and Brink, P. L. and Bunker, R. and Cabrera, B. and Calkins, R. and Cameron, R. A. and Cartaro, C. and Cerdeño, D. G. and Chang, Y.-Y. and Chaudhuri, M. and Chen, R. and Chott, N. and Cooley, J. and Coombes, H. and Corbett, J. and Cushman, P. and De Brienne, F. and Dharani, S. and di Vacri, M. L. and Diamond, M. D. and Fascione, E. and Figueroa-Feliciano, E. and Fink, C. W. and Fouts, K. and Fritts, M. and Gerbier, G. and Germond, R. and Ghaith, M. and Golwala, S. R. and Hall, J. and Hassan, N. and Hines, B. A. and Hollister, M. I. and Hong, Z. and Hoppe, E. W. and Hsu, L. and Huber, M. E. and Iyer, V. and Jastram, A. and Kashyap, V. K. S. and Kelsey, M. H. and Kubik, A. and Kurinsky, N. A. and Lawrence, R. E. and Lee, M. and Li, A. and Liu, J. and Liu, Y. and Loer, B. and Lopez Asamar, E. and Lukens, P. and MacFarlane, D. B. and Mahapatra, R. and Mandic, V. and Mast, N. and Mayer, A. J. and Meyer zu Theenhausen, H. and Michaud, É. and Michielin, E. and Mirabolfathi, N. and Mohanty, B. and Nagorny, S. and Nelson, J. and Neog, H. and Novati, V. and Orrell, J. L. and Osborne, M. D. and Oser, S. M. and Page, W. A. and Partridge, R. and Pedreros, D. S. and Podviianiuk, R. and Ponce, F. and Poudel, S. and Pradeep, A. and Pyle, M. and Rau, W. and Reid, E. and Ren, R. and Reynolds, T. and Roberts, A. and Robinson, A. E. and Saab, T. and Sadoulet, B. and Saikia, I. and Sander, J. and Sattari, A. and Schmidt, B. and Schnee, R. W. and Scorza, S. and Serfass, B. and Poudel, S. S. and Sincavage, D. J. and Stanford, C. and Street, J. and Sun, H. and Thasrawala, F. K. and Toback, D. and Underwood, R. and Verma, S. and Villano, A. N. and von Krosigk, B. and Watkins, S. L. and Wen, O. and Williams, Z. and Wilson, M. J. and Winchell, J. and Wykoff, K. and Yellin, S. and Young, B. A. and Yu, T. C. and Zatschler, B. and Zatschler, S. and Zaytsev, A. and Zhang, E. and Zheng, L. and Zuber, S. (2022) Investigating the sources of low-energy events in a SuperCDMS-HVeV detector. Physical Review D, 105 (11). Art. No. 112006. ISSN 2470-0010. doi:10.1103/physrevd.105.112006.

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Recent experiments searching for sub−GeV/c² dark matter have observed event excesses close to their respective energy thresholds. Although specific to the individual technologies, the measured excess event rates have been consistently reported at or below event energies of a few-hundred eV, or with charges of a few electron-hole pairs. In the present work, we operated a 1-g silicon SuperCDMS-HVeV detector at three voltages across the crystal (0, 60 and 100 V). The 0 V data show an excess of events in the tens of eV region. Despite this event excess, we demonstrate the ability to set a competitive exclusion limit on the spin-independent dark matter–nucleon elastic scattering cross section for dark matter masses of O(100) MeV/c², enabled by operation of the detector at 0 V potential and achievement of a very low O(10) eV threshold for nuclear recoils. Comparing the data acquired at 0, 60 and 100 V potentials across the crystal, we investigated possible sources of the unexpected events observed at low energy. The data indicate that the dominant contribution to the excess is consistent with a hypothesized luminescence from the printed circuit boards used in the detector holder.

Item Type:Article
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URLURL TypeDescription Paper
Chang, Y.-Y.0000-0002-6441-980X
Golwala, S. R.0000-0002-1098-7174
Ren, R.0000-0002-4804-4825
Additional Information:Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3. (Received 21 April 2022; accepted 31 May 2022; published 22 June 2022) We thank Noemie Bastidon for her work in the preliminary design of our optical fiber setup and wire bonding. We gratefully acknowledge support from the U.S. Department of Energy (DOE) Office of High Energy Physics and from the National Science Foundation (NSF). This work was supported in part under NSF Grants No. 1809730 and No. 1707704, as well as by the Arthur B. McDonald Canadian Astroparticle Physics Research Institute, NSERC Canada, the Canada Excellence Research Chair Fund, Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) under Project No. 420484612 and under Germany’s Excellence Strategy—EXC 2121 “Quantum Universe”—390833306, and the Department of Atomic Energy Government of India (DAE) under the project “Research in basic sciences” (Dark matter). Fermilab is operated by Fermi Research Alliance, LLC, under Contract No. DE-AC02-37407CH11359 with the U.S. Department of Energy. Pacific Northwest National Laboratory (PNNL) is operated by Battelle Memorial Institute for the DOE under Contract No. DE-AC05-76RL01830. SLAC is operated under Contract No. DEAC02-76SF00515 with the United States Department of Energy.
Group:Astronomy Department
Funding AgencyGrant Number
Arthur B. McDonald Canadian Astroparticle Physics Research InstituteUNSPECIFIED
Natural Sciences and Engineering Research Council of Canada (NSERC)UNSPECIFIED
Canada Excellence Research Chair FundUNSPECIFIED
Deutsche Forschungsgemeinschaft (DFG)420484612
Deutsche Forschungsgemeinschaft (DFG)390833306
Department of Atomic Energy (India)UNSPECIFIED
Department of Energy (DOE)DE-AC02-37407CH11359
Department of Energy (DOE)DE-AC05-76RL01830
Department of Energy (DOE)DEAC02-76SF00515
Issue or Number:11
Record Number:CaltechAUTHORS:20220715-332445000
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:115630
Deposited By: George Porter
Deposited On:18 Jul 2022 14:53
Last Modified:18 Jul 2022 14:53

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