Confirmation of the spectral excess in DAMIC at SNOLAB with skipper CCDs

(DAMIC, DAMIC-M and SENSEI Collaborations)

doi:10.1103/PhysRevD.109.062007

Confirmation of the spectral excess in DAMIC at SNOLAB with skipper CCDs

(DAMIC, DAMIC-M and SENSEI Collaborations)

School of Physics and Astronomy

Research output: Contribution to journal › Article › peer-review

4 Scopus citations

Abstract

We present results from a 3.25 kg-day target exposure of two silicon charge-coupled devices (CCDs), each with 24 megapixels and skipper readout, deployed in the DAMIC setup at SNOLAB. With a reduction in pixel readout noise of a factor of 10 relative to the previous detector, we investigate the excess population of low-energy events in the CCD bulk previously observed above expected backgrounds. We address the dominant systematic uncertainty of the previous analysis through a depth fiducialization designed to reject surface backgrounds on the CCDs. The measured bulk ionization spectrum confirms the presence of an excess population of low-energy events in the CCD target with characteristic rate of ∼7 events per kg-day and electron-equivalent energies of ∼80 eV, whose origin remains unknown.

Original language	English
Article number	062007
Journal	Physical Review D
Volume	109
Issue number	6
DOIs	https://doi.org/10.1103/PhysRevD.109.062007
State	Published - 15 Mar 2024

Funding

Funders	Funder number
Kavli Institute for Cosmological Physics, University of Chicago
Ministry of Training, Colleges and Universities
Ministerio de Ciencia e Innovación
University of Chicago
Major Science Initiatives Fund
Swiss Canton of Zurich
Canada Foundation for Innovation
Kavli Foundation
Agencia Estatal de Investigación
Office of Science
University of Washington
European Research Council
Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung	153654, 200021_153654
U.S. Department of Energy	DE-AC02-05CH11231
Not added	ANR-11-IDEX-0004, ANR-11-IDEX-0004-02
Fermilab	DE-AC02-07CH11359
Horizon 2020 Framework Programme	788137
Heising-Simons Foundation	PHY-2110585, 79921
National Science Foundation	PHY-1812654, 2110585
Consejo Nacional de Ciencia y Tecnología	CF-2023-I-1169
Dirección General de Asuntos del Personal Académico, Universidad Nacional Autónoma de México	IN106322
Institut Lagrange de Paris Laboratoire d’Excellence	ANR-10-LABX-63
Instituto de Física de Cantabria	PID2019–109829 GB-I00

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10.1103/PhysRevD.109.062007

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title = "Confirmation of the spectral excess in DAMIC at SNOLAB with skipper CCDs",

abstract = "We present results from a 3.25 kg-day target exposure of two silicon charge-coupled devices (CCDs), each with 24 megapixels and skipper readout, deployed in the DAMIC setup at SNOLAB. With a reduction in pixel readout noise of a factor of 10 relative to the previous detector, we investigate the excess population of low-energy events in the CCD bulk previously observed above expected backgrounds. We address the dominant systematic uncertainty of the previous analysis through a depth fiducialization designed to reject surface backgrounds on the CCDs. The measured bulk ionization spectrum confirms the presence of an excess population of low-energy events in the CCD target with characteristic rate of ∼7 events per kg-day and electron-equivalent energies of ∼80 eV, whose origin remains unknown.",

author = "{(DAMIC, DAMIC-M and SENSEI Collaborations)} and A. Aguilar-Arevalo and I. Arnquist and N. Avalos and L. Barak and D. Baxter and X. Bertou and Bloch, {I. M.} and Botti, {A. M.} and M. Cababie and G. Cancelo and N. Castell{\'o}-Mor and Cervantes-Vergara, {B. A.} and Chavarria, {A. E.} and J. Cortabitarte-Guti{\'e}rrez and M. Crisler and J. Cuevas-Zepeda and A. Dastgheibi-Fard and {De Dominicis}, C. and O. Deligny and A. Drlica-Wagner and J. Duarte-Campderros and D'Olivo, {J. C.} and R. Essig and E. Estrada and J. Estrada and E. Etzion and F. Favela-Perez and N. Gadola and R. Ga{\"i}or and Holland, {S. E.} and T. Hossbach and L. Iddir and B. Kilminster and Y. Korn and A. Lantero-Barreda and I. Lawson and S. Lee and A. Letessier-Selvon and P. Loaiza and A. Lopez-Virto and S. Luoma and E. Marrufo-Villalpando and McGuire, {K. J.} and Moroni, {G. F.} and S. Munagavalasa and D. Norcini and A. Orly and G. Papadopoulos and S. Uemura and T. Volansky",

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doi = "10.1103/PhysRevD.109.062007",

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T1 - Confirmation of the spectral excess in DAMIC at SNOLAB with skipper CCDs

AU - (DAMIC, DAMIC-M and SENSEI Collaborations)

AU - Aguilar-Arevalo, A.

AU - Arnquist, I.

AU - Avalos, N.

AU - Barak, L.

AU - Baxter, D.

AU - Bertou, X.

AU - Bloch, I. M.

AU - Botti, A. M.

AU - Cababie, M.

AU - Cancelo, G.

AU - Castelló-Mor, N.

AU - Cervantes-Vergara, B. A.

AU - Chavarria, A. E.

AU - Cortabitarte-Gutiérrez, J.

AU - Crisler, M.

AU - Cuevas-Zepeda, J.

AU - Dastgheibi-Fard, A.

AU - De Dominicis, C.

AU - Deligny, O.

AU - Drlica-Wagner, A.

AU - Duarte-Campderros, J.

AU - D'Olivo, J. C.

AU - Essig, R.

AU - Estrada, E.

AU - Estrada, J.

AU - Etzion, E.

AU - Favela-Perez, F.

AU - Gadola, N.

AU - Gaïor, R.

AU - Holland, S. E.

AU - Hossbach, T.

AU - Iddir, L.

AU - Kilminster, B.

AU - Korn, Y.

AU - Lantero-Barreda, A.

AU - Lawson, I.

AU - Lee, S.

AU - Letessier-Selvon, A.

AU - Loaiza, P.

AU - Lopez-Virto, A.

AU - Luoma, S.

AU - Marrufo-Villalpando, E.

AU - McGuire, K. J.

AU - Moroni, G. F.

AU - Munagavalasa, S.

AU - Norcini, D.

AU - Orly, A.

AU - Papadopoulos, G.

AU - Uemura, S.

AU - Volansky, T.

PY - 2024/3/15

Y1 - 2024/3/15

N2 - We present results from a 3.25 kg-day target exposure of two silicon charge-coupled devices (CCDs), each with 24 megapixels and skipper readout, deployed in the DAMIC setup at SNOLAB. With a reduction in pixel readout noise of a factor of 10 relative to the previous detector, we investigate the excess population of low-energy events in the CCD bulk previously observed above expected backgrounds. We address the dominant systematic uncertainty of the previous analysis through a depth fiducialization designed to reject surface backgrounds on the CCDs. The measured bulk ionization spectrum confirms the presence of an excess population of low-energy events in the CCD target with characteristic rate of ∼7 events per kg-day and electron-equivalent energies of ∼80 eV, whose origin remains unknown.

AB - We present results from a 3.25 kg-day target exposure of two silicon charge-coupled devices (CCDs), each with 24 megapixels and skipper readout, deployed in the DAMIC setup at SNOLAB. With a reduction in pixel readout noise of a factor of 10 relative to the previous detector, we investigate the excess population of low-energy events in the CCD bulk previously observed above expected backgrounds. We address the dominant systematic uncertainty of the previous analysis through a depth fiducialization designed to reject surface backgrounds on the CCDs. The measured bulk ionization spectrum confirms the presence of an excess population of low-energy events in the CCD target with characteristic rate of ∼7 events per kg-day and electron-equivalent energies of ∼80 eV, whose origin remains unknown.

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DO - 10.1103/PhysRevD.109.062007

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AN - SCOPUS:85188788475

SN - 2470-0010

VL - 109

JO - Physical Review D

JF - Physical Review D

IS - 6

M1 - 062007

ER -

Confirmation of the spectral excess in DAMIC at SNOLAB with skipper CCDs

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