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)

Universidad Nacional Autónoma de México
Pacific Northwest National Laboratory
Universidad Nacional de Cuyo
Tel Aviv University
Fermi National Accelerator Laboratory
University of California at Berkeley
Lawrence Berkeley National Laboratory
Universidad de Buenos Aires
Instituto de Física de Buenos Aires (IFIBA)
Universidad de Cantabria
University of Washington
The University of Chicago
Université Grenoble Alpes
Sorbonne Université
Université Paris-Saclay
University of Zurich
SNOLAB

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

12 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 - Mar 15 2024

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10.1103/PhysRevD.109.062007

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@article{02611beb3d614e3da20426d3ab1f497b,

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. Paul and Perez, \{S. E.\}",

note = "Publisher Copyright: {\textcopyright} 2024 American Physical Society. ",

year = "2024",

month = mar,

day = "15",

doi = "10.1103/PhysRevD.109.062007",

language = "English",

volume = "109",

journal = "Physical Review D",

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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 - Paul, S.

AU - Perez, S. E.

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.

UR - https://www.scopus.com/pages/publications/85188788475

U2 - 10.1103/PhysRevD.109.062007

DO - 10.1103/PhysRevD.109.062007

M3 - Article

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

Abstract

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