Confirmation of the spectral excess in DAMIC at SNOLAB with skipper CCDs
Por:
Aguilar-Arevalo A., Arnquist I., Avalos N., Barak L., Baxter D., Bertou X., Bloch I.M., Botti A.M., Cababie M., Cancelo G., Castelló-Mor N., Cervantes-Vergara B.A., Chavarria A.E., Cortabitarte-Gutiérrez J., Crisler M., Cuevas-Zepeda J., Dastgheibi-Fard A., De Dominicis C., Deligny O., Drlica-Wagner A., Duarte-Campderros J., D'Olivo J.C., Essig R., Estrada E., Estrada J., Etzion E., Favela-Perez F., Gadola N., Gaïor R., Holland S.E., Hossbach T., Iddir L., Kilminster B., Korn Y., Lantero-Barreda A., Lawson I., Lee S., Letessier-Selvon A., Loaiza P., Lopez-Virto A., Luoma S., Marrufo-Villalpando E., McGuire K.J., Moroni G.F., Munagavalasa S., Norcini D., Orly A., Papadopoulos G., Paul S., Perez S.E., Piers A., Privitera P., Robmann P., Rodrigues D., Saffold N.A., Scorza S., Settimo M., Singal A., Smida R., Sofo-Haro M., Stefanazzi L., Stifter K., Tiffenberg J., Traina M., Uemura S., Vila I., Vilar R., Volansky T., Warot G., Yajur R., Yu T.-T., Zopounidis J.-P.
Publicada:
1 ene 2024
Resumen:
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. © 2024 American Physical Society.
Filiaciones:
Aguilar-Arevalo A.:
Universidad Nacional Autónoma de México, Mexico City, Mexico
Arnquist I.:
Pacific Northwest National Laboratory (PNNL), Richland, WA, United States
Avalos N.:
Centro Atómico Bariloche and Instituto Balseiro, Comisión Nacional de Energía Atómica (CNEA), Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Universidad Nacional de Cuyo (UNCUYO), San Carlos de Bariloche, Argentina
Barak L.:
School of Physics and Astronomy, Tel-Aviv University, Tel-Aviv, Israel
Baxter D.:
Fermi National Accelerator Laboratory, Batavia, IL, United States
Bertou X.:
Centro Atómico Bariloche and Instituto Balseiro, Comisión Nacional de Energía Atómica (CNEA), Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Universidad Nacional de Cuyo (UNCUYO), San Carlos de Bariloche, Argentina
Bloch I.M.:
Berkeley Center for Theoretical Physics, University of California, Berkeley, CA, United States
Lawrence Berkeley National Laboratory, Berkeley, CA, United States
Botti A.M.:
Fermi National Accelerator Laboratory, Batavia, IL, United States
Cababie M.:
Fermi National Accelerator Laboratory, Batavia, IL, United States
Universidad de Buenos Aires, Facultad de Ciencias Exactas y Naturales, Departamento de Física, Buenos Aires, Argentina
CONICET, Universidad de Buenos Aires, Instituto de Física de Buenos Aires (IFIBA), Buenos Aires, Argentina
Cancelo G.:
Fermi National Accelerator Laboratory, Batavia, IL, United States
Castelló-Mor N.:
Instituto de Física de Cantabria (IFCA), CSIC, Universidad de Cantabria, Santander, Spain
Cervantes-Vergara B.A.:
Universidad Nacional Autónoma de México, Mexico City, Mexico
Chavarria A.E.:
Center for Experimental Nuclear Physics and Astrophysics, University of Washington, Seattle, WA, United States
Cortabitarte-Gutiérrez J.:
Instituto de Física de Cantabria (IFCA), CSIC, Universidad de Cantabria, Santander, Spain
Crisler M.:
Fermi National Accelerator Laboratory, Batavia, IL, United States
Cuevas-Zepeda J.:
Kavli Institute for Cosmological Physics and the Enrico Fermi Institute, The University of Chicago, Chicago, IL, United States
Dastgheibi-Fard A.:
LPSC LSM, CNRS, IN2P3, Université Grenoble-Alpes, Grenoble, France
De Dominicis C.:
Laboratoire de Physique Nucléaire et des Hautes Énergies (LPNHE), Sorbonne Universite, Université Paris Cite, CNRS, IN2P3, Paris, France
Deligny O.:
CNRS, IN2P3, IJCLab, Université Paris-Saclay, Orsay, France
Drlica-Wagner A.:
Fermi National Accelerator Laboratory, Batavia, IL, United States
Kavli Institute for Cosmological Physics and the Enrico Fermi Institute, The University of Chicago, Chicago, IL, United States
Department of Astronomy and Astrophysics, University of Chicago, Chicago, IL, United States
Duarte-Campderros J.:
Instituto de Física de Cantabria (IFCA), CSIC, Universidad de Cantabria, Santander, Spain
D'Olivo J.C.:
Universidad Nacional Autónoma de México, Mexico City, Mexico
Essig R.:
C.N. Yang Institute for Theoretical Physics, Stony Brook University, Stony Brook, NY, United States
Estrada E.:
Centro Atómico Bariloche and Instituto Balseiro, Comisión Nacional de Energía Atómica (CNEA), Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Universidad Nacional de Cuyo (UNCUYO), San Carlos de Bariloche, Argentina
Estrada J.:
Fermi National Accelerator Laboratory, Batavia, IL, United States
Etzion E.:
School of Physics and Astronomy, Tel-Aviv University, Tel-Aviv, Israel
Favela-Perez F.:
Universidad Nacional Autónoma de México, Mexico City, Mexico
Gadola N.:
Universitat Zürich Physik Institut, Zurich, Switzerland
Gaïor R.:
Laboratoire de Physique Nucléaire et des Hautes Énergies (LPNHE), Sorbonne Universite, Université Paris Cite, CNRS, IN2P3, Paris, France
Holland S.E.:
Lawrence Berkeley National Laboratory, Berkeley, CA, United States
Hossbach T.:
Pacific Northwest National Laboratory (PNNL), Richland, WA, United States
Iddir L.:
Laboratoire de Physique Nucléaire et des Hautes Énergies (LPNHE), Sorbonne Universite, Université Paris Cite, CNRS, IN2P3, Paris, France
Kilminster B.:
Universitat Zürich Physik Institut, Zurich, Switzerland
Korn Y.:
School of Physics and Astronomy, Tel-Aviv University, Tel-Aviv, Israel
Lantero-Barreda A.:
Instituto de Física de Cantabria (IFCA), CSIC, Universidad de Cantabria, Santander, Spain
Lawson I.:
SNOLAB, Lively, ON, Canada
Lee S.:
Universitat Zürich Physik Institut, Zurich, Switzerland
Letessier-Selvon A.:
Laboratoire de Physique Nucléaire et des Hautes Énergies (LPNHE), Sorbonne Universite, Université Paris Cite, CNRS, IN2P3, Paris, France
Loaiza P.:
CNRS, IN2P3, IJCLab, Université Paris-Saclay, Orsay, France
Lopez-Virto A.:
Instituto de Física de Cantabria (IFCA), CSIC, Universidad de Cantabria, Santander, Spain
Luoma S.:
SNOLAB, Lively, ON, Canada
Marrufo-Villalpando E.:
Kavli Institute for Cosmological Physics and the Enrico Fermi Institute, The University of Chicago, Chicago, IL, United States
McGuire K.J.:
Center for Experimental Nuclear Physics and Astrophysics, University of Washington, Seattle, WA, United States
Moroni G.F.:
Fermi National Accelerator Laboratory, Batavia, IL, United States
Munagavalasa S.:
Kavli Institute for Cosmological Physics and the Enrico Fermi Institute, The University of Chicago, Chicago, IL, United States
Norcini D.:
Kavli Institute for Cosmological Physics and the Enrico Fermi Institute, The University of Chicago, Chicago, IL, United States
Orly A.:
School of Physics and Astronomy, Tel-Aviv University, Tel-Aviv, Israel
Papadopoulos G.:
Laboratoire de Physique Nucléaire et des Hautes Énergies (LPNHE), Sorbonne Universite, Université Paris Cite, CNRS, IN2P3, Paris, France
Paul S.:
Kavli Institute for Cosmological Physics and the Enrico Fermi Institute, The University of Chicago, Chicago, IL, United States
Perez S.E.:
Fermi National Accelerator Laboratory, Batavia, IL, United States
Universidad de Buenos Aires, Facultad de Ciencias Exactas y Naturales, Departamento de Física, Buenos Aires, Argentina
CONICET, Universidad de Buenos Aires, Instituto de Física de Buenos Aires (IFIBA), Buenos Aires, Argentina
Piers A.:
Center for Experimental Nuclear Physics and Astrophysics, University of Washington, Seattle, WA, United States
Privitera P.:
Kavli Institute for Cosmological Physics and the Enrico Fermi Institute, The University of Chicago, Chicago, IL, United States
Laboratoire de Physique Nucléaire et des Hautes Énergies (LPNHE), Sorbonne Universite, Université Paris Cite, CNRS, IN2P3, Paris, France
Robmann P.:
Universitat Zürich Physik Institut, Zurich, Switzerland
Rodrigues D.:
Fermi National Accelerator Laboratory, Batavia, IL, United States
Universidad de Buenos Aires, Facultad de Ciencias Exactas y Naturales, Departamento de Física, Buenos Aires, Argentina
CONICET, Universidad de Buenos Aires, Instituto de Física de Buenos Aires (IFIBA), Buenos Aires, Argentina
Saffold N.A.:
Fermi National Accelerator Laboratory, Batavia, IL, United States
Scorza S.:
SNOLAB, Lively, ON, Canada
Settimo M.:
SUBATECH, Nantes Université, IMT Atlantique, CNRS, IN2P3, Nantes, France
Singal A.:
C.N. Yang Institute for Theoretical Physics, Stony Brook University, Stony Brook, NY, United States
Department of Physics and Astronomy, Stony Brook University, Stony Brook, NY, United States
Smida R.:
Kavli Institute for Cosmological Physics and the Enrico Fermi Institute, The University of Chicago, Chicago, IL, United States
Sofo-Haro M.:
Fermi National Accelerator Laboratory, Batavia, IL, United States
Universidad Nacional de Córdoba, IFEG (CONICET) & RA0 (CNEA), Cordoba, Argentina
Stefanazzi L.:
Fermi National Accelerator Laboratory, Batavia, IL, United States
Stifter K.:
Fermi National Accelerator Laboratory, Batavia, IL, United States
Tiffenberg J.:
Fermi National Accelerator Laboratory, Batavia, IL, United States
Traina M.:
Center for Experimental Nuclear Physics and Astrophysics, University of Washington, Seattle, WA, United States
Uemura S.:
Fermi National Accelerator Laboratory, Batavia, IL, United States
Vila I.:
Instituto de Física de Cantabria (IFCA), CSIC, Universidad de Cantabria, Santander, Spain
Vilar R.:
Instituto de Física de Cantabria (IFCA), CSIC, Universidad de Cantabria, Santander, Spain
Volansky T.:
School of Physics and Astronomy, Tel-Aviv University, Tel-Aviv, Israel
Warot G.:
LPSC LSM, CNRS, IN2P3, Université Grenoble-Alpes, Grenoble, France
Yajur R.:
Kavli Institute for Cosmological Physics and the Enrico Fermi Institute, The University of Chicago, Chicago, IL, United States
Yu T.-T.:
Department of Physics, Institute for Fundamental Science, University of Oregon, Eugene, OR, United States
Zopounidis J.-P.:
Laboratoire de Physique Nucléaire et des Hautes Énergies (LPNHE), Sorbonne Universite, Université Paris Cite, CNRS, IN2P3, Paris, France
Green Submitted
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