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

Fuente: arXiv

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Main Authors:	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.
Format:	Preprint
Published:	2023
Subjects:	Cosmology and Nongalactic Astrophysics High Energy Physics - Experiment Nuclear Experiment
Online Access:	Acceder al recurso
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_version_	1866929290139926528
author	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.
author_facet	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.
contents	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 ${\sim}7$ events per kg-day and electron-equivalent energies of ${\sim}80~$eV, whose origin remains unknown.
format	Preprint
id	arxiv_https___arxiv_org_abs_2306_01717
institution	arXiv
publishDate	2023
record_format	arxiv
spellingShingle	Confirmation of the spectral excess in DAMIC at SNOLAB with skipper CCDs 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. Cosmology and Nongalactic Astrophysics High Energy Physics - Experiment Nuclear Experiment 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 ${\sim}7$ events per kg-day and electron-equivalent energies of ${\sim}80~$eV, whose origin remains unknown.
title	Confirmation of the spectral excess in DAMIC at SNOLAB with skipper CCDs
topic	Cosmology and Nongalactic Astrophysics High Energy Physics - Experiment Nuclear Experiment
url	https://arxiv.org/abs/2306.01717