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Title: Radiogenic backgrounds in the NEXT double beta decay experiment

Abstract

Natural radioactivity represents one of the main backgrounds in the search for neutrinoless double beta decay. Within the NEXT physics program, the radioactivity-induced backgrounds are measured with the NEXT-White detector. Data from 37.9 days of low-background operations at the Laboratorio Subterr\'aneo de Canfranc with xenon depleted in $$^{136}$$Xe are analyzed to derive a total background rate of (0.84$$\pm$$0.02) mHz above 1000 keV. The comparison of data samples with and without the use of the radon abatement system demonstrates that the contribution of airborne-Rn is negligible. A radiogenic background model is built upon the extensive radiopurity screening campaign conducted by the NEXT Collaboration. A spectral fit to this model yields the specific contributions of $$^{60}$$Co, $$^{40}$$K, $$^{214}$$Bi and $$^{208}$$Tl to the total background rate, as well as their location in the detector volumes. The results are used to evaluate the impact of the radiogenic backgrounds in the double beta decay analyses, after the application of topological cuts that reduce the total rate to (0.25$$\pm$$0.01) mHz. Based on the best-fit background model, the NEXT-White median sensitivity to the two-neutrino double beta decay is found to be 3.5$$\sigma$$ after 1 year of data taking. The background measurement in a Q$$_{\beta\beta}\pm$$100 keV energy window validates the best-fit background model also for the neutrinoless double beta decay search with NEXT-100. Only one event is found, while the model expectation is (0.75$$\pm$$0.12) events.

Authors:
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Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States); Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
Contributing Org.:
The NEXT collaboration
OSTI Identifier:
1546021
Report Number(s):
arXiv:1905.13625; FERMILAB-PUB-19-261-CD-ND
Journal ID: ISSN 1029-8479; oai:inspirehep.net:1737651
Grant/Contract Number:  
AC02-07CH11359
Resource Type:
Accepted Manuscript
Journal Name:
Journal of High Energy Physics (Online)
Additional Journal Information:
Journal Name: Journal of High Energy Physics (Online); Journal Volume: 2019; Journal Issue: 10; Journal ID: ISSN 1029-8479
Publisher:
Springer Berlin
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; Dark Matter and Double Beta Decay (experiments)

Citation Formats

Novella, P., Palmeiro, B., Sorel, M., Usón, A., Ferrario, P., Gómez-Cadenas, J. J., Adams, C., Álvarez, V., Arazi, L., Arnquist, I. J., Azevedo, C. D. R., Bailey, K., Ballester, F., Benlloch-Rodríguez, J. M., Borges, F. I. G. M., Byrnes, N., Cárcel, S., Carrión, J. V., Cebrían, S., Church, E., Conde, C. A. N., Contreras, T., Díaz, G., Díaz, J., Diesburg, M., Escada, J., Esteve, R., Felkai, R., Fernandes, A. F. M., Fernandes, L. M. P., Ferreira, A. L., Freitas, E. D. C., Generowicz, J., Ghosh, S., Goldschmidt, A., Gonźalez-Díaz, D., Guenette, R., Gutiérrez, R. M., Haefner, J., Hafidi, K., Hauptman, J., Henriques, C. A. O., Hernando Morata, J. A., Herrero, P., Herrero, V., Ifergan, Y., Johnston, S., Jones, B. J. P., Kekic, M., Labarga, L., Laing, A., Lebrun, P., López-March, N., Losada, M., Mano, R. D. P., Martín-Albo, J., Martínez, A., Martínez-Lema, G., McDonald, A. D., Monrabal, F., Monteiro, C. M. B., Mora, F. J., Muñoz Vidal, J., Nygren, D. R., Para, A., Pérez, J., Psihas, F., Querol, M., Renner, J., Repond, J., Riordan, S., Ripoll, L., Rodríguez García, Y., Rodríguez, J., Rogers, L., Romeo, B., Romo-Luque, C., Santos, F. P., dos Santos, J. M. F., Simón, A., Sofka, C., Stiegler, T., Toledo, J. F., Torrent, J., Veloso, J. F. C. A., Webb, R., Weiss-Babai, R., White, J. T., Woodruff, K., and Yahlali, N. Radiogenic backgrounds in the NEXT double beta decay experiment. United States: N. p., 2019. Web. doi:10.1007/JHEP10(2019)051.
Novella, P., Palmeiro, B., Sorel, M., Usón, A., Ferrario, P., Gómez-Cadenas, J. J., Adams, C., Álvarez, V., Arazi, L., Arnquist, I. J., Azevedo, C. D. R., Bailey, K., Ballester, F., Benlloch-Rodríguez, J. M., Borges, F. I. G. M., Byrnes, N., Cárcel, S., Carrión, J. V., Cebrían, S., Church, E., Conde, C. A. N., Contreras, T., Díaz, G., Díaz, J., Diesburg, M., Escada, J., Esteve, R., Felkai, R., Fernandes, A. F. M., Fernandes, L. M. P., Ferreira, A. L., Freitas, E. D. C., Generowicz, J., Ghosh, S., Goldschmidt, A., Gonźalez-Díaz, D., Guenette, R., Gutiérrez, R. M., Haefner, J., Hafidi, K., Hauptman, J., Henriques, C. A. O., Hernando Morata, J. A., Herrero, P., Herrero, V., Ifergan, Y., Johnston, S., Jones, B. J. P., Kekic, M., Labarga, L., Laing, A., Lebrun, P., López-March, N., Losada, M., Mano, R. D. P., Martín-Albo, J., Martínez, A., Martínez-Lema, G., McDonald, A. D., Monrabal, F., Monteiro, C. M. B., Mora, F. J., Muñoz Vidal, J., Nygren, D. R., Para, A., Pérez, J., Psihas, F., Querol, M., Renner, J., Repond, J., Riordan, S., Ripoll, L., Rodríguez García, Y., Rodríguez, J., Rogers, L., Romeo, B., Romo-Luque, C., Santos, F. P., dos Santos, J. M. F., Simón, A., Sofka, C., Stiegler, T., Toledo, J. F., Torrent, J., Veloso, J. F. C. A., Webb, R., Weiss-Babai, R., White, J. T., Woodruff, K., & Yahlali, N. Radiogenic backgrounds in the NEXT double beta decay experiment. United States. doi:10.1007/JHEP10(2019)051.
Novella, P., Palmeiro, B., Sorel, M., Usón, A., Ferrario, P., Gómez-Cadenas, J. J., Adams, C., Álvarez, V., Arazi, L., Arnquist, I. J., Azevedo, C. D. R., Bailey, K., Ballester, F., Benlloch-Rodríguez, J. M., Borges, F. I. G. M., Byrnes, N., Cárcel, S., Carrión, J. V., Cebrían, S., Church, E., Conde, C. A. N., Contreras, T., Díaz, G., Díaz, J., Diesburg, M., Escada, J., Esteve, R., Felkai, R., Fernandes, A. F. M., Fernandes, L. M. P., Ferreira, A. L., Freitas, E. D. C., Generowicz, J., Ghosh, S., Goldschmidt, A., Gonźalez-Díaz, D., Guenette, R., Gutiérrez, R. M., Haefner, J., Hafidi, K., Hauptman, J., Henriques, C. A. O., Hernando Morata, J. A., Herrero, P., Herrero, V., Ifergan, Y., Johnston, S., Jones, B. J. P., Kekic, M., Labarga, L., Laing, A., Lebrun, P., López-March, N., Losada, M., Mano, R. D. P., Martín-Albo, J., Martínez, A., Martínez-Lema, G., McDonald, A. D., Monrabal, F., Monteiro, C. M. B., Mora, F. J., Muñoz Vidal, J., Nygren, D. R., Para, A., Pérez, J., Psihas, F., Querol, M., Renner, J., Repond, J., Riordan, S., Ripoll, L., Rodríguez García, Y., Rodríguez, J., Rogers, L., Romeo, B., Romo-Luque, C., Santos, F. P., dos Santos, J. M. F., Simón, A., Sofka, C., Stiegler, T., Toledo, J. F., Torrent, J., Veloso, J. F. C. A., Webb, R., Weiss-Babai, R., White, J. T., Woodruff, K., and Yahlali, N. Fri . "Radiogenic backgrounds in the NEXT double beta decay experiment". United States. doi:10.1007/JHEP10(2019)051. https://www.osti.gov/servlets/purl/1546021.
@article{osti_1546021,
title = {Radiogenic backgrounds in the NEXT double beta decay experiment},
author = {Novella, P. and Palmeiro, B. and Sorel, M. and Usón, A. and Ferrario, P. and Gómez-Cadenas, J. J. and Adams, C. and Álvarez, V. and Arazi, L. and Arnquist, I. J. and Azevedo, C. D. R. and Bailey, K. and Ballester, F. and Benlloch-Rodríguez, J. M. and Borges, F. I. G. M. and Byrnes, N. and Cárcel, S. and Carrión, J. V. and Cebrían, S. and Church, E. and Conde, C. A. N. and Contreras, T. and Díaz, G. and Díaz, J. and Diesburg, M. and Escada, J. and Esteve, R. and Felkai, R. and Fernandes, A. F. M. and Fernandes, L. M. P. and Ferreira, A. L. and Freitas, E. D. C. and Generowicz, J. and Ghosh, S. and Goldschmidt, A. and Gonźalez-Díaz, D. and Guenette, R. and Gutiérrez, R. M. and Haefner, J. and Hafidi, K. and Hauptman, J. and Henriques, C. A. O. and Hernando Morata, J. A. and Herrero, P. and Herrero, V. and Ifergan, Y. and Johnston, S. and Jones, B. J. P. and Kekic, M. and Labarga, L. and Laing, A. and Lebrun, P. and López-March, N. and Losada, M. and Mano, R. D. P. and Martín-Albo, J. and Martínez, A. and Martínez-Lema, G. and McDonald, A. D. and Monrabal, F. and Monteiro, C. M. B. and Mora, F. J. and Muñoz Vidal, J. and Nygren, D. R. and Para, A. and Pérez, J. and Psihas, F. and Querol, M. and Renner, J. and Repond, J. and Riordan, S. and Ripoll, L. and Rodríguez García, Y. and Rodríguez, J. and Rogers, L. and Romeo, B. and Romo-Luque, C. and Santos, F. P. and dos Santos, J. M. F. and Simón, A. and Sofka, C. and Stiegler, T. and Toledo, J. F. and Torrent, J. and Veloso, J. F. C. A. and Webb, R. and Weiss-Babai, R. and White, J. T. and Woodruff, K. and Yahlali, N.},
abstractNote = {Natural radioactivity represents one of the main backgrounds in the search for neutrinoless double beta decay. Within the NEXT physics program, the radioactivity-induced backgrounds are measured with the NEXT-White detector. Data from 37.9 days of low-background operations at the Laboratorio Subterr\'aneo de Canfranc with xenon depleted in $^{136}$Xe are analyzed to derive a total background rate of (0.84$\pm$0.02) mHz above 1000 keV. The comparison of data samples with and without the use of the radon abatement system demonstrates that the contribution of airborne-Rn is negligible. A radiogenic background model is built upon the extensive radiopurity screening campaign conducted by the NEXT Collaboration. A spectral fit to this model yields the specific contributions of $^{60}$Co, $^{40}$K, $^{214}$Bi and $^{208}$Tl to the total background rate, as well as their location in the detector volumes. The results are used to evaluate the impact of the radiogenic backgrounds in the double beta decay analyses, after the application of topological cuts that reduce the total rate to (0.25$\pm$0.01) mHz. Based on the best-fit background model, the NEXT-White median sensitivity to the two-neutrino double beta decay is found to be 3.5$\sigma$ after 1 year of data taking. The background measurement in a Q$_{\beta\beta}\pm$100 keV energy window validates the best-fit background model also for the neutrinoless double beta decay search with NEXT-100. Only one event is found, while the model expectation is (0.75$\pm$0.12) events.},
doi = {10.1007/JHEP10(2019)051},
journal = {Journal of High Energy Physics (Online)},
number = 10,
volume = 2019,
place = {United States},
year = {2019},
month = {10}
}

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