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Title: Radiopurity assessment of the energy readout for the NEXT double beta decay experiment

In this study, the "Neutrino Experiment with a Xenon Time-Projection Chamber" (NEXT) experiment intends to investigate the neutrinoless double beta decay of 136Xe, and therefore requires a severe suppression of potential backgrounds. An extensive material screening and selection process was undertaken to quantify the radioactivity of the materials used in the experiment. Separate energy and tracking readout planes using different sensors allow us to combine the measurement of the topological signature of the event for background discrimination with the energy resolution optimization. The design of radiopure readout planes, in direct contact with the gas detector medium, was especially challenging since the required components typically have activities too large for experiments demanding ultra-low background conditions. After studying the tracking plane, here the radiopurity control of the energy plane is presented, mainly based on gamma-ray spectroscopy using ultra-low background germanium detectors at the Laboratorio Subterr'aneo de Canfranc (Spain). All the available units of the selected model of photomultiplier have been screened together with most of the components for the bases, enclosures and windows. According to these results for the activity of the relevant radioisotopes, the selected components of the energy plane would give a contribution to the overall background level in themore » region of interest of at most 2.4×10 –4 counts keV –1 kg –1 y –1, satisfying the sensitivity requirements of the NEXT experiment.« less
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Publication Date:
Report Number(s):
FERMILAB-PUB-17-214-CD-ND; arXiv:1706.06012
Journal ID: ISSN 1748-0221; 1605751
Grant/Contract Number:
AC02-07CH11359
Type:
Accepted Manuscript
Journal Name:
Journal of Instrumentation
Additional Journal Information:
Journal Volume: 12; Journal Issue: 08; Journal ID: ISSN 1748-0221
Publisher:
Institute of Physics (IOP)
Research Org:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
Contributing Orgs:
NEXT Collaboration
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; 46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; Double beta decay; Time-Projection Chamber (TPC); Gamma detectors (HPGe); Search for radioactive material
OSTI Identifier:
1459592

Cebrián, S., Pérez, J., Bandac, I., Labarga, L., Álvarez, V., Azevedo, C. D. R., Benlloch-Rodríguez, J. M., Borges, F. I. G. M., Botas, A., Cárcel, S., Carrión, J. V., Conde, C. A. N., Díaz, J., Diesburg, M., Escada, J., Esteve, R., Felkai, R., Fernandes, L. M. P., Ferrario, P., Ferreira, A. L., Freitas, E. D. C., Goldschmidt, A., Gómez-Cadenas, J. J., González-Díaz, D., Gutiérrez, R. M., Hauptman, J., Henriques, C. A. O., Hernandez, A. I., Morata, J. A. Hernando, Herrero, V., Jones, B. J. P., Laing, A., Lebrun, P., Liubarsky, I., López-March, N., Losada, M., Martín-Albo, J., Martínez-Lema, G., Martínez, A., McDonald, A. D., Monrabal, F., Monteiro, C. M. B., Mora, F. J., Moutinho, L. M., Vidal, J. Muñoz, Musti, M., Nebot-Guinot, M., Novella, P., Nygren, D. R., Palmeiro, B., Para, A., Querol, M., Renner, J., Ripoll, L., Rodríguez, J., Rogers, L., Santos, F. P., Santos, J. M. F. dos, Simón, A., Sofka, C., Sorel, M., Stiegler, T., Toledo, J. F., Torrent, J., Tsamalaidze, Z., Veloso, J. F. C. A., Villar, J. A., Webb, R., White, J. T., and Yahlali, N.. Radiopurity assessment of the energy readout for the NEXT double beta decay experiment. United States: N. p., Web. doi:10.1088/1748-0221/12/08/T08003.
Cebrián, S., Pérez, J., Bandac, I., Labarga, L., Álvarez, V., Azevedo, C. D. R., Benlloch-Rodríguez, J. M., Borges, F. I. G. M., Botas, A., Cárcel, S., Carrión, J. V., Conde, C. A. N., Díaz, J., Diesburg, M., Escada, J., Esteve, R., Felkai, R., Fernandes, L. M. P., Ferrario, P., Ferreira, A. L., Freitas, E. D. C., Goldschmidt, A., Gómez-Cadenas, J. J., González-Díaz, D., Gutiérrez, R. M., Hauptman, J., Henriques, C. A. O., Hernandez, A. I., Morata, J. A. Hernando, Herrero, V., Jones, B. J. P., Laing, A., Lebrun, P., Liubarsky, I., López-March, N., Losada, M., Martín-Albo, J., Martínez-Lema, G., Martínez, A., McDonald, A. D., Monrabal, F., Monteiro, C. M. B., Mora, F. J., Moutinho, L. M., Vidal, J. Muñoz, Musti, M., Nebot-Guinot, M., Novella, P., Nygren, D. R., Palmeiro, B., Para, A., Querol, M., Renner, J., Ripoll, L., Rodríguez, J., Rogers, L., Santos, F. P., Santos, J. M. F. dos, Simón, A., Sofka, C., Sorel, M., Stiegler, T., Toledo, J. F., Torrent, J., Tsamalaidze, Z., Veloso, J. F. C. A., Villar, J. A., Webb, R., White, J. T., & Yahlali, N.. Radiopurity assessment of the energy readout for the NEXT double beta decay experiment. United States. doi:10.1088/1748-0221/12/08/T08003.
Cebrián, S., Pérez, J., Bandac, I., Labarga, L., Álvarez, V., Azevedo, C. D. R., Benlloch-Rodríguez, J. M., Borges, F. I. G. M., Botas, A., Cárcel, S., Carrión, J. V., Conde, C. A. N., Díaz, J., Diesburg, M., Escada, J., Esteve, R., Felkai, R., Fernandes, L. M. P., Ferrario, P., Ferreira, A. L., Freitas, E. D. C., Goldschmidt, A., Gómez-Cadenas, J. J., González-Díaz, D., Gutiérrez, R. M., Hauptman, J., Henriques, C. A. O., Hernandez, A. I., Morata, J. A. Hernando, Herrero, V., Jones, B. J. P., Laing, A., Lebrun, P., Liubarsky, I., López-March, N., Losada, M., Martín-Albo, J., Martínez-Lema, G., Martínez, A., McDonald, A. D., Monrabal, F., Monteiro, C. M. B., Mora, F. J., Moutinho, L. M., Vidal, J. Muñoz, Musti, M., Nebot-Guinot, M., Novella, P., Nygren, D. R., Palmeiro, B., Para, A., Querol, M., Renner, J., Ripoll, L., Rodríguez, J., Rogers, L., Santos, F. P., Santos, J. M. F. dos, Simón, A., Sofka, C., Sorel, M., Stiegler, T., Toledo, J. F., Torrent, J., Tsamalaidze, Z., Veloso, J. F. C. A., Villar, J. A., Webb, R., White, J. T., and Yahlali, N.. 2017. "Radiopurity assessment of the energy readout for the NEXT double beta decay experiment". United States. doi:10.1088/1748-0221/12/08/T08003. https://www.osti.gov/servlets/purl/1459592.
@article{osti_1459592,
title = {Radiopurity assessment of the energy readout for the NEXT double beta decay experiment},
author = {Cebrián, S. and Pérez, J. and Bandac, I. and Labarga, L. and Álvarez, V. and Azevedo, C. D. R. and Benlloch-Rodríguez, J. M. and Borges, F. I. G. M. and Botas, A. and Cárcel, S. and Carrión, J. V. and Conde, C. A. N. and Díaz, J. and Diesburg, M. and Escada, J. and Esteve, R. and Felkai, R. and Fernandes, L. M. P. and Ferrario, P. and Ferreira, A. L. and Freitas, E. D. C. and Goldschmidt, A. and Gómez-Cadenas, J. J. and González-Díaz, D. and Gutiérrez, R. M. and Hauptman, J. and Henriques, C. A. O. and Hernandez, A. I. and Morata, J. A. Hernando and Herrero, V. and Jones, B. J. P. and Laing, A. and Lebrun, P. and Liubarsky, I. and López-March, N. and Losada, M. and Martín-Albo, J. and Martínez-Lema, G. and Martínez, A. and McDonald, A. D. and Monrabal, F. and Monteiro, C. M. B. and Mora, F. J. and Moutinho, L. M. and Vidal, J. Muñoz and Musti, M. and Nebot-Guinot, M. and Novella, P. and Nygren, D. R. and Palmeiro, B. and Para, A. and Querol, M. and Renner, J. and Ripoll, L. and Rodríguez, J. and Rogers, L. and Santos, F. P. and Santos, J. M. F. dos and Simón, A. and Sofka, C. and Sorel, M. and Stiegler, T. and Toledo, J. F. and Torrent, J. and Tsamalaidze, Z. and Veloso, J. F. C. A. and Villar, J. A. and Webb, R. and White, J. T. and Yahlali, N.},
abstractNote = {In this study, the "Neutrino Experiment with a Xenon Time-Projection Chamber" (NEXT) experiment intends to investigate the neutrinoless double beta decay of 136Xe, and therefore requires a severe suppression of potential backgrounds. An extensive material screening and selection process was undertaken to quantify the radioactivity of the materials used in the experiment. Separate energy and tracking readout planes using different sensors allow us to combine the measurement of the topological signature of the event for background discrimination with the energy resolution optimization. The design of radiopure readout planes, in direct contact with the gas detector medium, was especially challenging since the required components typically have activities too large for experiments demanding ultra-low background conditions. After studying the tracking plane, here the radiopurity control of the energy plane is presented, mainly based on gamma-ray spectroscopy using ultra-low background germanium detectors at the Laboratorio Subterr'aneo de Canfranc (Spain). All the available units of the selected model of photomultiplier have been screened together with most of the components for the bases, enclosures and windows. According to these results for the activity of the relevant radioisotopes, the selected components of the energy plane would give a contribution to the overall background level in the region of interest of at most 2.4×10–4 counts keV–1 kg–1 y–1, satisfying the sensitivity requirements of the NEXT experiment.},
doi = {10.1088/1748-0221/12/08/T08003},
journal = {Journal of Instrumentation},
number = 08,
volume = 12,
place = {United States},
year = {2017},
month = {8}
}