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Title: Measurement of the scintillation time spectra and pulse-shape discrimination of low-energy β and nuclear recoils in liquid argon with DEAP-1

The DEAP-1 low-background liquid argon detector has been used to measure scintillation pulse shapes of beta decays and nuclear recoil events and to demonstrate the feasibility of pulse-shape discrimination down to an electron-equivalent energy of 20 keV ee. The relative intensities of singlet/triplet states in liquid argon have been measured as a function of energy between 15 and 500 keVee for both beta and nuclear recoils. Using a triple-coincidence tag we find the fraction of beta events that are misidentified as nuclear recoils to be less than 6 x 10 -8 between 43-86 keV ee and that the discrimination parameter agrees with a simple analytic model. The discrimination measurement is currently limited by nuclear recoils induced by cosmic-ray generated neutrons, and is expected to improve by operating the detector underground at SNOLAB. The analytic model predicts a beta misidentification fraction of 10 -10 for an electron-equivalent energy threshold of 20 keV ee. This reduction allows for a sensitive search for spin-independent scattering of WIMPs from 1000 kg of liquid argon with a WIMP-nucleon cross-section sensitivity of 10 -46 cm 2.
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Publication Date:
Report Number(s):
FERMILAB-PUB-16-697-AE; arXiv:0904.2930
Journal ID: ISSN 0927-6505; 818299
Grant/Contract Number:
AC02-07CH11359
Type:
Accepted Manuscript
Journal Name:
Astroparticle Physics
Additional Journal Information:
Journal Volume: 85; Journal Issue: C; Journal ID: ISSN 0927-6505
Publisher:
Elsevier
Research Org:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25); National Science and Engineering Research Council of Canada (NSERC); Canada Foundation for Innovation (CFI); Ontario Ministry of Research and Innovation (MRI); David and Lucille Packard Foundation
Contributing Orgs:
DEAP Collaboration
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; 46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
OSTI Identifier:
1368371

Amaudruz, P. -A., Batygov, M., Beltran, B., Bonatt, J., Boudjemline, K., Boulay, M. G., Broerman, B., Bueno, J. F., Butcher, A., Cai, B., Caldwell, T., Chen, M., Chouinard, R., Cleveland, B. T., Cranshaw, D., Dering, K., Duncan, F., Fatemighomi, N., Ford, R., Gagnon, R., Giampa, P., Giuliani, F., Gold, M., Golovko, V. V., Gorel, P., Grace, E., Graham, K., Grant, D. R., Hakobyan, R., Hallin, A. L., Hamstra, M., Harvey, P., Hearns, C., Hofgartner, J., Jillings, C. J., Kuźniak, M., Lawson, I., La Zia, F., Li, O., Lidgard, J. J., Liimatainen, P., Lippincott, W. H., Mathew, R., McDonald, A. B., McElroy, T., McFarlane, K., McKinsey, D. N., Mehdiyev, R., Monroe, J., Muir, A., Nantais, C., Nicolics, K., Nikkel, J., Noble, A. J., O’Dwyer, E., Olsen, K., Ouellet, C., Pasuthip, P., Peeters, S. J. M., Pollmann, T., Rau, W., Retière, F., Ronquest, M., Seeburn, N., Skensved, P., Smith, B., Sonley, T., Tang, J., Vázquez-Jáuregui, E., Veloce, L., Walding, J., and Ward, M.. Measurement of the scintillation time spectra and pulse-shape discrimination of low-energy β and nuclear recoils in liquid argon with DEAP-1. United States: N. p., Web. doi:10.1016/j.astropartphys.2016.09.002.
Amaudruz, P. -A., Batygov, M., Beltran, B., Bonatt, J., Boudjemline, K., Boulay, M. G., Broerman, B., Bueno, J. F., Butcher, A., Cai, B., Caldwell, T., Chen, M., Chouinard, R., Cleveland, B. T., Cranshaw, D., Dering, K., Duncan, F., Fatemighomi, N., Ford, R., Gagnon, R., Giampa, P., Giuliani, F., Gold, M., Golovko, V. V., Gorel, P., Grace, E., Graham, K., Grant, D. R., Hakobyan, R., Hallin, A. L., Hamstra, M., Harvey, P., Hearns, C., Hofgartner, J., Jillings, C. J., Kuźniak, M., Lawson, I., La Zia, F., Li, O., Lidgard, J. J., Liimatainen, P., Lippincott, W. H., Mathew, R., McDonald, A. B., McElroy, T., McFarlane, K., McKinsey, D. N., Mehdiyev, R., Monroe, J., Muir, A., Nantais, C., Nicolics, K., Nikkel, J., Noble, A. J., O’Dwyer, E., Olsen, K., Ouellet, C., Pasuthip, P., Peeters, S. J. M., Pollmann, T., Rau, W., Retière, F., Ronquest, M., Seeburn, N., Skensved, P., Smith, B., Sonley, T., Tang, J., Vázquez-Jáuregui, E., Veloce, L., Walding, J., & Ward, M.. Measurement of the scintillation time spectra and pulse-shape discrimination of low-energy β and nuclear recoils in liquid argon with DEAP-1. United States. doi:10.1016/j.astropartphys.2016.09.002.
Amaudruz, P. -A., Batygov, M., Beltran, B., Bonatt, J., Boudjemline, K., Boulay, M. G., Broerman, B., Bueno, J. F., Butcher, A., Cai, B., Caldwell, T., Chen, M., Chouinard, R., Cleveland, B. T., Cranshaw, D., Dering, K., Duncan, F., Fatemighomi, N., Ford, R., Gagnon, R., Giampa, P., Giuliani, F., Gold, M., Golovko, V. V., Gorel, P., Grace, E., Graham, K., Grant, D. R., Hakobyan, R., Hallin, A. L., Hamstra, M., Harvey, P., Hearns, C., Hofgartner, J., Jillings, C. J., Kuźniak, M., Lawson, I., La Zia, F., Li, O., Lidgard, J. J., Liimatainen, P., Lippincott, W. H., Mathew, R., McDonald, A. B., McElroy, T., McFarlane, K., McKinsey, D. N., Mehdiyev, R., Monroe, J., Muir, A., Nantais, C., Nicolics, K., Nikkel, J., Noble, A. J., O’Dwyer, E., Olsen, K., Ouellet, C., Pasuthip, P., Peeters, S. J. M., Pollmann, T., Rau, W., Retière, F., Ronquest, M., Seeburn, N., Skensved, P., Smith, B., Sonley, T., Tang, J., Vázquez-Jáuregui, E., Veloce, L., Walding, J., and Ward, M.. 2016. "Measurement of the scintillation time spectra and pulse-shape discrimination of low-energy β and nuclear recoils in liquid argon with DEAP-1". United States. doi:10.1016/j.astropartphys.2016.09.002. https://www.osti.gov/servlets/purl/1368371.
@article{osti_1368371,
title = {Measurement of the scintillation time spectra and pulse-shape discrimination of low-energy β and nuclear recoils in liquid argon with DEAP-1},
author = {Amaudruz, P. -A. and Batygov, M. and Beltran, B. and Bonatt, J. and Boudjemline, K. and Boulay, M. G. and Broerman, B. and Bueno, J. F. and Butcher, A. and Cai, B. and Caldwell, T. and Chen, M. and Chouinard, R. and Cleveland, B. T. and Cranshaw, D. and Dering, K. and Duncan, F. and Fatemighomi, N. and Ford, R. and Gagnon, R. and Giampa, P. and Giuliani, F. and Gold, M. and Golovko, V. V. and Gorel, P. and Grace, E. and Graham, K. and Grant, D. R. and Hakobyan, R. and Hallin, A. L. and Hamstra, M. and Harvey, P. and Hearns, C. and Hofgartner, J. and Jillings, C. J. and Kuźniak, M. and Lawson, I. and La Zia, F. and Li, O. and Lidgard, J. J. and Liimatainen, P. and Lippincott, W. H. and Mathew, R. and McDonald, A. B. and McElroy, T. and McFarlane, K. and McKinsey, D. N. and Mehdiyev, R. and Monroe, J. and Muir, A. and Nantais, C. and Nicolics, K. and Nikkel, J. and Noble, A. J. and O’Dwyer, E. and Olsen, K. and Ouellet, C. and Pasuthip, P. and Peeters, S. J. M. and Pollmann, T. and Rau, W. and Retière, F. and Ronquest, M. and Seeburn, N. and Skensved, P. and Smith, B. and Sonley, T. and Tang, J. and Vázquez-Jáuregui, E. and Veloce, L. and Walding, J. and Ward, M.},
abstractNote = {The DEAP-1 low-background liquid argon detector has been used to measure scintillation pulse shapes of beta decays and nuclear recoil events and to demonstrate the feasibility of pulse-shape discrimination down to an electron-equivalent energy of 20 keVee. The relative intensities of singlet/triplet states in liquid argon have been measured as a function of energy between 15 and 500 keVee for both beta and nuclear recoils. Using a triple-coincidence tag we find the fraction of beta events that are misidentified as nuclear recoils to be less than 6 x 10-8 between 43-86 keVee and that the discrimination parameter agrees with a simple analytic model. The discrimination measurement is currently limited by nuclear recoils induced by cosmic-ray generated neutrons, and is expected to improve by operating the detector underground at SNOLAB. The analytic model predicts a beta misidentification fraction of 10-10 for an electron-equivalent energy threshold of 20 keVee. This reduction allows for a sensitive search for spin-independent scattering of WIMPs from 1000 kg of liquid argon with a WIMP-nucleon cross-section sensitivity of 10-46 cm2.},
doi = {10.1016/j.astropartphys.2016.09.002},
journal = {Astroparticle Physics},
number = C,
volume = 85,
place = {United States},
year = {2016},
month = {9}
}