Measurement of the scintillation and ionization response of liquid xenon at MeV energies in the EXO-200 experiment

Anton, G.; Badhrees, I.; Barbeau, P. S.; Beck, D.; Belov, V.; Bhatta, T.; Breidenbach, M.; Brunner, T.; Cao, G. F.; Cen, W. R.; Chambers, C.; Cleveland, B.; Coon, M.; Craycraft, A.; Daniels, T.; Darroch, L.; Daugherty, S. J.; Davis, J.; Delaquis, S.; Der Mesrobian-Kabakian, A.; DeVoe, R.; Dilling, J.; Dolgolenko, A.; Dolinski, M. J.; Echevers, J.; Fairbank, W.; Fairbank, D.; Farine, J.; Feyzbakhsh, S.; Fierlinger, P.; Fudenberg, D.; Gautam, P.; Gornea, R.; Gratta, G.; Hall, C.; Hansen, E. V.; Hoessl, J.; Hufschmidt, P.; Hughes, M.; Iverson, A.; Jamil, A.; Jessiman, C.; Jewell, M. J.; Johnson, A.; Karelin, A.; Kaufman, L. J.; Koffas, T.; Krucken, R.; Kuchenkov, A.; Kumar, K. S.; Lan, Y.; Larson, A.; Lenardo, B. G.; Leonard, D. S.; Li, G. S.; Li, S.; Li, Z.; Licciardi, C.; Lin, Y. H.; MacLellan, R.; McElroy, T.; Michel, T.; Mong, B.; Moore, D. C.; Murray, K.; Neilson, R.; Njoya, O.; Nusair, O.; Odian, A.; Ostrovskiy, I.; Piepke, A.; Pocar, A.; Retiere, F.; Robinson, A. L.; Rowson, P. C.; Runge, J.; Schmidt, S.; Sinclair, D.; Soma, A. K.; Stekhanov, V.; Tarka, M.; Todd, J.; Tolba, T.; Tosi, D.; Totev, T. I.; Veenstra, B.; Veeraraghavan, V.; Vuilleumier, J. -L.; Wagenpfeil, M.; Watkins, J.; Weber, M.; Wen, L. J.; Wichoski, U.; Wrede, G.; Wu, S. X.; Xia, Q.; Yahne, D. R.; Yang, L.; Yen, Y. -R.; Zeldovich, O. Ya.; Ziegle, T.

doi:10.48550/arxiv.1908.04128

Cited by 4 publications

(4 citation statements)

References 56 publications

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“…In the final stages of preparation of this manuscript, Ref. [36] published a measurement of the average xenon work function of W = 11.5 eV, in agreement with a recent measurement from the EXO-200 collaboration [37]. This value is 16% lower than the value of 13.7 eV adopted here and in the nominal NEST model used widely throughout the field over the last decade.…”

Section: Future Worksupporting

confidence: 74%

Measurement of Charge and Light Yields for $^{127}$Xe L-Shell Electron Captures in Liquid Xenon

Temples,

McLaughlin,

Bargemann

et al. 2021

Preprint

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Dark matter searches using dual-phase xenon time-projection chambers (LXe-TPCs) rely on their ability to reject background electron recoils (ERs) while searching for signal-like nuclear recoils (NRs). ER response is typically calibrated using β-decay sources, such as tritium, but these calibrations do not characterize events accompanied by an atomic vacancy, as in solar neutrino scatters off inner shell electrons. Such events lead to emission of X-rays and Auger electrons, resulting in higher electron-ion recombination and thus a more NR-like response than inferred from β-decay calibration. We present a cross-calibration of tritium β-decays and 127 Xe electron-capture decays (which produce inner-shell vacancies) in a small-scale LXe-TPC and give the most precise measurements to date of light and charge yields for the 127 Xe L-shell electron-capture in liquid xenon. We observe a 6.9σ (9.2σ) discrepancy in the L-shell capture response relative to tritium β-decays, measured at a drift field of 363 ± 14 V/cm (258 ± 13 V/cm), when compared to simulations tuned to reproduce the correct β-decay response. In dark matter searches, use of a background model that neglects this effect leads to overcoverage (higher limits) for background-only multi-kiloton-year exposures, but at a level much less than the 1-σ experiment-to-experiment variation of the 90% C.L. upper limit on the interaction rate of a 50 GeV/c 2 dark matter particle.I.

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Section: Future Worksupporting

confidence: 74%

Measurement of Charge and Light Yields for $^{127}$Xe L-Shell Electron Captures in Liquid Xenon

Temples,

McLaughlin,

Bargemann

et al. 2021

Preprint

View full text Add to dashboard Cite

show abstract

“…In the final stages of preparation of this manuscript, Ref. [37] published a measurement of the average xenon work function of W = 11.5 eV, in agreement with a recent measurement from the EXO-200 collaboration [38]. This value is 16% lower than the value of 13.7 eV adopted here and in the nominal NEST model, and used widely throughout the field over the last decade.…”

Section: Future Worksupporting

confidence: 70%

Measurement of charge and light yields for Xe127 L -shell electron captures in liquid xenon

et al. 2021

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“…1. At sub-keV energy, light yield goes to 0, as in opposite fashion charge asymptotes to its maximum possible value, with NEST uncertainty spanning the possibilities ranging from taking the inverse of the "traditional" W value of 13.7 ± 0.2 eV [12] (73 quanta/keV) to the reciprocal of the recent measurement from EXO, 11.5 ± 0.5 eV (that is, 87 quanta/keV) [18]. However, in the region of greatest interest for our analysis, indicated by vertical dashes in Fig.…”

Section: Noble Element Simulation Techniquementioning

confidence: 99%

Investigating the XENON1T Low-Energy Electronic Recoil Excess Using NEST

Szydagis,

Levy,

Blockinger

et al. 2020

Preprint

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The search for dark matter, the missing mass of the universe, is one of the most active fields of study within particle physics. The XENON1T experiment recently observed a 3.5σ excess potentially consistent with dark matter, or with solar axions. Here, we utilize the Noble Element Simulation Technique (NEST) software to simulate the XENON1T detector, reproducing the excess. We present different detector efficiency and energy reconstruction models, but they primarily impact sub-keV energies and cannot explain the XENON1T excess. However, using NEST, we can reproduce their excess in multiple, unique ways, most easily via the addition of 31 ± 11 37 Ar decays. Furthermore, this results in new, modified background models, reducing the significance of the excess to only 1.5-2σ, at least with non-PLR methods. This is independent confirmation the excess is a real effect, but potentially explicable by known physics. Many cross-checks of our 37 Ar hypothesis are presented.

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Measurement of the scintillation and ionization response of liquid xenon at MeV energies in the EXO-200 experiment

Cited by 4 publications

References 56 publications

Measurement of Charge and Light Yields for $^{127}$Xe L-Shell Electron Captures in Liquid Xenon

Measurement of Charge and Light Yields for $^{127}$Xe L-Shell Electron Captures in Liquid Xenon

Measurement of charge and light yields for Xe127 L -shell electron captures in liquid xenon

Investigating the XENON1T Low-Energy Electronic Recoil Excess Using NEST

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