Erratum: Scintillation time dependence and pulse shape discrimination in liquid argon [Phys. Rev. C<b>78</b>, 035801 (2008)]

The DEAP-1 low-background liquid argon detector was used to measure scintillation pulse shapes of electron and nuclear recoil events and to demonstrate the feasibility of pulse-shape discrimination down to an electron-equivalent energy of 20 keV ee .In the surface dataset using a triple-coincidence tag we found the fraction of β events that are misidentified as nuclear recoils to be < 1.4 × 10 −7 (90% C.L.) for energies between 43-86 keV ee and for a nuclear recoil acceptance of at least 90%, with 4% systematic uncertainty on the absolute energy scale. The discrimination measurement on surface was limited by nuclear recoils induced by cosmic-ray generated neutrons. This was improved by moving the detector to the SNOLAB underground laboratory, where the reduced background rate allowed the same measurement to be done with only a double-coincidence tag.The combined data set contains 1.23 × 10 8 events. One of those, in the underground data set, is in the nuclearrecoil region of interest. Taking into account the expected background of 0.48 events coming from random pileup, the resulting upper limit on the level of electronic recoil contamination is < 2.7 × 10 −8 (90% C.L.) between 44-89 keV ee and for a nuclear recoil acceptance of at least 90%, with 6% systematic uncertainty on the absolute energy scale.We developed a general mathematical framework to describe pulse-shape-discrimination parameter distributions and used it to build an analytical model of the distributions observed in DEAP-1. Using this model, we project a misidentification fraction of approximately 10 −10 for an electron-equivalent energy threshold of 15 keV ee for a detector with 8 PE/keV ee light yield. This reduction enables a 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 , assuming negligible contribution from nuclear recoil backgrounds.

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“…µs and 1.38±0.06 (syst.) µs in the surface and the V1720 underground datasets, respectively, consistent with other reported values [12,18,19].…”

Section: Detector Stabilitysupporting

confidence: 91%

“…Measurements of the pulse-shape discrimination of β-γ events from nuclear recoils in liquid argon have also been reported in [19] and [4]. In this work the upper limit on the β-γ event misidentification probability is improved by a factor of ∼5, due to higher statistics.…”

Section: Introductionmentioning

confidence: 77%

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

Amaudruz

Batygov

Beltrán

et al. 2016

Astroparticle Physics

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“…been measured for LAr in microCLEAN [59] [68]. The scintillation efficiency for nuclear recoils is essentially flat, independent of energy, for recoil energies above ∼20 keV nr .…”

Section: Uncertainties From Leff Of Liquid Argon Detectormentioning

confidence: 99%

“…19 shows the event rate of CENNS in a one ton liquid argon neutrino detector given a neutrino flux of 5 × 10 5 ν/cm 2 /s when the detector is located 20 m away from the target at a far-off-axis site. Assuming flat ∼50% detection efficiency, which is mostly from the PSD cut efficiency [59,60], we expect about ∼250 CENNS events/ton/year at 25 keV nr energy threshold after background subtraction (at 32 kW beam power). The beaminduced neutron backgrounds and systematic uncertainties are discussed in the following sections.…”

Section: Cenns Experiments a Cenns Detectormentioning

confidence: 99%

A method for measuring coherent elastic neutrino-nucleus scattering at a far off-axis high-energy neutrino beam target

et al. 2014

Self Cite

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We present a new experimental method for measuring the process of Coherent Elastic Neutrino Nucleus Scattering (CENNS). This method uses a detector situated transverse to a high energy neutrino beam production target. This detector would be sensitive to the low energy neutrinos arising from pion decays-at-rest in the target. We discuss the physics motivation for making this measurement and outline the predicted backgrounds and sensitivities using this approach. We report a measurement of neutron backgrounds as found in an off-axis surface location of the Fermilab Booster Neutrino Beam (BNB) target. The results indicate that the Fermilab BNB target is a favorable location for a CENNS experiment.

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“…It is very efficient discriminating nuclear recoils from electron recoils with pulse shape discrimination, hybrid measurements and so on. The rejection powers of these techniques can even reach 10 6 [10,11]. For example, the CDMS-II [10] and EDELWEISS-II [12] experiments measure both ionization and heat signatures using cryogenic germanium detectors in order to discriminate between nuclear and electron recoils, and the XENON100 [13] and ZEPLIN-III [14] experiments measure both ionization and scintillation signatures using two-phase xenon detectors.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the neutron background in CsI target for WIMP direct detection when using a reactor neutrino detector as a neutron veto system

et al. 2014

Eur. Phys. J. C

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A direct Weakly Interacting Massive Particle (WIMP) detector with a neutron veto system is designed to better reject neutrons. An experimental configuration is studied in the present paper: a WIMP detectors with CsI(Na) target is placed inside a reactor neutrino detector. The neutrino detector is used as a neutron veto device. The neutron background for the experimental design has been estimated using the Geant4 simulation. The results show that the neutron background can decrease to O(0.01) events per year per tonne of CsI(Na). We calculate the sensitivity to spin-independent WIMP-nucleon elastic scattering. An exposure of 1 tonne × year could reach a cross-section of about 3× 10 −11 pb.

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Erratum: Scintillation time dependence and pulse shape discrimination in liquid argon [Phys. Rev. C78, 035801 (2008)]

Cited by 63 publications

References 0 publications

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

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

A method for measuring coherent elastic neutrino-nucleus scattering at a far off-axis high-energy neutrino beam target

Evaluation of the neutron background in CsI target for WIMP direct detection when using a reactor neutrino detector as a neutron veto system

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