Scintillation efficiency of liquid argon in low energy neutron-argon scattering

Creus, W.; Allkofer, Y.; Amsler, C.; Ferella, A. D.; Rochet, J.; Scotto-Lavina, L.; Walter, Michael

doi:10.1088/1748-0221/10/08/p08002

Cited by 18 publications

(31 citation statements)

References 35 publications

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“…The quenching model in PARIS acts by scaling E dep , and hence reducing the number of quanta, in Equations 5.4 and 5.5. The tension between the published results of nuclear recoil quenching in LAr, especially at low energies [38], suggests implementing the two most used models, the Lindhard [39] and Mei [40] Statistical fluctuations of S1 and S2 are introduced in PARIS only at the photon emission level. In particular, it is assumed that each exciton and each recombined pair can induce exactly one photon.…”

Section: The Paris Model For Scintillation and Ionization In Liquid Amentioning

confidence: 99%

“…The quenching factor in liquid argon (often called L e f f or scintillation efficiency3) was measured by SCENE [47], MicroCLEAN [48], WARP [49], and W. Creus et al [50]. The four measurements agree within 2 σ with a value of approximately 0.28 at energies above 50 keV.…”

Section: The Quenching Of Nuclear Recoilsmentioning

confidence: 99%

“…Comparison of the Lindhard and Mei models with the G4DS best fit of the DarkSide-50 data. SCENE [47], MicroCLEAN [48], WARP [49], and W. Creus et al [50] data sets are also shown.…”

Section: The Quenching Of Nuclear Recoilsmentioning

confidence: 99%

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Simulation of argon response and light detection in the DarkSide-50 dual phase TPC

Agnes¹,

Albuquerque²,

Alexander³

et al. 2017

J. Inst.

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A: A Geant4-based Monte Carlo package named G4DS has been developed to simulate the response of DarkSide-50, an experiment operating since 2013 at LNGS, designed to detect WIMP interactions in liquid argon. In the process of WIMP searches, DarkSide-50 has achieved two fundamental milestones: the rejection of electron recoil background with a power of ∼10 7 , using the pulse shape discrimination technique, and the measurement of the residual 39 Ar contamination in underground argon, ∼3 orders of magnitude lower with respect to atmospheric argon. These results rely on the accurate simulation of the detector response to the liquid argon scintillation, its ionization, and electron-ion recombination processes. This work provides a complete overview of the DarkSide Monte Carlo and of its performance, with a particular focus on PARIS, the custommade liquid argon response model.

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Section: The Paris Model For Scintillation and Ionization In Liquid Amentioning

confidence: 99%

Section: The Quenching Of Nuclear Recoilsmentioning

confidence: 99%

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Simulation of argon response and light detection in the DarkSide-50 dual phase TPC

Agnes¹,

Albuquerque²,

Alexander³

et al. 2017

J. Inst.

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“…The W-value is about 20-30 eV for noble gases and hydrocarbons (see Table 3 for those used in the simulation), while the Fano factor lies between 0.15–0.2, i.e., the distribution of is not Poissonian. For computational reasons, we have combined the primary charge fluctuations with the amplification ones in a later step. Quenching factor For the specific case of nuclear recoils, we have considered the conservative parametrization [70] given by where is the event energy expressed in keVee and the function is parametrized in terms of the atom number ( Z ) and mass ( A ) as This parametrization is more conservative than the Lindhard model for k 0.157 [71] and the value of 0.3 measured for scintillation light in liquid argon in [72] at 1 keVnr. Diffusion effects Each primary electron is projected to the XY plane and the time line following two gaussian distributions, whose widths are calculated by the distance to the readouts and the gas parameters (drift velocity, longitudinal and transversal diffusion coefficients) generated by Magboltz [73]. The gas parameters are detailed in Table 3.…”

Section: Background Model Of Trex-dm At Lscmentioning

confidence: 99%

TREX-DM: a low-background Micromegas-based TPC for low-mass WIMP detection

et al. 2016

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If Dark Matter is made of Weakly Interacting Massive Particles (WIMPs) with masses below GeV, the corresponding nuclear recoils in mainstream WIMP experiments are of energies too close, or below, the experimental threshold. Gas Time Projection Chambers (TPCs) can be operated with a variety of target elements, offer good tracking capabilities and, on account of the amplification in gas, very low thresholds are achievable. Recent advances in electronics and in novel radiopure TPC readouts, especially micro-mesh gas structure (Micromegas), are improving the scalability and low-background prospects of gaseous TPCs. Here we present TREX-DM, a prototype to test the concept of a Micromegas-based TPC to search for low-mass WIMPs. The detector is designed to host an active mass of kg of Ar at 10 bar, or alternatively kg of Ne at 10 bar, with an energy threshold below 0.4 keVee, and is fully built with radiopure materials. We will describe the detector in detail, the results from the commissioning phase on surface, as well as a preliminary background model. The anticipated sensitivity of this technique may go beyond current experimental limits for WIMPs of masses of 2–8 GeV.

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“…It is 100% anti-correlated noise that randomly moves counts from the late into the prompt region 15 without affecting the sum count.…”

Section: Appendix A42 Adding Window Noisementioning

confidence: 99%

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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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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Scintillation efficiency of liquid argon in low energy neutron-argon scattering

Cited by 18 publications

References 35 publications

Simulation of argon response and light detection in the DarkSide-50 dual phase TPC

Simulation of argon response and light detection in the DarkSide-50 dual phase TPC

TREX-DM: a low-background Micromegas-based TPC for low-mass WIMP detection

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

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