Modeling pulse characteristics in Xenon with NEST

Möck, J.; Barry, N.; Kazkaz, K.; Stolp, D.; Szydagis, M.; Tripathi, M.; Uvarov, S.; Woods, M.; Walsh, N.

doi:10.1088/1748-0221/9/04/t04002

Cited by 38 publications

(57 citation statements)

References 36 publications

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“…For the 50 to 600 V=cm field variation over the fiducial region relevant to this analysis, the average light yield for a 5 keV ER event falls by 15%, while average charge yield rises by the same amount. The scale of variation is less pronounced for lowerenergy ER events [32,33]. For a 5 keV NR event, the fieldinduced changes in light and charge yield are smaller, at the level of 5% [34].…”

Section: ∼10mentioning

confidence: 93%

“…1) with that predicted by the response model, in the range of 0-50 phd, which roughly corresponds to an energy range of 0-10 keVee. Specific to each exposure segment, two model parameters are varied during these fits: the electric field magnitude, and the recombination fluctuation parameter F r (see [32,34,35,41]). Parameters that describe the detector as a whole (e.g., g 1 , electron extraction efficiency, and S2 gas gain), are allowed to vary while constrained to be equal for all exposure segments within a given date bin.…”

Section: Prl 118 021303 (2017) P H Y S I C a L R E V I E W L E T T Ementioning

confidence: 99%

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Dark Matter Still at Large

Cooley

2017

Physics

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We report constraints on spin-independent weakly interacting massive particle (WIMP)-nucleon scattering using a 3.35 × 10 4 kg day exposure of the Large Underground Xenon (LUX) experiment. A dual-phase xenon time projection chamber with 250 kg of active mass is operated at the Sanford Underground Research Facility under Lead, South Dakota (USA). With roughly fourfold improvement in sensitivity for high WIMP masses relative to our previous results, this search yields no evidence of WIMP nuclear recoils. At a WIMP mass of 50 GeV c −2 , WIMP-nucleon spin-independent cross sections above 2.2 × 10 −46 cm 2 are excluded at the 90% confidence level. When combined with the previously reported LUX exposure, this exclusion strengthens to 1.1 × 10 −46 cm 2 at 50 GeV c −2 .

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Section: ∼10mentioning

confidence: 93%

Section: Prl 118 021303 (2017) P H Y S I C a L R E V I E W L E T T Ementioning

confidence: 99%

Dark Matter Still at Large

Cooley

2017

Physics

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“…[46]), the electron drift speeds in liquid and gas, the electron extraction delay at the liquid surface, the (small) light travel time to the PMTs, and the singlet and triplet time constants characteristic of the excited molecular (excimer) states of xenon dimers. The last two contributions, plus the time it takes for ionization electrons to recombine with ions, also allows reproduction of the S1 pulse shape [47,48].…”

Section: Simulations: Luxsim a Infrastructurementioning

confidence: 99%

Calibration, event reconstruction, data analysis, and limit calculation for the LUX dark matter experiment

Akerib¹,

Alsum²,

Araújo³

et al. 2018

Phys. Rev. D

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The LUX experiment has performed searches for dark-matter particles scattering elastically on xenon nuclei, leading to stringent upper limits on the nuclear scattering cross sections for dark matter. Here, for results derived from 1.4 × 10 4 kg days of target exposure in 2013, details of the calibration, event-reconstruction, modeling, and statistical tests that underlie the results are presented. Detector performance is characterized, including measured efficiencies, stability of response, position resolution, and discrimination between electron-and nuclear-recoil populations. Models are developed for the drift field, optical properties, background populations, the electron-and nuclear-recoil responses, and the absolute rate of low-energy background events. Innovations in the analysis include in situ measurement of the photomultipliers' response to xenon scintillation photons, verification of fiducial mass with a low-energy internal calibration source, and new empirical models for low-energy signal yield based on large-sample, in situ calibrations.

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“…V D. The ratio of excitons to ions is constant for ER interactions, n ex /n i = 0.2 [10,15,16]. Each exciton de-excites, emitting a 178-nm photon [17][18][19]. A fraction of the initial electron-ion pairs, r, recombine and form additional excitons.…”

Section: Energy Reconstruction and Signal Yieldsmentioning

confidence: 99%

Signal yields, energy resolution, and recombination fluctuations in liquid xenon

Akerib¹,

Alsum²,

Araújo³

et al. 2017

Phys. Rev. D

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This work presents an analysis of monoenergetic electronic recoil peaks in the dark-matter-search and calibration data from the first underground science run of the Large Underground Xenon (LUX) detector. Liquid xenon charge and light yields for electronic recoil energies between 5.2 and 661.7 keV are measured, as well as the energy resolution for the LUX detector at those same energies. Additionally, there is an interpretation of existing measurements and descriptions of electron-ion recombination fluctuations in liquid xenon as limiting cases of a more general liquid xenon recombination fluctuation model. Measurements of the standard deviation of these fluctuations at monoenergetic electronic recoil peaks exhibit a linear dependence on the number of ions for energy deposits up to 661.7 keV, consistent with previous LUX measurements between 2 and 16 keV with 3H. We highlight similarities in liquid xenon recombination for electronic and nuclear recoils with a comparison of recombination fluctuations measured with low-energy calibration data

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Modeling pulse characteristics in Xenon with NEST

Cited by 38 publications

References 36 publications

Dark Matter Still at Large

Dark Matter Still at Large

Calibration, event reconstruction, data analysis, and limit calculation for the LUX dark matter experiment

Signal yields, energy resolution, and recombination fluctuations in liquid xenon

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