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T P Biesiadzinski - One of the best experts on this subject based on the ideXlab platform.
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calibration event reconstruction data analysis and limit calculation for the lux dark matter experiment
Physical Review D, 2018Co-Authors: D S Akerib, A Bernstein, S Alsum, H M Araujo, X Bai, A J Bailey, J Balajthy, P Beltrame, E P Bernard, T P BiesiadzinskiAbstract: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 1.4×104 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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calibration event reconstruction data analysis and limit calculation for the lux dark matter experiment
Physical Review D, 2018Co-Authors: D S Akerib, A Bernstein, S Alsum, H M Araujo, X Bai, A J Bailey, J Balajthy, P Beltrame, E P Bernard, T P BiesiadzinskiAbstract:Author(s): Akerib, DS; Alsum, S; Araujo, HM; Bai, X; Bailey, AJ; Balajthy, J; Beltrame, P; Bernard, EP; Bernstein, A; Biesiadzinski, TP; Boulton, EM; Bras, P; Byram, D; Cahn, SB; Carmona-Benitez, MC; Chan, C; Currie, A; Cutter, JE; Davison, TJR; Dobi, A; Dobson, JEY; Druszkiewicz, E; Edwards, BN; Faham, CH; Fallon, SR; Fan, A; Fiorucci, S; Gaitskell, RJ; Gehman, VM; Genovesi, J; Ghag, C; Gilchriese, MGD; Hall, CR; Hanhardt, M; Haselschwardt, SJ; Hertel, SA; Hogan, DP; Horn, M; Huang, DQ; Ignarra, CM; Jacobsen, RG; Ji, W; Kamdin, K; Kazkaz, K; Khaitan, D; Knoche, R; Larsen, NA; Lee, C; Lenardo, BG; Lesko, KT; Lindote, A; Lopes, MI; Manalaysay, A; Mannino, RL; Marzioni, MF; McKinsey, DN; Mei, DM; Mock, J; Moongweluwan, M; Morad, JA; Murphy, ASJ; Nehrkorn, C; Nelson, HN; Neves, F; O'Sullivan, K; Oliver-Mallory, KC; Palladino, KJ; Pease, EK; Reichhart, L; Rhyne, C; Shaw, S; Shutt, TA; Silva, C; Solmaz, M; Solovov, VN; Sorensen, P; Sumner, TJ; Szydagis, M; Taylor, DJ; Taylor, WC; Tennyson, BP; Terman, PA; Tiedt, DR; To, WH; Tripathi, M | Abstract: © 2018 American Physical Society. 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 1.4×104 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.
A Bernstein - One of the best experts on this subject based on the ideXlab platform.
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low energy physics reach of xenon detectors for Nuclear recoil based dark matter and neutrino experiments
Physical Review Letters, 2019Co-Authors: B G Lenardo, Jun Xu, S Pereverzev, O A Akindele, Daniel Naim, J Kingston, A Bernstein, K Kazkaz, M Tripathi, L LiAbstract:: Dual-phase xenon detectors lead the search for keV-scale Nuclear recoil signals expected from the Scattering of weakly interacting massive particle (WIMP) dark matter, and can potentially be used to study the coherent Nuclear Scattering of MeV-scale neutrinos. New capabilities of such experiments can be enabled by extending their Nuclear recoil searches down to the lowest measurable energy. The response of the liquid xenon target medium to Nuclear recoils, however, is not well characterized below a few keV, leading to large uncertainties in projected sensitivities. In this work, we report a new measurement of ionization signals from Nuclear recoils in liquid xenon down to the lowest energy reported to date. At 0.3 keV, we find that the average recoil produces approximately one ionization electron; this is the first measurement of Nuclear recoil signals at the single-ionization-electron level, approaching the physical limit of liquid xenon ionization detectors. We discuss the implications of these measurements on the physics reach of xenon detectors for Nuclear-recoil-based WIMP dark matter searches and the detection of coherent elastic neutrino-nucleus Scattering.
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calibration event reconstruction data analysis and limit calculation for the lux dark matter experiment
Physical Review D, 2018Co-Authors: D S Akerib, A Bernstein, S Alsum, H M Araujo, X Bai, A J Bailey, J Balajthy, P Beltrame, E P Bernard, T P BiesiadzinskiAbstract: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 1.4×104 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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calibration event reconstruction data analysis and limit calculation for the lux dark matter experiment
Physical Review D, 2018Co-Authors: D S Akerib, A Bernstein, S Alsum, H M Araujo, X Bai, A J Bailey, J Balajthy, P Beltrame, E P Bernard, T P BiesiadzinskiAbstract:Author(s): Akerib, DS; Alsum, S; Araujo, HM; Bai, X; Bailey, AJ; Balajthy, J; Beltrame, P; Bernard, EP; Bernstein, A; Biesiadzinski, TP; Boulton, EM; Bras, P; Byram, D; Cahn, SB; Carmona-Benitez, MC; Chan, C; Currie, A; Cutter, JE; Davison, TJR; Dobi, A; Dobson, JEY; Druszkiewicz, E; Edwards, BN; Faham, CH; Fallon, SR; Fan, A; Fiorucci, S; Gaitskell, RJ; Gehman, VM; Genovesi, J; Ghag, C; Gilchriese, MGD; Hall, CR; Hanhardt, M; Haselschwardt, SJ; Hertel, SA; Hogan, DP; Horn, M; Huang, DQ; Ignarra, CM; Jacobsen, RG; Ji, W; Kamdin, K; Kazkaz, K; Khaitan, D; Knoche, R; Larsen, NA; Lee, C; Lenardo, BG; Lesko, KT; Lindote, A; Lopes, MI; Manalaysay, A; Mannino, RL; Marzioni, MF; McKinsey, DN; Mei, DM; Mock, J; Moongweluwan, M; Morad, JA; Murphy, ASJ; Nehrkorn, C; Nelson, HN; Neves, F; O'Sullivan, K; Oliver-Mallory, KC; Palladino, KJ; Pease, EK; Reichhart, L; Rhyne, C; Shaw, S; Shutt, TA; Silva, C; Solmaz, M; Solovov, VN; Sorensen, P; Sumner, TJ; Szydagis, M; Taylor, DJ; Taylor, WC; Tennyson, BP; Terman, PA; Tiedt, DR; To, WH; Tripathi, M | Abstract: © 2018 American Physical Society. 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 1.4×104 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.
D S Akerib - One of the best experts on this subject based on the ideXlab platform.
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calibration event reconstruction data analysis and limit calculation for the lux dark matter experiment
Physical Review D, 2018Co-Authors: D S Akerib, A Bernstein, S Alsum, H M Araujo, X Bai, A J Bailey, J Balajthy, P Beltrame, E P Bernard, T P BiesiadzinskiAbstract: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 1.4×104 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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calibration event reconstruction data analysis and limit calculation for the lux dark matter experiment
Physical Review D, 2018Co-Authors: D S Akerib, A Bernstein, S Alsum, H M Araujo, X Bai, A J Bailey, J Balajthy, P Beltrame, E P Bernard, T P BiesiadzinskiAbstract:Author(s): Akerib, DS; Alsum, S; Araujo, HM; Bai, X; Bailey, AJ; Balajthy, J; Beltrame, P; Bernard, EP; Bernstein, A; Biesiadzinski, TP; Boulton, EM; Bras, P; Byram, D; Cahn, SB; Carmona-Benitez, MC; Chan, C; Currie, A; Cutter, JE; Davison, TJR; Dobi, A; Dobson, JEY; Druszkiewicz, E; Edwards, BN; Faham, CH; Fallon, SR; Fan, A; Fiorucci, S; Gaitskell, RJ; Gehman, VM; Genovesi, J; Ghag, C; Gilchriese, MGD; Hall, CR; Hanhardt, M; Haselschwardt, SJ; Hertel, SA; Hogan, DP; Horn, M; Huang, DQ; Ignarra, CM; Jacobsen, RG; Ji, W; Kamdin, K; Kazkaz, K; Khaitan, D; Knoche, R; Larsen, NA; Lee, C; Lenardo, BG; Lesko, KT; Lindote, A; Lopes, MI; Manalaysay, A; Mannino, RL; Marzioni, MF; McKinsey, DN; Mei, DM; Mock, J; Moongweluwan, M; Morad, JA; Murphy, ASJ; Nehrkorn, C; Nelson, HN; Neves, F; O'Sullivan, K; Oliver-Mallory, KC; Palladino, KJ; Pease, EK; Reichhart, L; Rhyne, C; Shaw, S; Shutt, TA; Silva, C; Solmaz, M; Solovov, VN; Sorensen, P; Sumner, TJ; Szydagis, M; Taylor, DJ; Taylor, WC; Tennyson, BP; Terman, PA; Tiedt, DR; To, WH; Tripathi, M | Abstract: © 2018 American Physical Society. 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 1.4×104 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.
G W F Drake - One of the best experts on this subject based on the ideXlab platform.
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lithium transition energies and isotope shifts qed recoil corrections
Physical Review A, 2002Co-Authors: Zongchao Yan, G W F DrakeAbstract:A QED recoil correction of order (μ/M)α 5 mc 2 recently derived by Pachucki [J. Phys. B 31, 5123 (1998)] is evaluated for lithium in the 1s 2 2s 2 S 1 / 2 , 1s 2 3s 2 S 1 / 2 , and 1s 2 2p 2 P states, and its contribution to the isotope shift is calculated. The new term is shown to be equivalent to the recoil term included in our previous work in a hydrogenic approximation. Total energies are calculated for each of the states in question, including screening corrections to the Bethe logarithm estimated from the two-particle parent states. The results for the total transition frequencies are shown to be in good agreement with experiment, but there are surprisingly large discrepancies between theory and experiment for the isotope shift in the fine structure splitting (SIS) for the 1s 2 p 2 P state. The ionization potential of 7 Li is calculated to be 43487.1520(40) cm - 1 . The estimated accuracy is about the same as the experimental value. A recent measurement of the 7 Li- 6 Li isotope shift for the 2 2 P 1 / 2 -2 2 S 1 / 2 transition determines the difference of the squares of the Nuclear radii to be 0.84(6) fm 2 , which is a factor of 4 more accurate than the value 0.79(25) fm 2 derived from Nuclear Scattering data.
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lithium isotope shifts as a measure of Nuclear size
Physical Review A, 2000Co-Authors: Zongchao Yan, G W F DrakeAbstract:The isotope shifts for $2{}^{2}{P}_{J}$\char21{}$2{}^{2}S$ and $3{}^{2}S$\char21{}$2{}^{2}S$ transition energies in lithium are calculated variationally in Hylleraas coordinates, including nonrelativistic, relativistic, and QED terms up to $O(\ensuremath{\mu}/M),$ $O(\ensuremath{\mu}{/M)}^{2},$ $O({\ensuremath{\alpha}}^{2}\ensuremath{\mu}/M),$ and $O({\ensuremath{\alpha}}^{3}\ensuremath{\mu}/M)$ atomic units, and the lowest-order finite Nuclear size correction. With high-precision isotope shift measurements, our results can potentially yield a precise determination of the Nuclear charge radius for different isotopes of lithium, and especially for the exotic ${}^{11}$Li ``halo'' isotope. For the case of ${}^{7}\mathrm{Li}$-${}^{6}\mathrm{Li},$ using the Nuclear charge radii from Nuclear Scattering data, our calculated isotope shifts for the $2{}^{2}{P}_{1/2}$\char21{}$2{}^{2}S,$ $2{}^{2}{P}_{3/2}$\char21{}$2{}^{2}S,$ and $3{}^{2}S$\char21{}$2{}^{2}S$ transitions are $10534.31(61)(6)$ MHz, $10534.70(61)(6)$ MHz, and $11454.31(39)(5)$ MHz, respectively, where the first brackets indicate the uncertainties due to the Nuclear charge radii, and the second brackets indicate the computational uncertainties. The experimental isotope shifts are inconsistent with each other and with theory for these transitions.
Benjamin R Safdi - One of the best experts on this subject based on the ideXlab platform.
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modulation effects in dark matter electron Scattering experiments
Physical Review D, 2015Co-Authors: Samuel K Lee, Mariangela Lisanti, Siddharth Mishrasharma, Benjamin R SafdiAbstract:One of the next frontiers in dark-matter direct-detection experiments is to explore the MeV to GeV mass regime. Such light dark matter does not carry enough kinetic energy to produce an observable Nuclear recoil, but it can scatter off electrons, leading to a measurable signal. We introduce a semi-analytic approach to characterize the resulting electron-Scattering events in atomic and semiconductor targets, improving on previous analytic proposals that underestimate the signal at high recoil energies. We then use this procedure to study the time-dependent properties of the electron-Scattering signal, including the modulation fraction, higher-harmonic modes and modulation phase. The time dependence can be distinct in a non-trivial way from the Nuclear Scattering case. Additionally, we show that dark-matter interactions inside the Earth can significantly distort the lab-frame phase-space distribution of sub-GeV dark matter.
