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51. Technical Results from the Surface Run of the LUX Dark Matter Experiment

Author

LUX Collaboration, Akerib, D. S., Bai, X., Bernard, E., Bernstein, A., Bradley, A., Byram, D., Cahn, S. B., Carmona-Benitez, M. C., Chapman, J. J., Coffey, T., Dobi, A., Dragowsky, E., Druszkiewicz, E., Edwards, B., Faham, C. H., Fiorucci, S., Gaitskell, R. J., Gibson, K. R., Gilchriese, M., Hall, C., Hanhardt, M., Ihm, M., Jacobsen, R. G., Kastens, L., Kazkaz, K., Knoche, R., Larsen, N., Lee, C., Lesko, K. T., Lindote, A., Lopes, M. I., Lyashenko, A., Malling, D. C., Mannino, R., McKinsey, D. N., Mei, D., Mock, J., Moongweluwan, M., Morii, M., Nelson, H., Neves, F., Nikkel, J. A., Pangilinan, M., Pech, K., Phelps, P., Rodionov, A., Shutt, T., Silva, C., Skulski, W., Solovov, V. N., Sorensen, P., Stiegler, T., Sweany, M., Szydagis, M., Taylor, D., Tripathi, M., Uvarov, S., Verbus, J. R., de Viveiros, L., Walsh, N., Webb, R., White, J. T., Wlasenko, M., Wolfs, F. L. H., Woods, M., and Zhang, C.

Subjects
Astrophysics - Instrumentation and Methods for Astrophysics, High Energy Physics - Experiment, High Energy Physics - Phenomenology, Physics - Instrumentation and Detectors
Abstract

We present the results of the three-month above-ground commissioning run of the Large Underground Xenon (LUX) experiment at the Sanford Underground Research Facility located in Lead, South Dakota, USA. LUX is a 370 kg liquid xenon detector that will search for cold dark matter in the form of Weakly Interacting Massive Particles (WIMPs). The commissioning run, conducted with the detector immersed in a water tank, validated the integration of the various sub-systems in preparation of the underground deployment. Using the data collected, we report excellent light collection properties, achieving 8.4 photoelectrons per keV for 662 keV electron recoils without an applied electric field, measured in the center of the WIMP target. We also find good energy and position resolution in relatively high-energy interactions from a variety of internal and external sources. Finally, we have used the commissioning data to tune the optical properties of our simulation and report updated sensitivity projections for spin-independent WIMP-nucleon scattering.

Published
2012
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52. First Results from the LUX Dark Matter Experiment at the Sanford Underground Research Facility

Author

Akerib, DS, Araújo, HM, Bai, X, Bailey, AJ, Balajthy, J, Bedikian, S, Bernard, E, Bernstein, A, Bolozdynya, A, Bradley, A, Byram, D, Cahn, SB, Carmona-Benitez, MC, Chan, C, Chapman, JJ, Chiller, AA, Chiller, C, Clark, K, Coffey, T, Currie, A, Curioni, A, Dazeley, S, de Viveiros, L, Dobi, A, Dobson, J, Dragowsky, EM, Druszkiewicz, E, Edwards, B, Faham, CH, Fiorucci, S, Flores, C, Gaitskell, RJ, Gehman, VM, Ghag, C, Gibson, KR, Gilchriese, MGD, Hall, C, Hanhardt, M, Hertel, SA, Horn, M, Huang, DQ, Ihm, M, Jacobsen, RG, Kastens, L, Kazkaz, K, Knoche, R, Kyre, S, Lander, R, Larsen, NA, Lee, C, Leonard, DS, Lesko, KT, Lindote, A, Lopes, MI, Lyashenko, A, Malling, DC, Mannino, R, McKinsey, DN, Mei, D-M, Mock, J, Moongweluwan, M, Morad, J, Morii, M, Murphy, A St J, Nehrkorn, C, Nelson, H, Neves, F, Nikkel, JA, Ott, RA, Pangilinan, M, Parker, PD, Pease, EK, Pech, K, Phelps, P, Reichhart, L, Shutt, T, Silva, C, Skulski, W, Sofka, CJ, Solovov, VN, Sorensen, P, Stiegler, T, O'Sullivan, K, Sumner, TJ, Svoboda, R, Sweany, M, Szydagis, M, Taylor, D, Tennyson, B, Tiedt, DR, Tripathi, M, Uvarov, S, Verbus, JR, Walsh, N, Webb, R, White, JT, White, D, Witherell, MS, Wlasenko, M, and Wolfs, FLH

Subjects
Nuclear and Plasma Physics, Particle and High Energy Physics, Physical Sciences, LUX Collaboration, astro-ph.CO, astro-ph.IM, hep-ex, physics.ins-det, Mathematical Sciences, Engineering, General Physics, Mathematical sciences, Physical sciences
Abstract

The Large Underground Xenon (LUX) experiment is a dual-phase xenon time-projection chamber operating at the Sanford Underground Research Facility (Lead, South Dakota). The LUX cryostat was filled for the first time in the underground laboratory in February 2013. We report results of the first WIMP search data set, taken during the period from April to August 2013, presenting the analysis of 85.3 live days of data with a fiducial volume of 118 kg. A profile-likelihood analysis technique shows our data to be consistent with the background-only hypothesis, allowing 90% confidence limits to be set on spin-independent WIMP-nucleon elastic scattering with a minimum upper limit on the cross section of 7.6 × 10(-46) cm(2) at a WIMP mass of 33 GeV/c(2). We find that the LUX data are in disagreement with low-mass WIMP signal interpretations of the results from several recent direct detection experiments.

Published
2014

53. A Detailed Look at the First Results from the Large Underground Xenon (LUX) Dark Matter Experiment

Author

Szydagis, M, Akerib, DS, Araujo, HM, Bai, X, Bailey, AJ, Balajthy, J, Bernard, E, Bernstein, A, Bradley, A, Byram, D, Cahn, SB, Carmona-Benitez, MC, Chan, C, Chapman, JJ, Chiller, AA, Chiller, C, Coffey, T, Currie, A, Viveiros, L de, Dobi, A, Dobson, J, Druszkiewicz, E, Edwards, B, Faham, CH, Fiorucci, S, Flores, C, Gaitskell, RJ, Gehman, VM, Ghag, C, Gibson, KR, Gilchriese, MGD, Hall, C, Hertel, SA, Horn, M, Huang, DQ, Ihm, M, Jacobsen, RG, Kazkaz, K, Knoche, R, Larsen, NA, Lee, C, Lindote, A, Lopes, MI, Malling, DC, Mannino, R, McKinsey, DN, Mei, D-M, Mock, J, Moongweluwan, M, Morad, J, Murphy, A St J, Nehrkorn, C, Nelson, H, Neves, F, Ott, RA, Pangilinan, M, Parker, PD, Pease, EK, Pech, K, Phelps, P, Reichhart, L, Shutt, T, Silva, C, Solovov, VN, Sorensen, P, O'Sullivan, K, Sumner, T, Taylor, D, Tennyson, B, Tiedt, DR, Tripathi, M, Uvarov, S, Verbus, JR, Walsh, N, Webb, R, White, JT, Witherell, MS, Wolfs, FLH, Woods, M, and Zhang, C

Subjects
hep-ex, astro-ph.CO, astro-ph.IM, physics.ins-det
Abstract

LUX, the world's largest dual-phase xenon time-projection chamber, with afiducial target mass of 118 kg and 10,091 kg-days of exposure thus far, iscurrently the most sensitive direct dark matter search experiment. The initialnull-result limit on the spin-independent WIMP-nucleon scattering cross-sectionwas released in October 2013, with a primary scintillation threshold of 2 phe,roughly 3 keVnr for LUX. The detector has been deployed at the SanfordUnderground Research Facility (SURF) in Lead, South Dakota, and is the firstexperiment to achieve a limit on the WIMP cross-section lower than $10^{-45}$cm$^{2}$. Here we present a more in-depth discussion of the novel energy scaleemployed to better understand the nuclear recoil light and charge yields, andof the calibration sources, including the new internal tritium source. We foundthe LUX data to be in conflict with low-mass WIMP signal interpretations ofother results.

Published
2014

54. Direct search for dark matter with two-phase xenon detectors: Current status of LUX and plans for LZ

Author

Akerib, DS, Araújo, HM, Bai, X, Bailey, AJ, Balajthy, J, Bernard, E, Bernstein, A, Bradley, A, Byram, D, Cahn, SB, Carmona-Benitez, MC, Chan, C, Chapman, JJ, Chiller, AA, Chiller, C, Coffey, T, Currie, A, De Viveiros, L, Dobi, A, Dobson, J, Druszkiewicz, E, Edwards, B, Faham, CH, Fiorucci, S, Flores, C, Gaitskell, RJ, Gehman, VM, Ghag, C, Gibson, KR, Gilchriese, MGD, Hall, C, Hertel, SA, Horn, M, Huang, DQ, Ihm, M, Jacobsen, RG, Kazkaz, K, Knoche, R, Larsen, NA, Lee, C, Lenardo, B, Lesko, KT, Lindote, A, Lopes, MI, Malling, DC, Man-Nino, R, McKinsey, DN, Mei, DM, Mock, J, Moongweluwan, M, Morad, J, Murphy, ASJ, Nehrkorn, C, Nelson, H, Neves, F, Ott, RA, Pangilinan, M, Parker, PD, Pease, EK, Pech, K, Phelps, P, Reichhart, L, Shutt, T, Silva, C, Solovov, VN, Sorensen, P, O'Sullivan, K, Sumner, TJ, Szydagis, M, Tay-Lor, D, Tennyson, B, Tiedt, DR, Tripathi, M, Uvarov, S, Verbus, JR, Walsh, N, Webb, R, White, JT, Witherell, MS, Wolfs, FLH, Woods, M, and Zhang, C

Abstract

The search for dark matter reaches back generations and remains one of the most compelling endeavors in the hunt for physics beyond the Standard Model. Experiments attempting to directly detect WIMP dark matter have made re-markable progress in increasing sensitivity to elastic scattering of WIMPs on nuclei. The LUX experiment is a 370-kg, two-phase, xenon TPC currently running at SURF, 4850 feet below Lead, SD. LUX recently completed its first science run and was sensitive to spin independent WIMP scattering at cross sections below 10-45 cm2 for WIMP masses of approximately 20 to 80 GeV. Preparations for the final science run of LUX are currently underway, with final results expected in 2015. We will present results from and current status of the LUX experiment, as well as plans for a follow-on, multi-ton-scale xenon experiment at SURF.

Published
2014

55. Results from the LUX dark matter experiment

Author

Horn, M, Akerib, DS, Arau jo, HM, Bai, X, Bailey, AJ, Balajthy, J, Bernard, E, Bernstein, A, Bradley, A, Byram, D, Cahn, SB, Carmona-Benitez, MC, Chan, C, Chapman, JJ, Chiller, AA, Chiller, C, Currie, A, de Viveiros, L, Dobi, A, Dobson, J, Druszkiewicz, E, Edwards, B, Faham, CH, Fiorucci, S, Flores, C, Gaitskell, RJ, Gehman, VM, Ghag, C, Gibson, KR, Gilchriese, MGD, Hall, C, Hanhardt, M, Haselschwardt, S, Hertel, SA, Huang, DQ, Ihm, M, Jacobsen, RG, Kazkaz, K, Knoche, R, Larsen, NA, Lee, C, Lenardo, B, Lesko, KT, Lindote, A, Lopes, MI, Malling, DC, Mannino, R, McKinsey, DN, Mei, DM, Mock, J, Moongweluwan, M, Morad, J, Murphy, ASJ, Nehrkorn, C, Nelson, H, Neves, F, Ott, RA, Pangilinan, M, Parker, PD, Pease, EK, Pech, K, Phelps, P, Reichhart, L, Shutt, T, Silva, C, Solovov, VN, Sorensen, P, O'Sullivan, K, Sumner, TJ, Szydagis, M, Taylor, D, Tennyson, B, Tiedt, DR, Tripathi, M, Uvarov, S, Verbus, JR, Walsh, N, Webb, R, White, JT, Witherell, MS, Wolfs, FLH, Woods, M, and Zhang, C

Subjects
Dark matter, WIMP, Liquid xenon, Time projection chamber, Nuclear & Particles Physics, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Other Physical Sciences
Abstract

© 2014 Elsevier B.V. The LUX (Large Underground Xenon) experiment aims at the direct detection of dark matter particles via their collisions with xenon nuclei. The 370. kg two-phase liquid xenon time projection chamber measures simultaneously the scintillation and ionization from interactions in the target. The ratio of these two signals provides very good discrimination between potential nuclear recoil and electronic recoil signals to search for WIMP-nucleon scattering. The LUX detector operates at the Sanford Underground Research Facility (Lead, South Dakota, USA) since February 2013. First results were presented in late 2013 setting the world's most stringent limits on WIMP-nucleon scattering cross-sections over a wide range of WIMP masses. A 300 day run beginning in 2014 will further improve the sensitivity and new calibration techniques will reduce systematics for the WIMP signal search.

Published
2014

56. Chromatographic separation of radioactive noble gases from xenon

Author

Akerib, D.S., Araújo, H.M., Bai, X., Bailey, A.J., Balajthy, J., Beltrame, P., Bernard, E.P., Bernstein, A., Biesiadzinski, T.P., Boulton, E.M., Bramante, R., Cahn, S.B., Carmona-Benitez, M.C., Chan, C., Chiller, A.A., Chiller, C., Coffey, T., Currie, A., Cutter, J.E., Davison, T.J.R., Dobi, A., Dobson, J.E.Y., Druszkiewicz, E., Edwards, B.N., Faham, C.H., Fiorucci, S., Gaitskell, R.J., Gehman, V.M., Ghag, C., Gibson, K.R., Gilchriese, M.G.D., Hall, C.R., Hanhardt, M., Haselschwardt, S.J., Hertel, S.A., Hogan, D.P., Horn, M., Huang, D.Q., Ignarra, C.M., Ihm, M., Jacobsen, R.G., Ji, W., Kamdin, K., Kazkaz, K., Khaitan, D., Knoche, R., Larsen, N.A., Lee, C., Lenardo, B.G., Lesko, K.T., Lindote, A., Lopes, M.I., Manalaysay, A., Mannino, R.L., Marzioni, M.F., McKinsey, D.N., Mei, D.-M., Mock, J., Moongweluwan, M., Morad, J.A., Murphy, A.St.J., Nehrkorn, C., Nelson, H.N., Neves, F., O’Sullivan, K., Oliver-Mallory, K.C., Palladino, K.J., Pease, E.K., Pech, K., Phelps, P., Reichhart, L., Rhyne, C., Shaw, S., Shutt, T.A., Silva, C., Solovov, V.N., Sorensen, P., Stephenson, S., Sumner, T.J., Szydagis, M., Taylor, D.J., Taylor, W., Tennyson, B.P., Terman, P.A., Tiedt, D.R., To, W.H., Tripathi, M., Tvrznikova, L., Uvarov, S., Verbus, J.R., Webb, R.C., White, J.T., Whitis, T.J., Witherell, M.S., Wolfs, F.L.H., Yazdani, K., Young, S.K., and Zhang, C.

Published
2018
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57. Technical results from the surface run of the LUX dark matter experiment

Author

Akerib, DS, Bai, X, Bernard, E, Bernstein, A, Bradley, A, Byram, D, Cahn, SB, Carmona-Benitez, MC, Chapman, JJ, Coffey, T, Dobi, A, Dragowsky, E, Druszkiewicz, E, Edwards, B, Faham, CH, Fiorucci, S, Gaitskell, RJ, Gibson, KR, Gilchriese, M, Hall, C, Hanhardt, M, Ihm, M, Jacobsen, RG, Kastens, L, Kazkaz, K, Knoche, R, Larsen, N, Lee, C, Lesko, KT, Lindote, A, Lopes, MI, Lyashenko, A, Malling, DC, Mannino, R, McKinsey, DN, Mei, D, Mock, J, Moongweluwan, M, Morii, M, Nelson, H, Neves, F, Nikkel, JA, Pangilinan, M, Pech, K, Phelps, P, Rodionov, A, Shutt, T, Silva, C, Skulski, W, Solovov, VN, Sorensen, P, Stiegler, T, Sweany, M, Szydagis, M, Taylor, D, Tripathi, M, Uvarov, S, Verbus, JR, de Viveiros, L, Walsh, N, Webb, R, White, JT, Wlasenko, M, Wolfs, FLH, Woods, M, and Zhang, C

Subjects
Nuclear and Plasma Physics, Particle and High Energy Physics, Physical Sciences, Liquid xenon detectors, Dark matter, WIMP, Direct detection, astro-ph.IM, hep-ex, hep-ph, physics.ins-det, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Nuclear & Particles Physics, Astronomical sciences, Particle and high energy physics
Abstract

We present the results of the three-month above-ground commissioning run of the Large Underground Xenon (LUX) experiment at the Sanford Underground Research Facility located in Lead, South Dakota, USA. LUX is a 370 kg liquid xenon detector that will search for cold dark matter in the form of Weakly Interacting Massive Particles (WIMPs). The commissioning run, conducted with the detector immersed in a water tank, validated the integration of the various sub-systems in preparation for the underground deployment. Using the data collected, we report excellent light collection properties, achieving 8.4 photoelectrons per keV for 662 keV electron recoils without an applied electric field, measured in the center of the WIMP target. We also find good energy and position resolution in relatively high-energy interactions from a variety of internal and external sources. Finally, we have used the commissioning data to tune the optical properties of our simulation and report updated sensitivity projections for spin-independent WIMP-nucleon scattering. © 2013 Elsevier B.V. All rights reserved.

Published
2013

58. The Large Underground Xenon (LUX) experiment

Author

Akerib, DS, Bai, X, Bedikian, S, Bernard, E, Bernstein, A, Bolozdynya, A, Bradley, A, Byram, D, Cahn, SB, Camp, C, Carmona-Benitez, MC, Carr, D, Chapman, JJ, Chiller, A, Chiller, C, Clark, K, Classen, T, Coffey, T, Curioni, A, Dahl, E, Dazeley, S, de Viveiros, L, Dobi, A, Dragowsky, E, Druszkiewicz, E, Edwards, B, Faham, CH, Fiorucci, S, Gaitskell, RJ, Gibson, KR, Gilchriese, M, Hall, C, Hanhardt, M, Holbrook, B, Ihm, M, Jacobsen, RG, Kastens, L, Kazkaz, K, Knoche, R, Kyre, S, Kwong, J, Lander, R, Larsen, NA, Lee, C, Leonard, DS, Lesko, KT, Lindote, A, Lopes, MI, Lyashenko, A, Malling, DC, Mannino, R, Marquez, Z, McKinsey, DN, Mei, D-M, Mock, J, Moongweluwan, M, Morii, M, Nelson, H, Neves, F, Nikkel, JA, Pangilinan, M, Parker, PD, Pease, EK, Pech, K, Phelps, P, Rodionov, A, Roberts, P, Shei, A, Shutt, T, Silva, C, Skulski, W, Solovov, VN, Sofka, CJ, Sorensen, P, Spaans, J, Stiegler, T, Stolp, D, Svoboda, R, Sweany, M, Szydagis, M, Taylor, D, Thomson, J, Tripathi, M, Uvarov, S, Verbus, JR, Walsh, N, Webb, R, White, D, White, JT, Whitis, TJ, Wlasenko, M, Wolfs, FLH, Woods, M, and Zhang, C

Subjects
Nuclear and Plasma Physics, Particle and High Energy Physics, Physical Sciences, Dark matter detectors, Liquid xenon, physics.ins-det, hep-ex, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Other Physical Sciences, Nuclear & Particles Physics, Nuclear and plasma physics
Abstract

The Large Underground Xenon (LUX) collaboration has designed and constructed a dual-phase xenon detector, in order to conduct a search for Weakly Interacting Massive Particles (WIMPs), a leading dark matter candidate. The goal of the LUX detector is to clearly detect (or exclude) WIMPS with a spin independent cross-section per nucleon of 2×10-46cm2, equivalent to ∼1event/100kg/month in the inner 100-kg fiducial volume (FV) of the 370-kg detector. The overall background goals are set to have

Published
2013

60. FPGA-based trigger system for the LUX dark matter experiment

Author

Akerib, D.S., Araújo, H.M., Bai, X., Bailey, A.J., Balajthy, J., Beltrame, P., Bernard, E.P., Bernstein, A., Biesiadzinski, T.P., Boulton, E.M., Bradley, A., Bramante, R., Cahn, S.B., Carmona-Benitez, M.C., Chan, C., Chapman, J.J., Chiller, A.A., Chiller, C., Currie, A., Cutter, J.E., Davison, T.J.R., de Viveiros, L., Dobi, A., Dobson, J.E.Y., Druszkiewicz, E., Edwards, B.N., Faham, C.H., Fiorucci, S., Gaitskell, R.J., Gehman, V.M., Ghag, C., Gibson, K.R., Gilchriese, M.G.D., Hall, C.R., Hanhardt, M., Haselschwardt, S.J., Hertel, S.A., Hogan, D.P., Horn, M., Huang, D.Q., Ignarra, C.M., Ihm, M., Jacobsen, R.G., Ji, W., Kazkaz, K., Khaitan, D., Knoche, R., Larsen, N.A., Lee, C., Lenardo, B.G., Lesko, K.T., Lindote, A., Lopes, M.I., Malling, D.C., Manalaysay, A.G., Mannino, R.L., Marzioni, M.F., McKinsey, D.N., Mei, D.-M., Mock, J., Moongweluwan, M., Morad, J.A., Murphy, A.St.J., Nehrkorn, C., Nelson, H.N., Neves, F., O׳Sullivan, K., Oliver-Mallory, K.C., Ott, R.A., Palladino, K.J., Pangilinan, M., Pease, E.K., Phelps, P., Reichhart, L., Rhyne, C., Shaw, S., Shutt, T.A., Silva, C., Skulski, W., Solovov, V.N., Sorensen, P., Stephenson, S., Sumner, T.J., Szydagis, M., Taylor, D.J., Taylor, W., Tennyson, B.P., Terman, P.A., Tiedt, D.R., To, W.H., Tripathi, M., Tvrznikova, L., Uvarov, S., Verbus, J.R., Webb, R.C., White, J.T., Whitis, T.J., Witherell, M.S., Wolfs, F.L.H., Yin, J., Young, S.K., and Zhang, C.

Published
2016
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61. First Results of the LUX Dark Matter Experiment

Author

Akerib, D.S., Araújo, H.M., Bai, X., Bailey, A.J., Balajthy, J., Beltrame, P., Bernard, E., Bernstein, A., Bradley, A., Byram, D., Cahn, S.B., Chan, C., Chapman, J.J., Chiller, A.A., Chiller, C., Currie, A., de Viveiros, L., Dobi, A., Dobson, J., Druszkiewicz, E., Edwards, B., Faham, C.H., Fiorucci, S., Flores, C., Gaitskell, R.J., Gehman, V.M., Ghag, C., Gibson, K.R., Gilchriese, M.G.D., Hall, C., Hanhardt, M., Haselschwardt, S., Hertel, S.A., Horn, M., Huang, D.Q., Ihm, M., Jacobsen, R.G., Kazkaz, K., Knoche, R., Larsen, N.A., Lee, C., Lenardo, B., Lesko, K.T., Lindote, A., Lopes, M.I., Malling, D.C., Manalaysay, A., Mannino, R., McKinsey, D.N., Mei, D.-M., Mock, J., Moongweluwan, M., Morad, J., Murphy, A.St.J., Nehrkorn, C., Nelson, H., Neves, F., Ott, R.A., Pangilinan, M., Parker, P.D., Pease, E.K., Pech, K., Phelps, P., Reichhart, L., Shutt, T., Silva, C., Solovov, V.N., Sorensen, P., O'Sullivan, K., Sumner, T.J., Szydagis, M., Taylor, D., Tennyson, B., Tiedt, D.R., Tripathi, M., Tvrznikova, L., Uvarov, S., Verbus, J.R., Walsh, N., Webb, R., White, J.T., Witherell, M.S., Wolfs, F.L.H., Woods, M., Zhang, C., and Carmona-Benitez, M.C.

Published
2016
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62. Radiogenic and muon-induced backgrounds in the LUX dark matter detector

Author

Akerib, D.S., Araújo, H.M., Bai, X., Bailey, A.J., Balajthy, J., Bernard, E., Bernstein, A., Bradley, A., Byram, D., Cahn, S.B., Carmona-Benitez, M.C., Chan, C., Chapman, J.J., Chiller, A.A., Chiller, C., Coffey, T., Currie, A., de Viveiros, L., Dobi, A., Dobson, J., Druszkiewicz, E., Edwards, B., Faham, C.H., Fiorucci, S., Flores, C., Gaitskell, R.J., Gehman, V.M., Ghag, C., Gibson, K.R., Gilchriese, M.G.D., Hall, C., Hertel, S.A., Horn, M., Huang, D.Q., Ihm, M., Jacobsen, R.G., Kazkaz, K., Knoche, R., Larsen, N.A., Lee, C., Lindote, A., Lopes, M.I., Malling, D.C., Mannino, R., McKinsey, D.N., Mei, D.-M., Mock, J., Moongweluwan, M., Morad, J., Murphy, A.St.J., Nehrkorn, C., Nelson, H., Neves, F., Ott, R.A., Pangilinan, M., Parker, P.D., Pease, E.K., Pech, K., Phelps, P., Reichhart, L., Shutt, T., Silva, C., Solovov, V.N., Sorensen, P., O’Sullivan, K., Sumner, T.J., Szydagis, M., Taylor, D., Tennyson, B., Tiedt, D.R., Tripathi, M., Uvarov, S., Verbus, J.R., Walsh, N., Webb, R., White, J.T., Witherell, M.S., Wolfs, F.L.H., Woods, M., and Zhang, C.

Published
2015
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63. Radon-related Backgrounds in the LUX Dark Matter Search

Author

Bradley, A., Akerib, D.S., Araújo, H.M., Bai, X., Bailey, A.J., Balajthy, J., Bernard, E., Bernstein, A., Byram, D., Cahn, S.B., Carmona-Benitez, M.C., Chan, C., Chapman, J.J., Chiller, A.A., Chiller, C., Coffey, T., Currie, A., de Viveiros, L., Dobi, A., Dobson, J., Druszkiewicz, E., Edwards, B., Faham, C.H., Fiorucci, S., Flores, C., Gaitskell, R.J., Gehman, V.M., Ghag, C., Gibson, K.R., Gilchriese, M.G.D., Hall, C., Hertel, S.A., Horn, M., Huang, D.Q., Ihm, M., Jacobsen, R.G., Kazkaz, K., Knoche, R., Larsen, N.A., Lee, C., Lindote, A., Lopes, M.I., Malling, D.C., Mannino, R., McKinsey, D.N., Mei, D.-M., Mock, J., Moongweluwan, M., Morad, J., Murphy, A.St.J., Nehrkorn, C., Nelson, H., Neves, F., Ott, R.A., Pangilinan, M., Parker, P.D., Pease, E.K., Pech, K., Phelps, P., Reichhart, L., Shutt, T., Silva, C., Solovov, V.N., Sorensen, P., O'Sullivan, K., Sumner, T.J., Szydagis, M., Taylor, D., Tennyson, B., Tiedt, D.R., Tripathi, M., Uvarov, S., Verbus, J.R., Walsh, N., Webb, R., White, J.T., Witherell, M.S., Wolfs, F.L.H., Woods, M., and Zhang, C.

Published
2015
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64. The LUX Experiment

Author

Akerib, D.S., Araújo, H.M., Bai, X., Bailey, A.J., Balajthy, J., Bernard, E., Bernstein, A., Bradley, A., Byram, D., Cahn, S.B., Carmona-Benitez, M.C., Chan, C., Chapman, J.J., Chiller, A.A., Chiller, C., Coffey, T., Currie, A., de Viveiros, L., Dobi, A., Dobson, J., Druszkiewicz, E., Edwards, B., Faham, C.H., Fiorucci, S., Flores, C., Gaitskell, R.J., Gehman, V.M., Ghag, C., Gibson, K.R., Gilchriese, M.G.D., Hall, C., Hertel, S.A., Horn, M., Huang, D.Q., Ihm, M., Jacobsen, R.G., Kazkaz, K., Knoche, R., Larsen, N.A., Lee, C., Lindote, A., Lopes, M.I., Malling, D.C., Mannino, R., McKinsey, D.N., Mei, D.-M., Mock, J., Moongweluwan, M., Morad, J., Murphy, A.St.J., Nehrkorn, C., Nelson, H., Neves, F., Ott, R.A., Pangilinan, M., Parker, P.D., Pease, E.K., Pech, K., Phelps, P., Reichhart, L., Shutt, T., Silva, C., Solovov, V.N., Sorensen, P., O'Sullivan, K., Sumner, T.J., Szydagis, M., Taylor, D., Tennyson, B., Tiedt, D.R., Tripathi, M., Uvarov, S., Verbus, J.R., Walsh, N., Webb, R., White, J.T., Witherell, M.S., Wolfs, F.L.H., Woods, M., and Zhang, C.

Published
2015
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65. Technical results from the surface run of the LUX dark matter experiment

Author

Akerib, D.S., Bai, X., Bernard, E., Bernstein, A., Bradley, A., Byram, D., Cahn, S.B., Carmona-Benitez, M.C., Chapman, J.J., Coffey, T., Dobi, A., Dragowsky, E., Druszkiewicz, E., Edwards, B., Faham, C.H., Fiorucci, S., Gaitskell, R.J., Gibson, K.R., Gilchriese, M., Hall, C., Hanhardt, M., Ihm, M., Jacobsen, R.G., Kastens, L., Kazkaz, K., Knoche, R., Larsen, N., Lee, C., Lesko, K.T., Lindote, A., Lopes, M.I., Lyashenko, A., Malling, D.C., Mannino, R., McKinsey, D.N., Mei, D., Mock, J., Moongweluwan, M., Morii, M., Nelson, H., Neves, F., Nikkel, J.A., Pangilinan, M., Pech, K., Phelps, P., Rodionov, A., Shutt, T., Silva, C., Skulski, W., Solovov, V.N., Sorensen, P., Stiegler, T., Sweany, M., Szydagis, M., Taylor, D., Tripathi, M., Uvarov, S., Verbus, J.R., de Viveiros, L., Walsh, N., Webb, R., White, J.T., Wlasenko, M., Wolfs, F.L.H., Woods, M., and Zhang, C.

Published
2013
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66. Extending light WIMP searches to single scintillation photons in LUX

Author

Akerib, D. S., Alsum, S., Ara��jo, H. M., Bai, X., Bailey, A. J., Balajthy, J., Baxter, A., Beltrame, P., Bernard, E. P., Bernstein, A., Biesiadzinski, T. P., Boulton, E. M., Boxer, B., Br��s, P., Burdin, S., Byram, D., Cahn, S. B., Carmona-Benitez, M. C., Chan, C., Chiller, A. A., Chiller, C., Currie, A., Cutter, J. E., de Viveiros, L., Dobi, A., Dobson, J. E. Y., Druszkiewicz, E., Edwards, B. N., Faham, C. H., Fallon, S. R., Fan, A., Fiorucci, S., Gaitskell, R. J., Gehman, V. M., Genovesi, J., Ghag, C., Gibson, K. R., Gilchriese, M. G. D., Grace, E., Gwilliam, C., Hall, C. R., Hanhardt, M., Haselschwardt, S. J., Hertel, S. A., Hogan, D. P., Horn, M., Huang, D. Q., Ignarra, C. M., Jacobsen, R. G., Jahangir, O., Ji, W., Kamdin, K., Kazka, K., Khaitan, D., Knoche, R., Korolkova, E. V., Kravitz, S., Kudryavtsev, V. A., Larsen, N. A., Leason, E., Lee, C., Lenardo, B. G., Lesko, K. T., Levy, C., Liao, J., Lin, J., Lindote, A., Lopes, M. I., L��pez-Paredes, B., Manalaysay, A., Mannino, R. L., Marangou, N., Marzioni, M. F., McKinsey, D. N., Mei, D. M., Mock, J., Moongweluwan, M., Morad, J. A., Murphy, A. St. J., Naylor, A., Nehrkorn, C., Nelson, H. N., Neves, F., Nilima, A., O'Sullivan, K., Oliver-Mallory, K. C., Palladino, K. J., Pease, E. K., Reichhart, L., Riffard, Q., Rischbieter, G. R. C., Rossiter, P., Shaw, S., Shutt, T. A., Silva, C., Solmaz, M., Solovov, V. N., Sorensen, P., Stephenson, S., Sumner, T. J., Szydagis, M., Taylor, D. J., Taylor, R., Taylor, W. C., Tennyson, B. P., Terman, P. A., Tiedt, D. R., To, W. H., Tripathi, M., Tvrznikova, L., Utku, U., Uvarov, S., Vacheret, A., Velan, V., Verbus, J. R., Webb, R. C., White, J. T., Whitis, T. J., Witherell, M. S., Wolfs, F. L. H., Woodward, D., Xu, J., Yazdani, K., Young, S. K., Zhang, C., and Science and Technology Facilities Council (STFC)

Subjects
BACKGROUNDS, Photomultiplier, Physics - Instrumentation and Detectors, Cosmology and Nongalactic Astrophysics (astro-ph.CO), Photon, Physics::Instrumentation and Detectors, Dark matter, FOS: Physical sciences, chemistry.chemical_element, Astronomy & Astrophysics, 01 natural sciences, 7. Clean energy, High Energy Physics - Experiment, Physics, Particles & Fields, Nuclear physics, High Energy Physics - Experiment (hep-ex), XENON, Xenon, WIMP, 0103 physical sciences, 010306 general physics, Instrumentation and Methods for Astrophysics (astro-ph.IM), physics.ins-det, Physics, Scintillation, Science & Technology, hep-ex, 010308 nuclear & particles physics, Astrophysics::Instrumentation and Methods for Astrophysics, Instrumentation and Detectors (physics.ins-det), chemistry, Weakly interacting massive particles, Physical Sciences, astro-ph.CO, Neutrino, Astrophysics - Instrumentation and Methods for Astrophysics, EMISSION, Astrophysics - Cosmology and Nongalactic Astrophysics, astro-ph.IM
Abstract

We present a novel analysis technique for liquid xenon time projection chambers that allows for a lower threshold by relying on events with a prompt scintillation signal consisting of single detected photons. The energy threshold of the LUX dark matter experiment is primarily determined by the smallest scintillation response detectable, which previously required a twofold coincidence signal in its photomultiplier arrays, enforced in data analysis. The technique presented here exploits the double photoelectron emission effect observed in some photomultiplier models at vacuum ultraviolet wavelengths. We demonstrate this analysis using an electron recoil calibration dataset and place new constraints on the spin-independent scattering cross section of weakly interacting massive particles (WIMPs) down to 2.5 GeV / c 2 WIMP mass using the 2013 LUX dataset. This new technique is promising to enhance light WIMP and astrophysical neutrino searches in next-generation liquid xenon experiments.

Published
2020

67. Complete substitution of Si for Ti in titanite Ca(Ti(sub 1-x)Si)(sub x)(super VI)Si(super IV)O5

Author

Knoche, R., Angel, R.J., Seifert, F., and Fliervoet, T.F.

Subjects
Silicon -- Research, Titanium -- Research, Perovskite -- Research, Earth sciences
Abstract

Phase relations on the join CaTiSi [O.sub.5]-Ca[Si.sub.2][O.sub.5] were determined at 1350 [degrees] C over the pressure range 3.5-12 GPa by a combination of synthesis and reversal experiments in a piston cylinder and a multi-anvil press. Titanite-like phases were recovered from all experiments in this pressure range. At 3.5 GPa the maximum [Si.sup.VI] content of titanite is 3.0 [+ or -] 0.6 mol%, whereas bulk compositions with higher Si content yield a mixture of titanite solid solution plus coesite and walstromite-structured CaSi[O.sub.3]. The maximum SiTM content of the titanite increases with pressure to 21 [+ or -] 2 mol% at 7 GPa and 46 [+ or -] 2 mol% at 7.5 GPa. At pressures of 8.5 to 12 GPa all intermediate compositions yield a single titanite phase. X-ray and TEM analysis show that these have the A2/a symmetry of the titanite aristotype. The variations of the room-pressure unit-cell parameters of the A2/a phases with composition can be described by the equations a [[Angstrom]] = 7.040(9) - 0.492(15) X([Si.sup.VI]); b [[Angstrom]] = 8.713(7) - 0.316(11) X([Si.sup.VI]); c [[Angstrom]] = 6.564(4) - 0.220(7) X([Si.sup.VI]); [Beta] [[degrees]] = 113.721(6) - 0.537(12) [X.sup.2]([Si.sup.VI]); V (cell) [[[Angstrom].sup.3]] = 367.8(9) - 47.5(1.6) X([Si.sup.VI]). For the Ca[Si.sub.2][O.sub.5] composition the recovered material has II symmetry but is known to transform back to A2/a titanite structure at 0.2 GPa at room temperature. Similarly, with increasing pressure the P2/a CaTiSi[O.sub.5] transforms to A2/a symmetry at 3.6 GPa at room temperature. The conclusion is that at 1350 [degrees] C and pressures in excess of 8.5 GPa there is complete solid solution between CaTiSiO5 and CaSi2[O.sub.5] based upon the isovalent exchange of Si for Ti in the octahedral site of the A2/a structure. Rietveld structure analysis of intermediate compositions reveals no evidence for ordering or intermediate phases. Preliminary experiments at pressures between 13.5 GPa and 16 GPa yielded mixtures of titanite solid solution plus perovskite and stishovite. From these data and information on the phase relations for the CaSi[O.sub.3]-CaTi[O.sub.3] join the topology of the phase relations between [approximately]3 and [approximately]13 GPa in the central part of the CaO-Ti[O.sub.2]-Si[O.sub.2] ternary have been deduced.

Published
1998

70. The effect of F on the density of haplogranite melt

Author

Dingwell, D.B., Knoche, R., and Webb, S.L.

Subjects
Granite -- Composition, Fluorine -- Analysis, Calorimetry -- Methods, Petrogenesis -- Research, Earth sciences
Abstract

A combination of scanning calorimetry and dilatometry analysis was used to study silicate expansivity-temperature relationships and to derive a density model for granite and pegmatite petrogenesis based from the characteristics of the haplogranitic melt. The addition of 4.55 wt% fluorine reduces the density of haplogranitic melts at 750 degrees C from 2.295 g/cm3 to 2.261 g/cm3. This, in turn, accelerates the gravity-driven crystal-melt fractionation processes.

Published
1993

71. The effect of B2O3 on the viscosity of haplogranitic liquids

Author

Dingwell, D.B., Knoche, R., Webb, S.L., and Pichavant, M.

Subjects
Viscosity -- Research, Granite -- Research, Petrogenesis -- Research, Earth sciences
Abstract

A study was conducted on the influence of B2O3 on the viscosity of haplogranatic liquids. A nonlinear decrease of viscosity was observed in haplogranite liquids with the introduction of B2O3. The liquids were subjected to a temperature interval of 600 to 1,600 degrees Celsius. The temperature dependence of the viscosity of the liquids tested was found to be Arrhenian. The results show that boron must be treated as a fluxing agent in boron-rich and pegmatitic systems.

Published
1992

72. A Detailed Look at the First Results from the Large Underground Xenon (LUX) Dark Matter Experiment

Author

Szydagis, M, Akerib, DS, Araujo, HM, Bai, X, Bailey, AJ, Balajthy, J, Bernard, E, Bernstein, A, Bradley, A, Byram, D, Cahn, SB, Carmona-Benitez, MC, Chan, C, Chapman, JJ, Chiller, AA, Chiller, C, Coffey, T, Currie, A, Viveiros, L de, Dobi, A, Dobson, J, Druszkiewicz, E, Edwards, B, Faham, CH, Fiorucci, S, Flores, C, Gaitskell, RJ, Gehman, VM, Ghag, C, Gibson, KR, Gilchriese, MGD, Hall, C, Hertel, SA, Horn, M, Huang, DQ, Ihm, M, Jacobsen, RG, Kazkaz, K, Knoche, R, Larsen, NA, Lee, C, Lindote, A, Lopes, MI, Malling, DC, Mannino, R, McKinsey, DN, Mei, D-M, Mock, J, Moongweluwan, M, Morad, J, Murphy, A St J, Nehrkorn, C, Nelson, H, Neves, F, Ott, RA, Pangilinan, M, Parker, PD, Pease, EK, Pech, K, Phelps, P, Reichhart, L, Shutt, T, Silva, C, Solovov, VN, Sorensen, P, O'Sullivan, K, Sumner, T, Taylor, D, Tennyson, B, Tiedt, DR, Tripathi, M, Uvarov, S, Verbus, JR, Walsh, N, Webb, R, White, JT, Witherell, MS, Wolfs, FLH, Woods, M, and Zhang, C

Subjects
High Energy Physics - Experiment (hep-ex), Physics - Instrumentation and Detectors, Cosmology and Nongalactic Astrophysics (astro-ph.CO), hep-ex, astro-ph.CO, FOS: Physical sciences, Instrumentation and Detectors (physics.ins-det), Astrophysics - Instrumentation and Methods for Astrophysics, Instrumentation and Methods for Astrophysics (astro-ph.IM), physics.ins-det, High Energy Physics - Experiment, Astrophysics - Cosmology and Nongalactic Astrophysics, astro-ph.IM
Abstract

LUX, the world's largest dual-phase xenon time-projection chamber, with a fiducial target mass of 118 kg and 10,091 kg-days of exposure thus far, is currently the most sensitive direct dark matter search experiment. The initial null-result limit on the spin-independent WIMP-nucleon scattering cross-section was released in October 2013, with a primary scintillation threshold of 2 phe, roughly 3 keVnr for LUX. The detector has been deployed at the Sanford Underground Research Facility (SURF) in Lead, South Dakota, and is the first experiment to achieve a limit on the WIMP cross-section lower than $10^{-45}$ cm$^{2}$. Here we present a more in-depth discussion of the novel energy scale employed to better understand the nuclear recoil light and charge yields, and of the calibration sources, including the new internal tritium source. We found the LUX data to be in conflict with low-mass WIMP signal interpretations of other results., Comment: 16 pages, 3 figures, to appear in the proceedings of The 10th International Symposium on Cosmology and Particle Astrophysics (CosPA2013); fixed author list and added info on new calibration

Published
2018

73. Kr-83m calibration of the 2013 LUX dark matter search

Author

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, Druszkiewicz, E, Edwards, BN, Fallon, SR, Fan, A, Fiorucci, S, Gaitskell, RJ, 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, Lenardo, BG, Lesko, KT, Lindote, A, Lopes, MI, Manalaysay, A, Mannino, RL, Marzioni, MF, McKinsey, DN, Mei, D-M, Mock, J, Moongweluwan, M, Morad, JA, Murphy, ASJ, Nehrkorn, C, Nelson, HN, Neves, F, O'Sullivan, K, Oliver-Mallory, KC, Palladino, KJ, Pease, EK, 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, Tvrznikova, L, Uvarov, S, Velan, V, Verbus, JR, Webb, RC, White, JT, Whitis, TJ, Witherell, MS, Wolfs, FLH, Xu, J, Yazdani, K, Young, SK, Zhang, C, and Collaboration, LUX

Subjects
physics.ins-det
Abstract

LUX was the first dark matter experiment to use a $^{83\textrm{m}}$Kr calibration source. In this paper we describe the source preparation and injection. We also present several $^{83\textrm{m}}$Kr calibration applications in the context of the 2013 LUX exposure, including the measurement of temporal and spatial variation in scintillation and charge signal amplitudes, and several methods to understand the electric field within the time projection chamber.

Published
2017

74. Low-energy (0.7-74 keV) nuclear recoil calibration of the LUX dark matter experiment using D-D neutron scattering kinematics

Author

Collaboration, LUX, Akerib, DS, Alsum, S, Araújo, HM, Bai, X, Bailey, AJ, Balajthy, J, Beltrame, P, Bernard, EP, Bernstein, A, Biesiadzinski, TP, Whitis, TJ, Witherell, MS, Wolfs, FLH, Xu, J, Yazdani, K, Young, SK, Zhang, C, Boulton, EM, Bradley, A, Bramante, R, Brás, P, Byram, D, Cahn, SB, Carmona-Benitez, MC, Chan, C, Chapman, JJ, Chiller, AA, Chiller, C, Currie, A, Cutter, JE, Davison, TJR, Viveiros, LD, Dobi, A, Dobson, JEY, Druszkiewicz, E, Edwards, BN, Faham, CH, Fiorucci, S, Gaitskell, RJ, Gehman, VM, Ghag, C, Gibson, KR, Gilchriese, MGD, Hall, CR, Hanhardt, M, Haselschwardt, SJ, Hertel, SA, Hogan, DP, Horn, M, Huang, DQ, Ignarra, CM, Ihm, M, Jacobsen, RG, Ji, W, Kamdin, K, Kazkaz, K, Khaitan, D, Knoche, R, Larsen, NA, Lee, C, Lenardo, BG, Lesko, KT, Lindote, A, Lopes, MI, Malling, DC, 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, Pangilinan, M, Pease, EK, Phelps, P, Reichhart, L, Rhyne, CA, Shaw, S, Shutt, TA, Silva, C, Solmaz, M, Solovov, VN, Sorensen, P, Stephenson, S, Sumner, TJ, Szydagis, M, Taylor, DJ, Taylor, WC, Tennyson, BP, Terman, PA, Tiedt, DR, To, WH, Tripathi, M, Tvrznikova, L, Uvarov, S, Verbus, JR, Webb, RC, and White, JT

Subjects
Physics::Instrumentation and Detectors, hep-ex, Astrophysics::Instrumentation and Methods for Astrophysics, Nuclear Experiment, physics.ins-det, astro-ph.IM
Abstract

The Large Underground Xenon (LUX) experiment is a dual-phase liquid xenon time projection chamber (TPC) operating at the Sanford Underground Research Facility in Lead, South Dakota. A calibration of nuclear recoils in liquid xenon was performed $\textit{in situ}$ in the LUX detector using a collimated beam of mono-energetic 2.45 MeV neutrons produced by a deuterium-deuterium (D-D) fusion source. The nuclear recoil energy from the first neutron scatter in the TPC was reconstructed using the measured scattering angle defined by double-scatter neutron events within the active xenon volume. We measured the absolute charge ($Q_{y}$) and light ($L_{y}$) yields at an average electric field of 180 V/cm for nuclear recoil energies spanning 0.7 to 74 keV and 1.1 to 74 keV, respectively. This calibration of the nuclear recoil signal yields will permit the further refinement of liquid xenon nuclear recoil signal models and, importantly for dark matter searches, clearly demonstrates measured ionization and scintillation signals in this medium at recoil energies down to $\mathcal{O}$(1 keV).

Published
2016

75. Pulmonary Sequestration

Author

Savić, B., Birtel, F.-J., Knoche, R., Tholen, W., Schild, H., Frick, P., editor, von Harnack, G.-A., editor, Martini, G. A., editor, Prader, A., editor, Schoen, R., editor, and Wolff, H. P., editor

Published
1979
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76. Results on the Spin-Dependent Scattering of Weakly Interacting Massive Particles on Nucleons from the Run 3 Data of the LUX Experiment

Author

Collaboration, LUX, Akerib, D. S., Araújo, H. M., Bai, X., Bailey, A. J., Balajthy, J., Beltrame, P., Bernard, E. P., Bernstein, A., Biesiadzinski, T. P., Boulton, E. M., Bradley, A., Bramante, R., Cahn, S. B., Carmona-Benitez, M. C., Chan, C., Chapman, J. J., Chiller, A. A., Chiller, C., Currie, A., Cutter, J. E., Davison, T. J. R., Viveiros, L. de, Dobi, A., Dobson, J. E. Y., Druszkiewicz, E., Edwards, B. N., Faham, C. H., Fiorucci, S., Gaitskell, R. J., Gehman, V. M., Ghag, C., Gibson, K. R., Gilchriese, M. G. D., Hall, C. R., Hanhardt, M., Haselschwardt, S. J., Hertel, S. A., Hogan, D. P., Horn, M., Huang, D. Q., Ignarra, C. M., Ihm, M., Jacobsen, R. G., Ji, W., Kazkaz, K., Khaitan, D., Knoche, R., Larsen, N. A., Lee, C., Lenardo, B. G., Lesko, K. T., Lindote, A., Lopes, M. I., Malling, D. C., Manalaysay, A., Mannino, R. L., Marzioni, M. F., McKinsey, D. N., Mei, D. M., Mock, J., Moongweluwan, M., Morad, J. A., Murphy, Alex, Nehrkorn, C., Nelson, H. N., Neves, F., O'Sullivan, K., Oliver-Mallory, K. C., Ott, R. A., Palladino, K. J., Pangilinan, M., Pease, E. K., Phelps, P., Reichhart, L., Rhyne, C., Shaw, S., Shutt, T. A., Silva, C., Solovov, V. N., Sorensen, P., Stephenson, S., Sumner, T. J., Szydagis, M., Taylor, D. J., Taylor, W., Tennyson, B. P., Terman, P. A., Tiedt, D. R., To, W. H., Tripathi, M., Tvrznikova, L., Uvarov, S., Verbus, J. R., Webb, R. C., White, J. T., Whitis, T. J., Witherell, M. S., Wolfs, F. L. H., Yazdani, K., Young, S. K., Zhang, C., Science and Technology Facilities Council (STFC), and The Royal Society

Subjects
General Physics, Physics::Instrumentation and Detectors, Physics, Multidisciplinary, Dark matter, Massive particle, FOS: Physical sciences, General Physics and Astronomy, chemistry.chemical_element, Astrophysics::Cosmology and Extragalactic Astrophysics, 01 natural sciences, 09 Engineering, High Energy Physics - Experiment, LUX Collaboration, Nuclear physics, High Energy Physics - Experiment (hep-ex), High Energy Physics - Phenomenology (hep-ph), Xenon, Recoil, 0103 physical sciences, DARK-MATTER, Nuclear Experiment, 010306 general physics, 01 Mathematical Sciences, Physics, Science & Technology, 02 Physical Sciences, Time projection chamber, 010308 nuclear & particles physics, Scattering, hep-ex, Astrophysics::Instrumentation and Methods for Astrophysics, hep-ph, 3. Good health, High Energy Physics - Phenomenology, chemistry, Weakly interacting massive particles, Physical Sciences, High Energy Physics::Experiment, Nucleon
Abstract

We present the first experimental constraints on the spin-dependent WIMP-nucleon elastic cross sections from LUX data acquired in 2013. LUX is a dual-phase xenon time projection chamber operating at the Sanford Underground Research Facility (Lead, South Dakota), which is designed to observe the recoil signature of galactic WIMPs scattering from xenon nuclei. A profile likelihood ratio analysis of $1.4~\times~10^{4}~\text{kg}\cdot~\text{days}$ of fiducial exposure allows 90% CL upper limits to be set on the WIMP-neutron (WIMP-proton) cross section of $\sigma_n~=~9.4~\times~10^{-41}~\text{cm}^2$ ($\sigma_p~=~2.9~\times~10^{-39}~\text{cm}^2$) at 33 GeV/c$^2$. The spin-dependent WIMP-neutron limit is the most sensitive constraint to date., Comment: 6 pages, 2 figures

Published
2016

77. Tritium calibration of the LUX dark matter experiment

Author

Collaboration, LUX, Akerib, D. S., Araújo, H. M., Bai, X., Bailey, A. J., Balajthy, J., Beltrame, P., Bernard, E. P., Bernstein, A., Biesiadzinski, T. P., Boulton, E. M., Bradley, A., Bramante, R., Cahn, S. B., Carmona-Benitez, M. C., Chan, C., Chapman, J. J., Chiller, A. A., Chiller, C., Currie, A., Cutter, J. E., Davison, T. J. R., Viveiros, L. de, Dobi, A., Dobson, J. E. Y., Druszkiewicz, E., Edwards, B. N., Faham, C. H., Fiorucci, S., Gaitskell, R. J., Gehman, V. M., Ghag, C., Gibson, K. R., Gilchriese, M. G. D., Hall, C. R., Hanhardt, M., Haselschwardt, S. J., Hertel, S. A., Hogan, D. P., Horn, M., Huang, D. Q., Ignarra, C. M., Ihm, M., Jacobsen, R. G., Ji, W., Kazkaz, K., Khaitan, D., Knoche, R., Larsen, N. A., Lee, C., Lenardo, B. G., Lesko, K. T., Lindote, A., Lopes, M. I., Malling, D. C., Manalaysay, A. G., Mannino, R. L., Marzioni, M. F., McKinsey, D. N., Mei, D. M., Mock, J., Moongweluwan, M., Morad, J. A., Murphy, Alex, Nehrkorn, C., Nelson, H. N., Neves, F., O`Sullivan, K., Oliver-Mallory, K. C., Ott, R. A., Palladino, K. J., Pangilinan, M., Pease, E. K., Phelps, P., Reichhart, L., Rhyne, C., Shaw, S., Shutt, T. A., Silva, C., Solovov, V. N., Sorensen, P., Stephenson, S., Sumner, T. J., Szydagis, M., Taylor, D. J., Taylor, W., Tennyson, B. P., Terman, P. A., Tiedt, D. R., To, W. H., Tripathi, M., Tvrznikova, L., Uvarov, S., Verbus, J. R., Webb, R. C., White, J. T., Whitis, T. J., Witherell, M. S., Wolfs, F. L. H., Young, S. K., Zhang, C., Science and Technology Facilities Council (STFC), and The Royal Society

Subjects
Physics - Instrumentation and Detectors, Physics::Instrumentation and Detectors, Dark matter, Massive particle, FOS: Physical sciences, chemistry.chemical_element, Astrophysics::Cosmology and Extragalactic Astrophysics, Astronomy & Astrophysics, GASES, Atomic, 01 natural sciences, High Energy Physics - Experiment, Physics, Particles & Fields, ENERGY, Nuclear physics, High Energy Physics - Experiment (hep-ex), XENON, Particle and Plasma Physics, 0202 Atomic, Molecular, Nuclear, Particle And Plasma Physics, Xenon, 0103 physical sciences, Calibration, PARTICLES, Nuclear, 010306 general physics, Instrumentation and Methods for Astrophysics (astro-ph.IM), 0206 Quantum Physics, physics.ins-det, Physics, Quantum Physics, Science & Technology, hep-ex, 010308 nuclear & particles physics, Detector, Astrophysics::Instrumentation and Methods for Astrophysics, Molecular, Charge (physics), Instrumentation and Detectors (physics.ins-det), Nuclear & Particles Physics, 0201 Astronomical And Space Sciences, chemistry, Physical Sciences, Scintillation counter, Tritium, Astrophysics - Instrumentation and Methods for Astrophysics, DECAY, Astronomical and Space Sciences, astro-ph.IM
Abstract

We present measurements of the electron-recoil (ER) response of the LUX dark matter detector based upon 170 000 highly pure and spatially uniform tritium decays. We reconstruct the tritium energy spectrum using the combined energy model and find good agreement with expectations. We report the average charge and light yields of ER events in liquid xenon at 180 and 105 V/cm and compare the results to the NEST model. We also measure the mean charge recombination fraction and its fluctuations, and we investigate the location and width of the LUX ER band. These results provide input to a reanalysis of the LUX run 3 weakly interacting massive particle search.

Published
2016

78. Direct search for dark matter with two-phase xenon detectors: Current status of LUX and plans for LZ

Author

Akerib, D. S., Araújo, H. M., Bai, X., Bailey, A. J., Balajthy, J., Bernard, E., Bernstein, A., Bradley, A., Byram, D., Cahn, S. B., Carmona-Benitez, M. C., Chan, C., Chapman, J. J., Chiller, A. A., Chiller, C., Coffey, T., Currie, A., Viveiros, L., Dobi, A., Dobson, J., Druszkiewicz, E., Edwards, B., Faham, C. H., Fiorucci, S., Flores, C., Gaitskell, R. J., Gehman, V. M., Ghag, C., Gibson, K. R., Gilchriese, M. G. D., Hall, C., Hertel, S. A., Horn, M., Huang, D. Q., Ihm, M., Jacobsen, R. G., Kazkaz, K., Knoche, R., Larsen, N. A., Lee, C., Lenardo, B., Lesko, K. T., Lindote, A., Lopes, M. I., Malling, D. C., Man-Nino, R., Mckinsey, D. N., Mei, D. -M, Mock, J., Moongweluwan, M., Morad, J., Murphy, A. St J., Nehrkorn, C., Nelson, H., Neves, F., Ott, R. A., Pangilinan, M., Parker, P. D., Pease, E. K., Pech, K., Phelps, P., Reichhart, L., Shutt, T., Claudio Silva, Solovov, V. N., Sorensen, P., O Sullivan, K., Sumner, T. J., Szydagis, M., Tay-Lor, D., Tennyson, B., Tiedt, D. R., Tripathi, M., Uvarov, S., Verbus, J. R., Walsh, N., Webb, R., White, J. T., Witherell, M. S., Wolfs, F. L. H., Woods, M., and Zhang, C.

Abstract

The search for dark matter reaches back generations and remains one of the most compelling endeavors in the hunt for physics beyond the Standard Model. Experiments attempting to directly detect WIMP dark matter have made re-markable progress in increasing sensitivity to elastic scattering of WIMPs on nuclei. The LUX experiment is a 370-kg, two-phase, xenon TPC currently running at SURF, 4850 feet below Lead, SD. LUX recently completed its first science run and was sensitive to spin independent WIMP scattering at cross sections below 10-45 cm2 for WIMP masses of approximately 20 to 80 GeV. Preparations for the final science run of LUX are currently underway, with final results expected in 2015. We will present results from and current status of the LUX experiment, as well as plans for a follow-on, multi-ton-scale xenon experiment at SURF.

Published
2014

79. First Results of the LUX Dark Matter Experiment

Author

Carmona-Benitez, M.C., primary, Akerib, D.S., additional, Araújo, H.M., additional, Bai, X., additional, Bailey, A.J., additional, Balajthy, J., additional, Beltrame, P., additional, Bernard, E., additional, Bernstein, A., additional, Bradley, A., additional, Byram, D., additional, Cahn, S.B., additional, Chan, C., additional, Chapman, J.J., additional, Chiller, A.A., additional, Chiller, C., additional, Currie, A., additional, de Viveiros, L., additional, Dobi, A., additional, Dobson, J., additional, Druszkiewicz, E., additional, Edwards, B., additional, Faham, C.H., additional, Fiorucci, S., additional, Flores, C., additional, Gaitskell, R.J., additional, Gehman, V.M., additional, Ghag, C., additional, Gibson, K.R., additional, Gilchriese, M.G.D., additional, Hall, C., additional, Hanhardt, M., additional, Haselschwardt, S., additional, Hertel, S.A., additional, Horn, M., additional, Huang, D.Q., additional, Ihm, M., additional, Jacobsen, R.G., additional, Kazkaz, K., additional, Knoche, R., additional, Larsen, N.A., additional, Lee, C., additional, Lenardo, B., additional, Lesko, K.T., additional, Lindote, A., additional, Lopes, M.I., additional, Malling, D.C., additional, Manalaysay, A., additional, Mannino, R., additional, McKinsey, D.N., additional, Mei, D.-M., additional, Mock, J., additional, Moongweluwan, M., additional, Morad, J., additional, Murphy, A.St.J., additional, Nehrkorn, C., additional, Nelson, H., additional, Neves, F., additional, Ott, R.A., additional, Pangilinan, M., additional, Parker, P.D., additional, Pease, E.K., additional, Pech, K., additional, Phelps, P., additional, Reichhart, L., additional, Shutt, T., additional, Silva, C., additional, Solovov, V.N., additional, Sorensen, P., additional, O'Sullivan, K., additional, Sumner, T.J., additional, Szydagis, M., additional, Taylor, D., additional, Tennyson, B., additional, Tiedt, D.R., additional, Tripathi, M., additional, Tvrznikova, L., additional, Uvarov, S., additional, Verbus, J.R., additional, Walsh, N., additional, Webb, R., additional, White, J.T., additional, Witherell, M.S., additional, Wolfs, F.L.H., additional, Woods, M., additional, and Zhang, C., additional

Published
2016
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81. Results from the LUX dark matter experiment

Author

Horn, Markus, primary, Akerib, D.S, additional, Araújo, H.M., additional, Bai, X., additional, Bailey, A.J., additional, Balajthy, J., additional, Bernard, E., additional, Bernstein, A., additional, Bradley, A., additional, Byram, D., additional, Cahn, S.B., additional, Carmona-Benitez, M.C., additional, Chan, C., additional, Chapman, J.J., additional, Chiller, A.A., additional, Chiller, C., additional, Currie, A., additional, de Viveiros, L., additional, Dobi, A., additional, Dobson, J., additional, Druszkiewicz, E., additional, Edwards, B., additional, Faham, C.H., additional, Fiorucci, S., additional, Flores, C., additional, Gaitskell, R.J., additional, Gehman, V.M., additional, Ghag, C., additional, Gibson, K.R., additional, Gilchriese, M.G.D., additional, Hall, C., additional, Hanhardt, M., additional, Haselschwardt, S., additional, Hertel, S.A., additional, Huang, D.Q., additional, Ihm, M., additional, Jacobsen, R.G., additional, Kazkaz, K., additional, Knoche, R., additional, Larsen, N.A., additional, Lee, C., additional, Lenardo, B., additional, Lesko, K.T., additional, Lindote, A., additional, Lopes, M.I., additional, Malling, D.C., additional, Mannino, R., additional, McKinsey, D.N., additional, Mei, D.-M., additional, Mock, J., additional, Moongweluwan, M., additional, Morad, J., additional, Murphy, A.St.J., additional, Nehrkorn, C., additional, Nelson, H., additional, Neves, F., additional, Ott, R.A., additional, Pangilinan, M., additional, Parker, P.D., additional, Pease, E.K., additional, Pech, K., additional, Phelps, P., additional, Reichhart, L., additional, Shutt, T., additional, Silva, C., additional, Solovov, V.N., additional, Sorensen, P., additional, O׳Sullivan, K., additional, Sumner, T.J., additional, Szydagis, M., additional, Taylor, D., additional, Tennyson, B., additional, Tiedt, D.R., additional, Tripathi, M., additional, Uvarov, S., additional, Verbus, J.R., additional, Walsh, N., additional, Webb, R., additional, White, J.T., additional, Witherell, M.S., additional, Wolfs, F.L.H., additional, Woods, M., additional, and Zhang, C., additional

Published
2015
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84. Climate variability and change in Sub-Saharan and Northwestern Africa

Author

Kunstmann, H., Jung, G., Laux, P., Wagner, S., Knoche, R., Marx, A., Bardossy, A., Paeth, H., Fink, A., Christoph, M., Born, K., Krüger, A., Diederich, M., Brücher, T., Heuer, K. O., Piecha, K., Ermert, V., Knippertz, P., Schulz, O., Speth, P., Kerschgens, M., and Simmer, C.

Subjects
Earth sciences, ddc:550
Published
2008
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96. A transient calorimeter technique for determining regional heat transfer coefficients in the three-temperature flowfield at a turbine airfoil leading edge

Author

Nowlin, SR, Gillespie, D, Ireland, P, Knoche, R, Kingston, T, and ASME

Subjects
Convection, Leading edge, Engineering, Turbine blade, Internal flow, business.industry, Thermodynamics, Mechanics, Heat transfer coefficient, law.invention, Calorimeter, External flow, Physics::Fluid Dynamics, law, Heat transfer, business
Abstract

In this paper, the authors develop a novel method of obtaining regionally-averaged heat transfer coefficients in flowfields characterized by three temperatures using the well-known transient calorimeter technique. The technique is used to determine heat transfer in aluminum models of idealized turbine blade leading edges cooled through internal surface impingement, film cooling feed passages, and external convective film cooling. The external surface is subject to a stagnating mainstream crossflow. Importantly, the contributions to heating from the external flow and cooling from the internal flow can be separately resolved solely by heating the internal flow. Results for a basic showerhead geometry and an advanced intersecting-passage cooling configuration are presented for a range of internal and external Reynolds numbers. The intersecting-passage model shows little improvement in heat transfer coefficient over the showerhead for the flow conditions tested; however, the total cooling carried out is improved by the increase in exposed surface area. The technique's uncertainties are fully assessed. Copyright © 2005 by ASME.

Published
2005

97. The Large Underground Xenon (LUX) experiment

Author

Akerib, D.S., primary, Bai, X., additional, Bedikian, S., additional, Bernard, E., additional, Bernstein, A., additional, Bolozdynya, A., additional, Bradley, A., additional, Byram, D., additional, Cahn, S.B., additional, Camp, C., additional, Carmona-Benitez, M.C., additional, Carr, D., additional, Chapman, J.J., additional, Chiller, A., additional, Chiller, C., additional, Clark, K., additional, Classen, T., additional, Coffey, T., additional, Curioni, A., additional, Dahl, E., additional, Dazeley, S., additional, de Viveiros, L., additional, Dobi, A., additional, Dragowsky, E., additional, Druszkiewicz, E., additional, Edwards, B., additional, Faham, C.H., additional, Fiorucci, S., additional, Gaitskell, R.J., additional, Gibson, K.R., additional, Gilchriese, M., additional, Hall, C., additional, Hanhardt, M., additional, Holbrook, B., additional, Ihm, M., additional, Jacobsen, R.G., additional, Kastens, L., additional, Kazkaz, K., additional, Knoche, R., additional, Kyre, S., additional, Kwong, J., additional, Lander, R., additional, Larsen, N.A., additional, Lee, C., additional, Leonard, D.S., additional, Lesko, K.T., additional, Lindote, A., additional, Lopes, M.I., additional, Lyashenko, A., additional, Malling, D.C., additional, Mannino, R., additional, Marquez, Z., additional, McKinsey, D.N., additional, Mei, D.-M., additional, Mock, J., additional, Moongweluwan, M., additional, Morii, M., additional, Nelson, H., additional, Neves, F., additional, Nikkel, J.A., additional, Pangilinan, M., additional, Parker, P.D., additional, Pease, E.K., additional, Pech, K., additional, Phelps, P., additional, Rodionov, A., additional, Roberts, P., additional, Shei, A., additional, Shutt, T., additional, Silva, C., additional, Skulski, W., additional, Solovov, V.N., additional, Sofka, C.J., additional, Sorensen, P., additional, Spaans, J., additional, Stiegler, T., additional, Stolp, D., additional, Svoboda, R., additional, Sweany, M., additional, Szydagis, M., additional, Taylor, D., additional, Thomson, J., additional, Tripathi, M., additional, Uvarov, S., additional, Verbus, J.R., additional, Walsh, N., additional, Webb, R., additional, White, D., additional, White, J.T., additional, Whitis, T.J., additional, Wlasenko, M., additional, Wolfs, F.L.H., additional, Woods, M., additional, and Zhang, C., additional

Published
2013
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