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19 results on '"Mock, J"'

1. Chromatographic separation of radioactive noble gases from xenon

Author

Akerib, DS, Araújo, HM, Bai, X, Bailey, AJ, Balajthy, J, Beltrame, P, Bernard, EP, Bernstein, A, Biesiadzinski, TP, Boulton, EM, Bramante, R, Cahn, SB, Carmona-Benitez, MC, Chan, C, Chiller, AA, Chiller, C, Coffey, T, Currie, A, Cutter, JE, Davison, TJR, 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, Manalaysay, A, Mannino, RL, Marzioni, MF, McKinsey, DN, Mei, D-M, Mock, J, Moongweluwan, M, Morad, JA, Murphy, Nehrkorn, C, Nelson, HN, Neves, F, O’Sullivan, K, Oliver-Mallory, KC, Palladino, KJ, Pease, EK, Pech, K, Phelps, P, Reichhart, L, Rhyne, C, Shaw, S, Shutt, TA, Silva, C, Solovov, VN, Sorensen, P, Stephenson, S, Sumner, TJ, Szydagis, M, Taylor, DJ, Taylor, W, Tennyson, BP, Terman, PA, Tiedt, DR, To, WH, Tripathi, M, Tvrznikova, L, Uvarov, S, Verbus, JR, Webb, RC, White, JT, Whitis, TJ, Witherell, MS, Wolfs, FLH, Yazdani, K, Young, SK, and Zhang, C

Subjects
Nuclear and Plasma Physics, Synchrotrons and Accelerators, Physical Sciences, Xenon, Krypton, Adsorption, Chromatography, Gas Separation, Dark Matter, 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

The Large Underground Xenon (LUX) experiment operates at the Sanford Underground Research Facility to detect nuclear recoils from the hypothetical Weakly Interacting Massive Particles (WIMPs) on a liquid xenon target. Liquid xenon typically contains trace amounts of the noble radioactive isotopes 85Kr and 39Ar that are not removed by the in situ gas purification system. The decays of these isotopes at concentrations typical of research-grade xenon would be a dominant background for a WIMP search experiment. To remove these impurities from the liquid xenon, a chromatographic separation system based on adsorption on activated charcoal was built. 400 kg of xenon was processed, reducing the average concentration of krypton from 130 ppb to 3.5 ppt as measured by a cold-trap assisted mass spectroscopy system. A 50 kg batch spiked to 0.001 g/g of krypton was processed twice and reduced to an upper limit of 0.2 ppt.

Published
2018

2. First Results of the LUX Dark Matter Experiment

Author

Carmona-Benitez, MC, Collaboration, LUX, Akerib, DS, Araújo, HM, Bai, X, Bailey, AJ, Balajthy, J, Beltrame, P, Bernard, E, Bernstein, A, Bradley, A, Byram, D, Cahn, SB, 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, 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, Manalaysay, A, Mannino, R, McKinsey, DN, Mei, D-M, Mock, J, Moongweluwan, M, Morad, J, Murphy, 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, Tvrznikova, L, Uvarov, S, Verbus, JR, Walsh, N, Webb, R, White, JT, Witherell, MS, Wolfs, FLH, Woods, M, and Zhang, C

Subjects
Nuclear and Plasma Physics, Particle and High Energy Physics, Physical Sciences, dark matter, WIMP, liquid xenon, time projection chamber
Abstract

LUX (Large Underground Xenon) is a dark matter direct detection experiment deployed at the 4850' level of the Sanford Underground Research Facility (SURF) in Lead, SD, operating a 370 kg dual-phase xenon TPC. Results of the first WIMP search run were presented in late 2013, for the analysis of 85.3 live-days with a fiducial volume of 118 kg, taken during the period of April to August 2013. The experiment exhibited a sensitivity to spin-independent WIMP-nucleon elastic scattering with a minimum upper limit on the cross section of 7.6×10-46cm2 at a WIMP mass of 33 GeV/c2, becoming the world's leading WIMP search result, in conflict with several previous claimed hints of discovery.

Published
2016

3. Results from the LUX dark matter experiment

Author

Horn, Markus, 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, 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, D-M, Mock, J, Moongweluwan, M, Morad, J, Murphy, 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, Zhang, C, and Collaboration, On behalf of the LUX

Subjects
Nuclear and Plasma Physics, Particle and High Energy Physics, Synchrotrons and Accelerators, Physical Sciences, Dark matter, WIMP, Liquid xenon, Time projection chamber, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Other Physical Sciences, Nuclear & Particles Physics, Nuclear and plasma physics
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
2015

4. Radiogenic and muon-induced backgrounds in the LUX dark matter detector

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, Lindote, A, Lopes, MI, Malling, DC, Mannino, R, McKinsey, DN, Mei, D-M, Mock, J, Moongweluwan, M, Morad, J, Murphy, 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
Nuclear and Plasma Physics, Particle and High Energy Physics, Physical Sciences, LUX, Dark matter, Radioactive background, Material screening, Simulation, astro-ph.IM, 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

The Large Underground Xenon (LUX) dark matter experiment aims to detect rare low-energy interactions from Weakly Interacting Massive Particles (WIMPs). The radiogenic backgrounds in the LUX detector have been measured and compared with Monte Carlo simulation. Measurements of LUX high-energy data have provided direct constraints on all background sources contributing to the background model. The expected background rate from the background model for the 85.3 day WIMP search run is (2.6±0.2stat±0.4sys) ×10-3 events keVee-1kg-1day-1 in a 118 kg fiducial volume. The observed background rate is (3.6±0.4 stat)×10-3 events keVee-1kg-1day- 1, consistent with model projections. The expectation for the radiogenic background in a subsequent one-year run is presented. © 2014 Elsevier B.V. All rights reserved.

Published
2015

5. Radon-related Backgrounds in the LUX Dark Matter Search

Author

Bradley, A, Akerib, DS, Araújo, HM, Bai, X, Bailey, AJ, Balajthy, J, Bernard, E, Bernstein, 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, 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, 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, liquid noble detectors, xenon, radon, background characterization
Abstract

The LUX detector is currently in operation at the Davis Campus at the 4850' level of the Sanford Underground Research Facility (SURF) in Lead, SD to directly search for WIMP dark matter. Knowing the type and rate of backgrounds is critical in a rare, low energy event search, and LUX was designed, constructed, and deployed to mitigate backgrounds, both internal and external. An important internal background are decays of radon and its daughters. These consist of alpha decays, which are easily tagged and are a tracer of certain backgrounds, and beta decays, some of which are not as readily tagged and present a background for the WIMP search. We report on studies of alpha decay and discuss implications for the WIMP search.

Published
2015

6. The LUX Experiment

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, 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, 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
Liquid xenon detectors, Dark matter, WIMP, Direct detection
Abstract

We present the status and prospects of the LUX experiment, which employs approximately 300 kg of two-phase xenon to search for WIMP dark matter interactions. The LUX detector was commissioned at the surface laboratory of the Sanford Underground Research Facility in Lead, SD, between December 2011 and February 2012 and the detector has been operating underground since January, 2013. These proceedings review the results of the commissioning run as well as the status of underground data-taking through the summer of 2013.

Published
2015

7. 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

8. 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

9. LUXSim: A component-centric approach to low-background simulations

Author

Akerib, DS, Bai, X, Bedikian, S, Bernard, E, Bernstein, A, Bradley, A, Cahn, SB, Carmona-Benitez, MC, Carr, D, Chapman, JJ, Clark, K, Classen, T, Coffey, T, Dazeley, S, De Viveiros, L, Dobi, A, Dragowsky, M, Druszkiewicz, E, Faham, CH, Fiorucci, S, Gaitskell, RJ, Gibson, KR, Hall, C, Hanhardt, M, Holbrook, B, Ihm, M, Jacobsen, RG, Kastens, L, Kazkaz, K, Lander, R, Larsen, N, Lee, C, Leonard, D, Lesko, K, Lyashenko, A, Malling, DC, Mannino, R, McKinsey, DN, Mei, DM, Mock, J, Morii, M, Nelson, H, Nikkel, JA, Pangilinan, M, Parker, PD, Phelps, P, Shutt, T, Skulski, W, Sorensen, P, Spaans, J, Stiegler, T, Svoboda, R, Sweany, M, Szydagis, M, Thomson, J, Tripathi, M, Verbus, JR, Walsh, N, Webb, R, White, JT, Wlasenko, M, Wolfs, FLH, Woods, M, and Zhang, C

Subjects
Simulation, Low-background, Dark matter, Underground, Geant4, physics.data-an, hep-ex, nucl-ex, Nuclear & Particles Physics, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Other Physical Sciences
Abstract

Geant4 has been used throughout the nuclear and high-energy physics community to simulate energy depositions in various detectors and materials. These simulations have mostly been run with a source beam outside the detector. In the case of low-background physics, however, a primary concern is the effect on the detector from radioactivity inherent in the detector parts themselves. From this standpoint, there is no single source or beam, but rather a collection of sources with potentially complicated spatial extent. LUXSim is a simulation framework used by the LUX collaboration that takes a component-centric approach to event generation and recording. A new set of classes allows for multiple radioactive sources to be set within any number of components at run time, with the entire collection of sources handled within a single simulation run. Various levels of information can also be recorded from the individual components, with these record levels also being set at run time. This flexibility in both source generation and information recording is possible without the need to recompile, reducing the complexity of code management and the proliferation of versions. Within the code itself, casting geometry objects within this new set of classes rather than as the default Geant4 classes automatically extends this flexibility to every individual component. No additional work is required on the part of the developer, reducing development time and increasing confidence in the results. We describe the guiding principles behind LUXSim, detail some of its unique classes and methods, and give examples of usage. © 2012 Elsevier B.V. All rights reserved.

Published
2012

10. Status of the LUX Dark Matter Search

Author

Fiorucci, S, Akerib, DS, Bedikian, S, Bernstein, A, Bolozdynya, A, Bradley, A, Carr, D, Chapman, J, Clark, K, Classen, T, Curioni, A, Dahl, E, Dazeley, S, de Viveiros, L, Druszkiewicz, E, Gaitskell, R, Hall, C, Hernandez Faham, C, Holbrook, B, Kastens, L, Kazkaz, K, Lander, R, Lesko, K, Malling, D, Mannino, R, McKinsey, D, Mei, D, Mock, J, Nikkel, J, Phelps, P, Schroeder, U, Shutt, T, Skulski, W, Sorensen, P, Spaans, J, Stiegler, T, Svoboda, R, Sweany, M, Thomson, J, Toke, J, Tripathi, M, Walsh, N, Webb, R, White, J, Wolfs, F, Woods, M, Zhang, C, Alverson, George, Nath, Pran, and Nelson, Brent

Subjects
Nuclear and Plasma Physics, Particle and High Energy Physics, Physical Sciences, Dark Matter, LUX, astro-ph.CO, astro-ph.IM
Abstract

The Large Underground Xenon (LUX) dark matter search experiment is currently being deployed at the Homestake Laboratory in South Dakota. We will highlight the main elements of design which make the experiment a very strong competitor in the field of direct detection, as well as an easily scalable concept. We will also present its potential reach for supersymmetric dark matter detection, within various timeframes ranging from 1 year to 5 years or more. © 2010 American Institute of Physics.

Published
2010

11. Status of the LUX dark matter search

Author

Fiorucci, S, Akerib, DS, Bedikian, S, Bernstein, A, Bolozdynya, A, Bradley, A, Carr, D, Chapman, J, Clark, K, Classen, T, Curioni, A, Dahl, E, Dazeley, S, De Viveiros, L, Druszkiewicz, E, Gaitskell, R, Hall, C, Hernandez Faham, C, Holbrook, B, Kastens, L, Kazkaz, K, Lander, R, Lesko, K, Malling, D, Mannino, R, McKinsey, D, Mei, D, Mock, J, Nikkel, J, Phelps, P, Schroeder, U, Shutt, T, Skulski, W, Sorensen, P, Spaans, J, Stiegler, T, Svoboda, R, Sweany, M, Thomson, J, Toke, J, Tripathi, M, Walsh, N, Webb, R, White, J, Wolfs, F, Woods, M, and Zhang, C

Subjects
Dark Matter, LUX, astro-ph.CO, astro-ph.IM
Abstract

The Large Underground Xenon (LUX) dark matter search experiment is currently being deployed at the Homestake Laboratory in South Dakota. We will highlight the main elements of design which make the experiment a very strong competitor in the field of direct detection, as well as an easily scalable concept. We will also present its potential reach for supersymmetric dark matter detection, within various timeframes ranging from 1 year to 5 years or more. © 2010 American Institute of Physics.

Published
2009

12. 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

13. Liquid xenon scintillation measurements and pulse shape discrimination in the LUX dark matter detector

Author

The LUX Collaboration, Akerib, D. S., Alsum, S., Araújo, H. M., Bai, X., Bailey, A. J., Balajthy, J., Beltrame, P., Bernard, E. P., Bernstein, A., Biesiadzinski, T. P., Boulton, E. M., Brás, P., Byram, D., Carmona-Benitez, M. C., Chan, C., Currie, A., Cutter, J. E., Davison, T. J. R., Dobi, A., Druszkiewicz, E., Edwards, B. N., Fallon, S. R., Fan, A., Fiorucci, S., Gaitskell, R. J., Genovesi, J., Ghag, C., Gilchriese, M. G. D., Hall, C. R., Haselschwardt, S. J., Hertel, S. A., Hogan, D. P., Horn, M., Huang, D. Q., Ignarra, C. M., Jacobsen, R. G., Ji, W., Kamdin, K., Kazkaz, K., Khaitan, D., Knoche, R., Lenardo, B. G., Lesko, K. T., Liao, J., 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., Rhyne, C., Shaw, S., Shutt, T. A., Silva, C., Solmaz, M., Solovov, V. N., Sorensen, P., Sumner, T. J., Szydagis, M., Taylor, D. J., Taylor, W. C., Tennyson, B. P., Terman, P. A., Tiedt, D. R., To, W. H., Tripathi, M., Tvrznikova, L., Utku, U., Uvarov, S., Velan, V., Verbus, J. R., Webb, R. C., White, J. T., Whitis, T. J., Witherell, M. S., Wolfs, F. L. H., Xu, J., Yazdani, K., Young, S. K., and Zhang, C.

Subjects
Physics - Instrumentation and Detectors, ARGON, Physics::Instrumentation and Detectors, Dark matter, FOS: Physical sciences, chemistry.chemical_element, XMASS, NUCLEAR, Astrophysics::Cosmology and Extragalactic Astrophysics, Astronomy & Astrophysics, RECOILS, 01 natural sciences, Atomic, Particle detector, Particle identification, Physics, Particles & Fields, Nuclear physics, LIMITS, Recoil, Xenon, Particle and Plasma Physics, SEARCH, 0103 physical sciences, Nuclear, 010306 general physics, physics.ins-det, Physics, Scintillation, Quantum Physics, Science & Technology, 010308 nuclear & particles physics, GAMMA-RAYS, Molecular, Instrumentation and Detectors (physics.ins-det), Nuclear & Particles Physics, KRYPTON, chemistry, Weakly interacting massive particles, Physical Sciences, Scintillation counter, Astronomical and Space Sciences
Abstract

Weakly Interacting Massive Particles (WIMPs) are a leading candidate for dark matter and are expected to produce nuclear recoil (NR) events within liquid xenon time-projection chambers. We present a measurement of the scintillation timing characteristics of liquid xenon in the LUX dark matter detector and develop a pulse shape discriminant to be used for particle identification. To accurately measure the timing characteristics, we develop a template-fitting method to reconstruct the detection times of photons. Analyzing calibration data collected during the 2013-16 LUX WIMP search, we provide a new measurement of the singlet-to-triplet scintillation ratio for electron recoils (ER) below 46~keV, and we make a first-ever measurement of the NR singlet-to-triplet ratio at recoil energies below 74~keV. We exploit the difference of the photon time spectra for NR and ER events by using a prompt fraction discrimination parameter, which is optimized using calibration data to have the least number of ER events that occur in a 50\% NR acceptance region. We then demonstrate how this discriminant can be used in conjunction with the charge-to-light discrimination to possibly improve the signal-to-noise ratio for nuclear recoils., 16 pages, 11 figures

Published
2018

14. 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

15. 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

16. First results from the LUX dark matter experiment at the Sanford Underground Research Facility

Author

LUX Collaboration, Akerib, D. S., Araujo, H. M., Bai, X., Bailey, A. J., Balajthy, J., Bedikian, S., Bernard, E., Bernstein, A., Bolozdynya, A., Bradley, A., Byram, D., Cahn, S. B., Carmona-Benitez, M. C., Chan, C., Chapman, J. J., Chiller, A. A., Chiller, C., Clark, K., Coffey, T., Currie, A., Curioni, A., Dazeley, S., de Viveiros, L., Dobi, A., Dobson, J., Dragowsky, E. M., 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., Hertel, S. A., Horn, M., Huang, D. Q., Ihm, M., Jacobsen, R. G., Kastens, L., Kazkaz, K., Knoche, R., Kyre, S., Lander, R., Larsen, N. A., Lee, C., Leonard, D. S., Lesko, K. T., Lindote, A., Lopes, M. I., Lyashenko, A., Malling, D. C., Mannino, R., McKinsey, D. N., Mei, D. -M., Mock, J., Moongweluwan, M., Morad, J., Morii, M., Murphy, A. St. J., Nehrkorn, C., Nelson, H., Neves, F., Nikkel, J. A., Ott, R. A., Pangilinan, M., Parker, P. D., Pease, E. K., Pech, K., Phelps, P., Reichhart, L., Shutt, T., Silva, C., Skulski, W., Sofka, C. J., Solovov, V. N., Sorensen, P., Stiegler, T., O`Sullivan, K., Sumner, T. J., Svoboda, R., Sweany, M., Szydagis, M., Taylor, D., Tennyson, B., Tiedt, D. R., Tripathi, M., Uvarov, S., Verbus, J. R., Walsh, N., Webb, R., White, J. T., White, D., Witherell, M. S., Wlasenko, M., Wolfs, F. L. H., Woods, M., and Zhang, C.

Subjects
Physics, Cosmology and Nongalactic Astrophysics (astro-ph.CO), Large Underground Xenon experiment, Physics - Instrumentation and Detectors, 010308 nuclear & particles physics, Dark matter, FOS: Physical sciences, General Physics and Astronomy, chemistry.chemical_element, Instrumentation and Detectors (physics.ins-det), 01 natural sciences, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), Xenon, WIMP, chemistry, Weakly interacting massive particles, 0103 physical sciences, Underground laboratory, PandaX, 010306 general physics, Astrophysics - Instrumentation and Methods for Astrophysics, Instrumentation and Methods for Astrophysics (astro-ph.IM), Astrophysics - Cosmology and Nongalactic Astrophysics
Abstract

The Large Underground Xenon (LUX) experiment, a dual-phase xenon time-projection chamber operating at the Sanford Underground Research Facility (Lead, South Dakota), was cooled and filled in February 2013. We report results of the first WIMP search dataset, taken during the period 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 $7.6 \times 10^{-46}$ cm$^{2}$ at a WIMP mass of 33 GeV/c$^2$. We find that the LUX data are in strong disagreement with low-mass WIMP signal interpretations of the results from several recent direct detection experiments., Accepted by Phys. Rev. Lett. Appendix A included as supplementary material with PRL article

Published
2013

17. 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
Physics - Instrumentation and Detectors, Large Underground Xenon experiment, Cold dark matter, WIMP, Physics::Instrumentation and Detectors, Direct detection, Dark matter, FOS: Physical sciences, chemistry.chemical_element, 01 natural sciences, 7. Clean energy, Atomic, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), High Energy Physics - Phenomenology (hep-ph), Xenon, Particle and Plasma Physics, 0103 physical sciences, Nuclear, Liquid xenon detectors, 010306 general physics, Instrumentation and Methods for Astrophysics (astro-ph.IM), physics.ins-det, Physics, 010308 nuclear & particles physics, hep-ex, Detector, Astrophysics::Instrumentation and Methods for Astrophysics, Molecular, Astronomy and Astrophysics, hep-ph, Instrumentation and Detectors (physics.ins-det), Nuclear & Particles Physics, High Energy Physics - Phenomenology, chemistry, Weakly interacting massive particles, Cryogenic Dark Matter Search, Astrophysics - Instrumentation and Methods for Astrophysics, Astronomical and Space Sciences, astro-ph.IM
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
2012

18. An Ultra-Low Background PMT for Liquid Xenon Detectors

Author

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

Subjects
Nuclear and High Energy Physics, Photomultiplier, Physics - Instrumentation and Detectors, Monte Carlo method, Dark matter, chemistry.chemical_element, FOS: Physical sciences, Electron, 01 natural sciences, 7. Clean energy, Atomic, Photocathode, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), Recoil, Xenon, Particle and Plasma Physics, 0103 physical sciences, Nuclear, Liquid xenon detectors, 010306 general physics, Instrumentation, Instrumentation and Methods for Astrophysics (astro-ph.IM), physics.ins-det, Physics, 010308 nuclear & particles physics, hep-ex, Detector, Molecular, Instrumentation and Detectors (physics.ins-det), PMT, Nuclear & Particles Physics, Other Physical Sciences, Radioactivity, chemistry, Astrophysics - Instrumentation and Methods for Astrophysics, Astronomical and Space Sciences, astro-ph.IM
Abstract

Results are presented from radioactivity screening of two models of photomultiplier tubes designed for use in current and future liquid xenon experiments. The Hamamatsu 5.6 cm diameter R8778 PMT, used in the LUX dark matter experiment, has yielded a positive detection of four common radioactive isotopes: 238U, 232Th, 40K, and 60Co. Screening of LUX materials has rendered backgrounds from other detector materials subdominant to the R8778 contribution. A prototype Hamamatsu 7.6 cm diameter R11410 MOD PMT has also been screened, with benchmark isotope counts measured at, v2 updated to include content after reviewer comments (Sep 2012)

Published
2012

19. Improved Limits on Scattering of Weakly Interacting Massive Particles from Reanalysis of 2013 LUX Data

Author

LUX Collaboration, Akerib, D. S., Ara��jo, 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., 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., 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
Physics - Instrumentation and Detectors, Physics::Instrumentation and Detectors, General Physics and Astronomy, Astrophysics, 7. Clean energy, 01 natural sciences, 09 Engineering, High Energy Physics - Experiment, LUX Collaboration, ENERGY, XENON, High Energy Physics - Experiment (hep-ex), Xenon, WIMP, LIQUID ARGON, physics.ins-det, Physics, 02 Physical Sciences, Astrophysics::Instrumentation and Methods for Astrophysics, Instrumentation and Detectors (physics.ins-det), Physical Sciences, astro-ph.CO, Astrophysics - Instrumentation and Methods for Astrophysics, Astrophysics - Cosmology and Nongalactic Astrophysics, General Physics, Cosmology and Nongalactic Astrophysics (astro-ph.CO), Physics, Multidisciplinary, Dark matter, chemistry.chemical_element, FOS: Physical sciences, Astrophysics::Cosmology and Extragalactic Astrophysics, Nuclear physics, 0103 physical sciences, DARK-MATTER, Sensitivity (control systems), 010306 general physics, Instrumentation and Methods for Astrophysics (astro-ph.IM), 01 Mathematical Sciences, Scintillation, Science & Technology, hep-ex, 010308 nuclear & particles physics, Scattering, Dark matter halo, chemistry, High Energy Physics::Experiment, SCINTILLATION, Energy (signal processing), astro-ph.IM
Abstract

We present constraints on weakly interacting massive particles (WIMP)-nucleus scattering from the 2013 data of the Large Underground Xenon dark matter experiment, including $1.4\times10^{4}\;\mathrm{kg\; day}$ of search exposure. This new analysis incorporates several advances: single-photon calibration at the scintillation wavelength, improved event-reconstruction algorithms, a revised background model including events originating on the detector walls in an enlarged fiducial volume, and new calibrations from decays of an injected tritium $\beta$ source and from kinematically constrained nuclear recoils down to 1.1 keV. Sensitivity, especially to low-mass WIMPs, is enhanced compared to our previous results which modeled the signal only above a 3 keV minimum energy. Under standard dark matter halo assumptions and in the mass range above 4 $\mathrm{GeV}\,c^{-2}$, these new results give the most stringent direct limits on the spin-independent WIMP-nucleon cross section. The 90% C.L. upper limit has a minimum of 0.6 zb at 33 $\mathrm{GeV}\,c^{-2}$ WIMP mass., Comment: Accepted by Phys. Rev. Lett

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