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9 results on '"Pech, K"'

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. Results from the LUX dark matter experiment

Author

Horn, M, 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, 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
Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Other Physical Sciences, Nuclear & Particles Physics, Nuclear and plasma physics
Abstract

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

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. 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

6. 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

7. 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

8. 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
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9. 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
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