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1. The EXO-200 detector, part II: Auxiliary Systems

Author: Ackerman, N., Albert, J., Auger, M., Auty, D. J., Badhrees, I., Barbeau, P. S., Bartoszek, L., Baussan, E., Belov, V., Benitez-Medina, C., Bhatta, T., Breidenbach, M., Brunner, T., Cao, G. F., Cen, W. R., Chambers, C., Cleveland, B., Conley, R., Cook, S., Coon, M., Craddock, W., Craycraft, A., Cree, W., Daniels, T., Darroch, L., Daugherty, S. J., Daughhetee, J., Davis, C. G., Davis, J., Delaquis, S., Der Mesrobian-Kabakian, A., deVoe, R., Didberidze, T., Dilling, J., Dobi, A., Dolgolenko, A. G., Dolinski, M. J., Dunford, M., Echevers, J., Espic, L., Fairbank Jr., W., Fairbank, D., Farine, J., Feldmeier, W., Feyzbakhsh, S., Fierlinger, P., Fouts, K., Franco, D., Freytag, D., Fudenberg, D., Gautam, P., Giroux, G., Gornea, R., Graham, K., Gratta, G., Hagemann, C., Hall, C., Hall, K., Haller, G., Hansen, E. V., Hargrove, C., Herbst, R., Herrin, S., Hodgson, J., Hughes, M., Iverson, A., Jamil, A., Jessiman, C., Jewell, M. J., Johnson, A., Johnson, T. N., Johnston, S., Karelin, A., Kaufman, L. J., Killick, R., Koffas, T., Kravitz, S., Krücken, R., Kuchenkov, A., Kumar, K. S., Lan, Y., Larson, A., Leonard, D. S., Leonard, F., LePort, F., Li, G. S., Li, S., Li, Z., Licciardi, C., Lin, Y. H., Mackay, D., MacLellan, R., Marino, M., Martin, J. -M., Martin, Y., McElroy, T., McFarlane, K., Michel, T., Mong, B., Moore, D. C., Murray, K., Neilson, R., Njoya, O., Nusair, O., O'Sullivan, K., Odian, A., Ostrovskiy, I., Ouellet, C., Piepke, A., Pocar, A., Prescott, C. Y., Pushkin, K., Retiere, F., Rivas, A., Robinson, A. L., Rollin, E., Rowson, P. C., Rozo, M. P., Runge, J., Russell, J. J., Schmidt, S., Schubert, A., Sinclair, D., Skarpaas, K., Slutsky, S., Smith, E., Soma, A. K., Stekhanov, V., Strickland, V., Swift, M., Tarka, M., Todd, J., Tolba, T., Tosi, D., Totev, T. I., Tsang, R., Twelker, K., Veenstra, B., Veeraraghavan, V., Vuilleumier, J. -L., Vuilleumier, J. -M., Wagenpfeil, M., Waite, A., Walton, J., Walton, T., Wamba, K., Watkins, J., Weber, M., Wen, L. J., Wichoski, U., Wittgen, M., Wodin, J., Wood, J., Wrede, G., Wu, S. X., Xia, Q., Yang, L., Yen, Y. -R., Zeldovich, O. Ya, and Ziegler, T.
Subjects: Physics - Instrumentation and Detectors, High Energy Physics - Experiment, Nuclear Experiment
Abstract: The EXO-200 experiment searched for neutrinoless double-beta decay of $^{136}$Xe with a single-phase liquid xenon detector. It used an active mass of 110 kg of 80.6%-enriched liquid xenon in an ultra-low background time projection chamber with ionization and scintillation detection and readout. This paper describes the design and performance of the various support systems necessary for detector operation, including cryogenics, xenon handling, and controls. Novel features of the system were driven by the need to protect the thin-walled detector chamber containing the liquid xenon, to achieve high chemical purity of the Xe, and to maintain thermal uniformity across the detector., Comment: Manuscript updated in response to JINST reviewer comments
Published: 2021
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2. GEANT4 models of HPGe detectors for radioassay

Author: Tsang, R. H. M., Piepke, A., Auty, D. J., Cleveland, B., Delaquis, S., Didberidze, T., MacLellan, R., Meng, Y., Nusair, O., and Tolba, T.
Subjects: Physics - Instrumentation and Detectors
Abstract: Radiation transport models of two high purity germanium detectors, GeII and GeIII, located at the University of Alabama have been created in GEANT4 \cite{geant4}. These detectors have been used extensively for radioassay measurements of materials used in various low background experiments. The two models have been validated against actual data under several scenarios typically seen in radioassay measurements. The systematic uncertainties of the models for GeII and GeIII are estimated to be $\sim$12\% and $\sim$9\% respectively., Comment: 24 pages
Published: 2019
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3. VUV-sensitive Silicon Photomultipliers for Xenon Scintillation Light Detection in nEXO

Author: Jamil, A., Ziegler, T., Hufschmidt, P., Li, G., Lupin-Jimenez, L., Michel, T., Ostrovskiy, I., Retière, F., Schneider, J., Wagenpfeil, M., Albert, J. B., Anton, G., Arnquist, I. J., Badhrees, I., Barbeau, P., Beck, D., Belov, V., Brodsky, J. P., Brown, E., Brunner, T., Burenkov, A., Cao, G. F., Cao, L., Cen, W. R., Chambers, C., Charlebois, S. A., Chiu, M., Cleveland, B., Coon, M., Craycraft, A., Cree, W., Côté, M., Dalmasson, J., Daniels, T., Daugherty, S. J., Daughhetee, J., Delaquis, S., Der Mesrobian-Kabakian, A., DeVoe, R., Didberidze, T., Dilling, J., Ding, Y. Y., Dolinski, M. J., Dragone, A., Echevers, J., Fabris, L., Fairbank, D., Fairbank, W., Farine, J., Feyzbakhsh, S., Fontaine, R., Fudenberg, D., Gallina, G., Giacomini, G., Gornea, R., Gratta, G., Hansen, E. V., Harris, D., Hasan, M., Heffner, M., Hoppe, E. W., House, A., Hughes, M., Hößl, J., Ito, Y., Iverson, A., Jewell, M., Jiang, X. S., Karelin, A., Kaufman, L. J., Koffas, T., Kravitz, S., Krücken, R., Kuchenkov, A., Kumar, K. S., Lan, Y., Leonard, D. S., Li, S., Li, Z., Licciardi, C., Lin, Y. H., MacLellan, R., Mong, B., Moore, D., Murray, K., Newby, R. J., Ning, Z., Njoya, O., Nolet, F., Odgers, K., Odian, A., Oriunno, M., Orrell, J. L., Overman, C. T., Ortega, G. S., Parent, S., Piepke, A., Pocar, A., Pratte, J. -F., Qiu, D., Radeka, V., Raguzin, E., Rao, T., Rescia, S., Robinson, A., Rossignol, T., Rowson, P. C., Roy, N., Saldanha, R., Sangiorgio, S., Schmidt, S., Schubert, A., Sinclair, D., Skarpaas, K., Soma, A. K., St-Hilaire, G., Stekhanov, V., Stiegler, T., Sun, X. L., Tarka, M., Todd, J., Tolba, T., Tsang, R., Tsang, T., Vachon, F., Veeraraghavan, V., Visser, G., Vuilleumier, J. -L., Wang, Q., Weber, M., Wei, W., Wen, L. J., Wichoski, U., Wrede, G., Wu, S. X., Wu, W. H., Xia, Q., Yang, L., Yen, Y. -R., Zeldovich, O., Zhang, X., Zhao, J., and Zhou, Y.
Subjects: Physics - Instrumentation and Detectors
Abstract: Future tonne-scale liquefied noble gas detectors depend on efficient light detection in the VUV range. In the past years Silicon Photomultipliers (SiPMs) have emerged as a valid alternative to standard photomultiplier tubes or large area avalanche photodiodes. The next generation double beta decay experiment, nEXO, with a 5 tonne liquid xenon time projection chamber, will use SiPMs for detecting the $178\,\text{nm}$ xenon scintillation light, in order to achieve an energy resolution of $\sigma / Q_{\beta\beta} = 1\, \%$. This paper presents recent measurements of the VUV-HD generation SiPMs from Fondazione Bruno Kessler in two complementary setups. It includes measurements of the photon detection efficiency with gaseous xenon scintillation light in a vacuum setup and dark measurements in a dry nitrogen gas setup. We report improved photon detection efficiency at $175\,\text{nm}$ compared to previous generation devices, that would meet the criteria of nEXO. Furthermore, we present the projected nEXO detector light collection and energy resolution that could be achieved by using these SiPMs., Comment: 11 pages, 13 figures, 2 tables
Published: 2018
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4. Search for nucleon decays with EXO-200

Author: Albert, J. B., Anton, G., Badhrees, I., Barbeau, P. S., Bayerlein, R., Beck, D., Belov, V., Breidenbach, M., Brunner, T., Cao, G. F., Cen, W. R., Chambers, C., Cleveland, B., Coon, M., Craycraft, A., Cree, W., Daniels, T., Danilov, M., Daugherty, S. J., Daughhetee, J., Davis, J., Delaquis, S., Der Mesrobian-Kabakian, A., DeVoe, R., Didberidze, T., Dilling, J., Dolgolenko, A., Dolinski, M. J., Fairbank Jr., W., Farine, J., Feyzbakhsh, S., Fierlinger, P., Fudenberg, D., Gornea, R., Graham, K., Gratta, G., Hall, C., Hansen, E. V., Hoessl, J., Homiller, S., Hufschmidt, P., Hughes, M., Jamil, A., Jewell, M. J., Johnson, A., Johnston, S., Karelin, A., Kaufman, L. J., Koffas, T., Kravitz, S., Krücken, R., Kuchenkov, A., Kumar, K. S., Lan, Y., Leonard, D. S., Li, G. S., Li, S., Licciardi, C., Lin, Y. H., MacLellan, R., Michel, T., Mong, B., Moore, D., Murray, K., Nelson, R., Njoya, O., Odian, A., Ostrovskiy, I., Piepke, A., Pocar, A., Retière, F., Robinson, A. L., Rowson, P. C., Schmidt, S., Schubert, A., Sinclair, D., Soma, A. K., Stekhanov, V., Tarka, M., Tolba, T., Tsang, R., Vogel, P., Vuilleumier, J. -L., Wagenpfeil, M., Waite, A., Walton, T., Weber, M., Wen, L. J., Wichoski, U., Wrede, G., Yang, L., Yen, Y. -R., Zeldovich, O. Ya., Zettlemoyer, J., and Ziegler, T.
Subjects: High Energy Physics - Experiment, Nuclear Experiment, Physics - Instrumentation and Detectors
Abstract: A search for instability of nucleons bound in $^{136}$Xe nuclei is reported with 223 kg$\cdot$yr exposure of $^{136}$Xe in the EXO-200 experiment. Lifetime limits of 3.3$\times 10^{23}$ and 1.9$\times 10^{23}$ yrs are established for nucleon decay to $^{133}$Sb and $^{133}$Te, respectively. These are the most stringent to date, exceeding the prior decay limits by a factor of 9 and 7, respectively.
Published: 2017
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5. Sensitivity and discovery potential of the proposed nEXO experiment to neutrinoless double beta decay

Author: nEXO Collaboration, Albert, J. B., Anton, G., Arnquist, I. J., Badhrees, I., Barbeau, P. S., Beck, D., Belov, V., Bourque, F., Brodsky, J. P., Brown, E., Brunner, T., Burenkov, A., Cao, G. F., Cao, L., Cen, W. R., Chambers, C., Charlebois, S. A., Chiu, M., Cleveland, B., Coon, M., Côté, M., Craycraft, A., Cree, W., Dalmasson, J., Daniels, T., Daugherty, S. J., Daughhetee, J., DeVoe, R., Delaquis, S., Der Mesrobian-Kabakian, A., Didberidze, T., Dilling, J., Ding, Y. Y., Dolinski, M. J., Dragone, A., Fabris, L., Fairbank, W., Farine, J., Feyzbakhsh, S., Fontaine, R., Fudenberg, D., Giacomini, G., Gornea, R., Graham, K., Gratta, G., Hansen, E. V., Harris, D., Hasan, M., Heffner, M., Hoppe, E. W., Hößl, J., House, A., Hufschmidt, P., Hughes, M., Ito, Y., Iverson, A., Jamil, A., Jewell, M. J., Jiang, X. S., Johnson, T. N., Johnston, S., Karelin, A., Kaufman, L. J., Killick, R., Koffas, T., Kravitz, S., Krücken, R., Kuchenkov, A., Kumar, K. S., Lan, Y., Leonard, D. S., Li, G., Li, S., Li, Z., Licciardi, C., Lin, Y. H., MacLellan, R., Michel, T., Mong, B., Moore, D. C., Murray, K., Newby, R. J., Ning, Z., Njoya, O., Nolet, F., Odgers, K., Odian, A., Oriunno, M., Orrell, J. L., Ortega, G. S., Ostrovskiy, I., Overman, C. T., Parent, S., Piepke, A., Pocar, A., Pratte, J. -F., Qiu, D., Radeka, V., Raguzin, E., Rao, T., Rescia, S., Retière, F., Robinson, A., Rossignol, T., Rowson, P. C., Roy, N., Saldanha, R., Sangiorgio, S., Schmidt, S., Schneider, J., Schubert, A., Sinclair, D., VIII, K. Skarpaas, Soma, A. K., St-Hilaire, G., Stekhanov, V., Stiegler, T., Sun, X. L., Tarka, M., Todd, J., Tolba, T., Tsang, R., Tsang, T., Vachon, F., Veeraraghavan, V., Visser, G., Vogel, P., Vuilleumier, J. -L., Wagenpfeil, M., Wang, Q., Weber, M., Wei, W., Wen, L. J., Wichoski, U., Wrede, G., Wu, S. X., Wu, W. H., Yang, L., Yen, Y. -R., Zeldovich, O., Zettlemoyer, J., Zhang, X., Zhao, J., Zhou, Y., and Ziegler, T.
Subjects: Nuclear Experiment, Physics - Instrumentation and Detectors
Abstract: The next-generation Enriched Xenon Observatory (nEXO) is a proposed experiment to search for neutrinoless double beta ($0\nu\beta\beta$) decay in $^{136}$Xe with a target half-life sensitivity of approximately $10^{28}$ years using $5\times10^3$ kg of isotopically enriched liquid-xenon in a time projection chamber. This improvement of two orders of magnitude in sensitivity over current limits is obtained by a significant increase of the $^{136}$Xe mass, the monolithic and homogeneous configuration of the active medium, and the multi-parameter measurements of the interactions enabled by the time projection chamber. The detector concept and anticipated performance are presented based upon demonstrated realizable background rates., Comment: v2 as published
Published: 2017
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6. Characterization of an Ionization Readout Tile for nEXO

Author: nEXO Collaboration, Jewell, M., Schubert, A., Cen, W. R., Dalmasson, J., DeVoe, R., Fabris, L., Gratta, G., Jamil, A., Li, G., Odian, A., Patel, M., Pocar, A., Qiu, D., Wang, Q., Wen, L. J., Albert, J. B., Anton, G., Arnquist, I. J., Badhrees, I., Barbeau, P., Beck, D., Belov, V., Bourque, F., Brodsky, J. P., Brown, E., Brunner, T., Burenkov, A., Cao, G. F., Cao, L., Chambers, C., Charlebois, S. A., Chiu, M., Cleveland, B., Coon, M., Craycraft, A., Cree, W., Côté, M., Daniels, T., Daugherty, S. J., Daughhetee, J., Delaquis, S., Der Mesrobian-Kabakian, A., Didberidze, T., Dilling, J., Ding, Y. Y., Dolinski, M. J., Dragone, A., Fairbank, W., Farine, J., Feyzbakhsh, S., Fontaine, R., Fudenberg, D., Giacomini, G., Gornea, R., Hansen, E. V., Harris, D., Hasan, M., Heffner, M., Hoppe, E. W., House, A., Hufschmidt, P., Hughes, M., Hößl, J., Ito, Y., Iverson, A., Jiang, X. S., Johnston, S., Karelin, A., Kaufman, L. J., Koffas, T., Kravitz, S., Krücken, R., Kuchenkov, A., Kumar, K. S., Lan, Y., Leonard, D. S., Li, S., Li, Z., Licciardi, C., Lin, Y. H., MacLellan, R., Michel, T., Mong, B., Moore, D., Murray, K., Newby, R. J., Ning, Z., Njoya, O., Nolet, F., Odgers, K., Oriunno, M., Orrell, J. L., Ostrovskiy, I., Overman, C. T., Ortega, G. S., Parent, S., Piepke, A., Pratte, J. -F., Radeka, V., Raguzin, E., Rao, T., Rescia, S., Retiere, F., Robinson, A., Rossignol, T., Rowson, P. C., Roy, N., Saldanha, R., Sangiorgio, S., Schmidt, S., Schneider, J., Sinclair, D., Skarpaas, K., Soma, A. K., St-Hilaire, G., Stekhanov, V., Stiegler, T., Sun, X. L., Tarka, M., Todd, J., Tolba, T., Tsang, R., Tsang, T., Vachon, F., Veeraraghavan, V., Visser, G., Vuilleumier, J. -L., Wagenpfeil, M., Weber, M., Wei, W., Wichoski, U., Wrede, G., Wu, S. X., Wu, W. H., Xuan, Z., Yang, L., Yayun, D., Yen, Y. -R., Zeldovich, O., Zhang, X., Zhao, J., Zhe, N., Zhou, Y., and Ziegler, T.
Subjects: Physics - Instrumentation and Detectors
Abstract: A new design for the anode of a time projection chamber, consisting of a charge-detecting "tile", is investigated for use in large scale liquid xenon detectors. The tile is produced by depositing 60 orthogonal metal charge-collecting strips, 3~mm wide, on a 10~\si{\cm} $\times$ 10~\si{\cm} fused-silica wafer. These charge tiles may be employed by large detectors, such as the proposed tonne-scale nEXO experiment to search for neutrinoless double-beta decay. Modular by design, an array of tiles can cover a sizable area. The width of each strip is small compared to the size of the tile, so a Frisch grid is not required. A grid-less, tiled anode design is beneficial for an experiment such as nEXO, where a wire tensioning support structure and Frisch grid might contribute radioactive backgrounds and would have to be designed to accommodate cycling to cryogenic temperatures. The segmented anode also reduces some degeneracies in signal reconstruction that arise in large-area crossed-wire time projection chambers. A prototype tile was tested in a cell containing liquid xenon. Very good agreement is achieved between the measured ionization spectrum of a $^{207}$Bi source and simulations that include the microphysics of recombination in xenon and a detailed modeling of the electrostatic field of the detector. An energy resolution $\sigma/E$=5.5\% is observed at 570~\si{keV}, comparable to the best intrinsic ionization-only resolution reported in literature for liquid xenon at 936~V/\si{cm}., Comment: 18 pages, 13 figures, as published
Published: 2017
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7. Search for Neutrinoless Double-Beta Decay with the Upgraded EXO-200 Detector

Author: Albert, J. B., Anton, G., Badhrees, I., Barbeau, P. S., Bayerlein, R., Beck, D., Belov, V., Breidenbach, M., Brunner, T., Cao, G. F., Cen, W. R., Chambers, C., Cleveland, B., Coon, M., Craycraft, A., Cree, W., Daniels, T., Danilov, M., Daugherty, S. J., Daughhetee, J., Davis, J., Delaquis, S., Der Mesrobian-Kabakian, A., DeVoe, R., Didberidze, T., Dilling, J., Dolgolenko, A., Dolinski, M. J., Fairbank Jr., W., Farine, J., Feyzbakhsh, S., Fierlinger, P., Fudenberg, D., Gornea, R., Graham, K., Gratta, G., Hall, C., Hansen, E. V., Hoessl, J., Hufschmidt, P., Hughes, M., Jamil, A., Jewell, M. J., Johnson, A., Johnston, S., Karelin, A., Kaufman, L. J., Koffas, T., Kravitz, S., Krücken, R., Kuchenkov, A., Kumar, K. S., Lan, Y., Leonard, D. S., Li, G. S., Li, S., Licciardi, C., Lin, Y. H., MacLellan, R., Michel, T., Mong, B., Moore, D., Murray, K., Nelson, R., Njoya, O., Odian, A., Ostrovskiy, I., Piepke, A., Pocar, A., Retière, F., Rowson, P. C., Russell, J. J., Schmidt, S., Schubert, A., Sinclair, D., Stekhanov, V., Tarka, M., Tolba, T., Tsang, R., Vogel, P., Vuilleumier, J. -L., Wagenpfeil, M., Waite, A., Walton, T., Weber, M., Wen, L. J., Wichoski, U., Wrede, G., Yang, L., Yen, Y. -R., Zeldovich, O. Ya., Zettlemoyer, J., and Ziegler, T.
Subjects: High Energy Physics - Experiment, Nuclear Experiment
Abstract: Results from a search for neutrinoless double-beta decay $0\nu\beta\beta$ of $^{136}$Xe are presented using the first year of data taken with the upgraded EXO-200 detector. Relative to previous searches by EXO-200, the energy resolution of the detector has been improved to $\sigma/E$=1.23%, the electric field in the drift region has been raised by 50%, and a system to suppress radon in the volume between the cryostat and lead shielding has been implemented. In addition, analysis techniques that improve topological discrimination between $0\nu\beta\beta$ and background events have been developed. Incorporating these hardware and analysis improvements, the median 90% confidence level $0\nu\beta\beta$ half-life sensitivity after combining with the full data set acquired before the upgrade has increased 2-fold to $3.7 \times 10^{25}$ yr. No statistically significant evidence for $0\nu\beta\beta$ is observed, leading to a lower limit on the $0\nu\beta\beta$ half-life of $1.8\times10^{25}$ yr at the 90% confidence level., Comment: 6 pages, 4 figures, final version submitted to PRL
Published: 2017
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8. Searches for Double Beta Decay of $^{134}$Xe with EXO-200

Author: Collaboration, EXO-200, Albert, J. B., Anton, G., Badhrees, I., Barbeau, P. S., Bayerlein, R., Beck, D., Belov, V., Breidenbach, M., Brunner, T., Cao, G. F., Cen, W. R., Chambers, C., Cleveland, B., Coon, M., Craycraft, A., Cree, W., Daniels, T., Danilov, M., Daugherty, S. J., Daughhetee, J., Davis, J., Delaquis, S., Der Mesrobian-Kabakian, A., DeVoe, R., Didberidze, T., Dilling, J., Dolgolenko, A., Dolinski, M. J., Fairbank Jr., W., Farine, J., Feyzbakhsh, S., Fierlinger, P., Fudenberg, D., Gornea, R., Graham, K., Gratta, G., Hall, C., Hoessl, J., Hufschmidt, P., Hughes, M., Jamil, A., Jewell, M. J., Johnson, A., Johnston, S., Karelin, A., Kaufman, L. J., Koffas, T., Kravitz, S., Krücken, R., Kuchenkov, A., Kumar, K. S., Lan, Y., Leonard, D. S., Li, S., Licciardi, C., Lin, Y. H., MacLellan, R., Marino, M. G., Michel, T., Mong, B., Moore, D., Murray, K., Nelson, R., Njoya, O., Odian, A., Ostrovskiy, I., Piepke, A., Pocar, A., Retière, F., Rowson, P. C., Russell, J. J., Schubert, A., Sinclair, D., Smith, E., Stekhanov, V., Tarka, M., Tolba, T., Tsang, R., Vogel, P., Vuilleumier, J. -L., Wagenpfeil, M., Waite, A., Walton, J., Walton, T., Weber, M., Wen, L. J., Wichoski, U., Yang, L., Yen, Y. -R., Zeldovich, O. Ya., Zettlemoyer, J., and Ziegler, T.
Subjects: High Energy Physics - Experiment, Nuclear Experiment
Abstract: Searches for double beta decay of $^{134}$Xe were performed with EXO-200, a single-phase liquid xenon detector designed to search for neutrinoless double beta decay of $^{136}$Xe. Using an exposure of $29.6\text{ kg}\!\cdot\!\text{yr}$, the lower limits of $\text{T}_{1/2}^{2\nu\beta\!\beta}>8.7\cdot10^{20}\text{ yr}$ and $\text{T}_{1/2}^{0\nu\beta\!\beta}>1.1\cdot10^{23}\text{ yr}$ at 90% confidence level were derived, with corresponding half-life sensitivities of $1.2\cdot10^{21}\text{ yr}$ and $1.9\cdot10^{23}\text{ yr}$. These limits exceed those in the literature for $^{134}$Xe, improving by factors of nearly $10^{5}$ and 2 for the two antineutrino and neutrinoless modes, respectively., Comment: 8 pages, 4 figures
Published: 2017
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9. Trace radioactive impurities in final construction materials for EXO-200

Author: Leonard, D. S., Auty, D., Didberidze, T., Gornea, R., Grinberg, P., MacLellan, R., Methven, B., Piepke, A., Vuilleumier, J. -L., Albert, J. B., Anton, G., Badhrees, I., Barbeau, P. S., Bayerlein, R., Beck, D., Belov, V., Breidenbach, M., Brunner, T., Cao, G. F., Cen, W. R., Chambers, C., Cleveland, B., Coon, M., Craycraft, A., Cree, W., Daniels, T., Danilov, M., Daugherty, S. J., Daughhetee, J., Davis, J., Delaquis, S., Der Mesrobian-Kabakian, A., DeVoe, R., Dilling, J., Dolgolenko, A., Dolinski, M. J., Fairbank Jr., W., Farine, J., Feyzbakhsh, S., Fierlinger, P., Fudenberg, D., Graham, K., Gratta, G., Hall, C., Herrin, S., Hoessl, J., Hufschmidt, P., Hughes, M., Jamil, A., Jewell, M. J., Johnson, A., Johntson, S., Karelin, A., Kaufman, L. J., Koffas, T., Kravitz, S., Krücken, R., Kuchenkov, A., Kumar, K. S., Lan, Y., LePort, F., Li, S., Licciardi, C., Lin, Y. H., Mackay, D., Marino, M. G., Michel, T., Mong, B., Moore, D., Murray, K., Neilson, R., Nelson, R., Njoya, O., Odian, A., Ostrovskiy, I., Pocar, A., Pushkin, K., Retière, F., Rowson, P. C., Russell, J. J., Schubert, A., Sinclair, D., Smith, E., Stekhanov, V., Tarka, M., Tolba, T., Tsang, R., Wagenpfeil, M., Waite, A., Walton, J., Walton, T., Wamba, K., Weber, M., Wen, L. J., Wichoski, U., Wodin, J., Yang, L., Yen, Y. -R., Zeldovich, O. Ya., Zettlemoyer, J., and Ziegler, T.
Subjects: Physics - Instrumentation and Detectors, Nuclear Experiment
Abstract: We report results from a systematic measurement campaign conducted to identify low radioactivity materials for the construction of the EXO-200 double beta decay experiment. Partial results from this campaign have already been reported in a 2008 paper by the EXO collaboration. Here we release the remaining data, collected since 2007, to the public. The data reported were obtained using a variety of analytic techniques. The measurement sensitivities are among the best in the field. Construction of the EXO-200 detector has been concluded, and Phase-I data was taken from 2011 to 2014. The detector's extremely low background implicitly verifies the measurements and the analysis assumptions made during construction and reported in this paper., Comment: 28 pages, 5 figures
Published: 2017
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10. Search for nucleon decays with EXO-200

Author: Albert, JB, Anton, G, Badhrees, I, Barbeau, PS, Bayerlein, R, Beck, D, Belov, V, Breidenbach, M, Brunner, T, Cao, GF, Cen, WR, Chambers, C, Cleveland, B, Coon, M, Craycraft, A, Cree, W, Daniels, T, Danilov, M, Daugherty, SJ, Daughhetee, J, Davis, J, Delaquis, S, Der Mesrobian-Kabakian, A, DeVoe, R, Didberidze, T, Dilling, J, Dolgolenko, A, Dolinski, MJ, Fairbank, W, Farine, J, Feyzbakhsh, S, Fierlinger, P, Fudenberg, D, Gornea, R, Graham, K, Gratta, G, Hall, C, Hansen, EV, Hoessl, J, Homiller, S, Hufschmidt, P, Hughes, M, Jamil, A, Jewell, MJ, Johnson, A, Johnston, S, Karelin, A, Kaufman, LJ, Koffas, T, Kravitz, S, Krücken, R, Kuchenkov, A, Kumar, KS, Lan, Y, Leonard, DS, Li, GS, Li, S, Licciardi, C, Lin, YH, MacLellan, R, Michel, T, Mong, B, Moore, D, Murray, K, Nelson, R, Njoya, O, Odian, A, Ostrovskiy, I, Piepke, A, Pocar, A, Retière, F, Robinson, AL, Rowson, PC, Schmidt, S, Schubert, A, Sinclair, D, Soma, AK, Stekhanov, V, Tarka, M, Tolba, T, Tsang, R, Vogel, P, Vuilleumier, J-L, Wagenpfeil, M, Waite, A, Walton, T, Weber, M, Wen, LJ, Wichoski, U, Wrede, G, Yang, L, Yen, Y-R, Zeldovich, OY, Zettlemoyer, J, and Ziegler, T
Published: 2018

11. Measurement of the Drift Velocity and Transverse Diffusion of Electrons in Liquid Xenon with the EXO-200 Detector

Author: Collaboration, EXO-200, Albert, J. B., Barbeau, P. S., Beck, D., Belov, V., Breidenbach, M., Brunner, T., Burenkov, A., Cao, G. F., Cen, W. R., Chambers, C., Cleveland, B., Coon, M., Craycraft, A., Daniels, T., Danilov, M., Daugherty, S. J., Daughhetee, J., Davis, J., Delaquis, S., Der Mesrobian-Kabakian, A., DeVoe, R., Didberidze, T., Dilling, J., Dolgolenko, A., Dolinski, M. J., Dunford, M., Fairbank Jr., W., Farine, J., Feyzbakhsh, S., Fierlinger, P., Fudenberg, D., Gornea, R., Graham, K., Gratta, G., Hall, C., Hughes, M., Jewell, M. J., Johnson, A., Johnson, T. N., Johnston, S., Karelin, A., Kaufman, L. J., Killick, R., Koffas, T., Kravitz, S., Krucken, R., Kuchenkov, A., Kumar, K. S., Lan, Y., Leonard, D. S., Licciardi, C., Lin, Y. H., MacLellan, R., Marino, M. G., Mong, B., Moore, D., Njoya, O., Nelson, R., Odian, A., Ostrovskiy, I., Piepke, A., Pocar, A., Prescott, C. Y., Retiere, F., Rowson, P. C., Russell, J. J., Schubert, A., Sinclair, D., Smith, E., Stekhanov, V., Tarka, M., Tolba, T., Tsang, R., Twelker, K., Vuilleumier, J. -L., Waite, A., Walton, J., Walton, T., Weber, M., Wen, L. J., Wichoski, U., Wood, J., Yang, L., Yen, Y. -R., Zeldovich, O. Ya., and Zettlemoyer, J.
Subjects: Physics - Instrumentation and Detectors, High Energy Physics - Experiment
Abstract: The EXO-200 Collaboration is searching for neutrinoless double beta decay using a liquid xenon (LXe) time projection chamber. This measurement relies on modeling the transport of charge deposits produced by interactions in the LXe to allow discrimination between signal and background events. Here we present measurements of the transverse diffusion constant and drift velocity of electrons at drift fields between 20~V/cm and 615~V/cm using EXO-200 data. At the operating field of 380~V/cm EXO-200 measures a drift velocity of 1.705$_{-0.010}^{+0.014}$~mm/$\mu$s and a transverse diffusion coefficient of 55$\pm$4~cm$^2$/s., Comment: 9 pages, 7 figures, added minor clarifications recommended by the reviewer on E-field non-uniformities, minor edits to formatting of figures to conform with journal requirements
Published: 2016
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12. An Optimal Energy Estimator to Reduce Correlated Noise for the EXO-200 Light Readout

Author: Collaboration, EXO-200, Davis, C. G., Hall, C., Albert, J. B., Barbeau, P. S., Beck, D., Belov, V., Breidenbach, M., Brunner, T., Burenkov, A., Cao, G. F., Cen, W. R., Chambers, C., Cleveland, B., Coon, M., Craycraft, A., Daniels, T., Danilov, M., Daugherty, S. J., Davis, J., Delaquis, S., Der Mesrobian-Kabakian, A., DeVoe, R., Didberidze, T., Dilling, J., Dolgolenko, A., Dolinski, M. J., Dunford, M., Fairbank Jr., W., Farine, J., Feldmeier, W., Feyzbakhsh, S., Fierlinger, P., Fudenberg, D., Gornea, R., Graham, K., Gratta, G., Hughes, M., Jewell, M. J., Johnson, A., Johnson, T. N., Johnston, S., Karelin, A., Kaufman, L. J., Killick, R., Koffas, T., Kravitz, S., Krücken, R., Kuchenkov, A., Kumar, K. S., Leonard, D. S., Licciardi, C., Lin, Y. H., Ling, J., MacLellan, R., Marino, M. G., Mong, B., Moore, D., Njoya, O., Nelson, R., Odian, A., Ostrovskiy, I., Piepke, A., Pocar, A., Prescott, C. Y., Retière, F., Rowson, P. C., Russell, J. J., Schubert, A., Sinclair, D., Smith, E., Stekhanov, V., Tarka, M., Tolba, T., Tsang, R., Twelker, K., Vuilleumier, J. -L., Waite, A., Walton, J., Walton, T., Weber, M., Wen, L. J., Wichoski, U., Wood, J., Yang, L., Yen, Y. -R., and Zeldovich, O. Ya.
Subjects: Physics - Instrumentation and Detectors, High Energy Physics - Experiment, Nuclear Experiment
Abstract: The energy resolution of the EXO-200 detector is limited by electronics noise in the measurement of the scintillation response. Here we present a new technique to extract optimal scintillation energy measurements for signals split across multiple channels in the presence of correlated noise. The implementation of these techniques improves the energy resolution of the detector at the neutrinoless double beta decay Q-value from $\left[1.9641\pm 0.0039\right]\%$ to $\left[1.5820\pm 0.0044\right]\%$., Comment: 21 pages, 8 figures, 1 table
Published: 2016
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13. First Search for Lorentz and CPT Violation in Double Beta Decay with EXO-200

Author: Collaboration, EXO-200, Albert, J. B., Barbeau, P. S., Beck, D., Belov, V., Breidenbach, M., Brunner, T., Burenkov, A., Cao, G. F., Chambers, C., Cleveland, B., Coon, M., Craycraft, A., Daniels, T., Danilov, M., Daugherty, S. J., Davis, C. G., Davis, J., Delaquis, S., Der Mesrobian-Kabakian, A., DeVoe, R., Díaz, J. S., Didberidze, T., Dilling, J., Dolgolenko, A., Dolinski, M. J., Dunford, M., Fairbank Jr., W., Farine, J., Feyzbkhsh, S., Feldmeier, W., Fierlinger, P., Fudenberg, D., Gornea, R., Graham, K., Gratta, G., Hall, C., Homiller, S., Hughes, M., Jewell, M. J., Jiang, X. S., Johnson, A., Johnson, T. N., Johnston, S., Karelin, A., Kaufman, L. J., Killick, R., Koffas, T., Kravitz, S., Krücken, R., Kuchenkov, A., Kumar, K. S., Leonard, D. S., Lin, Y. H., Ling, J., MacLellan, R., Marino, M. G., Mong, B., Moore, D., Nelson, R., Njoya, O., Odian, A., Ostrovskiy, I., Piepke, A., Pocar, A., Prescott, C. Y., Retiére, F., Rowson, P. C., Russell, J. J., Schubert, A., Sinclair, D., Smith, E., Stekhanov, V., Tarka, M., Tolba, T., Tsang, R., Twelker, K., Vuilleumier, J. -L., Vogel, P., Waite, A., Walton, J., Walton, T., Weber, M., Wen, L. J., Wichoski, U., Wood, J., Yang, L., Yen, Y. -R., and Zeldovich, O. Ya.
Subjects: Nuclear Experiment, High Energy Physics - Phenomenology
Abstract: A search for Lorentz- and CPT-violating signals in the double beta decay spectrum of $^{136}$Xe has been performed using an exposure of 100 kg$\cdot$yr with the EXO-200 detector. No significant evidence of the spectral modification due to isotropic Lorentz-violation was found, and a two-sided limit of $-2.65 \times 10^{-5 } \; \textrm{GeV} < \mathring{a}^{(3)}_{\text{of}} < 7.60 \times 10^{-6} \; \textrm{GeV}$ (90% C.L.) is placed on the relevant coefficient within the Standard-Model Extension (SME). This is the first experimental study of the effect of the SME-defined oscillation-free and momentum-independent neutrino coupling operator on the double beta decay process., Comment: 6 pages, 3 figures
Published: 2016
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14. Cosmogenic Backgrounds to 0{\nu}{\beta}{\beta} in EXO-200

Author: Collaboration, EXO-200, Albert, J. B., Auty, D. J., Barbeau, P. S., Beck, D., Belov, V., Breidenbach, M., Brunner, T., Burenkov, A., Cao, G. F., Chambers, C., Cleveland, B., Coon, M., Craycraft, A., Daniels, T., Danilov, M., Daugherty, S. J., Davis, J., Delaquis, S., Der Mesrobian-Kabakian, A., DeVoe, R., Didberidze, T., Dilling, J., Dolgolenko, A., Dolinski, M. J., Dunford, M., Fairbank Jr, W., Farine, J., Feldmeier, W., Feyzbakhsh, S., Fierlinger, P., Fudenberg, D., Gornea, R., Graham, K., Gratta, G., Hall, C., Herrin, S., Hughes, M., Jewell, M. J., Johnson, A., Johnson, T. N., Johnston, S., Karelin, A., Kaufman, L. J., Killick, R., Koffas, T., Kravitz, S., Krücken, R., Kuchenkov, A., Kumar, K. S., Leonard, D. S., Licciardi, C., Lin, Y. H., Ling, J., MacLellan, R., Marino, M. G., Mong, B., Moore, D., Njoya, O., Nelson, R., Odian, A., Ostrovskiy, I., Piepke, A., Pocar, A., Prescott, C. Y., Retière, F., Rowson, P. C., Russell, J. J., Schubert, A., Sinclair, D., Smith, E., Stekhanov, V., Tarka, M., Tolba, T., Tsang, R., Twelker, K., Vuilleumier, J. -L., Waite, A., Walton, J., Walton, T., Weber, M., Wen, L. J., Wichoski, U., Wood, J., Yang, L., Yen, Y. -R., and Zeldovich, O. Ya.
Subjects: Nuclear Experiment, High Energy Physics - Experiment, Physics - Instrumentation and Detectors
Abstract: As neutrinoless double-beta decay experiments become more sensitive and intrinsic radioactivity in detector materials is reduced, previously minor contributions to the background must be understood and eliminated. With this in mind, cosmogenic backgrounds have been studied with the EXO-200 experiment. Using the EXO-200 TPC, the muon flux (through a flat horizontal surface) underground at the Waste Isolation Pilot Plant (WIPP) has been measured to be {\Phi} = 4.07 $\pm$ 0.14 (sys) $\pm$ 0.03 (stat) $\times$ $10^{-7}$cm$^{-2}$ s$^{-1}$, with a vertical intensity of $I_{v}$ = 2.97$^{+0.14}_{-0.13}$ (sys) $\pm$ 0.02 (stat) $\times$ $10^{-7}$cm$^{-2}$ s$^{-1}$ sr$^{-1}$. Simulations of muon-induced backgrounds identified several potential cosmogenic radionuclides, though only 137Xe is a significant background for the 136Xe 0{\nu}{\beta}{\beta} search with EXO-200. Muon-induced neutron backgrounds were measured using {\gamma}-rays from neutron capture on the detector materials. This provided a measurement of 137Xe yield, and a test of the accuracy of the neutron production and transport simulations. The independently measured rates of 136Xe neutron capture and of 137Xe decay agree within uncertainties. Geant4 and FLUKA simulations were performed to estimate neutron capture rates, and these estimates agreed to within ~40% or better with measurements. The ability to identify 136Xe(n,{\gamma}) events will allow for rejection of 137Xe backgrounds in future 0{\nu}{\beta}{\beta} analyses., Comment: Published in JCAP, 29 pages, 13 figures
Published: 2015
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15. Search for $2\nu\beta\beta$ decay of $^{136}$Xe to the 0$_1^+$ excited state of $^{136}$Ba with EXO-200

Author: Collaboration, EXO-200, Albert, J. B., Auty, D. J., Barbeau, P. S., Beck, D., Belov, V., Breidenbach, M., Brunner, T., Burenkov, A., Cao, G. F., Chambers, C., Chaves, J., Cleveland, B., Coon, M., Craycraft, A., Daniels, T., Danilov, M., Daugherty, S. J., Davis, J., Delaquis, S., Der Mesrobian-Kabakian, A., DeVoe, R., Didberidze, T., Dilling, J., Dolgolenko, A., Dolinski, M. J., Dunford, M., Fairbank Jr., W., Farine, J., Feldmeier, W., Feyzbakhsh, S., Fierlinger, P., Fudenberg, D., Gornea, R., Graham, K., Gratta, G., Hall, C., Hughes, M., Jewell, M. J., Johnson, A., Johnson, T. N., Johnston, S., Karelin, A., Kaufman, L. J., Killick, R., King, J., Koffas, T., Kravitz, S., Krücken, R., Kuchenkov, A., Kumar, K. S., Leonard, D. S., Licciardi, C., Lin, Y. H., Ling, J., MacLellan, R., Marino, M. G., Mong, B., Moore, D., Njoya, O., Nelson, R., Odian, A., Ostrovskiy, I., Piepke, A., Pocar, A., Prescott, C. Y., Retière, F., Rowson, P. C., Russell, J. J., Schubert, A., Sinclair, D., Smith, E., Stekhanov, V., Tarka, M., Tolba, T., Tsang, R., Twelker, K., Vogel, P., Vuilleumier, J. -L., Waite, A., Walton, J., Walton, T., Weber, M., Wen, L. J., Wichoski, U., Winick, T. A., Wood, J., Xu, Q. Y., Yang, L., Yen, Y. -R., and Zeldovich, O. Ya.
Subjects: Nuclear Experiment, High Energy Physics - Experiment
Abstract: EXO-200 is a single phase liquid xenon detector designed to search for neutrinoless double-beta decay of $^{136}$Xe to the ground state of $^{136}$Ba. We report here on a search for the two-neutrino double-beta decay of $^{136}$Xe to the first $0^+$ excited state, $0^+_1$, of $^{136}$Ba based on a 100 kg$\cdot$yr exposure of $^{136}$Xe. Using a specialized analysis employing a machine learning algorithm, we obtain a 90% CL half-life sensitivity of $1.7 \times 10^{24}$ yr. We find no statistically significant evidence for the $2\nu\beta\beta$ decay to the excited state resulting in a lower limit of $T^{2\nu}_{1/2}$ ($0^+ \rightarrow 0^+_1$) $> 6.9 \times 10^{23}$ yr at 90% CL. This observed limit is consistent with the estimated half-life of $2.5\times10^{25}$ yr., Comment: 10 pages, 7 figures, 2 tables
Published: 2015
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16. Measurements of the ion fraction and mobility of alpha and beta decay products in liquid xenon using EXO-200

Author: Albert, J. B., Auty, D. J., Barbeau, P. S., Beck, D., Belov, V., Breidenbach, M., Brunner, T., Burenkov, A., Cao, G. F., Chambers, C., Cleveland, B., Coon, M., Craycraft, A., Daniels, T., Danilov, M., Daugherty, S. J., Davis, C. G., Davis, J., Delaquis, S., Der Mesrobian-Kabakian, A., DeVoe, R., Didberidze, T., Dolgolenko, A., Dolinski, M. J., Dunford, M., Fairbank Jr., W., Farine, J., Feldmeier, W., Fierlinger, P., Fudenberg, D., Gornea, R., Graham, K., Gratta, G., Hall, C., Hughes, M., Jewell, M. J., Jiang, X. S., Johnson, A., Johnson, T. N., Johnston, S., Karelin, A., Kaufman, L. J., Killick, R., Koffas, T., Kravitz, S., Kuchenkov, A., Kumar, K. S., Leonard, D. S., Licciardi, C., Lin, Y. H., Ling, J., MacLellan, R., Marino, M. G., Mong, B., Moore, D., Nelson, R., O'Sullivan, K., Odian, A., Ostrovskiy, I., Piepke, A., Pocar, A., Prescott, C. Y., Robinson, A., Rowson, P. C., Russell, J. J., Schubert, A., Sinclair, D., Smith, E., Stekhanov, V., Tarka, M., Tolba, T., Tsang, R., Twelker, K., Vuilleumier, J. -L., Waite, A., Walton, J., Walton, T., Weber, M., Wen, L. J., Wichoski, U., Wright, J. D., Wood, J., Yang, L., Yen, Y. -R., and Zeldovich, O. Ya.
Subjects: Nuclear Experiment, Physics - Instrumentation and Detectors
Abstract: Alpha decays in the EXO-200 detector are used to measure the fraction of charged $^{218}\mathrm{Po}$ and $^{214}\mathrm{Bi}$ daughters created from alpha and beta decays, respectively. $^{222}\mathrm{Rn}$ alpha decays in liquid xenon (LXe) are found to produce $^{218}\mathrm{Po}^{+}$ ions $50.3 \pm 3.0\%$ of the time, while the remainder of the $^{218}\mathrm{Po}$ atoms are neutral. The fraction of $^{214}\mathrm{Bi}^{+}$ from $^{214}\mathrm{Pb}$ beta decays in LXe is found to be $76.4 \pm 5.7\%$, inferred from the relative rates of $^{218}\mathrm{Po}$ and $^{214}\mathrm{Po}$ alpha decays in the LXe. The average velocity of $^{218}\mathrm{Po}$ ions is observed to decrease for longer drift times. Initially the ions have a mobility of $0.390 \pm 0.006~\mathrm{cm}^2/(\mathrm{kV}~\mathrm{s})$, and at long drift times the mobility is $0.219 \pm 0.004~\mathrm{cm}^2/(\mathrm{kV}~\mathrm{s})$. Time constants associated with the change in mobility during drift of the $^{218}\mathrm{Po}^{+}$ ions are found to be proportional to the electron lifetime in the LXe.
Published: 2015
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17. Investigation of radioactivity-induced backgrounds in EXO-200

Author: Albert, J. B., Auty, D. J., Barbeau, P. S., Beck, D., Belov, V., Benitez-Medina, C., Breidenbach, M., Brunner, T., Burenkov, A., Cao, G. F., Chambers, C., Cleveland, B., Coon, M., Craycraft, A., Daniels, T., Danilov, M., Daugherty, S. J., Davis, C. G., Davis, J., Delaquis, S., Der Mesrobian-Kabakian, A., DeVoe, R., Didberidze, T., Dolgolenko, A., Dolinski, M. J., Dunford, M., Fairbank Jr., W., Farine, J., Feldmeier, W., Fierlinger, P., Fudenberg, D., Giroux, G., Gornea, R., Graham, K., Gratta, G., Hall, C., Herrin, S., Hughes, M., Jewell, M. J., Jiang, X. S., Johnson, A., Johnson, T. N., Johnston, S., Karelin, A., Kaufman, L. J., Killick, R., Koffas, T., Kravitz, S., Kuchenkov, A., Kumar, K. S., Leonard, D. S., Licciardi, C., Lin, Y. H., Ling, J., MacLellan, R., Marino, M. G., Mong, B., Moore, D., Nelson, R., Odian, A., Ostrovskiy, I., Piepke, A., Pocar, A., Prescott, C. Y., Rivas, A., Rowson, P. C., Russell, J. J., Schubert, A., Sinclair, D., Smith, E., Stekhanov, V., Tarka, M., Tolba, T., Tsang, R., Twelker, K., Vuilleumier, J. -L., Waite, A., Walton, J., Walton, T., Weber, M., Wen, L. J., Wichoski, U., Wood, J., Yang, L., Yen, Y. -R., and Zeldovich, O. Ya.
Subjects: Physics - Instrumentation and Detectors, High Energy Physics - Experiment, Nuclear Experiment
Abstract: The search for neutrinoless double-beta decay (0{\nu}{\beta}{\beta}) requires extremely low background and a good understanding of their sources and their influence on the rate in the region of parameter space relevant to the 0{\nu}{\beta}{\beta} signal. We report on studies of various {\beta}- and {\gamma}-backgrounds in the liquid- xenon-based EXO-200 0{\nu}{\beta}{\beta} experiment. With this work we try to better understand the location and strength of specific background sources and compare the conclusions to radioassay results taken before and during detector construction. Finally, we discuss the implications of these studies for EXO-200 as well as for the next-generation, tonne-scale nEXO detector., Comment: 9 pages, 7 figures, 3 tables
Published: 2015
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18. Characterization of Silicon Photomultipliers for nEXO

Author: Ostrovskiy, I., Retiere, F., Auty, D., Dalmasson, J., Didberidze, T., DeVoe, R., Gratta, G., Huth, L., James, L., Lupin-Jimenez, L., Ohmert, N., and Piepke, A.
Subjects: Physics - Instrumentation and Detectors, High Energy Physics - Experiment, Nuclear Experiment
Abstract: Silicon Photomultipliers (SiPMs) are attractive candidates for light detectors for next generation liquid xenon double-beta decay experiments, like nEXO. In this paper we discuss the requirements that the SiPMs must satisfy in order to be suitable for nEXO and similar experiments, describe the two test setups operated by the nEXO collaboration, and present the results of characterization of SiPMs from several vendors. In particular, we find that the photon detection efficiency at the peak of xenon scintillation light emission (175-178 nm) approaches the nEXO requirements for tested FBK and Hamamatsu devices. Additionally, the nEXO collaboration performed radioassay of several grams of bare FBK devices using neutron activation analysis, indicating levels of 40K, 232Th, and 238U of the order of <0.15, (6.9e10-4 - 1.3e10-2), and <0.11 mBq/kg, respectively., Comment: Version as accepted to Transaction of Nuclear Science. 12 pages, 15 figures (one figure removed following peer review), 8 tables (1 table added following peer review)
Published: 2015
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19. Spectroscopy of Ba and Ba$^+$ deposits in solid xenon for barium tagging in nEXO

Author: Mong, B., Cook, S., Walton, T., Chambers, C., Craycraft, A., Benitez-Medina, C., Hall, K., Fairbank Jr., W., Albert, J. B., Auty, D. J., Barbeau, P. S., Basque, V., Beck, D., Breidenbach, M., Brunner, T., Cao, G. F., Cleveland, B., Coon, M., Daniels, T., Daugherty, S. J., DeVoe, R., Didberidze, T., Dilling, J., Dolinski, M. J., Dunford, M., Fabris, L., Farine, J., Feldmeier, W., Fierlinger, P., Fudenberg, D., Giroux, G., Gornea, R., Graham, K., Gratta, G., Heffner, M., Hughes, M., Jiang, X. S., Johnson, T. N., Johnston, S., Karelin, A., Kaufman, L. J., Killick, R., Koffas, T., Kravitz, S., Krucken, R., Kuchenkov, A., Kumar, K. S., Leonard, D. S., Licciardi, C., Lin, Y. H., Ling, J., MacLellan, R., Marino, M. G., Moore, D., Odian, A., Ostrovskiy, I., Piepke, A., Pocar, A., Retiere, F., Rowson, P. C., Rozo, M. P., Schubert, A., Sinclair, D., Smith, E., Stekhanov, V., Tarka, M., Tolba, T., Twelker, K., Vuilleumier, J. -L., Walton, J., Weber, M., Wen, L. J., Wichoski, U., Yang, L., Yen, Y. -R., and Zhao, Y. B.
Subjects: Physics - Atomic Physics, High Energy Physics - Experiment, Nuclear Experiment, Physics - Instrumentation and Detectors
Abstract: Progress on a method of barium tagging for the nEXO double beta decay experiment is reported. Absorption and emission spectra for deposits of barium atoms and ions in solid xenon matrices are presented. Excitation spectra for prominent emission lines, temperature dependence and bleaching of the fluorescence reveal the existence of different matrix sites. A regular series of sharp lines observed in Ba$^+$ deposits is identified with some type of barium hydride molecule. Lower limits for the fluorescence quantum efficiency of the principal Ba emission transition are reported. Under current conditions, an image of $\le10^4$ Ba atoms can be obtained. Prospects for imaging single Ba atoms in solid xenon are discussed.
Published: 2014
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20. Search for Majoron-emitting modes of double-beta decay of $^{136}$Xe with EXO-200

Author: Collaboration, EXO-200, Albert, J. B., Auty, D. J., Barbeau, P. S., Beauchamp, E., Beck, D., Belov, V., Benitez-Medina, C., Breidenbach, M., Brunner, T., Burenkov, A., Cao, G. F., Chambers, C., Chaves, J., Cleveland, B., Coon, M., Craycraft, A., Daniels, T., Danilov, M., Daugherty, S. J., Davis, C. G., Davis, J., DeVoe, R., Delaquis, S., Didberidze, T., Dolgolenko, A., Dolinski, M. J., Dunford, M., Fairbank Jr., W., Farine, J., Feldmeier, W., Fierlinger, P., Fudenberg, D., Giroux, G., Gornea, R., Graham, K., Gratta, G., Hall, C., Herrin, S., Hughes, M., Jewell, M. J., Jiang, X. S., Johnson, A., Johnson, T. N., Johnston, S., Karelin, A., Kaufman, L. J., Killick, R., Koffas, T., Kravitz, S., Kuchenkov, A., Kumar, K. S., Leonard, D. S., Leonard, F., Licciardi, C., Lin, Y. H., Ling, J., MacLellan, R., Marino, M. G., Mong, B., Moore, D., Nelson, R., Odian, A., Ostrovskiy, I., Ouellet, C., Piepke, A., Pocar, A., Prescott, C. Y., Rivas, A., Rowson, P. C., Rozo, M. P., Russell, J. J., Schubert, A., Sinclair, D., Smith, E., Stekhanov, V., Tarka, M., Tolba, T., Tosi, D., Tsang, R., Twelker, K., Vogel, P., Vuilleumier, J. -L., Waite, A., Walton, J., Walton, T., Weber, M., Wen, L. J., Wichoski, U., Yang, L., Yen, Y. -R., and Zeldovich, O. Ya.
Subjects: High Energy Physics - Experiment, Nuclear Experiment, Physics - Instrumentation and Detectors
Abstract: EXO-200 is a single phase liquid xenon detector designed to search for neutrinoless double-beta decay of $^{136}$Xe. Here we report on a search for various Majoron-emitting modes based on 100 kg$\cdot$yr exposure of $^{136}$Xe. A lower limit of $T^{^{136}Xe}_{1/2} >1.2 \cdot 10^{24}$ yr at 90% C.L. on the half-life of the spectral index = 1 Majoron decay was obtained, corresponding to a constraint on the Majoron-neutrino coupling constant of $|< g^{M}_{ee} >|<$ (0.8-1.7)$\cdot$10$^{-5}$., Comment: Published in PRD. Version 2: Referee comments addressed, journal reference added
Published: 2014
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21. An apparatus to manipulate and identify individual Ba ions from bulk liquid Xe

Author: Twelker, K., Kravitz, S., Díez, M. Montero, Gratta, G., Fairbank Jr., W., Albert, J. B., Auty, D. J., Barbeau, P. S., Beck, D., Benitez-Medina, C., Breidenbach, M., Brunner, T., Cao, G. F., Chambers, C., Cleveland, B., Coon, M., Craycraft, A., Daniels, T., Daugherty, S. J., Davis, C. G., DeVoe, R., Delaquis, S., Didberidze, T., Dilling, J., Dolinski, M. J., Dunford, M., Fabris, L., Farine, J., Feldmeier, W., Fierlinger, P., Fudenberg, D., Giroux, G., Gornea, R., Graham, K., Hall, C., Heffner, M., Herrin, S., Hughes, M., Jiang, X. S., Johnson, T. N., Johnston, S., Karelin, A., Kaufman, L. J., Killick, R., Koffas, T., Krücken, R., Kuchenkov, A., Kumar, K. S., Leonard, D. S., Leonard, F., Licciardi, C., Lin, Y. H., MacLellan, R., Marino, M. G., Mong, B., Moore, D., Odian, A., Ostrovskiy, I., Ouellet, C., Piepke, A., Pocar, A., Retiere, F., Rowson, P. C., Rozo, M. P., Schubert, A., Sinclair, D., Smith, E., Stekhanov, V., Tarka, M., Tolba, T., Tosi, D., Vuilleumier, J. -L., Walton, J., Walton, T., Weber, M., Wen, L. J., Wichoski, U., Yang, L., Yen, Y. -R., and Zhao, Y. B.
Subjects: Physics - Instrumentation and Detectors
Abstract: We describe a system to transport and identify barium ions produced in liquid xenon, as part of R&D towards the second phase of a double beta decay experiment, nEXO. The goal is to identify the Ba ion resulting from an extremely rare nuclear decay of the isotope $^{136}$Xe, hence providing a confirmation of the occurrence of the decay. This is achieved through Resonance Ionization Spectroscopy (RIS). In the test setup described here, Ba ions can be produced in liquid xenon or vacuum and collected on a clean substrate. This substrate is then removed to an analysis chamber under vacuum, where laser-induced thermal desorption and RIS are used with time-of-flight (TOF) mass spectroscopy for positive identification of the barium decay product., Comment: 12 pages, 13 figures
Published: 2014
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22. Search for Majorana neutrinos with the first two years of EXO-200 data

Author: Collaboration, EXO-200, Albert, J. B., Auty, D. J., Barbeau, P. S., Beauchamp, E., Beck, D., Belov, V., Benitez-Medina, C., Bonatt, J., Breidenbach, M., Brunner, T., Burenkov, A., Cao, G. F., Chambers, C., Chaves, J., Cleveland, B., Coon, M., Craycraft, A., Daniels, T., Danilov, M., Daugherty, S. J., Davis, C. G., Davis, J., DeVoe, R., Delaquis, S., Didberidze, T., Dolgolenko, A., Dolinski, M. J., Dunford, M., Fairbank Jr., W., Farine, J., Feldmeier, W., Fierlinger, P., Fudenberg, D., Giroux, G., Gornea, R., Graham, K., Gratta, G., Hall, C., Herrin, S., Hughes, M., Jewell, M. J., Jiang, X. S., Johnson, A., Johnson, T. N., Johnston, S., Karelin, A., Kaufman, L. J., Killick, R., Koffas, T., Kravitz, S., Kuchenkov, A., Kumar, K. S., Leonard, D. S., Leonard, F., Licciardi, C., Lin, Y. H., MacLellan, R., Marino, M. G., Mong, B., Moore, D., Nelson, R., Odian, A., Ostrovskiy, I., Ouellet, C., Piepke, A., Pocar, A., Prescott, C. Y., Rivas, A., Rowson, P. C., Rozo, M. P., Russell, J. J., Schubert, A., Sinclair, D., Slutsky, S., Smith, E., Stekhanov, V., Tarka, M., Tolba, T., Tosi, D., Twelker, K., Vogel, P., Vuilleumier, J. -L., Waite, A., Walton, J., Walton, T., Weber, M., Wen, L. J., Wichoski, U., Wright, J. D., Yang, L., Yen, Y. -R., Zeldovich, O. Ya., and Zhao, Y. B.
Subjects: Nuclear Experiment, High Energy Physics - Experiment, Physics - Instrumentation and Detectors
Abstract: Many extensions of the Standard Model of particle physics suggest that neutrinos should be Majorana-type fermions, but this assumption is difficult to confirm. Observation of neutrinoless double-beta decay ($0\nu \beta \beta$), a spontaneous transition that may occur in several candidate nuclei, would verify the Majorana nature of the neutrino and constrain the absolute scale of the neutrino mass spectrum. Recent searches carried out with $^{76}$Ge (GERDA experiment) and $^{136}$Xe (KamLAND-Zen and EXO-200 experiments) have established the lifetime of this decay to be longer than $10^{25}$ yr, corresponding to a limit on the neutrino mass of 0.2-0.4 eV. Here we report new results from EXO-200 based on 100 kg$\cdot$yr of $^{136}$Xe exposure, representing an almost fourfold increase from our earlier published datasets. We have improved the detector resolution at the $^{136}$Xe double-beta-decay Q-value to $\sigma$/E = 1.53% and revised the data analysis. The obtained half-life sensitivity is $1.9\cdot10^{25}$ yr, an improvement by a factor of 2.7 compared to previous EXO-200 results. We find no statistically significant evidence for $0\nu \beta \beta$ decay and set a half-life limit of $1.1\cdot10^{25}$ yr at 90% CL. The high sensitivity holds promise for further running of the EXO-200 detector and future $0\nu \beta \beta$ decay searches with nEXO., Comment: 9 pages, 6 figures
Published: 2014
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23. An RF-only ion-funnel for extraction from high-pressure gases

Author: Brunner, T., Fudenberg, D., Varentsov, V., Sabourov, A., Gratta, G., Dilling, J., DeVoe, R., Sinclair, D., Fairbank, W., Jr., Albert, J.B., Auty, D.J., Barbeau, P.S., Beck, D., Benitez-Medina, C., Breidenbach, M., Cao, G.F., Chambers, C., Cleveland, B., Coon, M., Craycraft, A., Daniels, T., Daugherty, S.J., Didberidze, T., Dolinski, M.J., Dunford, M., Fabris, L., Farine, J., Feldmeier, W., Fierlinger, P., Gornea, R., Graham, K., Heffner, M., Hughes, M., Jewell, M., Jiang, X.S., Johnson, T.N., Johnston, S., Karelin, A., Kaufman, L.J., Killick, R., Koffas, T., Kravitz, S., Krücken, R., Kuchenkov, A., Kumar, K.S., Leonard, D.S., Leonard, F., Licciardi, C., Lin, Y.H., Ling, J., MacLellan, R., Marino, M.G., Mong, B., Moore, D., Odian, A., Ostrovskiy, I., Ouellet, C., Piepke, A., Pocar, A., Retiere, F., Rowson, P.C., Rozo, M.P., Schubert, A., Smith, E., Stekhanov, V., Tarka, M., Tolba, T., Tosi, D., Twelker, K., Vuilleumier, J.-L., Walton, J., Walton, T., Weber, M., Wen, L.J., Wichoski, U., Yang, L., and Yen, Y.-R.
Published: 2015
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24. The EXO-200 detector, part II: auxiliary systems

Author: Ackerman, N., additional, Albert, J., additional, Auger, M., additional, Auty, D.J., additional, Badhrees, I., additional, Barbeau, P.S., additional, Bartoszek, L., additional, Baussan, E., additional, Belov, V., additional, Benitez-Medina, C., additional, Bhatta, T., additional, Breidenbach, M., additional, Brunner, T., additional, Cao, G.F., additional, Cen, W.R., additional, Chambers, C., additional, Cleveland, B., additional, Conley, R., additional, Cook, S., additional, Coon, M., additional, Craddock, W., additional, Craycraft, A., additional, Cree, W., additional, Daniels, T., additional, Darroch, L., additional, Daugherty, S.J., additional, Daughhetee, J., additional, Davis, C.G., additional, Davis, J., additional, Delaquis, S., additional, Der Mesrobian-Kabakian, A., additional, deVoe, R., additional, Didberidze, T., additional, Dilling, J., additional, Dobi, A., additional, Dolgolenko, A.G., additional, Dolinski, M.J., additional, Dunford, M., additional, Echevers, J., additional, Espic, L., additional, Fairbank, W., additional, Fairbank, D., additional, Farine, J., additional, Feldmeier, W., additional, Feyzbakhsh, S., additional, Fierlinger, P., additional, Fouts, K., additional, Franco, D., additional, Freytag, D., additional, Fudenberg, D., additional, Gautam, P., additional, Giroux, G., additional, Gornea, R., additional, Graham, K., additional, Gratta, G., additional, Hagemann, C., additional, Hall, C., additional, Hall, K., additional, Haller, G., additional, Hansen, E.V., additional, Hargrove, C., additional, Herbst, R., additional, Herrin, S., additional, Hodgson, J., additional, Hughes, M., additional, Iverson, A., additional, Jamil, A., additional, Jessiman, C., additional, Jewell, M.J., additional, Johnson, A., additional, Johnson, T.N., additional, Johnston, S., additional, Karelin, A., additional, Kaufman, L.J., additional, Killick, R., additional, Koffas, T., additional, Kravitz, S., additional, Krücken, R., additional, Kuchenkov, A., additional, Kumar, K.S., additional, Lan, Y., additional, Larson, A., additional, Leonard, D.S., additional, Leonard, F., additional, LePort, F., additional, Li, G.S., additional, Li, S., additional, Li, Z., additional, Licciardi, C., additional, Lin, Y.H., additional, Mackay, D., additional, MacLellan, R., additional, Marino, M., additional, Martin, J.-M., additional, Martin, Y., additional, McElroy, T., additional, McFarlane, K., additional, Michel, T., additional, Mong, B., additional, Moore, D.C., additional, Murray, K., additional, Neilson, R., additional, Nelson, R., additional, Njoya, O., additional, Nusair, O., additional, O'Sullivan, K., additional, Odian, A., additional, Ostrovskiy, I., additional, Ouellet, C., additional, Piepke, A., additional, Pocar, A., additional, Prescott, C.Y., additional, Pushkin, K., additional, Retiere, F., additional, Rivas, A., additional, Robinson, A.L., additional, Rollin, E., additional, Rowson, P.C., additional, Rozo, M.P., additional, Runge, J., additional, Russell, J.J., additional, Schmidt, S., additional, Schubert, A., additional, Sinclair, D., additional, Skarpaas, K., additional, Slutsky, S., additional, Smith, E., additional, Soma, A.K., additional, Stekhanov, V., additional, Strickland, V., additional, Swift, M., additional, Tarka, M., additional, Todd, J., additional, Tolba, T., additional, Tosi, D., additional, Totev, T.I., additional, Tsang, R., additional, Twelker, K., additional, Veenstra, B., additional, Veeraraghavan, V., additional, Vuilleumier, J.-L., additional, Vuilleumier, J.-M., additional, Wagenpfeil, M., additional, Waite, A., additional, Walton, J., additional, Walton, T., additional, Wamba, K., additional, Watkins, J., additional, Weber, M., additional, Wen, L.J., additional, Wichoski, U., additional, Wittgen, M., additional, Wodin, J., additional, Wood, J., additional, Wrede, G., additional, Wu, S.X., additional, Xia, Q., additional, Yang, L., additional, Yen, Y.-R., additional, Zeldovich, O.Ya., additional, and Ziegler, T., additional
Published: 2022
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25. Search for Majorana neutrinos with the first two years of EXO-200 data

Author: Albert, J. B., Auty, D. J., Barbeau, P. S., Beauchamp, E., Beck, D., Belov, V., Benitez-Medina, C., Bonatt, J., Breidenbach, M., Brunner, T., Burenkov, A., Cao, G. F., Chambers, C., Chaves, J., Cleveland, B., Coon, M., Craycraft, A., Daniels, T., Danilov, M., Daugherty, S. J., Davis, C. G., Davis, J., DeVoe, R., Delaquis, S., Didberidze, T., Dolgolenko, A., Dolinski, M. J., Dunford, M., Fairbank, W., Jr, Farine, J., Feldmeier, W., Fierlinger, P., Fudenberg, D., Giroux, G., Gornea, R., Graham, K., Gratta, G., Hall, C., Herrin, S., Hughes, M., Jewell, M. J., Jiang, X. S., Johnson, A., Johnson, T. N., Johnston, S., Karelin, A., Kaufman, L. J., Killick, R., Koffas, T., Kravitz, S., Kuchenkov, A., Kumar, K. S., Leonard, D. S., Leonard, F., Licciardi, C., Lin, Y. H., MacLellan, R., Marino, M. G., Mong, B., Moore, D., Nelson, R., Odian, A., Ostrovskiy, I., Ouellet, C., Piepke, A., Pocar, A., Prescott, C. Y., Rivas, A., Rowson, P. C., Rozo, M. P., Russell, J. J., Schubert, A., Sinclair, D., Slutsky, S., Smith, E., Stekhanov, V., Tarka, M., Tolba, T., Tosi, D., Twelker, K., Vogel, P., Vuilleumier, J.-L., Waite, A., Walton, J., Walton, T., Weber, M., Wen, L. J., Wichoski, U., Wright, J. D., Yang, L., Yen, Y.-R., Ya. Zeldovich, O., and Zhao, Y. B.
Published: 2014
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26. Thermal-collisional mechanism of hot electron capture in strong crossed electromagnetic fields

Author: Kachlishvili, Z. S., Khizanishvili, É. G., Khizanishvili, M. G., and Didberidze, T. O.
Published: 2007
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27. GEANT4 models of HPGe detectors for radioassay

Author: Tsang, R.H.M., primary, Piepke, A., additional, Auty, D.J., additional, Cleveland, B., additional, Delaquis, S., additional, Didberidze, T., additional, MacLellan, R., additional, Meng, Y., additional, Nusair, O., additional, and Tolba, T., additional
Published: 2019
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28. Searches for Double Beta Decay of $^{134}$Xe with EXO-200

Author: 200 Collaboration, Albert, J. B., Anton, G., Badhrees, I., Barbeau, P. S., Bayerlein, R., Beck, D., Belov, V., Breidenbach, M., Brunner, T., Cao, G. F., Cen, W. R., Chambers, C., Cleveland, B., Coon, M., Craycraft, A., Cree, W., Daniels, T., Danilov, M., Daugherty, S. J., Daughhetee, J., Davis, J., Delaquis, S., Der Mesrobian-Kabakian, A., DeVoe, R., Didberidze, T., Dilling, J., Dolgolenko, A., Dolinski, M. J., Fairbank, W., Farine, J., Feyzbakhsh, S., Fierlinger, P., Fudenberg, D., Gornea, R., Graham, K., Gratta, G., Hall, C., Hoessl, J., Hufschmidt, P., Hughes, M., Jamil, A., Jewell, M. J., Johnson, A., Johnston, S., Karelin, A., Kaufman, L. J., Koffas, T., Kravitz, S., Kr��cken, R., Kuchenkov, A., Kumar, K. S., Lan, Y., Leonard, D. S., Li, S., Licciardi, C., Lin, Y. H., MacLellan, R., Marino, M. G., Michel, T., Mong, B., Moore, D., Murray, K., Nelson, R., Njoya, O., Odian, A., Ostrovskiy, I., Piepke, A., Pocar, A., Reti��re, F., Rowson, P. C., Russell, J. J., Schubert, A., Sinclair, D., Smith, E., Stekhanov, V., Tarka, M., Tolba, T., Tsang, R., Vogel, P., Vuilleumier, J. -L., Wagenpfeil, M., Waite, A., Walton, J., Walton, T., Weber, M., Wen, L. J., Wichoski, U., Yang, L., Yen, Y. -R., Zeldovich, O. Ya., Zettlemoyer, J., and Ziegler, T.
Subjects: High Energy Physics - Experiment (hep-ex), FOS: Physical sciences, Nuclear Experiment (nucl-ex), Nuclear Experiment, High Energy Physics - Experiment
Abstract: Searches for double beta decay of $^{134}$Xe were performed with EXO-200, a single-phase liquid xenon detector designed to search for neutrinoless double beta decay of $^{136}$Xe. Using an exposure of $29.6\text{ kg}\!\cdot\!\text{yr}$, the lower limits of $\text{T}_{1/2}^{2\nu\beta\!\beta}>8.7\cdot10^{20}\text{ yr}$ and $\text{T}_{1/2}^{0\nu\beta\!\beta}>1.1\cdot10^{23}\text{ yr}$ at 90% confidence level were derived, with corresponding half-life sensitivities of $1.2\cdot10^{21}\text{ yr}$ and $1.9\cdot10^{23}\text{ yr}$. These limits exceed those in the literature for $^{134}$Xe, improving by factors of nearly $10^{5}$ and 2 for the two antineutrino and neutrinoless modes, respectively., Comment: 8 pages, 4 figures
Published: 2017

29. Measurement of the drift velocity and transverse diffusion of electrons in liquid xenon with the EXO-200 detector

Author: 200 Collaboration, Albert, J. B., Barbeau, P. S., Beck, D., Belov, V., Breidenbach, M., Brunner, T., Burenkov, A., Cao, G. F., Cen, W. R., Chambers, C., Cleveland, B., Coon, M., Craycraft, A., Daniels, T., Danilov, M., Daugherty, S. J., Daughhetee, J., Davis, J., Delaquis, S., Der Mesrobian-Kabakian, A., DeVoe, R., Didberidze, T., Dilling, J., Dolgolenko, A., Dolinski, M. J., Dunford, M., Fairbank, W., Farine, J., Feyzbakhsh, S., Fierlinger, P., Fudenberg, D., Gornea, R., Graham, K., Gratta, G., Hall, C., Hughes, M., Jewell, M. J., Johnson, A., Johnson, T. N., Johnston, S., Karelin, A., Kaufman, L. J., Killick, R., Koffas, T., Kravitz, S., Krucken, R., Kuchenkov, A., Kumar, K. S., Lan, Y., Leonard, D. S., Licciardi, C., Lin, Y. H., MacLellan, R., Marino, M. G., Mong, B., Moore, D., Njoya, O., Nelson, R., Odian, A., Ostrovskiy, I., Piepke, A., Pocar, A., Prescott, C. Y., Retiere, F., Rowson, P. C., Russell, J. J., Schubert, A., Sinclair, D., Smith, E., Stekhanov, V., Tarka, M., Tolba, T., Tsang, R., Twelker, K., Vuilleumier, J. -L., Waite, A., Walton, J., Walton, T., Weber, M., Wen, L. J., Wichoski, U., Wood, J., Yang, L., Yen, Y. -R., Zeldovich, O. Ya., and Zettlemoyer, J.
Subjects: Physics, Physics - Instrumentation and Detectors, Time projection chamber, Drift velocity, Field (physics), 010308 nuclear & particles physics, FOS: Physical sciences, chemistry.chemical_element, Charge (physics), Instrumentation and Detectors (physics.ins-det), Electron, 01 natural sciences, 7. Clean energy, Fick's laws of diffusion, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), Xenon, chemistry, 0103 physical sciences, Atomic physics, Diffusion (business), 010306 general physics
Abstract: The EXO-200 Collaboration is searching for neutrinoless double beta decay using a liquid xenon (LXe) time projection chamber. This measurement relies on modeling the transport of charge deposits produced by interactions in the LXe to allow discrimination between signal and background events. Here we present measurements of the transverse diffusion constant and drift velocity of electrons at drift fields between 20~V/cm and 615~V/cm using EXO-200 data. At the operating field of 380~V/cm EXO-200 measures a drift velocity of 1.705$_{-0.010}^{+0.014}$~mm/$\mu$s and a transverse diffusion coefficient of 55$\pm$4~cm$^2$/s., Comment: 9 pages, 7 figures, added minor clarifications recommended by the reviewer on E-field non-uniformities, minor edits to formatting of figures to conform with journal requirements
Published: 2017
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30. Search for nucleon decays with EXO-200

Author: Albert, J.B. (J. B.), Anton, G. (G.), Badhrees, I. (I.), Barbeau, P.S. (P. S.), Bayerlein, R. (R.), Beck, D. (D.), Belov, V. (V.), Breidenbach, M. (M.), Brunner, T. (T.), Cao, G.F. (G. F.), Cen, W.R. (W. R.), Chambers, C. (C.), Cleveland, B. (B.), Coon, M. (M.), Craycraft, A. (A.), Cree, W. (W.), Daniels, T. (T.), Danilov, M. (M.), Daugherty, S.J. (S. J.), Daughhetee, J. (J.), Davis, J. (J.), Delaquis, S. (S.), Der Mesrobian-Kabakian, A. (A.), Devoe, R. (R.), Didberidze, T. (T.), Dilling, J. (J.), Dolgolenko, A. (A.), Dolinski, M.J. (M. J.), Fairbank, W. (W.), Farine, J. (J.), Feyzbakhsh, S. (S.), Fierlinger, P. (P.), Fudenberg, D. (D.), Gornea, R.S. (Razvan Stefan), Graham, K. (K.), Gratta, G. (G.), Hall, C. (C.), Hansen, E.V. (E. V.), Hoessl, J. (J.), Homiller, S. (S.), Hufschmidt, P. (P.), Hughes, M. (M.), Jamil, A. (A.), Jewell, M.J. (M. J.), Johnson, A. (A.), Johnston, S. (S.), Karelin, A. (A.), Kaufman, L.J. (L. J.), Koffas, T. (Thomas), Kravitz, S. (S.), Krücken, R. (R.), Kuchenkov, A. (A.), Kumar, K.S. (K. S.), Lan, Y. (Y.), Leonard, D.S. (D. S.), Li, G.S. (G. S.), Li, S. (S.), Licciardi, C. (C.), Lin, Y.H. (Y. H.), Maclellan, R. (R.), Michel, T. (T.), Mong, B. (B.), Moore, D. (D.), Murray, K. (K.), Nelson, R. (R.), Njoya, O. (O.), Odian, A. (A.), Ostrovskiy, I. (I.), Piepke, A. (A.), Pocar, A. (A.), Retière, F. (F.), Robinson, A.L. (A. L.), Rowson, P.C. (P. C.), Schmidt, S. (S.), Schubert, A. (A.), Sinclair, D. (D.), Soma, A.K. (A. K.), Stekhanov, V. (V.), Tarka, M. (M.), Tolba, T. (T.), Tsang, R. (R.), Vogel, P. (P.), Vuilleumier, J.-L. (J. L.), Wagenpfeil, M. (M.), Waite, A. (A.), Walton, T. (T.), Weber, M. (M.), Wen, L.J. (L. J.), Wichoski, U. (U.), Wrede, G. (G.), Yang, L. (L.), Yen, Y.-R. (Y. R.), Zeldovich, O.Ya. (O. Ya), Zettlemoyer, J. (J.), Ziegler, T. (T.), Albert, J.B. (J. B.), Anton, G. (G.), Badhrees, I. (I.), Barbeau, P.S. (P. S.), Bayerlein, R. (R.), Beck, D. (D.), Belov, V. (V.), Breidenbach, M. (M.), Brunner, T. (T.), Cao, G.F. (G. F.), Cen, W.R. (W. R.), Chambers, C. (C.), Cleveland, B. (B.), Coon, M. (M.), Craycraft, A. (A.), Cree, W. (W.), Daniels, T. (T.), Danilov, M. (M.), Daugherty, S.J. (S. J.), Daughhetee, J. (J.), Davis, J. (J.), Delaquis, S. (S.), Der Mesrobian-Kabakian, A. (A.), Devoe, R. (R.), Didberidze, T. (T.), Dilling, J. (J.), Dolgolenko, A. (A.), Dolinski, M.J. (M. J.), Fairbank, W. (W.), Farine, J. (J.), Feyzbakhsh, S. (S.), Fierlinger, P. (P.), Fudenberg, D. (D.), Gornea, R.S. (Razvan Stefan), Graham, K. (K.), Gratta, G. (G.), Hall, C. (C.), Hansen, E.V. (E. V.), Hoessl, J. (J.), Homiller, S. (S.), Hufschmidt, P. (P.), Hughes, M. (M.), Jamil, A. (A.), Jewell, M.J. (M. J.), Johnson, A. (A.), Johnston, S. (S.), Karelin, A. (A.), Kaufman, L.J. (L. J.), Koffas, T. (Thomas), Kravitz, S. (S.), Krücken, R. (R.), Kuchenkov, A. (A.), Kumar, K.S. (K. S.), Lan, Y. (Y.), Leonard, D.S. (D. S.), Li, G.S. (G. S.), Li, S. (S.), Licciardi, C. (C.), Lin, Y.H. (Y. H.), Maclellan, R. (R.), Michel, T. (T.), Mong, B. (B.), Moore, D. (D.), Murray, K. (K.), Nelson, R. (R.), Njoya, O. (O.), Odian, A. (A.), Ostrovskiy, I. (I.), Piepke, A. (A.), Pocar, A. (A.), Retière, F. (F.), Robinson, A.L. (A. L.), Rowson, P.C. (P. C.), Schmidt, S. (S.), Schubert, A. (A.), Sinclair, D. (D.), Soma, A.K. (A. K.), Stekhanov, V. (V.), Tarka, M. (M.), Tolba, T. (T.), Tsang, R. (R.), Vogel, P. (P.), Vuilleumier, J.-L. (J. L.), Wagenpfeil, M. (M.), Waite, A. (A.), Walton, T. (T.), Weber, M. (M.), Wen, L.J. (L. J.), Wichoski, U. (U.), Wrede, G. (G.), Yang, L. (L.), Yen, Y.-R. (Y. R.), Zeldovich, O.Ya. (O. Ya), Zettlemoyer, J. (J.), and Ziegler, T. (T.)
Abstract: A search for instability of nucleons bound in Xe136 nuclei is reported with 223 kg·yr exposure of Xe136 in the EXO-200 experiment. Lifetime limits of 3.3×1023 and 1.9×1023 yr are established for nucleon decay to Sb133 and Te133, respectively. These are the most stringent to date, exceeding the prior decay limits by a factor of 9 and 7, respectively.
Published: 2018
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31. First search for Lorentz andCPTviolation in double beta decay with EXO-200

Author: 200 Collaboration, Albert, J. B., Barbeau, P. S., Beck, D., Belov, V., Breidenbach, M., Brunner, T., Burenkov, A., Cao, G. F., Chambers, C., Cleveland, B., Coon, M., Craycraft, A., Daniels, T., Danilov, M., Daugherty, S. J., Davis, C. G., Davis, J., Delaquis, S., Der Mesrobian-Kabakian, A., DeVoe, R., D��az, J. S., Didberidze, T., Dilling, J., Dolgolenko, A., Dolinski, M. J., Dunford, M., Fairbank, W., Farine, J., Feyzbkhsh, S., Feldmeier, W., Fierlinger, P., Fudenberg, D., Gornea, R., Graham, K., Gratta, G., Hall, C., Homiller, S., Hughes, M., Jewell, M. J., Jiang, X. S., Johnson, A., Johnson, T. N., Johnston, S., Karelin, A., Kaufman, L. J., Killick, R., Koffas, T., Kravitz, S., Kr��cken, R., Kuchenkov, A., Kumar, K. S., Leonard, D. S., Lin, Y. H., Ling, J., MacLellan, R., Marino, M. G., Mong, B., Moore, D., Nelson, R., Njoya, O., Odian, A., Ostrovskiy, I., Piepke, A., Pocar, A., Prescott, C. Y., Reti��re, F., Rowson, P. C., Russell, J. J., Schubert, A., Sinclair, D., Smith, E., Stekhanov, V., Tarka, M., Tolba, T., Tsang, R., Twelker, K., Vuilleumier, J. -L., Vogel, P., Waite, A., Walton, J., Walton, T., Weber, M., Wen, L. J., Wichoski, U., Wood, J., Yang, L., Yen, Y. -R., and Zeldovich, O. Ya.
Subjects: Physics, Particle physics, 010308 nuclear & particles physics, CPT symmetry, Physics beyond the Standard Model, Lorentz transformation, Isotropy, Detector, FOS: Physical sciences, 01 natural sciences, Nuclear physics, High Energy Physics - Phenomenology, symbols.namesake, High Energy Physics - Phenomenology (hep-ph), Phase space, Double beta decay, 0103 physical sciences, symbols, High Energy Physics::Experiment, Nuclear Experiment (nucl-ex), Neutrino, 010306 general physics, Nuclear Experiment
Abstract: A search for Lorentz- and CPT-violating signals in the double beta decay spectrum of $^{136}$Xe has been performed using an exposure of 100 kg$\cdot$yr with the EXO-200 detector. No significant evidence of the spectral modification due to isotropic Lorentz-violation was found, and a two-sided limit of $-2.65 \times 10^{-5 } \; \textrm{GeV} < \mathring{a}^{(3)}_{\text{of}} < 7.60 \times 10^{-6} \; \textrm{GeV}$ (90% C.L.) is placed on the relevant coefficient within the Standard-Model Extension (SME). This is the first experimental study of the effect of the SME-defined oscillation-free and momentum-independent neutrino coupling operator on the double beta decay process., 6 pages, 3 figures
Published: 2016
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32. Characterization of an Ionization Readout Tile for nEXO

Author: Jewell, M., primary, Schubert, A., additional, Cen, W.R., additional, Dalmasson, J., additional, DeVoe, R., additional, Fabris, L., additional, Gratta, G., additional, Jamil, A., additional, Li, G., additional, Odian, A., additional, Patel, M., additional, Pocar, A., additional, Qiu, D., additional, Wang, Q., additional, Wen, L.J., additional, Albert, J.B., additional, Anton, G., additional, Arnquist, I.J., additional, Badhrees, I., additional, Barbeau, P., additional, Beck, D., additional, Belov, V., additional, Bourque, F., additional, Brodsky, J. P., additional, Brown, E., additional, Brunner, T., additional, Burenkov, A., additional, Cao, G.F., additional, Cao, L., additional, Chambers, C., additional, Charlebois, S.A., additional, Chiu, M., additional, Cleveland, B., additional, Coon, M., additional, Craycraft, A., additional, Cree, W., additional, Côté, M., additional, Daniels, T., additional, Daugherty, S.J., additional, Daughhetee, J., additional, Delaquis, S., additional, Mesrobian-Kabakian, A. Der, additional, Didberidze, T., additional, Dilling, J., additional, Ding, Y.Y., additional, Dolinski, M.J., additional, Dragone, A., additional, Fairbank, W., additional, Farine, J., additional, Feyzbakhsh, S., additional, Fontaine, R., additional, Fudenberg, D., additional, Giacomini, G., additional, Gornea, R., additional, Hansen, E.V., additional, Harris, D., additional, Hasan, M., additional, Heffner, M., additional, Hoppe, E. W., additional, House, A., additional, Hufschmidt, P., additional, Hughes, M., additional, Hößl, J., additional, Ito, Y., additional, Iverson, A., additional, Jiang, X.S., additional, Johnston, S., additional, Karelin, A., additional, Kaufman, L.J., additional, Koffas, T., additional, Kravitz, S., additional, Krücken, R., additional, Kuchenkov, A., additional, Kumar, K.S., additional, Lan, Y., additional, Leonard, D.S., additional, Li, S., additional, Li, Z., additional, Licciardi, C., additional, Lin, Y.H., additional, MacLellan, R., additional, Michel, T., additional, Mong, B., additional, Moore, D., additional, Murray, K., additional, Newby, R.J., additional, Ning, Z., additional, Njoya, O., additional, Nolet, F., additional, Odgers, K., additional, Oriunno, M., additional, Orrell, J.L., additional, Ostrovskiy, I., additional, Overman, C.T., additional, Ortega, G. S., additional, Parent, S., additional, Piepke, A., additional, Pratte, J.-F., additional, Radeka, V., additional, Raguzin, E., additional, Rao, T., additional, Rescia, S., additional, Retiere, F., additional, Robinson, A., additional, Rossignol, T., additional, Rowson, P.C., additional, Roy, N., additional, Saldanha, R., additional, Sangiorgio, S., additional, Schmidt, S., additional, Schneider, J., additional, Sinclair, D., additional, Skarpaas, K., additional, Soma, A.K., additional, St-Hilaire, G., additional, Stekhanov, V., additional, Stiegler, T., additional, Sun, X.L., additional, Tarka, M., additional, Todd, J., additional, Tolba, T., additional, Tsang, R., additional, Tsang, T., additional, Vachon, F., additional, Veeraraghavan, V., additional, Visser, G., additional, Vuilleumier, J.-L., additional, Wagenpfeil, M., additional, Weber, M., additional, Wei, W., additional, Wichoski, U., additional, Wrede, G., additional, Wu, S.X., additional, Wu, W.H., additional, Yang, L., additional, Yen, Y.-R., additional, Zeldovich, O., additional, Zhang, X., additional, Zhao, J., additional, Zhou, Y., additional, and Ziegler, T., additional
Published: 2018
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33. Trace radioactive impurities in final construction materials for EXO-200

Author: Leonard, D.S., primary, Auty, D.J., additional, Didberidze, T., additional, Gornea, R., additional, Grinberg, P., additional, MacLellan, R., additional, Methven, B., additional, Piepke, A., additional, Vuilleumier, J.-L., additional, Albert, J.B., additional, Anton, G., additional, Badhrees, I., additional, Barbeau, P.S., additional, Bayerlein, R., additional, Beck, D., additional, Belov, V., additional, Breidenbach, M., additional, Brunner, T., additional, Cao, G.F., additional, Cen, W.R., additional, Chambers, C., additional, Cleveland, B., additional, Coon, M., additional, Craycraft, A., additional, Cree, W., additional, Daniels, T., additional, Danilov, M., additional, Daugherty, S.J., additional, Daughhetee, J., additional, Davis, J., additional, Delaquis, S., additional, Mesrobian-Kabakian, A. Der, additional, DeVoe, R., additional, Dilling, J., additional, Dolgolenko, A., additional, Dolinski, M.J., additional, Fairbank, W., additional, Farine, J., additional, Feyzbakhsh, S., additional, Fierlinger, P., additional, Fudenberg, D., additional, Graham, K., additional, Gratta, G., additional, Hall, C., additional, Herrin, S., additional, Hoessl, J., additional, Hufschmidt, P., additional, Hughes, M., additional, Jamil, A., additional, Jewell, M.J., additional, Johnson, A., additional, Johnston, S., additional, Karelin, A., additional, Kaufman, L.J., additional, Koffas, T., additional, Kravitz, S., additional, Krücken, R., additional, Kuchenkov, A., additional, Kumar, K.S., additional, Lan, Y., additional, LePort, F., additional, Li, S., additional, Licciardi, C., additional, Lin, Y.H., additional, Mackay, D., additional, Marino, M.G., additional, Michel, T., additional, Mong, B., additional, Moore, D., additional, Murray, K., additional, Neilson, R., additional, Nelson, R., additional, Njoya, O., additional, Odian, A., additional, Ostrovskiy, I., additional, Pocar, A., additional, Pushkin, K., additional, Retière, F., additional, Rowson, P.C., additional, Russell, J.J., additional, Schubert, A., additional, Sinclair, D., additional, Smith, E., additional, Stekhanov, V., additional, Tarka, M., additional, Tolba, T., additional, Tsang, R., additional, Wagenpfeil, M., additional, Waite, A., additional, Walton, J., additional, Walton, T., additional, Wamba, K., additional, Weber, M., additional, Wen, L.J., additional, Wichoski, U., additional, Wodin, J., additional, Yang, L., additional, Yen, Y.-R., additional, Zeldovich, O.Ya., additional, Zettlemoyer, J., additional, and Ziegler, T., additional
Published: 2017
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34. Search for $2��$ decay of $^{136}$Xe to the 0$_1^+$ excited state of $^{136}$Ba with EXO-200

Author: 200 Collaboration, Albert, J. B., Auty, D. J., Barbeau, P. S., Beck, D., Belov, V., Breidenbach, M., Brunner, T., Burenkov, A., Cao, G. F., Chambers, C., Chaves, J., Cleveland, B., Coon, M., Craycraft, A., Daniels, T., Danilov, M., Daugherty, S. J., Davis, J., Delaquis, S., Der Mesrobian-Kabakian, A., DeVoe, R., Didberidze, T., Dilling, J., Dolgolenko, A., Dolinski, M. J., Dunford, M., Fairbank, W., Farine, J., Feldmeier, W., Feyzbakhsh, S., Fierlinger, P., Fudenberg, D., Gornea, R., Graham, K., Gratta, G., Hall, C., Hughes, M., Jewell, M. J., Johnson, A., Johnson, T. N., Johnston, S., Karelin, A., Kaufman, L. J., Killick, R., King, J., Koffas, T., Kravitz, S., Kr��cken, R., Kuchenkov, A., Kumar, K. S., Leonard, D. S., Licciardi, C., Lin, Y. H., Ling, J., MacLellan, R., Marino, M. G., Mong, B., Moore, D., Njoya, O., Nelson, R., Odian, A., Ostrovskiy, I., Piepke, A., Pocar, A., Prescott, C. Y., Reti��re, F., Rowson, P. C., Russell, J. J., Schubert, A., Sinclair, D., Smith, E., Stekhanov, V., Tarka, M., Tolba, T., Tsang, R., Twelker, K., Vogel, P., Vuilleumier, J. -L., Waite, A., Walton, J., Walton, T., Weber, M., Wen, L. J., Wichoski, U., Winick, T. A., Wood, J., Xu, Q. Y., Yang, L., Yen, Y. -R., and Zeldovich, O. Ya.
Subjects: High Energy Physics - Experiment (hep-ex), FOS: Physical sciences, Nuclear Experiment (nucl-ex)
Abstract: EXO-200 is a single phase liquid xenon detector designed to search for neutrinoless double-beta decay of $^{136}$Xe to the ground state of $^{136}$Ba. We report here on a search for the two-neutrino double-beta decay of $^{136}$Xe to the first $0^+$ excited state, $0^+_1$, of $^{136}$Ba based on a 100 kg$\cdot$yr exposure of $^{136}$Xe. Using a specialized analysis employing a machine learning algorithm, we obtain a 90% CL half-life sensitivity of $1.7 \times 10^{24}$ yr. We find no statistically significant evidence for the $2��$ decay to the excited state resulting in a lower limit of $T^{2��}_{1/2}$ ($0^+ \rightarrow 0^+_1$) $> 6.9 \times 10^{23}$ yr at 90% CL. This observed limit is consistent with the estimated half-life of $2.5\times10^{25}$ yr., 10 pages, 7 figures, 2 tables
Published: 2015
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35. Cosmogenic Backgrounds to 0�� in EXO-200

Author: 200 Collaboration, Albert, J. B., Auty, D. J., Barbeau, P. S., Beck, D., Belov, V., Breidenbach, M., Brunner, T., Burenkov, A., Cao, G. F., Chambers, C., Cleveland, B., Coon, M., Craycraft, A., Daniels, T., Danilov, M., Daugherty, S. J., Davis, J., Delaquis, S., Der Mesrobian-Kabakian, A., DeVoe, R., Didberidze, T., Dilling, J., Dolgolenko, A., Dolinski, M. J., Dunford, M., Fairbank, W., Farine, J., Feldmeier, W., Feyzbakhsh, S., Fierlinger, P., Fudenberg, D., Gornea, R., Graham, K., Gratta, G., Hall, C., Herrin, S., Hughes, M., Jewell, M. J., Johnson, A., Johnson, T. N., Johnston, S., Karelin, A., Kaufman, L. J., Killick, R., Koffas, T., Kravitz, S., Kr��cken, R., Kuchenkov, A., Kumar, K. S., Leonard, D. S., Licciardi, C., Lin, Y. H., Ling, J., MacLellan, R., Marino, M. G., Mong, B., Moore, D., Njoya, O., Nelson, R., Odian, A., Ostrovskiy, I., Piepke, A., Pocar, A., Prescott, C. Y., Reti��re, F., Rowson, P. C., Russell, J. J., Schubert, A., Sinclair, D., Smith, E., Stekhanov, V., Tarka, M., Tolba, T., Tsang, R., Twelker, K., Vuilleumier, J. -L., Waite, A., Walton, J., Walton, T., Weber, M., Wen, L. J., Wichoski, U., Wood, J., Yang, L., Yen, Y. -R., and Zeldovich, O. Ya.
Subjects: High Energy Physics - Experiment (hep-ex), FOS: Physical sciences, Instrumentation and Detectors (physics.ins-det), Nuclear Experiment (nucl-ex)
Abstract: As neutrinoless double-beta decay experiments become more sensitive and intrinsic radioactivity in detector materials is reduced, previously minor contributions to the background must be understood and eliminated. With this in mind, cosmogenic backgrounds have been studied with the EXO-200 experiment. Using the EXO-200 TPC, the muon flux (through a flat horizontal surface) underground at the Waste Isolation Pilot Plant (WIPP) has been measured to be �� = 4.07 $\pm$ 0.14 (sys) $\pm$ 0.03 (stat) $\times$ $10^{-7}$cm$^{-2}$ s$^{-1}$, with a vertical intensity of $I_{v}$ = 2.97$^{+0.14}_{-0.13}$ (sys) $\pm$ 0.02 (stat) $\times$ $10^{-7}$cm$^{-2}$ s$^{-1}$ sr$^{-1}$. Simulations of muon-induced backgrounds identified several potential cosmogenic radionuclides, though only 137Xe is a significant background for the 136Xe 0�� search with EXO-200. Muon-induced neutron backgrounds were measured using ��-rays from neutron capture on the detector materials. This provided a measurement of 137Xe yield, and a test of the accuracy of the neutron production and transport simulations. The independently measured rates of 136Xe neutron capture and of 137Xe decay agree within uncertainties. Geant4 and FLUKA simulations were performed to estimate neutron capture rates, and these estimates agreed to within ~40% or better with measurements. The ability to identify 136Xe(n,��) events will allow for rejection of 137Xe backgrounds in future 0�� analyses., Published in JCAP, 29 pages, 13 figures
Published: 2015
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36. Search for Majoron-emitting modes of double-beta decay of $^{136}$Xe with EXO-200

Author: 200 Collaboration, Albert, J. B., Auty, D. J., Barbeau, P. S., Beauchamp, E., Beck, D., Belov, V., Benitez-Medina, C., Breidenbach, M., Brunner, T., Burenkov, A., Cao, G. F., Chambers, C., Chaves, J., Cleveland, B., Coon, M., Craycraft, A., Daniels, T., Danilov, M., Daugherty, S. J., Davis, C. G., Davis, J., DeVoe, R., Delaquis, S., Didberidze, T., Dolgolenko, A., Dolinski, M. J., Dunford, M., Fairbank, W., Farine, J., Feldmeier, W., Fierlinger, P., Fudenberg, D., Giroux, G., Gornea, R., Graham, K., Gratta, G., Hall, C., Herrin, S., Hughes, M., Jewell, M. J., Jiang, X. S., Johnson, A., Johnson, T. N., Johnston, S., Karelin, A., Kaufman, L. J., Killick, R., Koffas, T., Kravitz, S., Kuchenkov, A., Kumar, K. S., Leonard, D. S., Leonard, F., Licciardi, C., Lin, Y. H., Ling, J., MacLellan, R., Marino, M. G., Mong, B., Moore, D., Nelson, R., Odian, A., Ostrovskiy, I., Ouellet, C., Piepke, A., Pocar, A., Prescott, C. Y., Rivas, A., Rowson, P. C., Rozo, M. P., Russell, J. J., Schubert, A., Sinclair, D., Smith, E., Stekhanov, V., Tarka, M., Tolba, T., Tosi, D., Tsang, R., Twelker, K., Vogel, P., Vuilleumier, J. -L., Waite, A., Walton, J., Walton, T., Weber, M., Wen, L. J., Wichoski, U., Yang, L., Yen, Y. -R., and Zeldovich, O. Ya.
Subjects: High Energy Physics - Experiment (hep-ex), Physics - Instrumentation and Detectors, FOS: Physical sciences, Instrumentation and Detectors (physics.ins-det), Nuclear Experiment (nucl-ex), Nuclear Experiment, High Energy Physics - Experiment
Abstract: EXO-200 is a single phase liquid xenon detector designed to search for neutrinoless double-beta decay of $^{136}$Xe. Here we report on a search for various Majoron-emitting modes based on 100 kg$\cdot$yr exposure of $^{136}$Xe. A lower limit of $T^{^{136}Xe}_{1/2} >1.2 \cdot 10^{24}$ yr at 90% C.L. on the half-life of the spectral index = 1 Majoron decay was obtained, corresponding to a constraint on the Majoron-neutrino coupling constant of $|< g^{M}_{ee} >, Comment: Published in PRD. Version 2: Referee comments addressed, journal reference added
Published: 2014

37. Search for Majorana neutrinos with the first two years of EXO-200 data

Author: 200 Collaboration, Albert, J. B., Auty, D. J., Barbeau, P. S., Beauchamp, E., Beck, D., Belov, V., Benitez-Medina, C., Bonatt, J., Breidenbach, M., Brunner, T., Burenkov, A., Cao, G. F., Chambers, C., Chaves, J., Cleveland, B., Coon, M., Craycraft, A., Daniels, T., Danilov, M., Daugherty, S. J., Davis, C. G., Davis, J., DeVoe, R., Delaquis, S., Didberidze, T., Dolgolenko, A., Dolinski, M. J., Dunford, M., Fairbank, W., Farine, J., Feldmeier, W., Fierlinger, P., Fudenberg, D., Giroux, G., Gornea, R., Graham, K., Gratta, G., Hall, C., Herrin, S., Hughes, M., Jewell, M. J., Jiang, X. S., Johnson, A., Johnson, T. N., Johnston, S., Karelin, A., Kaufman, L. J., Killick, R., Koffas, T., Kravitz, S., Kuchenkov, A., Kumar, K. S., Leonard, D. S., Leonard, F., Licciardi, C., Lin, Y. H., MacLellan, R., Marino, M. G., Mong, B., Moore, D., Nelson, R., Odian, A., Ostrovskiy, I., Ouellet, C., Piepke, A., Pocar, A., Prescott, C. Y., Rivas, A., Rowson, P. C., Rozo, M. P., Russell, J. J., Schubert, A., Sinclair, D., Slutsky, S., Smith, E., Stekhanov, V., Tarka, M., Tolba, T., Tosi, D., Twelker, K., Vogel, P., Vuilleumier, J. -L., Waite, A., Walton, J., Walton, T., Weber, M., Wen, L. J., Wichoski, U., Wright, J. D., Yang, L., Yen, Y. -R., Zeldovich, O. Ya., and Zhao, Y. B.
Subjects: Physics, Particle physics, Multidisciplinary, Time projection chamber, Physics - Instrumentation and Detectors, 010308 nuclear & particles physics, FOS: Physical sciences, Instrumentation and Detectors (physics.ins-det), 7. Clean energy, 01 natural sciences, Standard Model, High Energy Physics - Experiment, Nuclear physics, MAJORANA, High Energy Physics - Experiment (hep-ex), 0103 physical sciences, Mass spectrum, Limit (mathematics), Neutrino, Nuclear Experiment (nucl-ex), 010306 general physics, Enriched Xenon Observatory, Absolute scale, Nuclear Experiment
Abstract: Many extensions of the Standard Model of particle physics suggest that neutrinos should be Majorana-type fermions, but this assumption is difficult to confirm. Observation of neutrinoless double-beta decay ($0\nu \beta \beta$), a spontaneous transition that may occur in several candidate nuclei, would verify the Majorana nature of the neutrino and constrain the absolute scale of the neutrino mass spectrum. Recent searches carried out with $^{76}$Ge (GERDA experiment) and $^{136}$Xe (KamLAND-Zen and EXO-200 experiments) have established the lifetime of this decay to be longer than $10^{25}$ yr, corresponding to a limit on the neutrino mass of 0.2-0.4 eV. Here we report new results from EXO-200 based on 100 kg$\cdot$yr of $^{136}$Xe exposure, representing an almost fourfold increase from our earlier published datasets. We have improved the detector resolution at the $^{136}$Xe double-beta-decay Q-value to $\sigma$/E = 1.53% and revised the data analysis. The obtained half-life sensitivity is $1.9\cdot10^{25}$ yr, an improvement by a factor of 2.7 compared to previous EXO-200 results. We find no statistically significant evidence for $0\nu \beta \beta$ decay and set a half-life limit of $1.1\cdot10^{25}$ yr at 90% CL. The high sensitivity holds promise for further running of the EXO-200 detector and future $0\nu \beta \beta$ decay searches with nEXO., Comment: 9 pages, 6 figures
Published: 2014

38. Cosmogenic backgrounds to 0νββ in EXO-200

Author: Albert, J.B., primary, Auty, D.J., additional, Barbeau, P.S., additional, Beck, D., additional, Belov, V., additional, Breidenbach, M., additional, Brunner, T., additional, Burenkov, A., additional, Cao, G.F., additional, Chambers, C., additional, Cleveland, B., additional, Coon, M., additional, Craycraft, A., additional, Daniels, T., additional, Danilov, M., additional, Daugherty, S.J., additional, Davis, J., additional, Delaquis, S., additional, Mesrobian-Kabakian, A. Der, additional, DeVoe, R., additional, Didberidze, T., additional, Dilling, J., additional, Dolgolenko, A., additional, Dolinski, M.J., additional, Dunford, M., additional, Jr., W. Fairbank, additional, Farine, J., additional, Feldmeier, W., additional, Feyzbakhsh, S., additional, Fierlinger, P., additional, Fudenberg, D., additional, Gornea, R., additional, Graham, K., additional, Gratta, G., additional, Hall, C., additional, Herrin, S., additional, Hughes, M., additional, Jewell, M.J., additional, Johnson, A., additional, Johnson, T.N., additional, Johnston, S., additional, Karelin, A., additional, Kaufman, L.J., additional, Killick, R., additional, Koffas, T., additional, Kravitz, S., additional, Krücken, R., additional, Kuchenkov, A., additional, Kumar, K.S., additional, Leonard, D.S., additional, Licciardi, C., additional, Lin, Y.H., additional, Ling, J., additional, MacLellan, R., additional, Marino, M.G., additional, Mong, B., additional, Moore, D., additional, Njoya, O., additional, Nelson, R., additional, Odian, A., additional, Ostrovskiy, I., additional, Piepke, A., additional, Pocar, A., additional, Prescott, C.Y., additional, Retière, F., additional, Rowson, P.C., additional, Russell, J.J., additional, Schubert, A., additional, Sinclair, D., additional, Smith, E., additional, Stekhanov, V., additional, Tarka, M., additional, Tolba, T., additional, Tsang, R., additional, Twelker, K., additional, Vuilleumier, J.-L., additional, Waite, A., additional, Walton, J., additional, Walton, T., additional, Weber, M., additional, Wen, L.J., additional, Wichoski, U., additional, Wood, J., additional, Yang, L., additional, Yen, Y.-R., additional, and Zeldovich, O.Ya., additional
Published: 2016
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39. Characterization of Silicon Photomultipliers for nEXO

Author: Ostrovskiy, I., primary, Retiere, F., additional, Auty, D., additional, Dalmasson, J., additional, Didberidze, T., additional, DeVoe, R., additional, Gratta, G., additional, Huth, L., additional, James, L., additional, Lupin-Jimenez, L., additional, Ohmart, N., additional, and Piepke, A., additional
Published: 2015
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40. An apparatus to manipulate and identify individual Ba ions from bulk liquid Xe

Author: Twelker, K., primary, Kravitz, S., additional, Díez, M. Montero, additional, Gratta, G., additional, Fairbank, W., additional, Albert, J. B., additional, Auty, D. J., additional, Barbeau, P. S., additional, Beck, D., additional, Benitez-Medina, C., additional, Breidenbach, M., additional, Brunner, T., additional, Cao, G. F., additional, Chambers, C., additional, Cleveland, B., additional, Coon, M., additional, Craycraft, A., additional, Daniels, T., additional, Daugherty, S. J., additional, Davis, C. G., additional, DeVoe, R., additional, Delaquis, S., additional, Didberidze, T., additional, Dilling, J., additional, Dolinski, M. J., additional, Dunford, M., additional, Fabris, L., additional, Farine, J., additional, Feldmeier, W., additional, Fierlinger, P., additional, Fudenberg, D., additional, Giroux, G., additional, Gornea, R., additional, Graham, K., additional, Hall, C., additional, Heffner, M., additional, Herrin, S., additional, Hughes, M., additional, Jiang, X. S., additional, Johnson, T. N., additional, Johnston, S., additional, Karelin, A., additional, Kaufman, L. J., additional, Killick, R., additional, Koffas, T., additional, Krücken, R., additional, Kuchenkov, A., additional, Kumar, K. S., additional, Leonard, D. S., additional, Leonard, F., additional, Licciardi, C., additional, Lin, Y. H., additional, MacLellan, R., additional, Marino, M. G., additional, Mong, B., additional, Moore, D., additional, Odian, A., additional, Ostrovskiy, I., additional, Ouellet, C., additional, Piepke, A., additional, Pocar, A., additional, Retiere, F., additional, Rowson, P. C., additional, Rozo, M. P., additional, Schubert, A., additional, Sinclair, D., additional, Smith, E., additional, Stekhanov, V., additional, Tarka, M., additional, Tolba, T., additional, Tosi, D., additional, Vuilleumier, J.-L., additional, Walton, J., additional, Walton, T., additional, Weber, M., additional, Wen, L. J., additional, Wichoski, U., additional, Yang, L., additional, Yen, Y.-R., additional, and Zhao, Y. B., additional
Published: 2014
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