Search

Your search keyword '"T. Didberidze"' showing total 19 results
Start Over Author "T. Didberidze"
19 results on '"T. Didberidze"'

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

Author

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

Subjects
High Energy Physics - Experiment (hep-ex), Physics - Instrumentation and Detectors, Physics::Instrumentation and Detectors, Astrophysics::Instrumentation and Methods for Astrophysics, FOS: Physical sciences, High Energy Physics::Experiment, Instrumentation and Detectors (physics.ins-det), Nuclear Experiment (nucl-ex), Instrumentation, Nuclear Experiment, Mathematical Physics, High Energy Physics - 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., Manuscript updated in response to JINST reviewer comments

Published
2021

2. GEANT4 models of HPGe detectors for radioassay

Author

R.H.M. Tsang, R. MacLellan, A. Piepke, S. Delaquis, T. Didberidze, D. J. Auty, B. T. Cleveland, Yue Meng, O. Nusair, and T. Tolba

Subjects
Physics, Radiation transport, Nuclear and High Energy Physics, Physics - Instrumentation and Detectors, Detector, Monte Carlo method, FOS: Physical sciences, chemistry.chemical_element, Germanium, Instrumentation and Detectors (physics.ins-det), 010502 geochemistry & geophysics, 01 natural sciences, 030218 nuclear medicine & medical imaging, Semiconductor detector, Nuclear physics, 03 medical and health sciences, 0302 clinical medicine, chemistry, Hpge detector, Instrumentation, 0105 earth and related environmental sciences
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., 24 pages

Published
2019

3. Search for nucleon decays with EXO-200

Author

M. Hughes, E. V. Hansen, A. P. Waite, Simon Johnston, T. Tolba, A.C. Odian, Liang Yang, A. Jamil, C. R. Hall, David Moore, O. Ya. Zeldovich, G. S. Li, T. Didberidze, B. T. Cleveland, L. J. Kaufman, Martin Breidenbach, R. MacLellan, M. Coon, S. J. Daugherty, R. DeVoe, R. H. Nelson, A. Pocar, U. Wichoski, Arun Kumar Soma, C. Chambers, P. C. Rowson, Petr Vogel, P. S. Barbeau, Guofu Cao, M. Danilov, M. J. Jewell, T. Ziegler, W. Cree, Yuehe Lin, David Leonard, V. A. Belov, Thomas Koffas, W. M. Fairbank, S. Delaquis, F. Retiere, K. S. Kumar, J. Zettlemoyer, S. Feyzbakhsh, V.N. Stekhanov, Douglas H Beck, J. C. Davis, Y-R Yen, A. Craycraft, B. Mong, D. Fudenberg, Samuel Homiller, J. Daughhetee, A. Piepke, K. Graham, M. J. Dolinski, C. Licciardi, A. Der Mesrobian-Kabakian, Peter Fierlinger, R. Bayerlein, Gerrit Wrede, A. Johnson, Thilo Michel, A. Karelin, Giorgio Gratta, M. Tarka, J. Farine, A. Dolgolenko, K. Murray, Y. Lan, J. Hoessl, P. Hufschmidt, M. Wagenpfeil, David A. Sinclair, Gisela Anton, A. Robinson, T. Walton, T. Brunner, Alexis G. Schubert, A. Kuchenkov, Justin Albert, R. Tsang, W. R. Cen, R. Gornea, L. J. Wen, Marc Weber, R. Krücken, Jens Dilling, I. Badhrees, T. Daniels, J.-L. Vuilleumier, S. Kravitz, I. Ostrovskiy, O. Njoya, Shu Li, and S. Schmidt

Subjects
Particle physics, Physics - Instrumentation and Detectors, Hadron, FOS: Physical sciences, Elementary particle, nucl-ex, 01 natural sciences, Atomic, High Energy Physics - Experiment, Nuclear physics, Particle decay, High Energy Physics - Experiment (hep-ex), Particle and Plasma Physics, 0103 physical sciences, Isotopes of xenon, Nuclear, Nuclear Experiment (nucl-ex), 010306 general physics, Nuclear Experiment, physics.ins-det, Physics, Quantum Physics, Isotope, 010308 nuclear & particles physics, hep-ex, Molecular, Fermion, Instrumentation and Detectors (physics.ins-det), Nuclear & Particles Physics, ddc, Baryon, Nucleon, Astronomical and Space Sciences
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

4. Searches for double beta decay of Xe134 with EXO-200

Author

L. J. Kaufman, Yuehe Lin, J. J. Russell, K. S. Kumar, T. Michel, Douglas H Beck, T. Daniels, Y-R Yen, J. Walton, M. Danilov, M. J. Jewell, I. Ostrovskiy, C. R. Hall, Y. Lan, David Leonard, A. S. Johnson, P. C. Rowson, J. Daughhetee, R. DeVoe, J. B. Albert, Petr Vogel, O. Ya. Zeldovich, A. Schubert, R. MacLellan, W. Cree, Thomas Koffas, W. M. Fairbank, J. Hoessl, O. Njoya, S. Delaquis, A.C. Odian, F. Retiere, P. Hufschmidt, Shu Li, R. Krücken, M. Hughes, Peter Fierlinger, S. Feyzbakhsh, J. Zettlemoyer, A. P. Waite, David A. Sinclair, A. Der Mesrobian-Kabakian, J. L. Vuilleumier, C. Licciardi, M. Tarka, P. S. Barbeau, A. Craycraft, K. Graham, Jens Dilling, I. Badhrees, C. Chambers, E. Smith, Martin Breidenbach, R. Bayerlein, A. Piepke, A. Karelin, Michael G. Marino, S. J. Daugherty, K. Murray, S. Johnston, David Moore, T. Didberidze, R. H. Nelson, B. T. Cleveland, Gisela Anton, T. Walton, A. Kuchenkov, J. Davis, M. Wagenpfeil, Guofu Cao, U. Wichoski, A. Dolgolenko, B. Mong, Giorgio Gratta, T. Ziegler, T. Tolba, L. J. Wen, Marc Weber, D. Fudenberg, M. J. Dolinski, S. Kravitz, Liang Yang, A. Jamil, R. Tsang, W. R. Cen, R. Gornea, M. Coon, A. Pocar, J. Farine, V. Belov, V.N. Stekhanov, and T. Brunner

Subjects
Physics, Particle physics, Isotope, 010308 nuclear & particles physics, chemistry.chemical_element, 01 natural sciences, Beta decay, Particle detector, 3. Good health, Nuclear physics, Xenon, chemistry, Double beta decay, 0103 physical sciences, Isotopes of xenon, Nuclear astrophysics, 010306 general physics, Radioactive decay
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 kg⋅yr, the lower limits of T^(2νββ_+(1/2) > 8.7×10^(20) yr and T^(0νββ)_(1/2) > 1.1×10^(23) yr at 90% confidence level were derived, with corresponding half-life sensitivities of 1.2×10^(21) yr and 1.9×10^(23) yr. These limits exceed those in the literature for ^(134)Xe, improving by factors of nearly 105 and 2 for the two antineutrino and neutrinoless modes, respectively.

Published
2017

5. Sensitivity and discovery potential of the proposed nEXO experiment to neutrinoless double beta decay

Author

J. L. Vuilleumier, B. Mong, M. Wagenpfeil, J. Dalmasson, A. Piepke, J. Todd, Y. Y. Ding, M. Heffner, Yuehe Lin, John L. Orrell, E. Raguzin, X.L. Sun, J. B. Zhao, C. T. Overman, R. Krücken, D. Qiu, Z. Li, Giorgio Gratta, A. Burenkov, M. Hasan, Arun Kumar Soma, L. J. Kaufman, R. DeVoe, S. J. Daugherty, Samuele Sangiorgio, M. Hughes, K. S. Kumar, V. Veeraraghavan, Y. Lan, Wei Wei, Petr Vogel, Rejean Fontaine, J. Daughhetee, A. Craycraft, U. Wichoski, Ethan Brown, F. Bourque, M. J. Jewell, M. Coon, D. Harris, Yu-Guang Zhou, T. Ziegler, T. Tolba, G. St-Hilaire, T. Tsang, Qun-Yao Wang, T. Stiegler, M. Chiu, J. P. Brodsky, David Moore, F. Retiere, Y. Ito, J. Zettlemoyer, Douglas H Beck, M. Oriunno, Zhijun Ning, S. Johnston, O. Zeldovich, G. Visser, A. Karelin, J. Hößl, A. Pocar, R. Tsang, T. Didberidze, S. Kravitz, Guofu Cao, T. N. Johnson, J. Schneider, P. Hufschmidt, E. V. Hansen, Y-R Yen, David A. Sinclair, F. Vachon, Ryan Killick, David Leonard, K. Murray, Liang Yang, R. J. Newby, Thomas Koffas, A. Jamil, D. Fudenberg, W. M. Fairbank, Gisela Anton, M. Côté, P. C. Rowson, T. Daniels, K. Graham, G. S. Ortega, B. T. Cleveland, M. J. Dolinski, V.N. Stekhanov, K. Odgers, Angelo Dragone, A. House, S. Rescia, A. Kuchenkov, W. Cree, Jean-Francois Pratte, Veljko Radeka, T. Rossignol, S. Feyzbakhsh, R. Saldanha, S. Delaquis, T. Brunner, W. R. Cen, Serge A. Charlebois, C. Licciardi, G. S. Li, R. Gornea, K. Skarpaas, G. Wrede, I. J. Arnquist, M. Tarka, Wei Wu, X. S. Jiang, A. Der Mesrobian-Kabakian, C. Chambers, A.C. Odian, G. Giacomini, A. Schubert, S. Parent, J. Farine, V. Belov, A. Robinson, L. Cao, F. Nolet, L. J. Wen, Marc Weber, S. X. Wu, Lorenzo Fabris, J. B. Albert, R. MacLellan, Thilo Michel, P. S. Barbeau, Jens Dilling, Xuan Zhang, I. Badhrees, I. Ostrovskiy, O. Njoya, A. Iverson, Shu Li, S. Schmidt, T. Rao, N. Roy, and E. W. Hoppe

Subjects
Physics, Time projection chamber, Physics - Instrumentation and Detectors, 010308 nuclear & particles physics, Active medium, Detector, FOS: Physical sciences, Instrumentation and Detectors (physics.ins-det), 01 natural sciences, 7. Clean energy, 3. Good health, Nuclear physics, Homogeneous, 0103 physical sciences, Sensitivity (control systems), Nuclear Experiment (nucl-ex), 010306 general physics, Enriched Xenon Observatory, Nuclear Experiment, Order of magnitude
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

6. Characterization of Silicon Photomultipliers for nEXO

Author

F. Retière, D. Auty, L. Lupin-Jimenez, Lloyd James, J. Dalmasson, L. Huth, N. Ohmart, R. DeVoe, Giorgio Gratta, I. Ostrovskiy, T. Didberidze, and A. Piepke

Subjects
Physics, Nuclear and High Energy Physics, Scintillation, Particle physics, Physics - Instrumentation and Detectors, FOS: Physical sciences, Photodetector, Order (ring theory), chemistry.chemical_element, Instrumentation and Detectors (physics.ins-det), 7. Clean energy, High Energy Physics - Experiment, Characterization (materials science), High Energy Physics - Experiment (hep-ex), Silicon photomultiplier, Xenon, Nuclear Energy and Engineering, chemistry, Light emission, Nuclear Experiment (nucl-ex), Electrical and Electronic Engineering, Nuclear Experiment, Enriched Xenon Observatory
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, 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

7. An RF-only ion-funnel for extraction from high-pressure gases

Author

David Leonard, Thomas Koffas, W. M. Fairbank, T. Daniels, F. Retière, R. MacLellan, D. Fudenberg, J. Farine, P. S. Barbeau, I. Ostrovskiy, F. Leonard, R. Gornea, Marc Weber, D. Tosi, E. Smith, P. C. Rowson, Douglas H Beck, J. Walton, Y-R Yen, K. Graham, U. Wichoski, David A. Sinclair, J. L. Vuilleumier, M. Heffner, A. Craycraft, Monica Dunford, A. Piepke, M. Hughes, A. Sabourov, T. Tolba, A. Schubert, J. B. Albert, W. Feldmeier, L. J. Kaufman, David Moore, T. Didberidze, M. Tarka, B. Mong, D. J. Auty, C. Licciardi, V.N. Stekhanov, T. Brunner, Yuehe Lin, A. Karelin, Martin Breidenbach, S. J. Daugherty, C. Benitez-Medina, Ryan Killick, R. DeVoe, Lorenzo Fabris, C. Chambers, B. T. Cleveland, K. S. Kumar, A. Pocar, C. Ouellet, A. Kuchenkov, Giorgio Gratta, S. Kravitz, V. Varentsov, Liang Yang, Jens Dilling, M. Coon, T. N. Johnson, M. J. Jewell, A. Odian, K. Twelker, X. S. Jiang, R. Krücken, T. Walton, M. P. Rozo, M. J. Dolinski, Michael G. Marino, S. Johnston, P. Fierlinger, Liangjian Wen, and Guofu Cao

Subjects
Physics - Instrumentation and Detectors, Trace Amounts, Physics::Instrumentation and Detectors, FOS: Physical sciences, chemistry.chemical_element, 01 natural sciences, Ion, Xenon, Ionization, 0103 physical sciences, Nuclear Experiment (nucl-ex), Physical and Theoretical Chemistry, 010306 general physics, Nuclear Experiment, Instrumentation, Spectroscopy, Time projection chamber, Chemistry, 010401 analytical chemistry, Extraction (chemistry), Barium, Instrumentation and Detectors (physics.ins-det), Condensed Matter Physics, 0104 chemical sciences, 13. Climate action, Atomic physics, Bar (unit)
Abstract

An RF ion-funnel technique has been developed to extract ions from a high-pressure (10 bar) noble-gas environment into a vacuum (10(-6) mbar). Detailed simulations have been performed and a prototype has been developed for the purpose of extracting Ba-136 ions from Xe gas with high efficiency. With this prototype, ions have been extracted for the first time from high-pressure xenon gas and argon gas. Systematic studies have been carried out and compared to simulations. This demonstration of extraction of ions, with mass comparable to that of the gas generating the high-pressure, has applications to Ba tagging from a Xe-gas time-projection chamber for double-beta decay, as well as to the general problem of recovering trace amounts of an ionized element in a heavy (m > 40 u) carrier gas. (C) 2015 Elsevier B.V. All rights reserved.

Published
2015

8. Search for Neutrinoless Double-Beta Decay with the Upgraded EXO-200 Detector

Author

M. Wagenpfeil, S. Feyzbakhsh, S. Johnston, Martin Breidenbach, M. Coon, P. Fierlinger, Liangjian Wen, S. J. Daugherty, Guofu Cao, K. Graham, C. Licciardi, S. Kravitz, O. Ya. Zeldovich, R. Bayerlein, A. Piepke, R. H. Nelson, A. Schubert, U. Wichoski, Marc Weber, B. T. Cleveland, E. V. Hansen, B. Mong, P. C. Rowson, Giorgio Gratta, A. Kuchenkov, T. Ziegler, P. S. Barbeau, W. Cree, J. Davis, R. Krücken, S. Delaquis, K. Murray, David Leonard, R. Tsang, M. J. Jewell, A. Karelin, V. A. Belov, Gisela Anton, Liang Yang, A. Jamil, J. J. Russell, J. Farine, J. B. Albert, T. Walton, Thomas Koffas, W. M. Fairbank, M. Danilov, W. R. Cen, R. Gornea, J. Hoessl, Y. Lan, P. Hufschmidt, R. DeVoe, L. J. Kaufman, Douglas H Beck, J. Zettlemoyer, David A. Sinclair, Y-R Yen, J. Daughhetee, Yuehe Lin, C. Chambers, J. L. Vuilleumier, C. R. Hall, R. MacLellan, K. S. Kumar, A. Craycraft, T. Tolba, Thilo Michel, T. Brunner, A. S. Johnson, A. Dolgolenko, V.N. Stekhanov, A. Pocar, D. Fudenberg, M. Hughes, A. P. Waite, David Moore, T. Didberidze, Petr Vogel, F. Retiere, G. S. Li, M. J. Dolinski, A. Der Mesrobian-Kabakian, I. Ostrovskiy, O. Njoya, Shu Li, S. Schmidt, Jens Dilling, I. Badhrees, A. Odian, Gerrit Wrede, M. Tarka, and T. Daniels

Subjects
Cryostat, Physics, Particle physics, 010308 nuclear & particles physics, Detector, General Physics and Astronomy, chemistry.chemical_element, FOS: Physical sciences, Radon, 01 natural sciences, Confidence interval, High Energy Physics - Experiment, ddc, Nuclear physics, Lead shielding, High Energy Physics - Experiment (hep-ex), Upgrade, chemistry, Double beta decay, 0103 physical sciences, Nuclear astrophysics, Nuclear Experiment (nucl-ex), 010306 general physics, 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
Full Text
View/download PDF

9. Characterization of an Ionization Readout Tile for nEXO

Author

T. Stiegler, Douglas H Beck, R. Tsang, K. Murray, Gisela Anton, D. Fudenberg, R. Saldanha, Angelo Dragone, J. Todd, Y. Y. Ding, R. Krücken, Jochen M. Schneider, Y-R Yen, Jean-Francois Pratte, P. C. Rowson, K. Skarpaas, S. Kravitz, E. V. Hansen, Liang Yang, S. Feyzbakhsh, A. House, V. Veeraraghavan, R. J. Newby, A. Jamil, Ethan Brown, M. Chiu, W. Cree, A. Burenkov, S. Delaquis, M. Hughes, M. Côté, T. Daniels, Gabriele Giacomini, A. Pocar, Maulik R. Patel, M. Hasan, J. Farine, A. Karelin, R. DeVoe, Jens Dilling, Arun Kumar Soma, Zhijun Ning, T. Tolba, M. J. Jewell, I. Badhrees, David Moore, A. Robinson, T. Didberidze, B. Mong, M. Wagenpfeil, J. Dalmasson, I. J. Arnquist, Xiaoshan Jiang, Yuehe Lin, Veljko Radeka, A. Piepke, Gerrit Wrede, V.N. Stekhanov, J. B. Zhao, S. Parent, U. Wichoski, M. Oriunno, W. R. Cen, C. Chambers, R. Gornea, M. Heffner, A. Odian, D. Qiu, M. Tarka, S. Johnston, T. Ziegler, I. Ostrovskiy, John L. Orrell, E. Raguzin, Z. Li, T. Brunner, S. Rescia, S. X. Wu, Eric W. Hoppe, M. Coon, S. J. Daugherty, A. Schubert, O. Zeldovich, Cory T. Overman, G. Visser, Wei Wu, O. Njoya, A. Iverson, Triveni Rao, Y. Lan, Thomas Tsang, Shu Li, S. Schmidt, J. Daughhetee, Qian Wang, David Leonard, G. S. Ortega, Thomas Koffas, W. M. Fairbank, Samuele Sangiorgio, Giorgio Gratta, J. L. Vuilleumier, B. T. Cleveland, K. Odgers, Serge A. Charlebois, R. MacLellan, Yumei Zhou, Wei Wei, K. S. Kumar, Rejean Fontaine, A. Kuchenkov, P. Hufschmidt, David A. Sinclair, F. Bourque, J. P. Brodsky, G. St-Hilaire, D. Harris, Y. Ito, L. J. Kaufman, M. J. Dolinski, A. Craycraft, Liangjian Wen, Guofu Cao, G. S. Li, Thilo Michel, T. Rossignol, Xiaoyang Sun, C. Licciardi, A. Der Mesrobian-Kabakian, N. Roy, L. Cao, F. Nolet, F. Vachon, Marc Weber, F. Retière, J. B. Albert, X. Zhang, J. Hößl, P. S. Barbeau, V. A. Belov, and Lorenzo Fabris

Subjects
Physics - Instrumentation and Detectors, Materials science, Physics::Instrumentation and Detectors, chemistry.chemical_element, FOS: Physical sciences, STRIPS, 01 natural sciences, law.invention, Optics, Xenon, law, Ionization, 0103 physical sciences, Wafer, 010306 general physics, Instrumentation, Mathematical Physics, Time projection chamber, 010308 nuclear & particles physics, business.industry, Detector, Instrumentation and Detectors (physics.ins-det), Anode, chemistry, visual_art, visual_art.visual_art_medium, Tile, business
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
Full Text
View/download PDF

10. Search for2νββdecay ofXe136to the01+excited state ofBa136with the EXO-200 liquid xenon detector

Author

A.C. Odian, I. Ostrovskiy, David Leonard, Thomas Koffas, W. M. Fairbank, O. Ya. Zeldovich, S. Feyzbakhsh, E. Smith, R. Krücken, D. Beck, M. Coon, D. Fudenberg, T. Brunner, J. King, O. Njoya, R. DeVoe, Peter Fierlinger, Justin Albert, K. Graham, Monica Dunford, A. Pocar, R. H. Nelson, U. Wichoski, M. Weber, T. Walton, Petr Vogel, M. Tarka, C. Licciardi, C. R. Hall, T. Tolba, C. Chambers, Q. Y. Xu, Ryan Killick, R. Tsang, M. Danilov, J. Walton, P. C. Rowson, D. J. Auty, A. Kuchenkov, Jens Dilling, J. Chaves, W. Feldmeier, F. Retiere, B. Mong, C.Y. Prescott, A. Craycraft, Martin Breidenbach, S. J. Daugherty, R. Gornea, L. J. Kaufman, T. Daniels, M. Hughes, J. Farine, S. Delaquis, A. P. Waite, Simon Johnston, J. C. Davis, Y-R Yen, Guofu Cao, T. N. Johnson, Yuehe Lin, Giorgio Gratta, J. L. Wood, David Moore, J. J. Russell, T. Didberidze, A. Der Mesrobian-Kabakian, J.-L. Vuilleumier, K. S. Kumar, B. T. Cleveland, Liang Yang, M. J. Dolinski, S. Kravitz, A. Piepke, A. Burenkov, A. Karelin, A. Johnson, V.N. Stekhanov, David A. Sinclair, T. A. Winick, M. J. Jewell, K. Twelker, L. J. Wen, Alexis G. Schubert, R. MacLellan, M. G. Marino, P. S. Barbeau, V. A. Belov, and A. Dolgolenko

Subjects
Semileptonic decay, Physics, 010308 nuclear & particles physics, Detector, chemistry.chemical_element, 7. Clean energy, 01 natural sciences, Lower limit, Xenon, chemistry, Excited state, 0103 physical sciences, Single phase, Atomic physics, Neutrino, 010306 general physics, Ground state
Abstract

EXO-200 is a single phase liquid xenon detector designed to search for neutrinoless ββ decay of ^(136)Xe to the ground state of ^(136)Ba. We report here on a search for the two-neutrino ββ decay of 136Xe to the first 0+ excited state, 0^+_1, of ^(136)Ba based on a 100 kg 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 × 10^(24) yr. We find no statistically significant evidence for the 2νββ decay to the excited state resulting in a lower limit of T^(2ν)_(1/2)(0^+ → 0^+_1) > 6.9 ×10^(23) yr at 90% CL. This observed limit is consistent with the estimated half-life of 2.5 × 10^(25) yr.

Published
2016

11. An Optimal Energy Estimator to Reduce Correlated Noise for the EXO-200 Light Readout

Author

A. Der Mesrobian-Kabakian, Yuehe Lin, A. Pocar, S. Kravitz, Monica Dunford, C. Y. Prescott, M. Coon, R. Tsang, A. Craycraft, J. L. Wood, V.N. Stekhanov, Liang Yang, K. S. Kumar, W. R. Cen, R. Gornea, K. Graham, J. J. Russell, J. Farine, M. Danilov, Peter Fierlinger, A. Karelin, A. Dolgolenko, R. DeVoe, Douglas H Beck, David Leonard, V. Belov, M. Tarka, Thomas Koffas, W. M. Fairbank, Y-R Yen, Michael G. Marino, T. Daniels, S. Johnston, T. Brunner, C. G. Davis, O. Ya. Zeldovich, T. Walton, Liangjian Wen, A. S. Johnson, Guofu Cao, Martin Breidenbach, S. J. Daugherty, L. J. Kaufman, A. Burenkov, B. Mong, E. Smith, R. Krücken, F. Retière, J. B. Albert, David A. Sinclair, A. Schubert, Ryan Killick, R. H. Nelson, M. J. Dolinski, U. Wichoski, B. T. Cleveland, P. S. Barbeau, T. Tolba, A. Kuchenkov, S. Feyzbakhsh, Marc Weber, C. Licciardi, C. R. Hall, J. L. Vuilleumier, J. Walton, A. Piepke, Giorgio Gratta, W. Feldmeier, J. Davis, M. Hughes, A. P. Waite, M. J. Jewell, K. Twelker, David Moore, T. Didberidze, T. N. Johnson, D. Fudenberg, R. MacLellan, C. Chambers, P. C. Rowson, S. Delaquis, Jens Dilling, A. Odian, I. Ostrovskiy, and O. Njoya

Subjects
Physics - Instrumentation and Detectors, Physics::Instrumentation and Detectors, FOS: Physical sciences, 01 natural sciences, Noise (electronics), Particle detector, High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), Optics, Double beta decay, 0103 physical sciences, Nuclear Experiment (nucl-ex), 010306 general physics, Instrumentation, Nuclear Experiment, Mathematical Physics, Physics, Scintillation, 010308 nuclear & particles physics, business.industry, Detector, Estimator, Instrumentation and Detectors (physics.ins-det), High Energy Physics::Experiment, business, Energy (signal processing), Radioactive decay
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
Full Text
View/download PDF

12. Measurements of the ion fraction and mobility ofα−andβ-decay products in liquid xenon using the EXO-200 detector

Author

A. Craycraft, James G. Davis, I. Ostrovskiy, M. J. Dolinski, A. Karelin, C. G. Davis, Martin Breidenbach, S. J. Daugherty, David A. Sinclair, T. Walton, R. MacLellan, Liang Yang, M. J. Jewell, K. Twelker, B. Mong, A. Schubert, K. Graham, Giorgio Gratta, David Leonard, R. DeVoe, M. Weber, M. G. Marino, V.N. Stekhanov, Douglas H Beck, M. Danilov, P. Fierlinger, Thomas Koffas, W. M. Fairbank, R. Nelson, Y-R Yen, K. O'Sullivan, Guofu Cao, S. Johnston, X. S. Jiang, J. Wood, D. J. Auty, A. Der Mesrobian-Kabakian, Ryan Killick, L. J. Kaufman, R. Tsang, E. Smith, A. Burenkov, M. Coon, B. T. Cleveland, R. Gornea, Yuehe Lin, C. Chambers, A. Kuchenkov, T. Tolba, W. Feldmeier, A. Piepke, P. C. Rowson, L. J. Wen, A. Pocar, J. J. Russell, J.-L. Vuilleumier, K. S. Kumar, S. Delaquis, S. Kravitz, C. Licciardi, O. Ya. Zeldovich, A. Dolgolenko, M. Tarka, J. Farine, V. Belov, A. Robinson, T. Brunner, Justin Albert, Monica Dunford, U. Wichoski, J. D. Wright, T. N. Johnson, A.C. Odian, A. S. Johnson, P. S. Barbeau, C.Y. Prescott, T. Daniels, C. R. Hall, J. Walton, D. Fudenberg, M. Hughes, A. P. Waite, David Moore, and T. Didberidze

Subjects
Physics, Semileptonic decay, Nuclear and High Energy Physics, Particle physics, 010308 nuclear & particles physics, Branching fraction, 01 natural sciences, Charged particle, Ion, Ionization, Double beta decay, 0103 physical sciences, Alpha decay, Atomic physics, 010306 general physics, Crystal Ball
Abstract

Alpha decays in the EXO-200 detector are used to measure the fraction of charged $^{218}\text{Po}$ and $^{214}\text{Bi}$ daughters created from $\ensuremath{\alpha}$ and $\ensuremath{\beta}$ decays, respectively. $^{222}\text{Rn} \ensuremath{\alpha}$ decays in liquid xenon (LXe) are found to produce $^{218}\text{Po}^{+}$ ions $50.3\ifmmode\pm\else\textpm\fi{}3.0%$ of the time, while the remainder of the $^{218}\text{Po}$ atoms are neutral. The fraction of $^{214}\text{Bi}^{+}$ from $^{214}\text{Pb} \ensuremath{\beta}$ decays in LXe is found to be $76.4\ifmmode\pm\else\textpm\fi{}5.7%$, inferred from the relative rates of $^{218}\text{Po}$ and $^{214}\text{Po} \ensuremath{\alpha}$ decays in the LXe. The average velocity of $^{218}\text{Po}$ ions is observed to decrease for longer drift times. Initially the ions have a mobility of $0.390\ifmmode\pm\else\textpm\fi{}0.006\phantom{\rule{4pt}{0ex}}{\text{cm}}^{2}/(\text{kV}\text{s})$, and at long drift times the mobility is $0.219\ifmmode\pm\else\textpm\fi{}0.004\phantom{\rule{4pt}{0ex}}{\text{cm}}^{2}/(\text{kV}\text{s})$. Time constants associated with the change in mobility during drift of the $^{218}\text{Po}^{+}$ ions are found to be proportional to the electron lifetime in the LXe.

Published
2015

13. Investigation of radioactivity-induced backgrounds in EXO-200

Author

T. Daniels, C. Y. Prescott, A. S. Johnson, Douglas H Beck, T. N. Johnson, M. J. Jewell, A. Dolgolenko, D. Fudenberg, Y-R Yen, K. Twelker, J. B. Albert, P. C. Rowson, A. Pocar, M. Hughes, A. Piepke, A. P. Waite, I. Ostrovskiy, J. Farine, R. MacLellan, B. Mong, R. Nelson, U. Wichoski, S. Delaquis, V. Belov, S. Herrin, A Rivas, M. Danilov, A. Craycraft, C. R. Hall, David Moore, A. Schubert, T. Didberidze, A.C. Odian, C. G. Davis, Yuehe Lin, C. Benitez-Medina, Giorgio Gratta, J. Wood, Martin Breidenbach, D. J. Auty, T. Tolba, S. J. Daugherty, J. L. Vuilleumier, P. S. Barbeau, T. Walton, G. Giroux, J. Walton, V.N. Stekhanov, T. Brunner, J. J. Russell, R. Gornea, K. S. Kumar, W. Feldmeier, Marc Weber, David A. Sinclair, Ryan Killick, David Leonard, Thomas Koffas, B. T. Cleveland, W. M. Fairbank, Monica Dunford, A. Kuchenkov, C. Chambers, K. Graham, M. Coon, O. Ya. Zeldovich, A. Karelin, J. Davis, M. Tarka, C. Licciardi, L. J. Kaufman, R. DeVoe, X. S. Jiang, A. Der Mesrobian-Kabakian, E. Smith, S. Kravitz, Liang Yang, M. J. Dolinski, Michael G. Marino, S. Johnston, P. Fierlinger, Liangjian Wen, Guofu Cao, A. Burenkov, and R. Tsang

Subjects
Physics, Nuclear and High Energy Physics, Physics - Instrumentation and Detectors, 010308 nuclear & particles physics, FOS: Physical sciences, Instrumentation and Detectors (physics.ins-det), Parameter space, 01 natural sciences, Beta decay, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), Double beta decay, 0103 physical sciences, Beta (velocity), Nuclear Experiment (nucl-ex), 010306 general physics, 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

14. Spectroscopy of Ba andBa+deposits in solid xenon for barium tagging in nEXO

Author

Michael G. Marino, S. Johnston, T. Tolba, Guofu Cao, I. Ostrovskiy, C. Benitez-Medina, M. J. Dolinski, P. C. Rowson, S. Kravitz, D. Fudenberg, Yuehe Lin, K. Graham, K. Twelker, David Leonard, Jens Dilling, L. J. Wen, Marc Weber, M. Hughes, Thomas Koffas, W. M. Fairbank, T. Brunner, K. Hall, J. L. Vuilleumier, Martin Breidenbach, T. Daniels, David Moore, Liang Yang, T. Didberidze, S. J. Daugherty, D. J. Auty, S. Cook, J. Walton, W. Feldmeier, K. S. Kumar, M. P. Rozo, J. Farine, Lorenzo Fabris, R. Gornea, B. Mong, R. Krücken, U. Wichoski, G. Giroux, David A. Sinclair, R. MacLellan, Ryan Killick, C. Chambers, T. N. Johnson, B. T. Cleveland, Douglas H Beck, A. Kuchenkov, L. J. Kaufman, Y-R Yen, A. Schubert, Giorgio Gratta, A.C. Odian, A. Piepke, E. Smith, Monica Dunford, F. Retière, Peter Fierlinger, A. Pocar, C. Licciardi, V. Basque, P. S. Barbeau, M. Tarka, M. Heffner, M. Coon, V.N. Stekhanov, X. S. Jiang, R. DeVoe, Y. B. Zhao, T. Walton, A. Craycraft, A. Karelin, and J. B. Albert

Subjects
Physics, Physics - Instrumentation and Detectors, Atomic Physics (physics.atom-ph), Analytical chemistry, FOS: Physical sciences, chemistry.chemical_element, Barium, Instrumentation and Detectors (physics.ins-det), Type (model theory), Atomic and Molecular Physics, and Optics, Physics - Atomic Physics, High Energy Physics - Experiment, Ion, High Energy Physics - Experiment (hep-ex), Xenon, chemistry, Atom, Physics::Atomic Physics, Emission spectrum, Nuclear Experiment (nucl-ex), Absorption (chemistry), Atomic physics, Spectroscopy, Nuclear Experiment
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 ${\mathrm{Ba}}^{+}$ 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 fewer than or equal to ${10}^{4}$ Ba atoms can be obtained. Prospects for imaging single Ba atoms in solid xenon are discussed.

Published
2015

15. Search for Majoron-emitting modes of double-beta decay ofXe136with EXO-200

Author

J. L. Vuilleumier, David A. Sinclair, W. Feldmeier, R. Gornea, M. Danilov, L. J. Kaufman, I. Ostrovskiy, J. Farine, D. J. Auty, Peter Fierlinger, X. S. Jiang, D. Tosi, V. Belov, V.N. Stekhanov, T. N. Johnson, C. G. Davis, Martin Breidenbach, R. Nelson, M. Tarka, Michael G. Marino, Douglas H Beck, S. Johnston, S. J. Daugherty, A.C. Odian, Y-R Yen, B. Mong, J. Davis, Liangjian Wen, Guofu Cao, Giorgio Gratta, T. Daniels, C. Benitez-Medina, M. Coon, C. Chambers, Ryan Killick, Monica Dunford, A. Dolgolenko, David Leonard, B. T. Cleveland, M. J. Jewell, Thomas Koffas, W. M. Fairbank, P. C. Rowson, A. Kuchenkov, K. Twelker, E. Beauchamp, G. Giroux, Yuehe Lin, R. DeVoe, R. Tsang, T. Walton, Petr Vogel, J. J. Russell, J. Chaves, S. Delaquis, A Rivas, K. S. Kumar, Marc Weber, A. Karelin, A. Schubert, U. Wichoski, C. Y. Prescott, S. Herrin, C. R. Hall, R. MacLellan, A. S. Johnson, J. B. Albert, F. Leonard, A. Burenkov, T. Brunner, E. Smith, O. Ya. Zeldovich, S. Kravitz, M. P. Rozo, A. Piepke, K. Graham, Liang Yang, A. Pocar, C. Ouellet, M. J. Dolinski, A. Craycraft, C. Licciardi, P. S. Barbeau, J. Walton, D. Fudenberg, M. Hughes, A. P. Waite, David Moore, T. Didberidze, and T. Tolba

Subjects
Coupling constant, Physics, Nuclear and High Energy Physics, Spectral index, 010308 nuclear & particles physics, chemistry.chemical_element, 01 natural sciences, Beta decay, Lower limit, Xenon, chemistry, Double beta decay, 0103 physical sciences, Single phase, Atomic physics, 010306 general physics, Majoron
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 yr exposure of ^(136)Xe. A lower limit of T^(136)Xe_(1/2) > 1.2 × 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) × 10^(−5).

Published
2014

16. Cosmogenic backgrounds to 0νββ in EXO-200

Author

A. Der Mesrobian-Kabakian, Ryan Killick, B. T. Cleveland, J. Walton, A. Kuchenkov, Douglas H Beck, Y-R Yen, T. Daniels, David A. Sinclair, Peter Fierlinger, E. Smith, M. Tarka, Yuehe Lin, T. Tolba, T. Walton, R. Tsang, J. Davis, A. Craycraft, C. Chambers, M. Danilov, Jens Dilling, D. Fudenberg, M. J. Jewell, J. L. Wood, R. Gornea, K. Twelker, Michael G. Marino, D. J. Auty, A. Pocar, S. Johnston, A. Dolgolenko, David Leonard, A. Odian, K. S. Kumar, R. Krücken, Guofu Cao, R. DeVoe, R. MacLellan, M. Hughes, Thomas Koffas, W. M. Fairbank, I. Ostrovskiy, A. P. Waite, S. Herrin, Monica Dunford, J. L. Vuilleumier, O. Njoya, P. C. Rowson, O. Ya. Zeldovich, T. Brunner, Giorgio Gratta, K. Graham, L. J. Wen, Marc Weber, Martin Breidenbach, David Moore, B. Mong, W. Feldmeier, T. Didberidze, V.N. Stekhanov, R. H. Nelson, U. Wichoski, S. J. Daugherty, S. Delaquis, A. S. Johnson, S. Feyzbakhsh, M. J. Dolinski, L. J. Kaufman, C. Licciardi, J. J. Russell, C. Y. Prescott, M. Coon, C. R. Hall, J. B. Albert, A. Burenkov, T. N. Johnson, A. Schubert, J. Farine, V. Belov, S. Kravitz, Liang Yang, A. Piepke, A. Karelin, F. Retière, and P. S. Barbeau

Subjects
Physics, Radionuclide, Time projection chamber, 010308 nuclear & particles physics, Cosmic background radiation, chemistry.chemical_element, Astronomy and Astrophysics, 7. Clean energy, 01 natural sciences, Particle identification, Nuclear physics, Neutron capture, Xenon, chemistry, 13. Climate action, Double beta decay, 0103 physical sciences, Neutron, 010306 general physics
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 Φ = 4.07 ± 0.14 (sys) ± 0.03 (stat) × 10−7cm−2 s−1, with a vertical intensity of Iv = 2.97 −0.13 (sys) ± 0.02 (stat) × 10−7cm−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 0νββ search with EXO-200. Muon-induced neutron backgrounds were measured using γ-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, γ) events will allow for rejection of 137Xe backgrounds in future 0νββ analyses.

Published
2016

17. An apparatus to manipulate and identify individual Ba ions from bulk liquid Xe

Author

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

Subjects
Physics - Instrumentation and Detectors, Materials science, Analytical chemistry, FOS: Physical sciences, chemistry.chemical_element, Barium, Instrumentation and Detectors (physics.ins-det), Mass spectrometry, Ion, Xenon, chemistry, Double beta decay, Decay product, Spectroscopy, Instrumentation, Radioactive decay
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., 12 pages, 13 figures

Published
2014

18. Search for Neutrinoless Double-Beta Decay with the Upgraded EXO-200 Detector.

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, 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, Rowson PC, Russell JJ, Schmidt S, Schubert A, Sinclair D, Stekhanov V, Tarka M, Tolba T, Tsang R, Vogel P, Vuilleumier JL, Wagenpfeil M, Waite A, Walton T, Weber M, Wen LJ, Wichoski U, Wrede G, Yang L, Yen YR, Zeldovich OY, Zettlemoyer J, and Ziegler T

Abstract

Results from a search for neutrinoless double-beta decay (0νββ) 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 σ/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 0νββ and background events have been developed. Incorporating these hardware and analysis improvements, the median 90% confidence level 0νββ half-life sensitivity after combining with the full data set acquired before the upgrade has increased twofold to 3.7×10^{25}  yr. No statistically significant evidence for 0νββ is observed, leading to a lower limit on the 0νββ half-life of 1.8×10^{25}  yr at the 90% confidence level.

Published
2018
Full Text
View/download PDF

19. An apparatus to manipulate and identify individual Ba ions from bulk liquid Xe.

Author

Twelker K, Kravitz S, Montero Díez M, Gratta G, Fairbank W Jr, Albert JB, Auty DJ, Barbeau PS, Beck D, Benitez-Medina C, Breidenbach M, Brunner T, Cao GF, Chambers C, Cleveland B, Coon M, Craycraft A, Daniels T, Daugherty SJ, Davis CG, DeVoe R, Delaquis S, Didberidze T, Dilling J, Dolinski MJ, 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 XS, Johnson TN, Johnston S, Karelin A, Kaufman LJ, Killick R, Koffas T, Krücken R, Kuchenkov A, Kumar KS, Leonard DS, Leonard F, Licciardi C, Lin YH, MacLellan R, Marino MG, Mong B, Moore D, Odian A, Ostrovskiy I, Ouellet C, Piepke A, Pocar A, Retiere F, Rowson PC, Rozo MP, Schubert A, Sinclair D, Smith E, Stekhanov V, Tarka M, Tolba T, Tosi D, Vuilleumier JL, Walton J, Walton T, Weber M, Wen LJ, Wichoski U, Yang L, Yen YR, and Zhao YB

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 mass spectroscopy for positive identification of the barium decay product.

Published
2014
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results