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1. The MAJORANA DEMONSTRATOR Neutrinoless Double-Beta Decay Experiment

Author: N. Abgrall, E. Aguayo, F. T. Avignone, A. S. Barabash, F. E. Bertrand, M. Boswell, V. Brudanin, M. Busch, A. S. Caldwell, Y.-D. Chan, C. D. Christofferson, D. C. Combs, J. A. Detwiler, P. J. Doe, Yu. Efremenko, V. Egorov, H. Ejiri, S. R. Elliott, J. Esterline, J. E. Fast, P. Finnerty, F. M. Fraenkle, A. Galindo-Uribarri, G. K. Giovanetti, J. Goett, M. P. Green, J. Gruszko, V. E. Guiseppe, K. Gusev, A. L. Hallin, R. Hazama, A. Hegai, R. Henning, E. W. Hoppe, S. Howard, M. A. Howe, K. J. Keeter, M. F. Kidd, A. Knecht, O. Kochetov, S. I. Konovalov, R. T. Kouzes, B. D. LaFerriere, J. Leon, L. E. Leviner, J. C. Loach, P. N. Luke, S. MacMullin, R. D. Martin, S. Mertens, L. Mizouni, M. Nomachi, J. L. Orrell, C. O'Shaughnessy, N. R. Overman, David Phillips, A. W. P. Poon, K. Pushkin, D. C. Radford, K. Rielage, R. G. H. Robertson, M. C. Ronquest, A. G. Schubert, B. Shanks, T. Shima, M. Shirchenko, K. J. Snavely, N. Snyder, D. Steele, J. Strain, A. M. Suriano, J. Thompson, V. Timkin, W. Tornow, R. L. Varner, S. Vasilyev, K. Vetter, K. Vorren, B. R. White, J. F. Wilkerson, T. Williams, W. Xu, E. Yakushev, A. R. Young, C.-H. Yu, and V. Yumatov
Subjects: Physics, QC1-999
Abstract: The Majorana Demonstrator will search for the neutrinoless double-beta (ββ0ν) decay of the isotope Ge with a mixed array of enriched and natural germanium detectors. The observation of this rare decay would indicate that the neutrino is its own antiparticle, demonstrate that lepton number is not conserved, and provide information on the absolute mass scale of the neutrino. The Demonstrator is being assembled at the 4850-foot level of the Sanford Underground Research Facility in Lead, South Dakota. The array will be situated in a low-background environment and surrounded by passive and active shielding. Here we describe the science goals of the Demonstrator and the details of its design.
Published: 2014
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2. Spectral analysis for the Majorana Demonstrator experiment

Author: B. X. Zhu, V. Yumatov, J. Gruszko, Yu. Efremenko, M. Buuck, G. K. Giovanetti, Keith Rielage, B. Shanks, V. E. Guiseppe, T. Gilliss, R. D. Martin, R. G. H. Robertson, A. W. Bradley, T. Bode, C-H. Yu, Eric W. Hoppe, J. A. Detwiler, M. Shirchenko, M. P. Green, C. J. Barton, C. Dunagan, T. S. Caldwell, Ralph Massarczyk, Walter C. Pettus, C. R. Haufe, C.M. O'Shaughnessy, S. I. Alvis, A. L. Reine, S. Vasilyev, N. Abgrall, I. Zhitnikov, R. L. Varner, F. E. Bertrand, I. J. Arnquist, N. W. Ruof, Anne-Marie Suriano, I. S. Guinn, C. Cuesta, W. Xu, J. E. Trimble, Pinghan Chu, G. Othman, A. W. P. Poon, Y-D. Chan, K. J. Keeter, D. Tedeschi, L. Hehn, S. I. Konovalov, J. Myslik, M. A. Howe, Richard T. Kouzes, J. Rager, H. Ejiri, Steven Elliott, Kai Vetter, C. D. Christofferson, M. F. Kidd, Susanne Mertens, E. Yakushev, J. F. Wilkerson, S. J. Meijer, B. R. White, K. Vorren, V.B. Brudanin, F. T. Avignone, Reyco Henning, A. M. Lopez, C. Wiseman, A. S. Barabash, D. C. Radford, and M. Busch
Subjects: Physics, History, Physics - Instrumentation and Detectors, FOS: Physical sciences, Molecular, Instrumentation and Detectors (physics.ins-det), nucl-ex, Condensed Matter Physics, Atomic, Computer Science Applications, Education, Combinatorics, Other Physical Sciences, Monte carlo data, MAJORANA, Particle and Plasma Physics, Background suppression, Statistical analysis, Spectral analysis, Nuclear, Nuclear Experiment (nucl-ex), Nuclear Experiment, physics.ins-det
Abstract: The MAJORANA DEMONSTRATOR is an experiment constructed to search for neutrinoless double-beta decays in germanium-76 and to demonstrate the feasibility to deploy a ton-scale experiment in a phased and modular fashion. It consists of two modular arrays of natural and $^{76}\textrm{Ge}$-enriched germanium detectors totaling 44.1 kg (29.7 kg enriched detectors), located at the 4850' level of the Sanford Underground Research Facility in Lead, South Dakota, USA. Data taken with this setup since summer 2015 at different construction stages of the experiment show a clear reduction of the observed background index around the ROI for $0\nu\beta\beta$-decay search due to improvements in shielding. We discuss the statistical approaches to search for a $0\nu\beta\beta$-signal and derive the physics sensitivity for an expected exposure of $10\,\textrm{kg}{\cdot}\textrm{y}$ from enriched detectors using a profile likelihood based hypothesis test in combination with toy Monte Carlo data., Comment: 5 page, 2 figures, to appear in Proceedings of TAUP 2017 - XV International Conference on Topics in Astroparticle and Underground Physics, 24 - 28 July 2017, Sudbury, ON, Canada
Published: 2020

3. Data quality assurance for the Majorana Demonstrator

Author: C.M. O'Shaughnessy, Kai Vetter, C. D. Christofferson, M. F. Kidd, Keith Rielage, V. Yumatov, Yu. Efremenko, M. Shirchenko, C. Cuesta, K. Vorren, I. J. Arnquist, N. W. Ruof, F. E. Bertrand, Ralph Massarczyk, G. K. Giovanetti, F. T. Avignone, A. S. Barabash, Reyco Henning, A. W. P. Poon, A. M. Lopez, J. Gruszko, S. Vasilyev, N. Abgrall, C. R. Haufe, J. E. Trimble, S. I. Alvis, B. Shanks, V. E. Guiseppe, Pinghan Chu, J. Myslik, R. L. Varner, M. P. Green, I. Zhitnikov, T. Gilliss, V.B. Brudanin, K. J. Keeter, D. Tedeschi, T. Bode, C-H. Yu, Richard T. Kouzes, L. Hehn, R. D. Martin, Susanne Mertens, E. Yakushev, D. C. Radford, R. G. H. Robertson, Eric W. Hoppe, Walter C. Pettus, A. W. Bradley, S. J. Meijer, C. Wiseman, A. L. Reine, B. X. Zhu, S. I. Konovalov, M. Busch, T. S. Caldwell, Anne-Marie Suriano, M. Buuck, J. A. Detwiler, G. Othman, C. Dunagan, I. S. Guinn, C. J. Barton, W. Xu, Y-D. Chan, J. F. Wilkerson, B. R. White, M. A. Howe, J. Rager, H. Ejiri, and Steven Elliott
Subjects: Physics, Discrete mathematics, History, Physics - Instrumentation and Detectors, Molecular, FOS: Physical sciences, Instrumentation and Detectors (physics.ins-det), Condensed Matter Physics, Atomic, Computer Science Applications, Education, Other Physical Sciences, MAJORANA, Particle and Plasma Physics, Nuclear, physics.ins-det
Abstract: The MAJORANA DEMONSTRATOR is an experiment constructed to search for neutrinoless double-beta decays in germanium-76 and to demonstrate the feasibility to deploy a large-scale experiment in a phased and modular fashion. It consists of two modular arrays of natural and $^{76}$Ge-enriched germanium detectors totalling 44.1 kg, located at the 4850' level of the Sanford Underground Research Facility in Lead, South Dakota, USA. Any neutrinoless double-beta decay search requires a thorough understanding of the background and the signal energy spectra. The various techniques employed to ensure the integrity of the measured spectra are discussed. Data collection is monitored with a thorough set of checks, and subsequent careful analysis is performed to qualify the data for higher level physics analysis. Instrumental background events are tagged for removal, and problematic channels are removed from consideration as necessary., Comment: 5 pages, 2 figures, Proceedings of TAUP 2017 - XV International Conference on Topics in Astroparticle and Underground Physics (Sudbury ON, Canada, July 24-28, 2017)
Published: 2020
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4. Initial results from the Majorana Demonstrator

Author: V. B. Brudanin, Walter C. Pettus, F. E. Bertrand, C. Dunagan, Eric W. Hoppe, Keith Rielage, J. Myslik, D. J. Tedeschi, A. S. Barabash, T. S. Caldwell, M. P. Green, Kai Vetter, C. Wiseman, M. Shirchenko, H. Ejiri, C. R. Haufe, K. J. Keeter, J. E. Trimble, S. I. Alvis, C. D. Christofferson, Pinghan Chu, Ralph Massarczyk, S. I. Konovalov, I. Zhitnikov, Matthew Busch, B. Shanks, M. F. Kidd, T. Bode, V. E. Guiseppe, M. Buuck, F. T. Avignone, R. L. Varner, B. Bos, B. X. Zhu, G. Othman, I. J. Arnquist, N. W. Ruof, Reyco Henning, A. M. Lopez, Anne-Marie Suriano, T. Gilliss, J. A. Detwiler, J. F. Wilkerson, Yu. Efremenko, C. O'Shaughnessy, R. D. Martin, A. W. P. Poon, Vladimir Yumatov, Richard T. Kouzes, B. R. White, S. Vasilyev, R. G. H. Robertson, S. R. Elliott, L. Hehn, C. Cuesta, J. Rager, G. K. Giovanetti, N. Abgrall, D. C. Radford, A. L. Reine, K. Vorren, S. J. Meijer, J. Gruszko, A. W. Bradley, Susanne Mertens, E. Yakushev, W. Xu, M. A. Howe, Y-D. Chan, C.-H. Yu, I. S. Guinn, and C. J. Barton
Subjects: History, Particle physics, Physics - Instrumentation and Detectors, FOS: Physical sciences, nucl-ex, 7. Clean energy, 01 natural sciences, Atomic, Education, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), Point contact, Particle and Plasma Physics, 0103 physical sciences, Nuclear, Detector array, Nuclear Experiment (nucl-ex), 010306 general physics, Nuclear Experiment, physics.ins-det, Physics, 010308 nuclear & particles physics, hep-ex, Detector, Molecular, Instrumentation and Detectors (physics.ins-det), Condensed Matter Physics, Computer Science Applications, Semiconductor detector, Other Physical Sciences, MAJORANA, Single lead
Abstract: Neutrinoless double-beta decay searches seek to determine the nature of neutrinos, the existence of a lepton violating process, and the effective Majorana neutrino mass. The {\sc Majorana} Collaboration is assembling an array of high purity Ge detectors to search for neutrinoless double-beta decay in $^{76}$Ge. The {\sc Majorana Demonstrator} is composed of 44.8~kg (29.7 kg enriched in $^{76}$Ge) of Ge detectors in total, split between two modules contained in a low background shield at the Sanford Underground Research Facility in Lead, South Dakota. The initial goals of the {\sc Demonstrator} are to establish the required background and scalability of a Ge-based, next-generation, tonne-scale experiment. Following a commissioning run that began in 2015, the first detector module started physics data production in early 2016. We will discuss initial results of the Module 1 commissioning and first physics run, as well as the status and potential physics reach of the full {\sc Majorana Demonstrator} experiment. The collaboration plans to complete the assembly of the second detector module by mid-2016 to begin full data production with the entire array., Neutrino 2016 proceeding
Published: 2020
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5. Status of the MAJORANA DEMONSTRATOR

Author: D. Byram, Jonathan D. Leon, M. Shirchenko, T. Gilliss, John L. Orrell, Vladimir Yumatov, R. D. Martin, Alan Poon, M. P. Green, Anne-Marie Suriano, J. A. Detwiler, W. Xu, Stanley M. Howard, H. Ejiri, J. F. Wilkerson, C.-H. Yu, C.M. O'Shaughnessy, B. R. White, R. G. H. Robertson, Yu. Efremenko, M. Buuck, Keith Rielage, E. Romero-Romero, S. I. Konovalov, J. E. Trimble, J. Rager, A. Galindo-Uribarri, I. Zhitnikov, Matthew Busch, C. Cuesta, F. T. Avignone, Kai Vetter, S. Vasilyev, Yuen-Dat Chan, Brian D. LaFerriere, C. D. Christofferson, R. L. Varner, J. MacMullin, Reyco Henning, N. Abgrall, D. J. Tedeschi, I. S. Guinn, B. Shanks, B. R. Jasinski, Eric W. Hoppe, J. Gruszko, A. S. Caldwell, V. E. Guiseppe, K. Vorren, C. Wiseman, M. A. Howe, F. E. Bertrand, J. Goett, A. W. Bradley, S. R. Elliott, D. C. Radford, K. Keeter, E. Yakushev, A. S. Barabash, V.B. Brudanin, Richard T. Kouzes, C. X. Balderrot-Barrera, G. K. Giovanetti, S. J. Meijer, Susanne Mertens, M. F. Kidd, I. J. Arnquist, and N. Snyder
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, 010308 nuclear & particles physics, business.industry, Modular design, 01 natural sciences, Semiconductor detector, Nuclear physics, MAJORANA, 0103 physical sciences, Detector array, 010306 general physics, business
Abstract: The MAJORANA Collaboration is constructing the MAJORANA DEMONSTRATOR, an ultralow background, 40-kg modular high purity Ge (HPGe) detector array to search for neutrinoless double-beta decay (0νββ-decay) in 76Ge. The goal of the experiment is to demonstrate a background rate at or below 3 counts/(t-y) in the 4 keV region of interest (ROI) around the 2039 keV Q-value for 76Ge 0νββ-decay. In this paper, the status of the MAJORANA DEMONSTRATOR, including its design and measurements of properties of the HPGe crystals is presented.
Published: 2017
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6. High voltage testing for the Majorana Demonstrator

Author: Ralph Massarczyk, A. Galindo-Uribarri, Yuen-Dat Chan, S. Vasilyev, A. Li, A. Thompson, Alan Poon, N. Abgrall, Anne-Marie Suriano, J. A. Detwiler, Z. Fu, F. E. Bertrand, R. D. Martin, J. Gruszko, J. Goett, J. F. Wilkerson, R. G. H. Robertson, M. A. Howe, E. Romero-Romero, D. J. Tedeschi, B. R. White, C.M. O'Shaughnessy, Stanley M. Howard, Jonathan D. Leon, I. S. Guinn, F. T. Avignone, R. L. Varner, B. R. Jasinski, M. P. Green, M. Buuck, C. Wiseman, Reyco Henning, Eric W. Hoppe, C. Cuesta, J. Rager, D. Byram, Matthew Busch, Y.-U. Efremenko, P. J. Doe, C.-H. Yu, H. Ejiri, A. S. Barabash, Susanne Mertens, A. W. Bradley, V. Yumatov, K. J. Keeter, V.B. Brudanin, B. Shanks, V. E. Guiseppe, S. R. Elliott, Brian D. LaFerriere, D. C. Radford, A. S. Caldwell, Keith Rielage, M. Shirchenko, John L. Orrell, J. MacMullin, Kai Vetter, S. J. Meijer, C. D. Christofferson, K. Vorren, K. T. Ton, M. F. Kidd, E. Yakushev, C. Dunagan, S. I. Konovalov, W. Xu, G. K. Giovanetti, J. E. Trimble, Pinghan Chu, Richard T. Kouzes, I. J. Arnquist, and N. Snyder
Subjects: Nuclear and High Energy Physics, Physics - Instrumentation and Detectors, Vacuum, FOS: Physical sciences, Feedthrough, Context (language use), nucl-ex, Atomic, 01 natural sciences, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), Particle and Plasma Physics, 0103 physical sciences, Nuclear, Nuclear Experiment (nucl-ex), 010306 general physics, physics.ins-det, Nuclear Experiment, Instrumentation, Physics, MAJORANA, hep-ex, 010308 nuclear & particles physics, business.industry, Detector, Electrical engineering, Molecular, High voltage, Instrumentation and Detectors (physics.ins-det), High-voltage, Micro-discharge, Modular design, Nuclear & Particles Physics, Semiconductor detector, Other Physical Sciences, business, Astronomical and Space Sciences, Voltage
Abstract: The MAJORANA Collaboration is constructing the MAJORANA Demonstrator, an ultra-low background, 44-kg modular high-purity Ge (HPGe) detector array to search for neutrinoless double-beta decay in Ge-76. The phenomenon of surface micro-discharge induced by high-voltage has been studied in the context of the MAJORANA Demonstrator. This effect can damage the front-end electronics or mimic detector signals. To ensure the correct performance, every high-voltage cable and feedthrough must be capable of supplying HPGe detector operating voltages as high as 5 kV without exhibiting discharge. R&D measurements were carried out to understand the testing system and determine the optimum design configuration of the high-voltage path, including different improvements of the cable layout and feedthrough flange model selection. Every cable and feedthrough to be used at the MAJORANA Demonstrator was characterized and the micro-discharge effects during the MAJORANA Demonstrator commissioning phase were studied. A stable configuration has been achieved, and the cables and connectors can supply HPGe detector operating voltages without exhibiting discharge., 9 pages, 12 figures, 8 tables, submitted to NIM A
Published: 2016
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7. Progress Toward A 2νββ Measurement For The Majorana Demonstrator

Author: Yuen-Dat Chan, G. K. Giovanetti, J. F. Wilkerson, K. Vorren, I. J. Arnquist, N. W. Ruof, C. Wiseman, A. W. P. Poon, C. R. Haufe, B. Shanks, M. A. Howe, J. Gruszko, S. I. Alvis, F. T. Avignone, I. S. Guinn, R. L. Varner, J. E. Trimble, V. E. Guiseppe, A. S. Barabash, Reyco Henning, Ralph Massarczyk, Pinghan Chu, A. M. Lopez, T. Gilliss, I. Zhitnikov, Matthew Busch, V. B. Brudanin, C. Dunagan, C.-H. Yu, S. Vasilyev, N. Abgrall, J. Rager, R. D. Martin, Keith Rielage, K. J. Keeter, R. G. H. Robertson, C. D. Christofferson, F. E. Bertrand, M. P. Green, A. W. Bradley, H. Ejiri, D. J. Tedeschi, M. F. Kidd, B. X. Zhu, E. Yakushev, Susanne Mertens, Eric W. Hoppe, T. S. Caldwell, J. Myslik, S. J. Meijer, S. I. Konovalov, V. Yumatov, G. Othman, S. R. Elliott, Yu. Efremenko, B. R. White, Anne-Marie Suriano, J. A. Detwiler, L. Hehn, C. Cuesta, C.M. O'Shaughnessy, M. Shirchenko, Richard T. Kouzes, T. Bode, D. C. Radford, Kai Vetter, Walter C. Pettus, A. L. Reine, W. Xu, C. J. Barton, and M. Buuck
Subjects: Physics, Nuclear physics, History, MAJORANA, Point contact, Muon, Energy spectrum, Computer Science Applications, Education
Abstract: Author(s): Gilliss, T; Abgrall, N; Alvis, SI; Arnquist, IJ; Avignone, FT; Barabash, AS; Barton, CJ; Bertrand, FE; Bode, T; Bradley, AW; Brudanin, V; Busch, M; Buuck, M; Caldwell, TS; Chan, YD; Christofferson, CD; Chu, PH; Cuesta, C; Detwiler, JA; Dunagan, C; Efremenko, Y; Ejiri, H; Elliott, SR; Giovanetti, GK; Green, MP; Gruszko, J; Guinn, IS; Guiseppe, VE; Haufe, CR; Hehn, L; Henning, R; Hoppe, EW; Howe, MA; Keeter, KJ; Kidd, MF; Konovalov, SI; Kouzes, RT; Lopez, AM; Martin, RD; Massarczyk, R; Meijer, SJ; Mertens, S; Myslik, J; O'Shaughnessy, C; Othman, G; Pettus, W; Poon, AWP; Radford, DC; Rager, J; Reine, AL; Rielage, K; Robertson, RGH; Ruof, NW; Shanks, B; Shirchenko, M; Suriano, AM; Tedeschi, D; Trimble, JE; Varner, RL; Vasilyev, S; Vetter, K; Vorren, K; White, BR; Wilkerson, JF; Wiseman, C; Xu, W; Yakushev, E; Yu, CH; Yumatov, V; Zhitnikov, I; Zhu, BX | Abstract: The MAJORANA DEMONSTRATOR is a 76Ge-based neutrinoless double-beta decay (0νββ) experiment. Staged at the 4850 ft level of the Sanford Underground Research Facility, the DEMONSTRATOR operates an array of high-purity p-Type point contact Ge detectors deployed within a graded passive shield and an active muon veto system. The present work concerns the two-neutrino double-beta decay mode (2νββ) of 76Ge. For Ge detectors, having superior energy resolution (0.1%), this mode poses negligible background to the 0νββ mode, even for a ton-scale experiment. However, the measurement of the 2νββ mode allows for careful systematics checks of active detector mass, enrichment fraction, and pulse shape discrimination cuts related to both the 0νββ and 2νββ decay modes. A precision measurement of the 2νββ shape also allows searches for spectral distortions, possibly indicative of new physics, including 0νββχ. Work is underway to construct a full experimental background model enabling a Bayesian fit to the measured energy spectrum and extraction of a precise 2νββ spectrum and half-life.
Published: 2020
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8. Initial results from the Majorana Demonstrator

Author: Ralph Massarczyk, J. Gruszko, M. Shirchenko, V. B. Brudanin, W. Xu, J. F. Wilkerson, S. Vasilyev, J. Rager, Keith Rielage, N. Abgrall, C. R. Haufe, T. Bode, C. J. Barton, S. I. Alvis, M. Buuck, C. Wiseman, G. K. Giovanetti, F. E. Bertrand, B. Bos, Walter C. Pettus, G. Othman, C. Dunagan, I. Zhitnikov, Matthew Busch, J. E. Trimble, A. W. Bradley, Eric W. Hoppe, Pinghan Chu, D. J. Tedeschi, I. J. Arnquist, N. W. Ruof, Yu. Efremenko, T. S. Caldwell, E. Yakushev, A. S. Barabash, C.-H. Yu, M. F. Kidd, I. S. Guinn, L. Hehn, B. Shanks, C. D. Christofferson, V. E. Guiseppe, B. X. Zhu, A. W. P. Poon, C. Cuesta, D. C. Radford, T. Gilliss, R. D. Martin, R. G. H. Robertson, A. L. Reine, K. Vorren, Kai Vetter, M. A. Howe, Richard T. Kouzes, B. R. White, S. J. Meijer, M. P. Green, H. Ejiri, Susanne Mertens, K. J. Keeter, C. O׳Shaughnessy, F. T. Avignone, R. L. Varner, Reyco Henning, A. M. Lopez, Chan Y-D., J. Myslik, S. I. Konovalov, V. Yumatov, S. R. Elliott, Anne-Marie Suriano, and J. A. Detwiler
Subjects: Physics, History, MAJORANA, Particle physics, Full data, Neutrino, Computer Science Applications, Education
Abstract: Author(s): Elliott, SR; Abgrall, N; Arnquist, IJ; Avignone, FT; Barabash, AS; Bertrand, FE; Bradley, AW; Brudanin, V; Busch, M; Buuck, M; Caldwell, TS; Chan, YD; Christofferson, CD; Chu, PH; Cuesta, C; Detwiler, JA; Dunagan, C; Efremenko, Y; Ejiri, H; Fullmer, A; Galindo-Uribarri, A; Gilliss, T; Giovanetti, GK; Green, MP; Gruszko, J; Guinn, IS; Guiseppe, VE; Henning, R; Hoppe, EW; Howe, MA; Jasinski, BR; Keeter, KJ; Kidd, MF; Konovalov, SI; Kouzes, RT; Leon, J; Lopez, AM; Macmullin, J; Martin, RD; Massarczyk, R; Meijer, SJ; Mertens, S; Orrell, JL; O'Shaughnessy, C; Poon, AWP; Radford, DC; Rager, J; Rielage, K; Robertson, RGH; Romero-Romero, E; Shanks, B; Shirchenko, M; Suriano, AM; Tedeschi, D; Trimble, JE; Varner, RL; Vasilyev, S; Vetter, K; Vorren, K; White, BR; Wilkerson, JF; Wiseman, C; Xu, W; Yakushev, E; Yu, CH; Yumatov, V; Zhitnikov, I | Abstract: Neutrinoless double-beta decay searches seek to determine the nature of neutrinos, the existence of a lepton violating process, and the effective Majorana neutrino mass. The Majorana Collaboration is assembling an array of high purity Ge detectors to search for neutrinoless double-beta decay in 76Ge. The Majorana Demonstrator is composed of 44.8 kg (29.7 kg enriched in 76Ge) of Ge detectors in total, split between two modules contained in a low background shield at the Sanford Underground Research Facility in Lead, South Dakota. The initial goals of the Demonstrator are to establish the required background and scalability of a Ge-based, next-generation, tonne-scale experiment. Following a commissioning run that began in 2015, the first detector module started physics data production in early 2016. We will discuss initial results of the Module 1 commissioning and first physics run, as well as the status and potential physics reach of the full Majorana Demonstrator experiment. The collaboration plans to complete the assembly of the second detector module by mid-2016 to begin full data production with the entire array.
Published: 2020
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9. First Limit on the Direct Detection of Lightly Ionizing Particles for Electric Charge as Low as e/1000 with the Majorana Demonstrator

Author: Ralph Massarczyk, S. Vasilyev, V. Yumatov, Richard T. Kouzes, I. J. Arnquist, N. W. Ruof, T. Gilliss, Keith Rielage, C. Wiseman, S. R. Elliott, Yu. Efremenko, R. D. Martin, W. Xu, M. A. Howe, Y-D. Chan, G. Othman, Eric W. Hoppe, R. G. H. Robertson, S. I. Konovalov, Walter C. Pettus, A. L. Reine, G. K. Giovanetti, T. S. Caldwell, C. R. Haufe, C. D. Christofferson, C.-H. Yu, J. F. Wilkerson, S. I. Alvis, D. J. Tedeschi, S. J. Meijer, I. S. Guinn, B. X. Zhu, I. Zhitnikov, Matthew Busch, B. Shanks, C. Cuesta, V. E. Guiseppe, C. J. Barton, Pinghan Chu, J. Gruszko, F. E. Bertrand, J. Myslik, Alan Poon, C. Dunagan, Susanne Mertens, Anne-Marie Suriano, M. Buuck, J. A. Detwiler, L. Hehn, M. P. Green, F. T. Avignone, H. Ejiri, R. L. Varner, D. C. Radford, E. Yakushev, Reyco Henning, C.M. O'Shaughnessy, A. M. Lopez, V.B. Brudanin, J. Rager, B. R. White, K. Vorren, M. Shirchenko, and A. S. Barabash
Subjects: Physics, Physics::Instrumentation and Detectors, 010308 nuclear & particles physics, General Physics and Astronomy, 01 natural sciences, Electric charge, Particle detector, Standard Model, Semiconductor detector, Nuclear physics, MAJORANA, Double beta decay, 0103 physical sciences, Grand Unified Theory, High Energy Physics::Experiment, 010306 general physics, Radioactive decay
Abstract: The Majorana Demonstrator is an ultralow-background experiment searching for neutrinoless double-beta decay in ^{76}Ge. The heavily shielded array of germanium detectors, placed nearly a mile underground at the Sanford Underground Research Facility in Lead, South Dakota, also allows searches for new exotic physics. Free, relativistic, lightly ionizing particles with an electrical charge less than e are forbidden by the standard model but predicted by some of its extensions. If such particles exist, they might be detected in the Majorana Demonstrator by searching for multiple-detector events with individual-detector energy depositions down to 1 keV. This search is background-free, and no candidate events have been found in 285 days of data taking. New direct-detection limits are set for the flux of lightly ionizing particles for charges as low as e/1000.
Published: 2018
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10. Recent Results from the Majorana Demonstrator

Author: Eric W. Hoppe, C. R. Haufe, S. I. Alvis, T. S. Caldwell, Ralph Massarczyk, J. A. Detwiler, S. Vasilyev, D. C. Radford, I. Zhitnikov, J. Rager, I. J. Arnquist, N. W. Ruof, C. Dunagan, H. Ejiri, Kai Vetter, C. D. Christofferson, M. F. Kidd, V. Yumatov, Keith Rielage, F. E. Bertrand, Yu. Efremenko, A. W. P. Poon, M. Busch, Chang-Hong Yu, M. P. Green, M. A. Howe, S. I. Konovalov, G. K. Giovanetti, A. S. Barabash, G. Othman, J. Gruszko, C. Cuesta, Pinghan Chu, C. Wiseman, F. T. Avignone, I. S. Guinn, R. L. Varner, B. X. Zhu, W. Xu, Reyco Henning, J. F. Wilkerson, B. Shanks, V. E. Guiseppe, A. M. Lopez, S. R. Elliott, K. J. Keeter, C. J. Barton, D. Tedeschi, B. R. White, T. Gilliss, Y-D. Chan, R. D. Martin, M. Shirchenko, L. Hehn, C.M. O'Shaughnessy, R. G. H. Robertson, Richard T. Kouzes, V.B. Brudanin, J. Myslik, T. Bode, Anne-Marie Suriano, S. J. Meijer, M. Buuck, K. Vorren, Walter C. Pettus, A. L. Reine, Susanne Mertens, and E. Yakushev
Subjects: Particle physics, Physics - Instrumentation and Detectors, Physics beyond the Standard Model, FOS: Physical sciences, Design elements and principles, nucl-ex, 01 natural sciences, 7. Clean energy, Double beta decay, 0103 physical sciences, Nuclear Experiment (nucl-ex), Detector array, 010306 general physics, Nuclear Experiment, physics.ins-det, Physics, 010308 nuclear & particles physics, business.industry, Detector, Instrumentation and Detectors (physics.ins-det), Modular design, MAJORANA, germanium, Production (computer science), Neutrinoless double-beta decay, business, point-contact detectors, Energy (signal processing)
Abstract: The MAJORANA DEMONSTRATOR is an experiment constructed to search for neutrinoless double-beta decay in $^{76}$Ge and to demonstrate the feasibility to deploy a large-scale experiment in a phased and modular fashion. It consists of two modules of natural and $^{76}$Ge-enriched germanium detectors totalling 44.1 kg, operating at the 4850' level of the Sanford Underground Research Facility in Lead, South Dakota, USA. Commissioning of the experiment began in June 2015, followed by data production with the full detector array in August 2016. The ultra-low background and record energy resolution achieved by the MAJORANA DEMONSTRATOR enable a sensitive neutrinoless double-beta decay search, as well as additional searches for physics beyond the Standard Model. I will discuss the design elements that enable these searches, along with the latest results, focusing on the neutrinoless double-beta decay search. I will also discuss the current status and the future plans of the MAJORANA DEMONSTRATOR, as well as the plans for a future tonne-scale $^{76}$Ge experiment., 4 pages. Proceedings of The 39th International Conference on High Energy Physics (ICHEP2018), 4-11 July, 2018, Seoul, Korea. Submitted to Proceedings of Science
Published: 2018

11. Search for Neutrinoless Double- β Decay in Ge76 with the Majorana Demonstrator

Author: S. I. Alvis, D. J. Tedeschi, I. Zhitnikov, J. C. Loach, M. Boswell, J. I. Collar, B. R. Jasinski, J. Myslik, C. O'Shaughnessy, L. E. Leviner, Henning O. Back, J. MacMullin, Kai Vetter, W. Xu, V. Yumatov, I. S. Guinn, D. M. Mei, R. A. Johnson, Ronald L. Brodzinski, M. F. Kidd, Yuen-Dat Chan, T. S. Caldwell, A. W. Bradley, A. S. Caldwell, S. I. Konovalov, E. Aguayo, S. R. Elliott, M. Busch, M. Shirchenko, John L. Orrell, P. H. Chu, G. Othman, Reynold J. Cooper, Ralph Massarczyk, A. Galindo-Uribarri, Craig E. Aalseth, M. C. Ronquest, J. Goett, C. J. Barton, K. T. Lesko, S. Zimmermann, T. Gilliss, J. E. Trimble, D. Steele, C. Wiseman, B. K. Fujikawa, K. Vorren, S. Vasilyev, H. Yaver, J. Gruszko, I. J. Arnquist, N. W. Ruof, Keith Rielage, N. Snyder, P. Finnerty, Alexis G. Schubert, C. D. Christofferson, Harry S. Miley, Paul N. Luke, M. Buuck, M. A. Howe, A. L. Hallin, N. Abgrall, Yu. Efremenko, Alan Poon, J. Rager, Anne-Marie Suriano, Paul Barton, A. B. McDonald, J. A. Detwiler, Jonathan D. Leon, James E. Fast, A. S. Barabash, J. H. Merriman, C. Cuesta, R. Henning, C. R. Haufe, A. Knecht, Erin S. Fuller, F. E. Bertrand, F. T. Avignone, R. L. Varner, Michael G. Marino, D. C. Radford, K. J. Snavely, C.-H. Yu, A. M. Lopez, J.H. Reeves, K. Pushkin, T. Bode, E. Yakushev, P. J. Doe, Walter C. Pettus, Todd W. Hossbach, B. X. Zhu, A. L. Reine, K. J. Keeter, V.B. Brudanin, P. S. Barbeau, Nicole R. Overman, A. R. Young, D. G. Phillips, Brian D. LaFerriere, V. E. Guiseppe, J. A. Dunmore, G. K. Giovanetti, M. L. Miller, R. D. Martin, Eric W. Hoppe, Richard T. Kouzes, Susanne Mertens, R. G. H. Robertson, B. Shanks, Jeremy D. Kephart, Werner Tornow, D. C. Combs, Z. Fu, S.J. J Meijer, B. Bos, F. M. Fraenkle, G. Perumpilly, V. M. Gehman, J. F. Wilkerson, B. R. White, L. Hehn, M. P. Green, S. MacMullin, H. Ejiri, and Mark Amman
Subjects: Physics, Semileptonic decay, 010308 nuclear & particles physics, General Physics and Astronomy, 01 natural sciences, Semiconductor detector, Nuclear physics, Full width at half maximum, MAJORANA, Double beta decay, 0103 physical sciences, Neutrino, 010306 general physics, Neutrino oscillation, Energy (signal processing)
Abstract: The Majorana Collaboration is operating an array of high purity Ge detectors to search for neutrinoless double-β decay in ^{76}Ge. The Majorana Demonstrator comprises 44.1 kg of Ge detectors (29.7 kg enriched in ^{76}Ge) split between two modules contained in a low background shield at the Sanford Underground Research Facility in Lead, South Dakota. Here we present results from data taken during construction, commissioning, and the start of full operations. We achieve unprecedented energy resolution of 2.5 keV FWHM at Q_{ββ} and a very low background with no observed candidate events in 9.95 kg yr of enriched Ge exposure, resulting in a lower limit on the half-life of 1.9×10^{25} yr (90% C.L.). This result constrains the effective Majorana neutrino mass to below 240-520 meV, depending on the matrix elements used. In our experimental configuration with the lowest background, the background is 4.0_{-2.5}^{+3.1} counts/(FWHM t yr).
Published: 2018
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12. The Majorana Demonstrator Status and Preliminary Results

Author: F. E. Bertrand, W. Xu, F. T. Avignone, G. K. Giovanetti, C. J. Barton, R. L. Varner, Reyco Henning, Ralph Massarczyk, A. M. Lopez, M. Buuck, T. Gilliss, Alan Poon, Anne-Marie Suriano, J. A. Detwiler, D. J. Tedeschi, S. Vasilyev, S. I. Konovalov, Eric W. Hoppe, C. Wiseman, R. D. Martin, T. S. Caldwell, Pinghan Chu, J. Myslik, A. S. Barabash, Walter C. Pettus, C. Dunagan, Richard T. Kouzes, Kai Vetter, V. Yumatov, Keith Rielage, I. J. Arnquist, N. W. Ruof, C.-H. Yu, C. D. Christofferson, J. Gruszko, S. R. Elliott, B. Shanks, M. F. Kidd, V. E. Guiseppe, S. Mertens, L. Hehn, M. P. Green, B. R. White, Yuen-Dat Chan, H. Ejiri, E. Yakushev, K. Vorren, M. A. Howe, G. Othman, J. Rager, J. F. Wilkerson, D. C. Radford, S. J. Meijer, I. S. Guinn, A. L. Reine, B. Z. Zhu, K. J. Keeter, V.B. Brudanin, M. Shirchenko, T. Bode, Yu. Efremenko, C. R. Haufe, S. I. Alvis, C. Cuesta, I. Zhitnikov, Matthew Busch, and Sun, Yang
Subjects: Physics, Particle physics, Physics - Instrumentation and Detectors, 010308 nuclear & particles physics, Physics::Instrumentation and Detectors, QC1-999, Detector, High Energy Physics::Phenomenology, FOS: Physical sciences, Instrumentation and Detectors (physics.ins-det), nucl-ex, 7. Clean energy, 01 natural sciences, Lepton number, MAJORANA, 0103 physical sciences, High Energy Physics::Experiment, Neutrino, Nuclear Experiment (nucl-ex), 010306 general physics, Nuclear Experiment, physics.ins-det
Abstract: The Majorana Collaboration is using an array of high-purity Ge detectors to search for neutrinoless double-beta decay in 76Ge. Searches for neutrinoless double-beta decay are understood to be the only viable experimental method for testing the Majorana nature of the neutrino. Observation of this decay would imply violation of lepton number, that neutrinos are Majorana in nature, and provide information on the neutrino mass. The Majorana Demonstrator comprises 44.1 kg of p-type point-contact Ge detectors (29.7 kg enriched in 76Ge) surrounded by a low-background shield system. The experiment achieved a high efficiency of converting raw Ge material to detectors and an unprecedented detector energy resolution of 2.5 keV FWHM at Q$_{\beta\beta}$. The Majorana collaboration began taking physics data in 2016. This paper summarizes key construction aspects of the Demonstrator and shows preliminary results from initial data., Comment: 5 pages, 2 figures. Proceeding for the "16th International Symposium on Capture Gamma-Ray Spectroscopy and Related Topics (CGS16)", 18-22 September 2017
Published: 2018
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13. Low Background Materials and Fabrication Techniques for Cables and Connectors in the Majorana Demonstrator

Author: T. Gilliss, R. D. Martin, R. G. H. Robertson, C. J. Barton, V.B. Brudanin, G. K. Giovanetti, B. Shanks, V. E. Guiseppe, I. J. Arnquist, J. F. Wilkerson, S. J. Meijer, A. S. Barabash, B. R. White, Keith Rielage, M. Busch, Eric W. Hoppe, M. A. Howe, Kai Vetter, C.M. O'Shaughnessy, C. D. Christofferson, F. T. Avignone, A. W. P. Poon, M. Shirchenko, K. Vorren, T. S. Caldwell, M. F. Kidd, J. Rager, H. Ejiri, Steven Elliott, V. Yumatov, A. L. Reine, Yu. Efremenko, C. Wiseman, I. S. Guinn, Reyco Henning, A. M. Lopez, D. C. Radford, Chang-Hong Yu, J. Myslik, Susanne Mertens, E. Yakushev, M. Buuck, N. W. Rouf, C. Cuesta, W. Xu, Y-D. Chan, Richard T. Kouzes, Ralph Massarczyk, S. Vasilyev, N. Abgrall, A. W. Bradley, Anne-Marie Suriano, T. Bode, M. P. Green, J. Gruszko, C. R. Haufe, S. I. Alvis, I. Zhitnikov, K. J. Keeter, D. Tedeschi, L. Hehn, J. E. Trimble, G. Othman, Pinghan Chu, F. E. Bertrand, S. I. Konovalov, B. X. Zhu, J. A. Detwiler, C. Dunagan, and R. L. Varner
Subjects: Cryostat, MAJORANA, Fabrication, Reliability (semiconductor), Upgrade, Physics - Instrumentation and Detectors, Computer science, Detector, Systems engineering, FOS: Physical sciences, Electronics, Instrumentation and Detectors (physics.ins-det), physics.ins-det
Abstract: The MAJORANA Collaboration is searching for the neutrinoless double-beta decay of the nucleus Ge-76. The MAJORANA DEMONSTRATOR is an array of germanium detectors deployed with the aim of implementing background reduction techniques suitable for a tonne scale Ge-76-based search (the LEGEND collaboration). In the DEMONSTRATOR, germanium detectors operate in an ultra-pure vacuum cryostat at 80 K. One special challenge of an ultra-pure environment is to develop reliable cables, connectors, and electronics that do not significantly contribute to the radioactive background of the experiment. This paper highlights the experimental requirements and how these requirements were met for the MAJORANA DEMONSTRATOR, including plans to upgrade the wiring for higher reliability in the summer of 2018. Also described are requirements for LEGEND R&D efforts underway to meet these additional requirements., Proceedings of LRT 2017
Published: 2017
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14. Background Model for the Majorana Demonstrator

Author: S. R. Elliott, N. Snyder, M. F. Kidd, Yuen-Dat Chan, A. Hegai, M. A. Howe, A. W. P. Poon, Nicole R. Overman, A. S. Caldwell, C.-H. Yu, Yuri Efremenko, V. V. Timkin, M. P. Green, J. Gruszko, J. F. Wilkerson, S. J. Meijer, C.M. O'Shaughnessy, Jeffrey K. Thompson, J. Goett, B. Shanks, P. Finnerty, V. E. Guiseppe, K. Pushkin, B. R. White, H. Ejiri, Masaharu Nomachi, A. Galindo-Uribarri, Keith Rielage, Richard T. Kouzes, S. Vasilyev, J. Rager, Matthew Busch, O.I. Kochetov, Jonathan D. Leon, A. L. Hallin, N. Abgrall, D. Byram, J. E. Trimble, D. C. Combs, K. N. Gusev, W. Xu, D. C. Radford, Tatsushi Shima, R. D. Martin, V. Egorov, C. Wiseman, R. G. H. Robertson, Alexis G. Schubert, Eric W. Hoppe, L. E. Leviner, F. M. Fraenkle, Kai Vetter, G. K. Giovanetti, K. Vorren, J. MacMullin, Ryuta Hazama, J. C. Loach, C. D. Christofferson, Werner Tornow, E. Aguayo, Vladimir Yumatov, Stanley M. Howard, A. R. Young, Susanne Mertens, A. S. Barabash, S. MacMullin, P. J. Doe, F. E. Bertrand, M. Boswell, K. J. Keeter, V.B. Brudanin, F. T. Avignone, R. L. Varner, M. Shirchenko, Reyco Henning, John L. Orrell, Brian D. LaFerriere, E. Romero-Romero, D. G. Phillips, James E. Fast, C. Cuesta, E. Yakushev, M. C. Ronquest, S. I. Konovalov, K. J. Snavely, Anne-Marie Suriano, and J. A. Detwiler
Subjects: Physics, majorana, business.industry, Physics and Astronomy(all), germanium detector, neutrinoless double beta decay, Semiconductor detector, Reduction (complexity), Point contact, MAJORANA, Double beta decay, Pulse shape analysis, Aerospace engineering, Neutrino, Hpge detector, business
Abstract: The Majorana Collaboration is constructing a system containing 40kg of HPGe detectors to demonstrate the feasibility and potential of a future tonne-scale experiment capable of probing the neutrino mass scale in the inverted-hierarchy region. To realize this, a major goal of the Majorana Demonstrator is to demonstrate a path forward to achieving a background rate at or below 1 cnt/(ROI-t-y) in the 4 keV region of interest around the Q-value at 2039 keV. This goal is pursued through a combination of a significant reduction of radioactive impurities in construction materials with analytical methods for background rejection, for example using powerful pulse shape analysis techniques profiting from the p-type point contact HPGe detectors technology. The effectiveness of these methods is assessed using simulations of the different background components whose purity levels are constrained from radioassay measurements.
Published: 2015
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15. The Majorana Low-noise Low-background Front-end Electronics

Author: L. E. Leviner, Yuen-Dat Chan, E. Aguayo, D. C. Radford, W. Xu, Eric W. Hoppe, Masaharu Nomachi, A. Hegai, C.M. O'Shaughnessy, M. A. Howe, Matthew Busch, K. J. Snavely, J. E. Trimble, Nicole R. Overman, O.I. Kochetov, J. Rager, D. Byram, K. Pushkin, J. MacMullin, P. J. Doe, A. S. Caldwell, J. Goett, S. MacMullin, D. C. Combs, S. R. Elliott, Kai Vetter, C.-H. Yu, C. D. Christofferson, B. Shanks, Keith Rielage, V. E. Guiseppe, K. J. Keeter, C. Wiseman, J. Gruszko, V. V. Timkin, V. G. Egorov, V.B. Brudanin, M. Shirchenko, K. Vorren, Ryuta Hazama, John L. Orrell, Alexis G. Schubert, M. P. Green, F. E. Bertrand, H. Ejiri, M. Boswell, Jeffrey K. Thompson, J. F. Wilkerson, Vladimir Yumatov, R. D. Martin, Stanley M. Howard, A. R. Young, P. Finnerty, Yu. Efremenko, K. N. Gusev, E. Romero-Romero, B. R. White, R. G. H. Robertson, M. C. Ronquest, D. G. Phillips, F. T. Avignone, R. L. Varner, Brian D. LaFerriere, Werner Tornow, F. M. Fraenkle, Reyco Henning, M. F. Kidd, James E. Fast, Jonathan D. Leon, C. Cuesta, A. S. Barabash, Richard T. Kouzes, S. I. Konovalov, Alan Poon, Anne-Marie Suriano, J. A. Detwiler, E. Yakushev, N. Snyder, Susanne Mertens, A. Galindo-Uribarri, S. J. Meijer, S. Vasilyev, A. L. Hallin, N. Abgrall, Tatsushi Shima, G. K. Giovanetti, and J. C. Loach
Subjects: Physics, business.industry, Detector, chemistry.chemical_element, Germanium, Substrate (electronics), Physics and Astronomy(all), Noise (electronics), Capacitance, neutrinoless double beta decay, law.invention, Nuclear physics, MAJORANA, low noise, chemistry, law, Double beta decay, low background, Optoelectronics, charge sensitive amplifer, Resistor, business, resistive-feedback front-end
Abstract: The MAJORANA DEMONSTRATOR will search for the neutrinoless double beta decay (ββ(0ν)) of the isotope 76Ge with a mixed array of enriched and natural germanium detectors. In view of the next generation of tonne-scale germanium-based ββ(0ν)-decay searches, a major goal of the MAJORANA DEMONSTRATOR is to demonstrate a path forward to achieving a background rate at or below 1 cnt/(ROI-t-y) in the 4 keV region of interest (ROI) around the 2039-keV Q-value of the 76Ge ββ(0ν)-decay. Such a requirement on the background level significantly constrains the design of the readout electronics, which is further driven by noise and energy resolution performances. We present here the low-noise low- background front-end electronics developed for the low-capacitance p-type point contact (P-PC) germanium detectors of the MAJORANA DEMONSTRATOR. This resistive-feedback front-end, specifically designed to have low mass, is fabricated on a radioassayed fused-silica substrate where the feedback resistor consists of a sputtered thin film of high purity amorphous germanium and the feedback capacitor is based on the capacitance between gold conductive traces.
Published: 2015
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16. Testing the Ge Detectors for the MAJORANA DEMONSTRATOR

Author: D. C. Radford, Yu. Efremenko, R. D. Martin, E. Romero-Romero, R. G. H. Robertson, D. G. Phillips, Reyco Henning, James E. Fast, V. Egorov, Nicole R. Overman, G. K. Giovanetti, P. J. Doe, C. Cuesta, D. Byram, M. Shirchenko, Brian D. LaFerriere, John L. Orrell, J. Rager, C. Wiseman, Albert Young, B. Shanks, V. E. Guiseppe, J. MacMullin, W. Xu, Keith Rielage, Eric W. Hoppe, Alexis G. Schubert, J. Gruszko, N. Snyder, A. Hegai, V. Brudanin, S. MacMullin, Anne-Marie Suriano, Y-D. Chan, K. Pushkin, M. A. Howe, K. J. Snavely, K. N. Gusev, M. Boswell, A. W. P. Poon, Susanne Mertens, E. Yakushev, Richard T. Kouzes, K. Vorren, Kai Vetter, L. E. Leviner, F. E. Bertrand, C. D. Christofferson, M. F. Kidd, O.I. Kochetov, Stanley M. Howard, Masaharu Nomachi, M. P. Green, J. C. Loach, V. V. Timkin, J. A. Detwiler, M. Busch, Jeffrey K. Thompson, Ryuta Hazama, F. T. Avignone, Jonathan D. Leon, E. Aguayo, J. E. Trimble, S. J. Meijer, R. L. Varner, J. Goett, K. J. Keeter, Werner Tornow, M. C. Ronquest, S. I. Konovalov, Chang-Hong Yu, A. S. Caldwell, C.M. O'Shaughnessy, V. Yumatov, A. Galindo-Uribarri, S. Vasilyev, A. L. Hallin, N. Abgrall, Tatsushi Shima, A. S. Barabash, H. Ejiri, Steven Elliott, D. C. Combs, J. F. Wilkerson, P. Finnerty, B. R. White, and F. M. Fraenkle
Subjects: Physics - Instrumentation and Detectors, majorana, FOS: Physical sciences, chemistry.chemical_element, Germanium, Physics and Astronomy(all), germanium detector, Capacitance, neutrinoless double beta decay, Crystal, Nuclear physics, Double beta decay, Nuclear Experiment (nucl-ex), Nuclear Experiment, Physics, business.industry, Detector, Instrumentation and Detectors (physics.ins-det), Semiconductor detector, Characterization (materials science), MAJORANA, chemistry, Optoelectronics, High Energy Physics::Experiment, business
Abstract: High purity germanium (HPGe) crystals will be used for the MAJORANA DEMONSTRATOR, where they serve as both the source and the detector for neutrinoless double beta decay. It is crucial for the experiment to understand the performance of the HPGe crystals. A variety of crystal properties are being investigated, including basic properties such as energy resolution, efficiency, uniformity, capacitance, leakage current and crystal axis orientation, as well as more sophisticated properties, e.g. pulse shapes and dead layer and transition layer distributions. In this paper, we will present our measurements that characterize the HPGe crystals. We will also discuss our simulation package for the detector characterization setup, and show that additional information can be extracted from data-simulation comparisons., Comment: To appear in the Proceedings of the 13th International Conference on Topics in Astroparticle and Underground Physics, TAUP 2013 (F. Avignone & W. Haxton, editors, Physics Procedia, Elsevier)
Published: 2015
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17. The status and initial results of the Majorana demonstrator experiment

Author: V. Yumatov, Yu. Efremenko, V.B. Brudanin, Anne-Marie Suriano, M. Busch, Ralph Massarczyk, Keith Rielage, F. T. Avignone, S. Vasilyev, R. L. Varner, Reyco Henning, A. M. Lopez, J. E. Trimble, N. Abgrall, J. A. Detwiler, Pinghan Chu, C. Dunagan, D. C. Radford, K. J. Keeter, G. Othman, D. Tedeschi, C. J. Barton, G. K. Giovanetti, I. J. Arnquist, L. Hehn, Eric W. Hoppe, T. S. Caldwell, C. Wiseman, B. Shanks, T. Bode, V. E. Guiseppe, J. Gruszko, A. W. P. Poon, N. W. Rouf, T. Gilliss, F. E. Bertrand, R. D. Martin, A. W. Bradley, J. Myslik, S. I. Konovalov, B. X. Zhu, R. G. H. Robertson, Chang-Hong Yu, C.M. O'Shaughnessy, I. S. Guinn, C. R. Haufe, S. I. Alvis, I. Zhitnikov, J. Rager, H. Ejiri, Steven Elliott, M. A. Howe, J. F. Wilkerson, B. R. White, M. Shirchenko, C. Cuesta, W. Xu, Y-D. Chan, M. P. Green, K. Vorren, M. Buuck, S. J. Meijer, A. L. Reine, Susanne Mertens, E. Yakushev, Kai Vetter, C. D. Christofferson, M. F. Kidd, Richard T. Kouzes, and A. S. Barabash
Subjects: Physics, Particle physics, MAJORANA, Physics - Instrumentation and Detectors, Detector, FOS: Physical sciences, Instrumentation and Detectors (physics.ins-det), Nuclear Experiment (nucl-ex), Neutrino, nucl-ex, Nuclear Experiment, physics.ins-det, Lepton
Abstract: Neutrinoless double-beta decay searches play a major role in determining the nature of neutrinos, the existence of a lepton violating process, and the effective Majorana neutrino mass. The MAJORANA Collaboration assembled an array of high purity Ge detectors to search for neutrinoless double-beta decay in Ge-76. The MAJORANA DEMONSTRATOR is comprised of 44.1 kg (29.7 kg enriched in Ge-76) of Ge detectors divided between two modules contained in a low-background shield at the Sanford Underground Research Facility in Lead, South Dakota, USA. The initial goals of the DEMONSTRATOR are to establish the required background and scalability of a Ge-based next-generation ton-scale experiment. Following a commissioning run that started in 2015, the first detector module started low-background data production in early 2016. The second detector module was added in August 2016 to begin operation of the entire array. We discuss results of the initial physics runs, as well as the status and physics reach of the full MAJORANA DEMONSTRATOR experiment., Proceedings of the MEDEX'17 meeting (Prague, May 29 - June 2, 2017)
Published: 2017
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18. Status of the Majorana Demonstrator

Author: B. R. Jasinski, Jonathan D. Leon, M. Buuck, K. Vorren, C.-H. Yu, V. V. Timkin, J. MacMullin, C. Schmitt, R. D. Martin, I. J. Arnquist, N. Snyder, M. F. Kidd, J. Gruszko, C.M. O'Shaughnessy, A. S. Barabash, Yuen-Dat Chan, R. G. H. Robertson, Eric W. Hoppe, M. Shirchenko, A. W. P. Poon, G. K. Giovanetti, John L. Orrell, F. E. Bertrand, A. Galindo-Uribarri, J. Goett, Nicole R. Overman, M. A. Howe, I. S. Guinn, S. I. Konovalov, S. J. Meijer, S. Vasilyev, Anne-Marie Suriano, Keith Rielage, J. A. Detwiler, B. Shanks, V. E. Guiseppe, K. J. Keeter, V.B. Brudanin, W. Xu, Brian D. LaFerriere, N. Abgrall, D. Byram, C. Wiseman, E. Yakushev, S. R. Elliott, Yuri Efremenko, D. C. Radford, Susanne Mertens, C. D. Christofferson, Vladimir Yumatov, Stanley M. Howard, J. E. Trimble, F. T. Avignone, R. L. Varner, Reyco Henning, D. Tedeschi, J. Rager, A. S. Caldwell, J. F. Wilkerson, Matthew Busch, B. R. White, M. P. Green, E. Romero-Romero, H. Ejiri, C. Cuesta, Richard T. Kouzes, and Kai Vetter
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Physics::Instrumentation and Detectors, business.industry, Modular design, Semiconductor detector, Nuclear physics, MAJORANA, Double beta decay, High Energy Physics::Experiment, Mass scale, Neutrino, Detector array, Nuclear Experiment, business
Abstract: The Majorana Collaboration is constructing the Majorana Demonstrator , an ultra-low background, 40-kg modular high purity Ge detector array to search for neutrinoless double-beta decay in 76Ge. In view of the next generation of tonne-scale Ge-based neutrinoless double-beta decay searches that will probe the neutrino mass scale in the inverted-hierarchy region, a major goal of the Demonstrator is to demonstrate a path forward to achieving a background rate at or below 1 count/tonne/year in the 4 keV region of interest around the Q-value at 2039 keV. The current status of the Demonstrator is discussed, as are plans for its completion.
Published: 2015
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19. Characteristics of signals originating near the lithium-diffused N+ contact of high purity germanium p-type point contact detectors

Author: Yu. Efremenko, M. L. Miller, D. G. Phillips, R. D. Martin, V. Egorov, James E. Fast, G. Perumpilly, V. M. Gehman, R. G. H. Robertson, C.-H. Yu, V. V. Timkin, Alexis G. Schubert, J. Esterline, K. J. Snavely, D. C. Radford, Yuen-Dat Chan, E. Yakushev, M. Shirchenko, J. F. Wilkerson, Eric W. Hoppe, Nicole R. Overman, P. Finnerty, N. Fields, M. C. Ronquest, J. H. Merriman, O.I. Kochetov, G. K. Giovanetti, John L. Orrell, Vladimir Yumatov, Michael G. Marino, V. E. Guiseppe, Stanley M. Howard, J. C. Loach, A. R. Young, Masaharu Nomachi, M. A. Howe, Reynold J. Cooper, C. D. Christofferson, Mark Amman, D. C. Combs, L. Mizouni, Matthew Busch, P. J. Doe, F. M. Fraenkle, S. I. Konovalov, A. Knecht, Kai Vetter, Keith Rielage, Brian D. LaFerriere, J. I. Collar, R. A. Johnson, Ryuta Hazama, Q. Looker, J. A. Detwiler, Jonathan D. Leon, Tatsushi Shima, S. R. Elliott, L. E. Leviner, M. Horton, Richard T. Kouzes, Werner Tornow, S. MacMullin, J. R. Beene, F. E. Bertrand, M. Boswell, Paul Barton, E. Aguayo, M. F. Kidd, M. P. Green, H. Ejiri, K. J. Keeter, V.B. Brudanin, A. Galindo-Uribarri, J. Strain, H. Yaver, D. Steele, A. L. Hallin, Paul N. Luke, A. W. P. Poon, F. T. Avignone, R. L. Varner, Reyco Henning, A. S. Barabash, K. Gusey, and K. Vorren
Subjects: Physics, Novel technique, Nuclear and High Energy Physics, business.industry, Detector, Dead layer, chemistry.chemical_element, Germanium, Semiconductor detector, Point contact, Partial charge, chemistry, Energy spectrum, Optoelectronics, High Energy Physics::Experiment, Nuclear Experiment, business, Instrumentation
Abstract: A study of signals originating near the lithium-diffused n+ contact of p-type point contact (PPC) high purity germanium detectors (HPGe) is presented. The transition region between the active germanium and the fully dead layer of the n+ contact is examined. Energy depositions in this transition region are shown to result in partial charge collection. This provides a mechanism for events with a well defined energy to contribute to the continuum of the energy spectrum at lower energies. A novel technique to quantify the contribution from this source of background is introduced. Experiments that operate germanium detectors with a very low energy threshold may benefit from the methods presented herein.
Published: 2013
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20. The Majorana Demonstrator radioassay program

Author: T. Gilliss, M. L. Miller, C. D. Christofferson, J. Goett, R. D. Martin, N. Abgrall, Ralph Massarczyk, A. Galindo-Uribarri, J. Gruszko, A. S. Caldwell, R. G. H. Robertson, Stanley M. Howard, M. P. Green, Nicole R. Overman, W. Xu, Kai Vetter, H. Ejiri, S. Meijer, C.-H. Yu, B. R. Jasinski, Anne-Marie Suriano, J. A. Detwiler, J. E. Trimble, V. E. Guiseppe, V. M. Gehman, F. T. Avignone, B. Shanks, R. L. Varner, K. Vorren, I. S. Guinn, Reyco Henning, D. C. Radford, O.I. Kochetov, K. J. Snavely, Eric W. Hoppe, R. A. Johnson, M. F. Kidd, Keith Rielage, Yuen-Dat Chan, A. W. Bradley, S. Vasilyev, D. Byram, M. Buuck, S. I. Konovalov, Henning O. Back, G. K. Giovanetti, K. Pushkin, I. Zhitnikov, Matthew Busch, M. A. Howe, J. F. Wilkerson, J. C. Loach, Pinghan Chu, D. J. Tedeschi, Richard T. Kouzes, A. S. Barabash, Jonathan D. Leon, S. MacMullin, P. Finnerty, B. R. White, C. Wiseman, K. J. Keeter, V.B. Brudanin, J. Rager, J. MacMullin, Alexis G. Schubert, V. Yumatov, C. O'Shaughnessy, S. R. Elliott, J. A. Dunmore, E. Yakushev, Susanne Mertens, M. C. Ronquest, E. Romero-Romero, Yu. Efremenko, C. Cuesta, Brian D. LaFerriere, M. Shirchenko, John L. Orrell, F. E. Bertrand, M. Boswell, D. Steele, I. J. Arnquist, N. Snyder, and A. W. P. Poon
Subjects: Nuclear and High Energy Physics, Physics - Instrumentation and Detectors, FOS: Physical sciences, Context (language use), Radiopurity, nucl-ex, 7. Clean energy, 01 natural sciences, Atomic, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), Mass spectroscopy, Particle and Plasma Physics, Germanium counting, Double beta decay, 0103 physical sciences, Nuclear, Nuclear Experiment (nucl-ex), Neutron activation analysis, 010306 general physics, Nuclear Experiment, Instrumentation, physics.ins-det, Low background, Physics, MAJORANA, Mass spectrometry, 010308 nuclear & particles physics, hep-ex, Detector, Molecular, Trace analysis, Instrumentation and Detectors (physics.ins-det), Nuclear & Particles Physics, Semiconductor detector, Other Physical Sciences, Astronomical and Space Sciences, Neutron activation
Abstract: The MAJORANA collaboration is constructing the MAJORANA DEMONSTATOR at the Sanford Underground Research Facility at the Homestake gold mine, in Lead, SD. The apparatus will use Ge detectors, enriched in isotope \nuc{76}{Ge}, to demonstrate the feasibility of a large-scale Ge detector experiment to search for neutrinoless double beta decay. The long half-life of this postulated process requires that the apparatus be extremely low in radioactive isotopes whose decays may produce backgrounds to the search. The radioassay program conducted by the collaboration to ensure that the materials comprising the apparatus are sufficiently pure is described. The resulting measurements of the radioactive-isotope contamination for a number of materials studied for use in the detector are reported., to be submitted to NIM
Published: 2016

21. Muon Flux Measurements at the Davis Campus of the Sanford Underground Research Facility with the Majorana Demonstrator Veto System

Author: Jonathan D. Leon, C. Schmitt, J. Gruszko, T. Gilliss, A. S. Barabash, I. S. Guinn, R. D. Martin, B. R. Jasinski, Keith Rielage, W. Xu, E. Aguayo, Brian D. LaFerriere, R. G. H. Robertson, J. MacMullin, Yu. Efremenko, C. Wiseman, M. P. Green, V. Yumatov, D. Byram, C. Dunagan, C.-H. Yu, E. Romero-Romero, A. W. Bradley, S. R. Elliott, H. Ejiri, J. F. Wilkerson, Ralph Massarczyk, A. Galindo-Uribarri, M. F. Kidd, Nicole R. Overman, D. J. Tedeschi, B. R. White, C. Cuesta, Yuen-Dat Chan, S. Vasilyev, N. Abgrall, J. Goett, Eric W. Hoppe, M. Shirchenko, I. Zhitnikov, Matthew Busch, John L. Orrell, B. Shanks, K. J. Keeter, V.B. Brudanin, V. E. Guiseppe, K. Vorren, J. E. Trimble, Susanne Mertens, Kai Vetter, Pinghan Chu, C.M. O'Shaughnessy, C. D. Christofferson, F. E. Bertrand, F. T. Avignone, M. A. Howe, R. L. Varner, J. Rager, Reyco Henning, D. C. Radford, A. M. Lopez, A. S. Caldwell, S. I. Konovalov, G. K. Giovanetti, Richard T. Kouzes, Stanley M. Howard, S. J. Meijer, M. Buuck, E. Yakushev, M. C. Ronquest, Alan Poon, Anne-Marie Suriano, J. A. Detwiler, and N. Snyder
Subjects: Physics - Instrumentation and Detectors, Ray, Veto, Flux, FOS: Physical sciences, nucl-ex, 01 natural sciences, Atomic, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), Particle and Plasma Physics, 0103 physical sciences, Nuclear, Nuclear Experiment (nucl-ex), 010306 general physics, physics.ins-det, Nuclear Experiment, Physics, Muon, 010308 nuclear & particles physics, hep-ex, Molecular, Astronomy and Astrophysics, Instrumentation and Detectors (physics.ins-det), Nuclear & Particles Physics, MAJORANA, Muon flux, Cosmic, Astronomical and Space Sciences
Abstract: We report the first measurement of the total MUON flux underground at the Davis Campus of the Sanford Underground Research Facility at the 4850 ft level. Measurements were done with the Majorana Demonstrator veto system arranged in two different configurations. The measured total flux is (5.31+/-0.17) x 10^-9 muons/s/cm^2., 15 pages, 7 figures
Published: 2016
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22. New limits on Bosonic Dark Matter, Solar Axions, Pauli Exclusion Principle Violation, and Electron Decay from the Majorana Demonstrator

Author: M. P. Green, H. Ejiri, W. Xu, Eric W. Hoppe, J. Goett, Kai Vetter, M. Shirchenko, C. R. Haufe, C. D. Christofferson, D. C. Radford, I. Zhitnikov, Matthew Busch, Keith Rielage, T. Gilliss, K. Vorren, I. J. Arnquist, I. S. Guinn, Richard T. Kouzes, R. D. Martin, C. Dunagan, C.-H. Yu, Yu. Efremenko, Stanley M. Howard, J. Rager, A. S. Barabash, R. G. H. Robertson, T. S. Caldwell, A. L. Reine, C. Cuesta, S. I. Konovalov, C. Wiseman, G. K. Giovanetti, D. J. Tedeschi, B. Shanks, V. E. Guiseppe, B. R. White, V. Yumatov, E. Yakushev, J. F. Wilkerson, Yuen-Dat Chan, S. R. Elliott, M. F. Kidd, B. X. Zhu, F. E. Bertrand, M. A. Howe, C.M. O'Shaughnessy, Alan Poon, Anne-Marie Suriano, J. A. Detwiler, J. MacMullin, J. Gruszko, J. E. Trimble, Pinghan Chu, M. Buuck, S. J. Meijer, Susanne Mertens, K. J. Keeter, V.B. Brudanin, F. T. Avignone, R. L. Varner, Reyco Henning, A. M. Lopez, B. R. Jasinski, A. W. Bradley, Ralph Massarczyk, S. Vasilyev, and N. Abgrall
Subjects: Physics, Particle physics, Physics - Instrumentation and Detectors, 010308 nuclear & particles physics, Dark matter, High Energy Physics::Phenomenology, General Physics and Astronomy, FOS: Physical sciences, Electron, Instrumentation and Detectors (physics.ins-det), 01 natural sciences, Vector boson, Pseudoscalar, Nuclear physics, symbols.namesake, MAJORANA, Pauli exclusion principle, WIMP, 0103 physical sciences, symbols, Nuclear Experiment (nucl-ex), 010306 general physics, Nuclear Experiment, Axion
Abstract: We present new limits on exotic keV-scale physics based on 478 kg d of MAJORANA DEMONSTRATOR commissioning data. Constraints at the 90% confidence level are derived on bosonic dark matter (DM) and solar axion couplings, Pauli exclusion principle violating (PEPV) decay, and electron decay using monoenergetic peak signal-limits above our background. Our most stringent DM constraints are set for 11.8 keV mass particles, limiting $g_{Ae} 1.2 \times 10^{24}\;$yr for $e^- \rightarrow$ invisible.
Published: 2016
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23. Modeling and Prediction of SIB Prostate IMRT Plans

Author: K. Vorren, Y. Ge, Joseph K. Salama, H. Song, Michael J. Kelley, and Qiuwen Wu
Subjects: Cancer Research, medicine.medical_specialty, Radiation, medicine.anatomical_structure, Oncology, business.industry, Prostate, Medicine, Radiology, Nuclear Medicine and imaging, Medical physics, business
Published: 2018
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24. The dedicated interferometer for rapid variability

Author: L. Owen, E. R. Kirbach, K. Vorren, D. Hutchinson, J. D. Cline, M. Brown, Michael W. Castelaz, A. T. Castelaz, C. A. Bennett, J. K. Daugherty, Brian Dennison, D. Moffett, W. A. Christiansen, M. Blake, C. Kaltreider, and C. Osborne
Subjects: Physics, Interferometry, Scintillation, Primary (astronomy), Large population, Astronomy, Astronomy and Astrophysics, Instrumentation, Science education
Abstract: A project is underway to develop a two-element interferometer for dedicated monitoring of compact radio sources. The primary goal will involve long-term, fully-sampled monitoring of a large population of extragalactic sources to study interstellar scintillation and search for extreme scattering events. The interferometer will make use of two existing 26-metre antennas with an east-west separation of about 400 metres at the Pisgah Astronomical Research Institute, in partnership with the Pisgah Astronomical Research and Science Education Centre, an interinstitutional centre of the University of North Carolina system.
Published: 2007
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25. Status of the MAJORANA DEMONSTRATOR: A Search for Neutrinoless Double-Beta Decay

Author: Kai Vetter, G. K. Giovanetti, Brian D. LaFerriere, M. P. Green, J. Rager, I. S. Guinn, Howe, D. Byram, V. B. Brudanin, H. Ejiri, Alan Poon, Anne-Marie Suriano, J. A. Detwiler, Yuen-Dat Chan, T. Gilliss, A. S. Barabash, B. R. Jasinski, J. F. Wilkerson, F. E. Bertrand, R. D. Martin, E. Yakushev, I. J. Arnquist, N. Snyder, E. Romero-Romero, R. G. H. Robertson, Keith Rielage, Richard T. Kouzes, B. R. White, S. J. Meijer, C. D. Christofferson, M. F. Kidd, W. Xu, C. O'Shaughnessy, J. E. Trimble, Vladimir Yumatov, Stanley M. Howard, J. Gruszko, B. Shanks, V. E. Guiseppe, S. Mertens, C. Wiseman, M. Buuck, A. W. Bradley, F. T. Avignone, C. X. Baldenegro-Barrera, R. L. Varner, Eric W. Hoppe, Jonathan D. Leon, C.-H. Yu, A. Galindo-Uribarri, Reyco Henning, S. Vasilyev, D. J. Tedeschi, N. Abgrall, J. MacMullin, C. Cuesta, K. Vorren, M. Shirchenko, John L. Orrell, K. J. Keeter, I. Zhitnikov, Matthew Busch, A. S. Caldwell, J. Goett, S. I. Konovalov, Yu. Efremenko, S. R. Elliott, and D. C. Radford
Subjects: Physics, MAJORANA, Particle physics, Double beta decay
Published: 2015
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26. The Majorana Demonstrator: A Search for Neutrinoless Double-beta Decay of 76Ge

Author: F. T. Avignone, R. L. Varner, Reyco Henning, C. Wiseman, A. S. Caldwell, J. Gruszko, K. Vorren, K. J. Keeter, C.-H. Yu, M. P. Green, D. C. Radford, M. C. Ronquest, J. MacMullin, Yuen-Dat Chan, Susanne Mertens, Brian D. LaFerriere, H. Ejiri, Yu. Efremenko, R. D. Martin, D. J. Tedeschi, E. Romero-Romero, J. E. Trimble, S. I. Konovalov, Eric W. Hoppe, Vladimir Yumatov, Stanley M. Howard, S. J. Meijer, M. A. Howe, M. F. Kidd, Matthew Busch, C. Cuesta, J. Goett, R. G. H. Robertson, E. Yakushev, M. Shirchenko, John L. Orrell, V. B. Brudanin, C. D. Christofferson, G. K. Giovanetti, M. Buuck, N. Snyder, Nicole R. Overman, F. E. Bertrand, Keith Rielage, Alan Poon, Anne-Marie Suriano, J. A. Detwiler, B. Shanks, V. E. Guiseppe, A. S. Barabash, B. R. Jasinski, J. F. Wilkerson, B. R. White, A. Galindo-Uribarri, J. Rager, S. Vasilyev, W. Xu, N. Abgrall, S. R. Elliott, C.M. O'Shaughnessy, Richard T. Kouzes, Kai Vetter, D. Byram, I. S. Guinn, and Jonathan D. Leon
Subjects: Physics, History, Antiparticle, Particle physics, Physics - Instrumentation and Detectors, High Energy Physics::Phenomenology, FOS: Physical sciences, Fermion, Electron, Instrumentation and Detectors (physics.ins-det), Lepton number, Computer Science Applications, Education, MAJORANA, Double beta decay, Neutron, High Energy Physics::Experiment, Neutrino, Nuclear Experiment (nucl-ex), Nuclear Experiment
Abstract: Neutrinoless double-beta decay is a hypothesized process where in some even-even nuclei it might be possible for two neutrons to simultaneously decay into two protons and two electrons without emitting neutrinos. This is possible only if neutrinos are Majorana particles, i.e. fermions that are their own antiparticles. Neutrinos being Majorana particles would explicitly violate lepton number conservation, and might play a role in the matter-antimatter asymmetry in the universe. The observation of neutrinoless double-beta decay would also provide complementary information related to neutrino masses. The Majorana Collaboration is constructing the Majorana Demonstrator, a 40-kg modular germanium detector array, to search for the Neutrinoless double-beta decay of 76Ge and to demonstrate a background rate at or below 3 counts/(ROI-t-y) in the 4 keV region of interest (ROI) around the 2039 keV Q-value for 76Ge Neutrinoless double-beta decay. In this paper, we discuss the physics of neutrinoless double beta decay and then focus on the Majorana Demonstrator, including its design and approach to achieve ultra-low backgrounds and the status of the experiment., Comment: Published Version. 10 pages, 6 figures, proceedings for the 2nd Workshop on Germanium Detectors and Technologies, 14-17 September 2014, at the University of South Dakota, Vermillion, SD
Published: 2015
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27. MAJORANA Collaboration's Experience with Germanium Detectors

Author: A. Galindo-Uribarri, Yuen-Dat Chan, S. Vasilyev, Alan Poon, N. Abgrall, Anne-Marie Suriano, J. A. Detwiler, R. D. Martin, J. Gruszko, Yu. Efremenko, J. Goett, J. F. Wilkerson, R. G. H. Robertson, M. A. Howe, E. Romero-Romero, D. J. Tedeschi, C.M. O'Shaughnessy, B. R. White, Vladimir Yumatov, Stanley M. Howard, Jonathan D. Leon, V. B. Brudanin, I. S. Guinn, F. T. Avignone, R. L. Varner, B. R. Jasinski, M. P. Green, M. Buuck, C. Wiseman, Nicole R. Overman, Reyco Henning, Eric W. Hoppe, C. Cuesta, J. Rager, D. Byram, Matthew Busch, C.-H. Yu, H. Ejiri, A. S. Barabash, Susanne Mertens, K. J. Keeter, B. Shanks, V. E. Guiseppe, S. R. Elliott, Brian D. LaFerriere, D. C. Radford, A. S. Caldwell, Keith Rielage, M. Shirchenko, John L. Orrell, J. MacMullin, Kai Vetter, S. J. Meijer, C. D. Christofferson, F. E. Bertrand, K. Vorren, M. F. Kidd, E. Yakushev, W. Xu, G. K. Giovanetti, J. E. Trimble, Richard T. Kouzes, M. C. Ronquest, S. I. Konovalov, and N. Snyder
Subjects: Physics, History, Physics - Instrumentation and Detectors, Detector, chemistry.chemical_element, FOS: Physical sciences, Germanium, Instrumentation and Detectors (physics.ins-det), Engineering physics, Computer Science Applications, Education, Characterization (materials science), Point contact, MAJORANA, chemistry, Germanium crystal, Nuclear Experiment (nucl-ex), Nuclear Experiment
Abstract: The goal of the \textsc{Majorana} \textsc{Demonstrator} project is to search for 0$\nu\beta\beta$ decay in $^{76}\mathrm{Ge}$. Of all candidate isotopes for 0$\nu\beta\beta$, $^{76}\mathrm{Ge}$ has some of the most favorable characteristics. Germanium detectors are a well established technology, and in searches for 0$\nu\beta\beta$, the high purity germanium crystal acts simultaneously as source and detector. Furthermore, p-type germanium detectors provide excellent energy resolution and a specially designed point contact geometry allows for sensitive pulse shape discrimination. This paper will summarize the experiences the \textsc{Majorana} collaboration made with enriched germanium detectors manufactured by ORTEC$^{\circledR}$. The process from production, to characterization and integration in \textsc{Majorana} mounting structure will be described. A summary of the performance of all enriched germanium detectors will be given., Comment: 10 pages, 8 figures
Published: 2015
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28. Low background signal readout electronics for the MAJORANA DEMONSTRATOR

Author: I. J. Arnquist, N. Snyder, T. Gilliss, R. D. Martin, M. Shirchenko, John L. Orrell, R. G. H. Robertson, Eric W. Hoppe, J. MacMullin, C. D. Christofferson, Brian D. LaFerriere, F. T. Avignone, R. L. Varner, Reyco Henning, M. F. Kidd, C. X. Baldenegro-Barrera, D. J. Tedeschi, W. Xu, J. Goett, A. Galindo-Uribarri, B. Shanks, E. Romero-Romero, V. E. Guiseppe, C.-H. Yu, S. Vasilyev, D. C. Radford, C. Wiseman, N. Abgrall, C. Cuesta, Keith Rielage, M. Buuck, K. J. Keeter, J. E. Trimble, Yuen-Dat Chan, B. R. Jasinski, J. F. Wilkerson, V. B. Brudanin, F. E. Bertrand, A. W. Bradley, S. I. Konovalov, M. A. Howe, Alan Poon, Anne-Marie Suriano, J. A. Detwiler, B. R. White, C. O'Shaughnessy, Vladimir Yumatov, Stanley M. Howard, J. Rager, Yu. Efremenko, S. R. Elliott, Richard T. Kouzes, Kai Vetter, Jonathan D. Leon, A. S. Barabash, I. S. Guinn, J. Gruszko, D. Byram, S. Mertens, M. P. Green, H. Ejiri, I. Zhitnikov, Matthew Busch, K. Vorren, A. S. Caldwell, G. K. Giovanetti, S. J. Meijer, and E. Yakushev
Subjects: Physics, Physics - Instrumentation and Detectors, Detector, FOS: Physical sciences, Readout electronics, Instrumentation and Detectors (physics.ins-det), Signal, Semiconductor detector, Nuclear physics, MAJORANA, Double beta decay, Nuclear Experiment (nucl-ex), Hpge detector, Nuclear Experiment, Scale down
Abstract: The MAJORANA Collaboration will seek neutrinoless double beta decay (0nbb) in 76Ge using isotopically enriched p-type point contact (PPC) high purity Germanium (HPGe) detectors. A tonne-scale array of HPGe detectors would require background levels below 1 count/ROI-tonne-year in the 4 keV region of interest (ROI) around the 2039 keV Q-value of the decay. In order to demonstrate the feasibility of such an experiment, the MAJORANA DEMONSTRATOR, a 40 kg HPGe detector array, is being constructed with a background goal of, 6 pages, 7 figures, 2 tables. LRT 2015 Proceedings
Published: 2015
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29. A Dark Matter Search with MALBEK

Author: J. Gruszko, V. Egorov, M. Shirchenko, C.M. O'Shaughnessy, John L. Orrell, Albert Young, V. Yumatov, N. Snyder, R. D. Martin, J. F. Wilkerson, W. Xu, R. G. H. Robertson, P. Finnerty, J. MacMullin, Y-D. Chan, B. R. White, Anne-Marie Suriano, Nicole R. Overman, G. K. Giovanetti, Keith Rielage, A. Galindo-Uribarri, A. W. P. Poon, D. Byram, J. Rager, H. Ejiri, Steven Elliott, E. Romero-Romero, D. C. Combs, Stanley M. Howard, V. V. Timkin, D. G. Phillips, M. F. Kidd, K. J. Snavely, B. Shanks, M. C. Ronquest, V. E. Guiseppe, James E. Fast, V. Brudanin, O.I. Kochetov, C. Cuesta, S. Vasilyev, Yuri Efremenko, A. S. Caldwell, F. M. Fraenkle, S. I. Konovalov, A. L. Hallin, J. A. Detwiler, N. Abgrall, Jeffrey K. Thompson, K. N. Gusev, A. Hegai, M. A. Howe, Tatsushi Shima, D. C. Radford, M. P. Green, K. Pushkin, M. Busch, Richard T. Kouzes, F. T. Avignone, Chang-Hong Yu, Kai Vetter, C. D. Christofferson, Ryuta Hazama, F. E. Bertrand, Eric W. Hoppe, Masaharu Nomachi, J. E. Trimble, K. J. Keeter, P. J. Doe, L. E. Leviner, Jonathan D. Leon, E. Aguayo, J. Goett, Susanne Mertens, E. Yakushev, R. L. Varner, S. MacMullin, Reyco Henning, C. Wiseman, Alexis G. Schubert, M. Boswell, S. J. Meijer, K. Vorren, J. C. Loach, Brian D. LaFerriere, A. S. Barabash, and Werner Tornow
Subjects: Physics, Particle physics, Physics - Instrumentation and Detectors, majorana, Physics::Instrumentation and Detectors, Detector, Dark matter, Astrophysics::Instrumentation and Methods for Astrophysics, FOS: Physical sciences, Instrumentation and Detectors (physics.ins-det), Physics and Astronomy(all), germanium detector, neutrinoless double beta decay, High Energy Physics - Experiment, Semiconductor detector, MAJORANA, High Energy Physics - Experiment (hep-ex), WIMP, Double beta decay, Weakly interacting massive particles, High Energy Physics::Experiment, Nuclear Experiment (nucl-ex), Nuclear Experiment, Event (particle physics)
Abstract: The MAJORANA DEMONSTRATOR is an array of natural and enriched high purity germanium detectors that will search for the neutrinoless double-beta decay of 76-Ge and perform a search for weakly interacting massive particles (WIMPs) with masses below 10 GeV. As part of the MAJORANA research and development efforts, we have deployed a modified, low-background broad energy germanium detector at the Kimballton Underground Research Facility. With its sub-keV energy threshold, this detector is sensitive to potential non-Standard Model physics, including interactions with WIMPs. We discuss the backgrounds present in the WIMP region of interest and explore the impact of slow surface event contamination when searching for a WIMP signal., Comment: To appear in the Proceedings of the 13th International Conference on Topics in Astroparticle and Underground Physics, TAUP 2013 (F. Avignone & W. Haxton, editors, Physics Procedia, Elsevier)
Published: 2014
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30. Status of the Majorana Demonstrator experiment

Author: W. Xu, Yu. Efremenko, O.I. Kochetov, E. Romero-Romero, Yuen-Dat Chan, Matthew Busch, Eric W. Hoppe, Werner Tornow, D. G. Phillips, K. J. Snavely, J. Goett, Kai Vetter, R. D. Martin, James E. Fast, V. B. Brudanin, Alexis G. Schubert, Ryuta Hazama, A. Galindo-Uribarri, K. Pushkin, A. Hegai, A. S. Caldwell, Jeffrey K. Thompson, R. G. H. Robertson, C.M. O'Shaughnessy, J. Esterline, J. Gruszko, M. P. Green, M. A. Howe, K. N. Gusev, H. Ejiri, L. E. Leviner, M. Shirchenko, John L. Orrell, S. Vasilyev, F. T. Avignone, Keith Rielage, Nicole R. Overman, S. MacMullin, N. Snyder, R. L. Varner, Vladimir Yumatov, Stanley M. Howard, A. R. Young, J. F. Wilkerson, V. G. Egorov, Reyco Henning, F. M. Fraenkle, A. L. Hallin, N. Abgrall, E. Aguayo, C. D. Christofferson, P. Finnerty, B. Shanks, Richard T. Kouzes, J. MacMullin, V. E. Guiseppe, S. R. Elliott, B. R. White, Susanne Mertens, Alan Poon, P. J. Doe, L. Mizouni, Anne-Marie Suriano, J. A. Detwiler, C.-H. Yu, V. V. Timkin, A. Soin, F. E. Bertrand, Tatsushi Shima, D. C. Combs, M. Boswell, Masaharu Nomachi, D. C. Radford, Jonathan D. Leon, K. J. Keeter, G. K. Giovanetti, J. C. Loach, Brian D. LaFerriere, K. Vorren, A. S. Barabash, E. Yakushev, M. C. Ronquest, S. I. Konovalov, and M. F. Kidd
Subjects: Nuclear physics, Physics, MAJORANA, Particle physics, Double beta decay, Neutrino
Abstract: The Majorana Demonstrator neutrinoless double beta-decay experiment is currently under construction at the Sanford Underground Research Facility in South Dakota, USA. An overview and status of the experiment are given.
Published: 2014
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31. The Majorana Demonstrator: A search for neutrinoless double-beta decay of germanium-76

Author: S. R. Elliott, N. Abgrall, E. Aguayo, F. T. Avignone III, A. S. Barabash, F. E. Bertrand, M. Boswell, V. Brudanin, M. Busch, A. S. Caldwell, Y-D. Chan, C. D. Christofferson, D. C. Combs, J. A. Detwiler, P. J. Doe, Yu. Efremenko, V. Egorov, H. Ejiri, J. Esterline, J. E. Fast, P. Finnerty, F. M. Fraenkle, A. Galindo-Uribarri, G. K. Giovanetti, J. Goett, M. P. Green, J. Gruszko, V. E. Guiseppe, K. Gusev, A. L. Hallin, R. Hazama, A. Hegai, R. Henning, E. W. Hoppe, S. Howard, M. A. Howe, K. J. Keeter, M. F. Kidd, O. Kochetov, S. I. Konovalov, R. T. Kouzes, B. D. LaFerriere, J. Leon, L. E. Leviner, J. C. Loach, S. MacMullin, R. D. Martin, S. Mertens, L. Mizouni, M. Nomachi, J. L. Orrell, C. O'Shaughnessy, N. R. Overman, D. G. Phillips II, A. W. P. Poon, K. Pushkin, D. C. Radford, K. Rielage, R. G. H. Robertson, M. C. Ronquest, A. G. Schubert, B. Shanks, T. Shima, M. Shirchenko, K. J. Snavely, N. Snyder, A. Soin, J. Strain, A. M. Suriano, V. Timkin, W. Tornow, R. L. Varner, S. Vasilyev, K. Vetter, K. Vorren, B. R. White, J. F. Wilkerson, W. Xu, E. Yakushev, A. R. Young, C.-H. Yu, and V. Yumatov
Published: 2013
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32. The Majorana Demonstrator: A search for neutrinoless double-beta decay of germanium-76

Author: A.G. Schuberta, E. Aguayo, F.T. Avignone III, C. Zhang, H.O. Back, A.S. Barabash, M. Bergevin, F.E. Bertrand, M. Boswell, V. Brudanin, M. Busch, Y.D. Chan, C.D. Christofferson, J.I. Collar, D.C. Combs, R.J. Cooper, J.A. Detwiler, J. Leon, P.J. Doe, Yu. Efremenko, V. Egorov, H. Ejiri, S.R. Elliott, J. Esterline, J.E. Fast, N. Fields, P. Finnerty, F.M. Fraenkle, V.M. Gehman, G.K. Giovanetti, M.P. Green, V.E. Guiseppe, K. Gusey, A.L. Hallin, R. Hazama, R. Henning, A. Hime, E.W. Hoppe, M. Horton, S. Howard, M.A. A. Howe, R.A. Johnson, K.J. Keeter, M.E. Keillor, C. Keller, J.D. Kephart, M.F. Kidd, A. Knecht, O. Kochetov, S.I. Konovalov, R.T. Kouzes, B. LaFerriere, B.H. LaRoque, L.E. Leviner, J.C. Loach, S. MacMullin, M.G. Marino, R.D. Martin, D.-M. Mei, J. Merriman, M.L. Miller, L. Mizouni, M. Nomachi, J.L. Orrell, N. Overman, D.G. Phillips II, A.W.P. Poon, G. Perumpilly, G. Prior, D.C. Radford, K. Rielage, R.G.H. Robertson, M.C. Ronquest, T. Shima, M. Shirchenko, K.J. Snavely, V. Sobolev, D. Steele, J. Strain, K. Thomas, V. Timkin, W. Tornow, I. Vanyushin, R.L. Varner, K. Vetter, K. Vorren, J.F. Wilkerson, B.A. Wolfe, E. Yakushev, A.R. Young, C.-H. Yu, and V. Yumatov
Subjects: Physics, Particle physics, Bolometer, chemistry.chemical_element, Germanium, Lepton number, law.invention, Nuclear physics, MAJORANA, CUORE, chemistry, law, Double beta decay, Neutrino, Absolute scale
Abstract: The observation of neutrinoless double-beta decay would determine whether the neutrino is a Majorana particle and provide information on the absolute scale of neutrino mass. The Majorana Collaboration is constructing the Demonstrator, an array of germanium detectors, to search for neutrinoless double-beta decay of 76Ge. The Demonstrator will contain 40kg of germanium; up to 30kg will be enriched to 86% in 76Ge. The Demonstrator will be deployed deep underground in an ultra-low-background shielded environment. Operation of the Demonstrator aims to determine whether a future tonne-scale germanium experiment can achieve a background goal of one count per tonne-year in a 4-keV region of interest around the 76Ge neutrinoless double-beta decay Q-value of 2039 keV.
Published: 2012
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33. Measurement of airborne fission products in Chapel Hill, NC, USA from the Fukushima Dai-ichi reactor accident

Author: Rebecca M. Holmes, J. F. Wilkerson, M. P. Green, Reyco Henning, S. MacMullin, G. K. Giovanetti, and K. Vorren
Subjects: Radioactive Fallout, Time Factors, 010504 meteorology & atmospheric sciences, Fukushima Nuclear Accident, Health, Toxicology and Mutagenesis, FOS: Physical sciences, 010501 environmental sciences, 7. Clean energy, 01 natural sciences, Particle detector, law.invention, Japan, law, Radiation Monitoring, Nuclear power plant, North Carolina, Environmental Chemistry, Humans, Nuclear Experiment (nucl-ex), Waste Management and Disposal, Nuclear Experiment, 0105 earth and related environmental sciences, Air filter, Radioisotopes, Fission products, Radiochemistry, Radioactive waste, General Medicine, Pollution, Semiconductor detector, 13. Climate action, Air Pollutants, Radioactive, Nuclear Power Plants, Environmental science, Hpge detector, Radioactive Hazard Release
Abstract: We present measurements of airborne fission products in Chapel Hill, NC, USA, from 62 days following the March 11, 2011, accident at the Fukushima Dai-ichi nuclear power plant. Airborne particle samples were collected daily in air filters and radio-assayed with two high-purity germanium (HPGe) detectors. The fission products I-131 and Cs-137 were measured with maximum activities of 4.2 +/- 0.6 mBq/m^3 and 0.42 +/- 0.07 mBq/m^3 respectively. Additional activity from I-131, I-132, Cs-134, Cs-136, Cs-137 and Te-132 were measured in the same air filters using a low-background HPGe detector at the Kimballton Underground Research Facility (KURF)., 10 pages, 4 figures
Published: 2011

34. The MAJORANA DEMONSTRATOR: A Search for Neutrinoless Double-beta Decay of Germanium-76

Author: J. Esterline, Keith Rielage, M. L. Miller, A. W. P. Poon, R. D. Martin, V. G. Egorov, R. G. H. Robertson, Yu. Efremenko, Nicole R. Overman, D. G. Phillips, V. E. Guiseppe, L. Mizouni, M. C. Ronquest, A. Knecht, O.I. Kochetov, Keenan Thomas, V. B. Brudanin, G. K. Giovanetti, Tatsushi Shima, C.-H. Yu, B. H. LaRoque, J. C. Loach, James E. Fast, C. D. Christofferson, S. R. Elliott, V. V. Timkin, J. Strain, R. A. Johnson, G. Perumpilly, S. I. Konovalov, D. Steele, V. M. Gehman, K. Vorren, Yuen-Dat Chan, M. P. Green, M. Shirchenko, Dongming Mei, F. M. Fraenkle, Brian D. LaFerriere, M. F. Kidd, John L. Orrell, H. Ejiri, A. L. Hallin, Werner Tornow, I. Vanyushin, Matthew Busch, A. S. Barabash, Richard T. Kouzes, D. C. Radford, Masaharu Nomachi, Kai Vetter, K. Gusey, M. A. Howe, K. J. Snavely, J. R. Beene, F. E. Bertrand, Jonathan D. Leon, M. Boswell, Ryuta Hazama, M. Bergevin, G. Prior, E. Yakushev, Reynold J. Cooper, L. E. Leviner, N. Fields, Eric W. Hoppe, J. H. Merriman, Vladimir Yumatov, Stanley M. Howard, A. R. Young, Michael G. Marino, J. A. Detwiler, E. Aguayo, D. C. Combs, Chao Zhang, J. F. Wilkerson, P. Finnerty, S. MacMullin, Alexis G. Schubert, J. I. Collar, Henning O. Back, C. Keller, F. T. Avignone, R. L. Varner, Reyco Henning, P. J. Doe, M. Horton, and K. J. Keeter
Subjects: Physics, History, Particle physics, Physics::Instrumentation and Detectors, Detector, Dark matter, FOS: Physical sciences, chemistry.chemical_element, Germanium, Computer Science Applications, Education, MAJORANA, WIMP, chemistry, Double beta decay, High Energy Physics::Experiment, Nuclear Experiment (nucl-ex), Neutrino, Tonne, Nuclear Experiment
Abstract: The observation of neutrinoless double-beta decay would determine whether the neutrino is a Majorana particle and provide information on the absolute scale of neutrino mass. The MAJORANA Collaboration is constructing the DEMONSTRATOR, an array of germanium detectors, to search for neutrinoless double-beta decay of 76-Ge. The DEMONSTRATOR will contain 40 kg of germanium; up to 30 kg will be enriched to 86% in 76-Ge. The DEMONSTRATOR will be deployed deep underground in an ultra-low-background shielded environment. Operation of the DEMONSTRATOR aims to determine whether a future tonne-scale germanium experiment can achieve a background goal of one count per tonne-year in a 4-keV region of interest around the 76-Ge neutrinoless double-beta decay Q-value of 2039 keV., Submitted to AIP Conference Proceedings, 19th Particles & Nuclei International Conference (PANIC 2011), Massachusetts Institute of Technology, Cambridge, MA, USA, July 24-29, 2011; 3 pages, 1 figure
Published: 2011

35. The Majorana Experiment

Author: M. Shirchenko, D. C. Combs, J. H. Merriman, John L. Orrell, Albert Young, Eric W. Hoppe, V. Sobolev, Michael G. Marino, A. S. Barabash, V. G. Egorov, Martin E. Keillor, E. Yakushev, Jonathan D. Leon, B. H. LaRoque, K. Gusey, Yu. Efremenko, N. Fields, Matthew Busch, P. J. Doe, Alexis G. Schubert, G. Perumpilly, F. M. Fraenkle, M. C. Ronquest, V. M. Gehman, D. G. Phillips, James E. Fast, J. A. Detwiler, J. F. Wilkerson, M. P. Green, M. Horton, P. Finnerty, M. L. Miller, Masaharu Nomachi, B. A. Wolfe, Vladimir Yumatov, K. J. Keeter, J. I. Collar, Stanley M. Howard, H. Ejiri, A. W. P. Poon, Andrew Hime, S. MacMullin, Dongming Mei, S. I. Konovalov, R. D. Martin, Henning O. Back, C. D. Christofferson, Richard T. Kouzes, C. Keller, G. K. Giovanetti, Keith Rielage, R. A. Johnson, S. R. Elliott, R. G. H. Robertson, L. Mizouni, Kai Vetter, K. Vorren, Werner Tornow, D. C. Radford, F. E. Bertrand, C.-H. Yu, M. Boswell, Ryuta Hazama, Nicole R. Overman, L. E. Leviner, K. J. Snavely, V. V. Timkin, I. Vanyushin, Brian D. LaFerriere, G. Prior, Jeremy D. Kephart, J. Strain, V. E. Guiseppe, D. Steele, F. T. Avignone, E. Aguayo, Yuen-Dat Chan, R. L. Varner, Reyco Henning, A. Knecht, O.I. Kochetov, J. Esterline, Keenan Thomas, J. C. Loach, M. A. Howe, Chao Zhang, M. F. Kidd, M. Bergevin, Tatsushi Shima, A. L. Hallin, Reynold J. Cooper, and V. B. Brudanin
Subjects: Nuclear physics, Physics, Particle physics, MAJORANA, Double beta decay, Elementary particle, Invariant mass, Fermion, Neutrino, Radioactive decay, Lepton
Abstract: The Majorana collaboration is actively pursuing research and development aimed at a tonne-scale {sup 76}Ge neutrinoless double-beta decay ({beta}{beta}(0{nu})-decay) experiment. The current, primary focus is the construction of the Majorana Demonstrator experiment, an R and D effort that will field approximately 40 kg of germanium detectors with mixed enrichment levels. This article provides a status update on the construction of the Demonstrator.
Published: 2011
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36. The Majorana Experiment

Author: C.E. Aalseth, E. Aguayo, M. Amman, F.T. Avignone, H.O. Back, X. Bai, A.S. Barabash, P.S. Barbeau, M. Bergevin, F.E. Bertrand, M. Boswell, V. Brudanin, W. Bugg, T.H. Burritt, M. Busch, G. Capps, Y.-D. Chan, J.I. Collar, R.J. Cooper, R. Creswick, J.A. Detwiler, J. Diaz, P.J. Doe, Yu. Efremenko, V. Egorov, H. Ejiri, S.R. Elliott, J. Ely, J. Esterline, H. Farach, J.E. Fast, N. Fields, P. Finnerty, F.M. Fraenkle, V.M. Gehman, G.K. Giovanetti, M. Green, V.E. Guiseppe, K. Gusey, A.L. Hallin, G.C. Harper, R. Hazama, R. Henning, A. Hime, H. Hong, E.W. Hoppe, T.W. Hossbach, S. Howard, M.A. Howe, R.A. Johnson, K.J. Keeter, M. Keillor, C. Keller, J.D. Kephart, M.F. Kidd, A. Knecht, O. Kochetov, S.I. Konovalov, R.T. Kouzes, B.H. LaRoque, L. Leviner, J.C. Loach, P.N. Luke, S. MacMullin, M.G. Marino, R.D. Martin, D. Medlin, D.-M. Mei, H.S. Miley, M.L. Miller, L. Mizouni, A.W. Myers, M. Nomachi, J.L. Orrell, D. Peterson, D.G. Phillips, A.W.P. Poon, O. Perevozchikov, G. Perumpilly, G. Prior, D.C. Radford, D. Reid, K. Rielage, R.G.H. Robertson, L. Rodriguez, M.C. Ronquest, H. Salazar, A.G. Schubert, T. Shima, M. Shirchenko, V. Sobolev, D. Steele, J. Strain, G. Swift, K. Thomas, V. Timkin, W. Tornow, T.D. Van Wechel, I. Vanyushin, R.L. Varner, K. Vetter, K. Vorren, J.F. Wilkerson, B.A. Wolfe, W. Xiang, E. Yakushev, H. Yaver, A.R. Young, C.-H. Yu, V. Yumatov, and C. Zhang
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, 010308 nuclear & particles physics, FOS: Physical sciences, Construct (python library), 01 natural sciences, Atomic and Molecular Physics, and Optics, MAJORANA, 0103 physical sciences, Nuclear Experiment (nucl-ex), 010306 general physics, Hpge detector, Nuclear Experiment
Abstract: The Majorana Collaboration is assembling an array of HPGe detectors to search for neutrinoless double-beta decay in Ge-76. Initially, Majorana aims to construct a prototype module to demonstrate the potential of a future 1-tonne experiment. The design and potential reach of this prototype Demonstrator module are presented., Comment: Proceedings of NOW2010, Conca Specchiulla, Italy, September 4-11, 2010
Published: 2011
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37. Status of the MAJORANA DEMONSTRATOR: A search for neutrinoless double-beta decay

Author: J. MacMullin, B. R. Jasinski, J. Rager, J. F. Wilkerson, Kai Vetter, B. R. White, J. E. Trimble, I. S. Guinn, S. J. Meijer, C. X. Baldenegro-Barrera, A. W. Bradley, M. Buuck, C.M. O'Shaughnessy, C.-H. Yu, B. Shanks, V. E. Guiseppe, Brian D. LaFerriere, A. Galindo-Uribarri, M. Shirchenko, F. T. Avignone, J. Goett, S. Vasilyev, R. L. Varner, Reyco Henning, T. Gilliss, D. Tedeschi, John L. Orrell, N. Abgrall, A. S. Caldwell, Yuen-Dat Chan, Vladimir Yumatov, Richard T. Kouzes, R. D. Martin, D. Byram, M. P. Green, Susanne Mertens, Stanley M. Howard, C. Wiseman, Jonathan D. Leon, Yu. Efremenko, R. G. H. Robertson, E. Romero-Romero, A. S. Barabash, H. Ejiri, M. A. Howe, F. E. Bertrand, W. Xu, C. Cuesta, E. Yakushev, G. K. Giovanetti, A. W. P. Poon, Anne-Marie Suriano, J. A. Detwiler, Eric W. Hoppe, J. Gruszko, K. Vorren, C. D. Christofferson, K. J. Keeter, V.B. Brudanin, S. I. Konovalov, D. C. Radford, S. R. Elliott, I. Zhitnikov, Matthew Busch, Keith Rielage, M. F. Kidd, I. J. Arnquist, and N. Snyder
Subjects: Physics, Nuclear and High Energy Physics, Antiparticle, Particle physics, media_common.quotation_subject, High Energy Physics::Phenomenology, Astronomy and Astrophysics, Fermion, Lepton number, Asymmetry, Atomic and Molecular Physics, and Optics, Nuclear physics, MAJORANA, Double beta decay, High Energy Physics::Experiment, Neutron, Neutrino, media_common
Abstract: If neutrinos are Majorana particles, i.e. fermions that are their own antiparticles, then neutrinoless double-beta (0νββ) decay is possible. In such a process, two neutrons can simultaneously decay into two protons and two electrons without emitting neutrinos. Neutrinos being Majorana particles would explicitly violate lepton number conservation, and might play a role in the matter–antimatter asymmetry in the universe. The MAJORANA DEMONSTRATOR experiment is under construction at the Sanford Underground Research Facility in Lead, SD and will search for the neutrinoless double-beta (0νββ) decay of the 76Ge isotope. The goal of the experiment is to demonstrate that it is possible to achieve a sufficiently low background rate in the 4 keV region of interest (ROI) around the 2039 keV Q-value to justify building a tonne-scale experiment. In this paper, we discuss the physics and design of the MAJORANA DEMONSTRATOR, its approach to achieving ultra-low background and the status of the experiment.
Published: 2015
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38. The Majorana Demonstrator: Progress towards showing the feasibility of a tonne–scale76Ge neutrinoless double–beta decay experiment

Author: Nicole R. Overman, F. T. Avignone, R. L. Varner, L. Mizouni, V. G. Egorov, Kai Vetter, Ryuta Hazama, Yuen-Dat Chan, Alexis G. Schubert, D. C. Radford, J. Esterline, A. S. Barabash, M. F. Kidd, Reynold J. Cooper, V. E. Guiseppe, Richard T. Kouzes, J. H. Merriman, C. D. Christofferson, A. Galindo-Uribarri, Michael G. Marino, M. C. Ronquest, Paul N. Luke, Matthew Busch, K. Gusey, H. Yaver, K. J. Snavely, J. F. Wilkerson, F. M. Fraenkle, A. L. Hallin, M. A. Howe, S. I. Konovalov, Masaharu Nomachi, P. Finnerty, Jonathan D. Leon, P. J. Doe, M. L. Miller, J. I. Collar, Tatsushi Shima, K. Vorren, J. Strain, L. E. Leviner, Vladimir Yumatov, Brian D. LaFerriere, Stanley M. Howard, A. R. Young, Alan Poon, M. Horton, D. Steele, R. D. Martin, A. Knecht, J. A. Detwiler, S. R. Elliott, C.-H. Yu, O.I. Kochetov, K. J. Keeter, J. C. Loach, V. V. Timkin, R. G. H. Robertson, D. C. Combs, J. R. Beene, F. E. Bertrand, S. MacMullin, V. B. Brudanin, M. Boswell, E. Aguayo, Eric W. Hoppe, Paul Barton, E. Yakushev, G. Perumpilly, R. Henning, V. M. Gehman, N. Fields, Werner Tornow, M. P. Green, H. Ejiri, Mark Amman, R. A. Johnson, G. K. Giovanetti, M. Shirchenko, John L. Orrell, Yu. Efremenko, D. G. Phillips, James E. Fast, and Keith Rielage
Subjects: Physics, History, Particle physics, Detector, chemistry.chemical_element, Germanium, Lepton number, Computer Science Applications, Education, Semiconductor detector, Nuclear physics, MAJORANA, chemistry, Double beta decay, Electromagnetic shielding, Neutrino
Abstract: The Majorana Demonstrator will search for the neutrinoless double–beta decay (0vββ) of the 76Ge isotope with a mixed array of enriched and natural germanium detectors. The observation of this rare decay would indicate the neutrino is its own anti–particle, demonstrate that lepton number is not conserved, and provide information on the absolute mass–scale of the neutrino. The Demonstrator is being assembled at the 4850 foot level of the Sanford Underground Research Facility in Lead, South Dakota. The array will be contained in a low–background environment and surrounded by passive and active shielding. The goals for the Demonstrator are: demonstrating a background rate less than 3 t−1 y−1 in the 4 keV region of interest (ROI) surrounding the 2039 keV 76Ge endpoint energy; establishing the technology required to build a tonne–scale germanium based double–beta decay experiment; testing the recent claim of observation of 0vββ [1]; and performing a direct search for light WIMPs (3-10 GeV/c2).
Published: 2014
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39. The MAJORANA experiment: an ultra-low background search for neutrinoless double-beta decay

Author: B. H. LaRoque, K. Vorren, Yuen-Dat Chan, Chao Zhang, G. Perumpilly, A. L. Hallin, F. T. Avignone, R. L. Varner, I. Vanyushin, D. G. Phillips, L. Mizouni, V. M. Gehman, Reyco Henning, D. C. Combs, G. Prior, James E. Fast, A. S. Barabash, Nicole R. Overman, Andrew Hime, S. MacMullin, J. H. Merriman, K. Gusey, Dongming Mei, J. I. Collar, J. F. Wilkerson, Michael G. Marino, C. D. Christofferson, J. Esterline, Alexis G. Schubert, A. Knecht, Keenan Thomas, J. A. Detwiler, M. F. Kidd, Henning O. Back, P. Finnerty, C. Keller, B. A. Wolfe, M. Shirchenko, V. E. Guiseppe, John L. Orrell, M. A. Howe, P. J. Doe, G. K. Giovanetti, M. P. Green, O.I. Kochetov, Reynold J. Cooper, K. J. Snavely, L. E. Leviner, J. C. Loach, M. Horton, M. C. Ronquest, M. L. Miller, H. Ejiri, K. J. Keeter, Keith Rielage, J. Strain, S. R. Elliott, R. A. Johnson, F. E. Bertrand, D. Steele, E. Aguayo, R. D. Martin, V. Efremenko, Jonathan D. Leon, M. Boswell, M. Bergevin, Masaharu Nomachi, S. I. Konovalov, Richard T. Kouzes, Kai Vetter, Eric W. Hoppe, C.-H. Yu, Ryuta Hazama, A. W. P. Poon, R. G. H. Robertson, Brian D. LaFerriere, V. V. Timkin, E. Yakushev, N. Fields, Werner Tornow, V. G. Egorov, Matthew Busch, V. B. Brudanin, D. C. Radford, F. M. Fraenkle, Vladimir Yumatov, Stanley M. Howard, A. R. Young, and Tatsushi Shima
Subjects: Physics, History, Particle physics, Physics - Instrumentation and Detectors, Isotopes of germanium, FOS: Physical sciences, Instrumentation and Detectors (physics.ins-det), Computer Science Applications, Education, MAJORANA, Double beta decay, Invariant mass, Nuclear Experiment (nucl-ex), Neutrino, Nuclear Experiment, Absolute scale, Radioactive decay, Lepton
Abstract: The observation of neutrinoless double-beta decay would resolve the Majorana nature of the neutrino and could provide information on the absolute scale of the neutrino mass. The initial phase of the Majorana experiment, known as the Demonstrator, will house 40 kg of Ge in an ultra-low background shielded environment at the 4850' level of the Sanford Underground Laboratory in Lead, SD. The objective of the Demonstrator is to determine whether a future 1-tonne experiment can achieve a background goal of one count per tonne-year in a narrow region of interest around the 76Ge neutrinoless double-beta decay peak., Comment: Presentation for the Rutherford Centennial Conference on Nuclear Physics
Published: 2012
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40. Dark matter sensitivities of the Majorana Demonstrator

Author: Alan Poon, B. H. LaRoque, Masaharu Nomachi, J. A. Detwiler, Eric W. Hoppe, O.I. Kochetov, G. Perumpilly, V. M. Gehman, Brian D. LaFerriere, J. C. Loach, J. Esterline, M. F. Kidd, Vladimir Yumatov, C.-H. Yu, V. B. Brudanin, Kai Vetter, Dongming Mei, V. V. Timkin, Stanley M. Howard, A. R. Young, S. R. Elliott, Ryuta Hazama, Tatsushi Shima, Nicole R. Overman, M. Shirchenko, John L. Orrell, M. Bergevin, M. P. Green, G. Prior, A. S. Barabash, J. F. Wilkerson, Keith Rielage, J. H. Merriman, S. MacMullin, V. G. Egorov, Yuen-Dat Chan, Matthew Busch, Michael G. Marino, K. Gusey, Alexis G. Schubert, J. R. Beene, F. E. Bertrand, C. D. Christofferson, A. L. Hallin, V. E. Guiseppe, P. Finnerty, Chao Zhang, H. Ejiri, M. Boswell, Reynold J. Cooper, J. Strain, M. L. Miller, D. Steele, K. Vorren, J. I. Collar, P. J. Doe, A. Knecht, Keenan Thomas, Yu. Efremenko, R. D. Martin, Henning O. Back, E. Yakushev, M. A. Howe, D. C. Radford, L. E. Leviner, C. Keller, D. G. Phillips, R. G. H. Robertson, K. J. Snavely, N. Fields, Richard T. Kouzes, M. Horton, M. C. Ronquest, L. Mizouni, E. Aguayo, James E. Fast, K. J. Keeter, G. K. Giovanetti, F. M. Fraenkle, R. A. Johnson, S. I. Konovalov, Werner Tornow, I. Vanyushin, F. T. Avignone, R. L. Varner, Reyco Henning, D. C. Combs, and Jonathan D. Leon
Subjects: Physics, History, Particle physics, Physics::Instrumentation and Detectors, Dark matter, Detector, Computer Science Applications, Education, Semiconductor detector, Nuclear physics, MAJORANA, WIMP, Weakly interacting massive particles, Data analysis, High Energy Physics::Experiment, Nuclear Experiment, Event (particle physics)
Abstract: The Majorana Demonstrator is an array of natural and enriched high purity germanium detectors that will search for the neutrinoless double-beta decay of Germanium-76 and perform a search for weakly interacting massive particles with masses below 10 GeV. To reach the background rate goal in the neutrinoless double-beta decay region of interest of 4 counts/keV/t/y, the DEMONSTRATOR will utilize a number of background reduction strategies, including a time-correlated event cut for 68Ge that requires a sub-keV energy threshold. This low energy threshold allows the DEMONSTRATOR to extend its physics reach to include a search for light WIMPs. We will discuss the detector systems and data analysis techniques required to achieve sub-keV thresholds as well as present the projected dark matter sensitivities of the Majorana Demonstrator.
Published: 2012
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41. The MAJORANA DEMONSTRATOR for 0νββ: Current Status and Future Plans

Author: Yuen-Dat Chan, S. J. Meijer, M. Shirchenko, John L. Orrell, O.I. Kochetov, A. Hegai, Eric W. Hoppe, R. D. Martin, M. A. Howe, A. S. Barabash, J. MacMullin, R. G. H. Robertson, N. Snyder, J. Gruszko, G. K. Giovanetti, Tatsushi Shima, J. C. Loach, Yu. Efremenko, E. Romero-Romero, Jonathan D. Leon, C.M. O'Shaughnessy, K. Pushkin, Matthew Busch, D. G. Phillips, Brian D. LaFerriere, Keith Rielage, J. F. Wilkerson, C.-H. Yu, James E. Fast, Nicole R. Overman, P. Finnerty, V. V. Timkin, Susanne Mertens, C. Cuesta, A. S. Caldwell, B. R. White, D. Byram, S. MacMullin, C. Wiseman, J. Rager, M. C. Ronquest, Jeffrey K. Thompson, Richard T. Kouzes, Alexis G. Schubert, B. Shanks, V. E. Guiseppe, D. C. Combs, D. C. Radford, W. Xu, K. J. Snavely, S. I. Konovalov, K. N. Gusev, E. Yakushev, K. Vorren, F. M. Fraenkle, C. D. Christofferson, Vladimir Yumatov, F. E. Bertrand, Stanley M. Howard, A. R. Young, S. R. Elliott, M. F. Kidd, Werner Tornow, M. Boswell, Kai Vetter, Ryuta Hazama, Masaharu Nomachi, J. E. Trimble, V. G. Egorov, Alan Poon, Anne-Marie Suriano, J. A. Detwiler, A. Galindo-Uribarri, P. J. Doe, K. J. Keeter, V.B. Brudanin, F. T. Avignone, R. L. Varner, Reyco Henning, S. Vasilyev, A. L. Hallin, N. Abgrall, L. E. Leviner, M. P. Green, E. Aguayo, H. Ejiri, and J. Goett
Subjects: Physics, business.industry, majorana, Physics and Astronomy(all), Modular design, germanium detector, neutrinoless double beta decay, Semiconductor detector, Nuclear physics, MAJORANA, Region of interest, Double beta decay, Systems engineering, business
Abstract: The MAJORANA DEMONSTRATOR will search for neutrinoless-double-beta decay (0νββ) in 76Ge, while establishing the feasibility of a future tonne-scale germanium-based 0νββ experiment, and performing searches for new physics beyond the Standard Model. The experiment, currently under construction at the Sanford Underground Research Facility in Lead, SD, will consist of a pair of modular high-purity germanium detector arrays housed inside of a compact copper, lead, and polyethylene shield. Through a combination of strict materials qualifications and assay, low-background design, and powerful background rejection techniques, the Demonstrator aims to achieve a background rate in the 0νββ region of interest (ROI) of no more than 3 counts in the 0νββ-decay ROI per tonne of target isotope per year (cnts/(ROI-t-y)). The current status of the Demonstrator is discussed, as are plans for its completion.
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42. Status update of the majorana demonstrator neutrinoless double beta decay experiment

Author: I. S. Guinn, J. F. Wilkerson, Howe, B. R. White, I. Zhitnikov, T. Gilliss, A. S. Barabash, Brian D. LaFerriere, Matthew Busch, R. D. Martin, Yu. Efremenko, J. Rager, D. Byram, G. K. Giovanetti, S. R. Elliott, A. S. Caldwell, W. Xu, R. G. H. Robertson, J. MacMullin, Y-D. Chan, K. Vorren, Richard T. Kouzes, J. Gruszko, E. Romero-Romero, B. Shanks, V. E. Guiseppe, Keith Rielage, S. I. Konovalov, K. J. Keeter, J. Goett, Jonathan D. Leon, Alan Poon, Anne-Marie Suriano, J. A. Detwiler, C. Cuesta, Kai Vetter, F. T. Avignone, Susanne Mertens, R. L. Varner, E. Yakushev, M. Buuck, B. R. Jasinski, M. Shirchenko, Reyco Henning, John L. Orrell, M. P. Green, S. J. Meijer, D. J. Tedeschi, H. Ejiri, A. W. Bradley, Ralph Massarczyk, A. Galindo-Uribarri, C. Wiseman, S. Vasilyev, N. Abgrall, C. Dunagan, I. J. Arnquist, N. Snyder, J. E. Trimble, Pinghan Chu, V. B. Brudanin, M. F. Kidd, C. D. Christofferson, F. E. Bertrand, Eric W. Hoppe, C.-H. Yu, C. O'Shaughnessy, Vladimir Yumatov, Stanley M. Howard, and D. C. Radford
Subjects: Physics, Particle physics, Physics - Instrumentation and Detectors, Dirac (video compression format), FOS: Physical sciences, Instrumentation and Detectors (physics.ins-det), nucl-ex, 7. Clean energy, Semiconductor detector, Nuclear physics, MAJORANA, Double beta decay, Leptogenesis, Grand Unified Theory, Nuclear Experiment (nucl-ex), Neutrino, Neutrino oscillation, Nuclear Experiment, physics.ins-det
Abstract: Neutrinoless double beta decay searches play a major role in determining neutrino properties, in particular the Majorana or Dirac nature of the neutrino and the absolute scale of the neutrino mass. The consequences of these searches go beyond neutrino physics, with implications for Grand Unification and leptogenesis. The \textsc{Majorana} Collaboration is assembling a low-background array of high purity Germanium (HPGe) detectors to search for neutrinoless double-beta decay in $^{76}$Ge. The \textsc{Majorana Demonstrator}, which is currently being constructed and commissioned at the Sanford Underground Research Facility in Lead, South Dakota, will contain 44 kg (30 kg enriched in $^{76}$Ge) of HPGe detectors. Its primary goal is to demonstrate the scalability and background required for a tonne-scale Ge experiment. This is accomplished via a modular design and projected background of less than 3 cnts/tonne-yr in the region of interest. The experiment is currently taking data with the first of its enriched detectors., Presentation at the DPF 2015 Meeting of the American Physical Society Division of Particles and Fields, Ann Arbor, Michigan, August 4-8, 2015. 6 pages. 5 figures

43. First Limit on the Direct Detection of Lightly Ionizing Particles for Electric Charge as Low as e/1000 with the Majorana Demonstrator.

Author: Alvis SI, Arnquist IJ, Avignone FT, Barabash AS, Barton CJ, Bertrand FE, Brudanin V, Busch M, Buuck M, Caldwell TS, Chan YD, Christofferson CD, Chu PH, Cuesta C, Detwiler JA, Dunagan C, Efremenko Y, Ejiri H, Elliott SR, Gilliss T, Giovanetti GK, Green MP, Gruszko J, Guinn IS, Guiseppe VE, Haufe CR, Hehn L, Henning R, Hoppe EW, Howe MA, Konovalov SI, Kouzes RT, Lopez AM, Martin RD, Massarczyk R, Meijer SJ, Mertens S, Myslik J, O'Shaughnessy C, Othman G, Pettus W, Poon AWP, Radford DC, Rager J, Reine AL, Rielage K, Robertson RGH, Ruof NW, Shanks B, Shirchenko M, Suriano AM, Tedeschi D, Varner RL, Vasilyev S, Vorren K, White BR, Wilkerson JF, Wiseman C, Xu W, Yakushev E, Yu CH, Yumatov V, Zhitnikov I, and Zhu BX
Abstract: The Majorana Demonstrator is an ultralow-background experiment searching for neutrinoless double-beta decay in ^{76}Ge. The heavily shielded array of germanium detectors, placed nearly a mile underground at the Sanford Underground Research Facility in Lead, South Dakota, also allows searches for new exotic physics. Free, relativistic, lightly ionizing particles with an electrical charge less than e are forbidden by the standard model but predicted by some of its extensions. If such particles exist, they might be detected in the Majorana Demonstrator by searching for multiple-detector events with individual-detector energy depositions down to 1 keV. This search is background-free, and no candidate events have been found in 285 days of data taking. New direct-detection limits are set for the flux of lightly ionizing particles for charges as low as e/1000.
Published: 2018
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44. Search for Neutrinoless Double-β Decay in ^{76}Ge with the Majorana Demonstrator.

Author: Aalseth CE, Abgrall N, Aguayo E, Alvis SI, Amman M, Arnquist IJ, Avignone FT, Back HO, Barabash AS, Barbeau PS, Barton CJ, Barton PJ, Bertrand FE, Bode T, Bos B, Boswell M, Bradley AW, Brodzinski RL, Brudanin V, Busch M, Buuck M, Caldwell AS, Caldwell TS, Chan YD, Christofferson CD, Chu PH, Collar JI, Combs DC, Cooper RJ, Cuesta C, Detwiler JA, Doe PJ, Dunmore JA, Efremenko Y, Ejiri H, Elliott SR, Fast JE, Finnerty P, Fraenkle FM, Fu Z, Fujikawa BK, Fuller E, Galindo-Uribarri A, Gehman VM, Gilliss T, Giovanetti GK, Goett J, Green MP, Gruszko J, Guinn IS, Guiseppe VE, Hallin AL, Haufe CR, Hehn L, Henning R, Hoppe EW, Hossbach TW, Howe MA, Jasinski BR, Johnson RA, Keeter KJ, Kephart JD, Kidd MF, Knecht A, Konovalov SI, Kouzes RT, LaFerriere BD, Leon J, Lesko KT, Leviner LE, Loach JC, Lopez AM, Luke PN, MacMullin J, MacMullin S, Marino MG, Martin RD, Massarczyk R, McDonald AB, Mei DM, Meijer SJ, Merriman JH, Mertens S, Miley HS, Miller ML, Myslik J, Orrell JL, O'Shaughnessy C, Othman G, Overman NR, Perumpilly G, Pettus W, Phillips DG, Poon AWP, Pushkin K, Radford DC, Rager J, Reeves JH, Reine AL, Rielage K, Robertson RGH, Ronquest MC, Ruof NW, Schubert AG, Shanks B, Shirchenko M, Snavely KJ, Snyder N, Steele D, Suriano AM, Tedeschi D, Tornow W, Trimble JE, Varner RL, Vasilyev S, Vetter K, Vorren K, White BR, Wilkerson JF, Wiseman C, Xu W, Yakushev E, Yaver H, Young AR, Yu CH, Yumatov V, Zhitnikov I, Zhu BX, and Zimmermann S
Abstract: The Majorana Collaboration is operating an array of high purity Ge detectors to search for neutrinoless double-β decay in ^{76}Ge. The Majorana Demonstrator comprises 44.1 kg of Ge detectors (29.7 kg enriched in ^{76}Ge) split between two modules contained in a low background shield at the Sanford Underground Research Facility in Lead, South Dakota. Here we present results from data taken during construction, commissioning, and the start of full operations. We achieve unprecedented energy resolution of 2.5 keV FWHM at Q_{ββ} and a very low background with no observed candidate events in 9.95 kg yr of enriched Ge exposure, resulting in a lower limit on the half-life of 1.9×10^{25} yr (90% C.L.). This result constrains the effective Majorana neutrino mass to below 240-520 meV, depending on the matrix elements used. In our experimental configuration with the lowest background, the background is 4.0_{-2.5}^{+3.1} counts/(FWHM t yr).
Published: 2018
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45. New Limits on Bosonic Dark Matter, Solar Axions, Pauli Exclusion Principle Violation, and Electron Decay from the Majorana Demonstrator.

Author: Abgrall N, Arnquist IJ, Avignone FT, Barabash AS, Bertrand FE, Bradley AW, Brudanin V, Busch M, Buuck M, Caldwell TS, Chan YD, Christofferson CD, Chu PH, Cuesta C, Detwiler JA, Dunagan C, Efremenko Y, Ejiri H, Elliott SR, Gilliss T, Giovanetti GK, Goett J, Green MP, Gruszko J, Guinn IS, Guiseppe VE, Haufe CRS, Henning R, Hoppe EW, Howard S, Howe MA, Jasinski BR, Keeter KJ, Kidd MF, Konovalov SI, Kouzes RT, Lopez AM, MacMullin J, Martin RD, Massarczyk R, Meijer SJ, Mertens S, O'Shaughnessy C, Poon AWP, Radford DC, Rager J, Reine AL, Rielage K, Robertson RGH, Shanks B, Shirchenko M, Suriano AM, Tedeschi D, Trimble JE, Varner RL, Vasilyev S, Vetter K, Vorren K, White BR, Wilkerson JF, Wiseman C, Xu W, Yakushev E, Yu CH, Yumatov V, Zhitnikov I, and Zhu BX
Abstract: We present new limits on exotic keV-scale physics based on 478 kg d of Majorana Demonstrator commissioning data. Constraints at the 90% confidence level are derived on bosonic dark matter (DM) and solar axion couplings, Pauli exclusion principle violating (PEPV) decay, and electron decay using monoenergetic peak signal limits above our background. Our most stringent DM constraints are set for 11.8 keV mass particles, limiting g_{Ae}<4.5×10^{-13} for pseudoscalars and (α^{'}/α)<9.7×10^{-28} for vectors. We also report a 14.4 keV solar axion coupling limit of g_{AN}^{eff}×g_{Ae}<3.8×10^{-17}, a 1/2β^{2}<8.5×10^{-48} limit on the strength of PEPV electron transitions, and a lower limit on the electron lifetime of τ_{e}>1.2×10^{24} yr for e^{-}→ invisible.
Published: 2017
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46. Measurement of airborne fission products in Chapel Hill, NC, USA from the Fukushima Dai-ichi reactor accident.

Author: MacMullin S, Giovanetti GK, Green MP, Henning R, Holmes R, Vorren K, and Wilkerson JF
Subjects: Humans, Japan, North Carolina, Radiation Monitoring, Time Factors, Air Pollutants, Radioactive analysis, Nuclear Power Plants, Radioactive Fallout analysis, Radioactive Hazard Release, Radioisotopes analysis
Abstract: We present measurement results of airborne fission products in Chapel Hill, NC, USA, from 62 d following the March 11, 2011, accident at the Fukushima Dai-ichi nuclear power plant. Airborne particle samples were collected daily in air filters and radio-assayed with two high-purity germanium (HPGe) detectors. The fission products (131)I and (137)Cs were measured with maximum activity concentrations of 4.2 ± 0.6 mBq/m(3) and 0.42 ± 0.07 mBq/m(3) respectively. Additional activity from (131,132)I, (134,136,137)Cs and (132)Te were measured in the same air filters using a low-background HPGe detector at the Kimballton Underground Research Facility (KURF)., (Copyright © 2012 Elsevier Ltd. All rights reserved.)
Published: 2012
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