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1. 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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2. 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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3. 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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4. 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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5. 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

6. 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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7. 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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8. 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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9. 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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10. 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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11. Status of the MAJORANA DEMONSTRATOR

Author

B. R. Jasinski, Anne-Marie Suriano, K. J. Keeter, M. A. Howe, D. Tedeschi, A. W. Bradley, F. E. Bertrand, C. Wiseman, G. K. Giovanetti, T. Gilliss, Ralph Massarczyk, A. Galindo-Uribarri, J. E. Trimble, Pinghan Chu, C. X. Baldenegro-Barrera, R. D. Martin, Susanne Mertens, J. MacMullin, E. Romero-Romero, E. Yakushev, R. G. H. Robertson, D. C. Radford, I. Zhitnikov, J. F. Wilkerson, Keith Rielage, S. Vasilyev, J. Gruszko, I. J. Arnquist, N. Snyder, Brian D. LaFerriere, N. Abgrall, W. Xu, B. R. White, C. Cuesta, Eric W. Hoppe, S. J. Meijer, A. W. P. Poon, D. Byram, J. A. Detwiler, A. S. Caldwell, J. Rager, Stanley M. Howard, M. Shirchenko, H. Ejiri, Y-D. Chan, Steven Elliott, V. Yumatov, Yu. Efremenko, John L. Orrell, B. Shanks, V. E. Guiseppe, Jonathan D. Leon, M. Busch, Richard T. Kouzes, K. Vorren, M. Buuck, M. P. Green, Kai Vetter, C. D. Christofferson, M. F. Kidd, S. I. Konovalov, R. L. Varner, Chang-Hong Yu, I. S. Guinn, F. T. Avignone, Reyco Henning, V.B. Brudanin, C. O'Shaughnessy, J. Goett, and A. S. Barabash

Subjects
Physics, Particle physics, Physics - Instrumentation and Detectors, business.industry, Detector, FOS: Physical sciences, Instrumentation and Detectors (physics.ins-det), Modular design, MAJORANA, Double beta decay, Mass scale, Neutrino, Nuclear Experiment (nucl-ex), Hpge detector, business, Nuclear Experiment
Abstract

The MAJORANA Collaboration is constructing the MAJORANA DEMONSTRATOR, an ultra-low background, modular, HPGe detector array with a mass of 44-kg (29 kg 76Ge and 15 kg natGe) to search for neutrinoless double beta decay in Ge-76. The next generation of tonne-scale Ge-based neutrinoless double beta decay searches will probe the neutrino mass scale in the inverted-hierarchy region. The MAJORANA DEMONSTRATOR is envisioned to demonstrate a path forward to achieve a background rate at or below 1 count/tonne/year in the 4 keV region of interest around the Q-value of 2039 keV. The MAJORANA DEMONSTRATOR follows a modular implementation to be easily scalable to the next generation experiment. First, the prototype module was assembled; it has been continuously taking data from July 2014 to June 2015. Second, Module 1 with more than half of the total enriched detectors and some natural detectors has been assembled and it is being commissioned. Finally, the assembly of Module 2, which will complete MAJORANA DEMONSTRATOR, is already in progress., Comment: 4 pages, 3 figures

Published
2015
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12. 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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13. 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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14. 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

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