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1. Search for Zero-Neutrino Double Beta Decay in 76Ge with the Majorana Demonstrator

Author

Aalseth, C. E., Abgrall, N., Aguayo, E., Alvis, S. I., Amman, M., Arnquist, I. J., Avignone III, F. T., Back, H. O., Barabash, A. S., Barbeau, P. S., Barton, C. J., Barton, P. J., Bertrand, F. E., Bode, T., Bos, B., Boswell, M., Brodzinski, R. L., Bradley, A. W., Brudanin, V., Busch, M., Buuck, M., Caldwell, A. S., Caldwell, T. S., Chan, Y-D., Christofferson, C. D., Chu, P. -H., Collar, J. I., Combs, D. C., Cooper, R. J., Cuesta, C., Detwiler, J. A., Doe, P. J., Dunmore, J. A., Efremenko, Yu., Ejiri, H., Elliott, S. R., Fast, J. E., Finnerty, P., Fraenkle, F. M., Fu, Z., Fujikawa, B. K., Fuller, E., Galindo-Uribarri, A., Gehman, V. M., Gilliss, T., Giovanetti, G. K., Goett, J., Green, M. P., Gruszko, J., Guinn, I. S., Guiseppe, V. E., Hallin, A. L., Haufe, C. R., Hehn, L., Henning, R., Hoppe, E. W., Hossbach, T. W., Howe, M. A., Jasinski, B. R., Johnson, R. A., Keeter, K. J., Kephart, J. D., Kidd, M. F., Knecht, A., Konovalov, S. I., Kouzes, R. T., Lesko, K. T., LaFerriere, B. D., Leon, J., Leviner, L. E., Loach, J. C., Lopez, A. M., Luke, P. N., MacMullin, J., MacMullin, S., Marino, M. G., Martin, R. D., Massarczyk, R., McDonald, A. B., Mei, D. -M., Meijer, S. J., Merriman, J. H., Mertens, S., Miley, H. S., Miller, M. L., Myslik, J., Orrell, J. L., O'Shaughnessy, C., Othman, G., Overman, N. R., Pettus, W., Phillips II, D. G., Poon, A. W. P., Perumpilly, G., Pushkin, K., Radford, D. C., Rager, J., Reeves, J. H., Reine, A. L., Rielage, K., Robertson, R. G. H., Ronquest, M. C., Ruof, N. W., Schubert, A. G., Shanks, B., Shirchenko, M., Snavely, K. J., Snyder, N., Steele, D., Suriano, A. M., Tedeschi, D., Tornow, W., Trimble, J. E., Varner, R. L., Vasilyev, S., Vetter, K., Vorren, K., White, B. R., Wilkerson, J. F., Wiseman, C., Xu, W., Yakushev, E., Yaver, H., Young, A. R., Yu, C. -H., Yumatov, V., Zhitnikov, I., Zhu, B. X., and Zimmermann, S.

Subjects
Nuclear Experiment, Physics - Instrumentation and Detectors
Abstract

The \MJ\ Collaboration is operating an array of high purity Ge detectors to search for neutrinoless double-beta decay in $^{76}$Ge. The \MJ\ \DEM\ 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 \qval\ and a very low background with no observed candidate events in 10 kg yr of enriched Ge exposure, resulting in a lower limit on the half-life of $1.9\times10^{25}$ yr (90\% CL). This result constrains the effective Majorana neutrino mass to below 240 to 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)., Comment: typos fixed

Published
2017
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2. The Majorana Parts Tracking Database

Author

The Majorana Collaboration, Abgrall, N., Aguayo, E., Avignone III, F. T., Barabash, A. S., Bertrand, F. E., Brudanin, V., Busch, M., Byram, D., Caldwell, A. S., Chan, Y-D., Christofferson, C. D., Combs, D. C., Cuesta, C., Detwiler, J. A., Doe, P. J., Efremenko, Yu., Egorov, V., Ejiri, H., Elliott, S. R., Esterline, J., Fast, J. E., Finnerty, P., Fraenkle, F. M., Galindo-Uribarri, A., Giovanetti, G. K., Goett, J., Green, M. P., Gruszko, J., Guiseppe, V. E., Gusev, K., Hallin, A. L., Hazama, R., Hegai, A., Henning, R., Hoppe, E. W., Howard, S., Howe, M. A., Keeter, K. J., Kidd, M. F., Kochetov, O., Konovalov, S. I., Kouzes, R. T., LaFerriere, B. D., Leon, J. Diaz, Leviner, L. E., Loach, J. C., MacMullin, J., Martin, R. D., Meijer, S. J., Mertens, S., Miller, M. L., Mizouni, L., Nomachi, M., Orrell, J. L., O'Shaughnessy, C., Overman, N. R., Petersburg, R., Phillips II, D. G., Poon, A. W. P., Pushkin, K., Radford, D. C., Rager, J., Rielage, K., Robertson, R. G. H., Romero-Romero, E., Ronquest, M. C., Shanks, B., Shima, T., Shirchenko, M., Snavely, K. J., Snyder, N., Soin, A., Suriano, A. M., Tedeschi, D., Thompson, J., Timkin, V., Tornow, W., Trimble, J. E., Varner, R. L., Vasilyev, S., Vetter, K., Vorren, K., White, B. R., Wilkerson, J. F., Wiseman, C., Xu, W., Yakushev, E., Young, A. R., Yu, C. -H., Yumatov, V., and Zhitnikov, I.

Subjects
Physics - Instrumentation and Detectors, Nuclear Experiment
Abstract

The Majorana Demonstrator is an ultra-low background physics experiment searching for the neutrinoless double beta decay of $^{76}$Ge. The Majorana Parts Tracking Database is used to record the history of components used in the construction of the Demonstrator. The tracking implementation takes a novel approach based on the schema-free database technology CouchDB. Transportation, storage, and processes undergone by parts such as machining or cleaning are linked to part records. Tracking parts provides a great logistics benefit and an important quality assurance reference during construction. In addition, the location history of parts provides an estimate of their exposure to cosmic radiation. A web application for data entry and a radiation exposure calculator have been developed as tools for achieving the extreme radio-purity required for this rare decay search.

Published
2015
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3. A Dark Matter Search with MALBEK

Author

Giovanetti, G. K., Abgrall, N., Aguayo, E., Avignone III, F. T., Barabash, A. S., Bertrand, F. E., Boswell, M., Brudanin, V., Busch, M., Byram, D., Caldwell, A. S., Chan, Y-D., Christofferson, C. D., Combs, D. C., Cuesta, C., Detwiler, J. A., Doe, P. J., Efremenko, Yu., Egorov, V., Ejiri, H., Elliott, S. R., Fast, J. E., Finnerty, P., Fraenkle, F. M., Galindo-Uribarri, A., Goett, J., Green, M. P., Gruszko, J., Guiseppe, V. E., Gusev, K., Hallin, A. L., Hazama, R., Hegai, A., Henning, R., Hoppe, E. W., Howard, S., Howe, M. A., Keeter, K. J., Kidd, M. F., Kochetov, O., Konovalov, S. I., Kouzes, R. T., LaFerriere, B. D., Leon, J., Leviner, L. E., Loach, J. C., MacMullin, J., MacMullin, S., Martin, R. D., Meijer, S., Mertens, S., Nomachi, M., Orrell, J. L., O'Shaughnessy, C., Overman, N. R., Phillips II, D. G., Poon, A. W. P., Pushkin, K., Radford, D. C., Rager, J., Rielage, K., Robertson, R. G. H., Romero-Romero, E., Ronquest, M. C., Schubert, A. G., Shanks, B., Shima, T., Shirchenko, M., Snavely, K. J., Snyder, N., Suriano, A. M., Thompson, J., Timkin, V., Tornow, W., Trimble, J. E., Varner, R. L., Vasilyev, S., Vetter, K., Vorren, K., White, B. R., Wilkerson, J. F., Wiseman, C., Xu, W., Yakushev, E., Young, A. R., Yu, C. -H., and Yumatov, V.

Subjects
Nuclear Experiment, High Energy Physics - Experiment, Physics - Instrumentation and Detectors
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

4. Background Model for the Majorana Demonstrator

Author

Cuesta, C., Abgrall, N., Aguayo, E., Avignone III, F. T., Barabash, A. S., Bertrand, F. E., Boswell, M., Brudanin, V., Busch, M., Byram, D., Caldwell, A. S., Chan, Y-D., Christofferson, C. D., Combs, D. C., Detwiler, J. A., Doe, P. J., Efremenko, Yu., Egorov, V., Ejiri, H., Elliott, S. R., Fast, J. E., Finnerty, P., Fraenkle, F. M., Galindo-Uribarri, A., Giovanetti, G. K., Goett, J., Green, M. P., Gruszko, J., Guiseppe, V. E., Gusev, K., Hallin, A. L., Hazama, R., Hegai, A., Henning, R., Hoppe, E. W., Howard, S., Howe, M. A., Keeter, K. J., Kidd, M. F., Kochetov, O., Konovalov, S. I., Kouzes, R. T., LaFerriere, B. D., Leon, J., Leviner, L. E., Loach, J. C., MacMullin, J., MacMullin, S., Martin, R. D., Meijer, S., Mertens, S., Nomachi, M., Orrell, J. L., O'Shaughnessy, C., Overman, N. R., Phillips II, D. G., Poon, A. W. P., Pushkin, K., Radford, D. C., Rager, J., Rielage, K., Robertson, R. G. H., Romero-Romero, E., Ronquest, M. C., Schubert, A. G., Shanks, B., Shima, T., Shirchenko, M., Snavely, K. J., Snyder, N., Suriano, A. M., Thompson, J., Timkin, V., Tornow, W., Trimble, J. E., Varner, R. L., Vasilyev, S., Vetter, K., Vorren, K., White, B. R., Wilkerson, J. F., Wiseman, C., Xu, W., Yakushev, E., Young, A. R., Yu, C. H., and Yumatov, V.

Subjects
Physics - Instrumentation and Detectors, Nuclear Experiment
Abstract

The Majorana Collaboration is constructing a system containing 40 kg 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., 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

5. Testing the Ge detectors for the MAJORANA DEMONSTRATOR

Author

Xu, W., Abgrall, N., Aguayo, E., Avignone III, F. T., Barabash, A. S., Bertrand, F. E., Boswell, M., Brudanin, V., Busch, M., Byram, D., Caldwell, A. S., Chan, Y-D., Christofferson, C. D., Combs, D. C., Cuesta, C., Detwiler, J. A., Doe, P. J., Efremenko, Yu., Egorov, V., Ejiri, H., Elliott, S. R., Fast, J. E., Finnerty, P., Fraenkle, F. M., Galindo-Uribarri, A., Giovanetti, G. K., Goett, J., Green, M. P., Gruszko, J., Guiseppe, V. E., Gusev, K., Hallin, A. L., Hazama, R., Hegai, A., Henning, R., Hoppe, E. W., Howard, S., Howe, M. A., Keeter, K. J., Kidd, M. F., Kochetov, O., Konovalov, S. I., Kouzes, R. T., LaFerriere, B. D., Leon, J., Leviner, L. E., Loach, J. C., MacMullin, J., MacMullin, S., Martin, R. D., Meijer, S., Mertens, S., Nomachi, M., Orrell, J. L., O'Shaughnessy, C., Overman, N. R., Phillips II, D. G., Poon, A. W. P., Pushkin, K., Radford, D. C., Rager, J., Rielage, K., Robertson, R. G. H., Romero-Romero, E., Ronquest, M. C., Schubert, A. G., Shanks, B., Shima, T., Shirchenko, M., Snavely, K. J., Snyder, N., Suriano, A. M., Thompson, J., Timkin, V., Tornow, W., Trimble, J. E., Varner, R. L., Vasilyev, S., Vetter, K., Vorren, K., White, B. R., Wilkerson, J. F., Wiseman, C., Yakushev, E., Young, A. R., Yu, C. H., and Yumatov, V.

Subjects
Physics - Instrumentation and Detectors, Nuclear Experiment
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
2014

6. A search for bremsstrahlung solar axions using the Majorana low-background BEGe detector at Kimballton (MALBEK)

Author

Abgrall, N., Aguayo, E., Avignone III, F. T., Barabash, A. S., Bertrand, F. E., Boswell, M., Brudanin, V., Busch, M., Caldwell, A. S., Chan, Y-D., Christofferson, C. D., Combs, D. C., Cooper, R. J., Creswick, R. J., Detwiler, J. A., Doe, P. J., Efremenko, Yu., Egorov, V., Elliott, S. R., Fast, J. E., Finnerty, P., Fraenkle, F. M., Galindo-Uribarri, A., Giovanetti, G. K., Goett, J., Green, M. P., Gruszko, J., Guiseppe, V. E., Gusev, K., Hegai, A., Henning, R., Hoppe, E. W., Howard, S., Howe, M. A., Keeter, K. J., Kidd, M. F., Knecht, A., Kochetov, O., Konovalov, S. I., Kouzes, R. T., LaFerriere, B. D., Leon, J., Leviner, L. E., Loach, J. C., MacMullin, J., MacMullin, S., Marino, M. G., Martin, R. D., Mertens, S., Orrell, J. L., O'Shaughnessy, C., Overman, N. R., Phillips II, D. G., Poon, A. W. P., Pushkin, K., Radford, D. C., Rielage, K., Robertson, R. G. H., Ronquest, M. C., Schubert, A. G., Shanks, B., Shirchenko, M., Snavely, K. J., Snyder, N., Steele, D., Suriano, A. M., Thompson, J., Timkin, V., Varner, R. L., Vasilyev, S., Vetter, K., Vorren, K., White, B. R., Wilkerson, J. F., Xu, W., Yakushev, E., Young, A. R., Yu, C. H., and Yumatov, V.

Subjects
Astrophysics - High Energy Astrophysical Phenomena, High Energy Physics - Phenomenology
Abstract

A low-background, high-purity germanium detector has been used to search for evidence of low-energy, bremsstrahlung-generated solar axions. An upper bound of $1.36\times 10^{-11}$ $(95% CL)$ is placed on the direct coupling of DFSZ model axions to electrons. The prospects for the sensitivity of the Majorana Demonstrator array of point-contact germanium detectors to solar axions are discussed in the context of the model-independent annual modulation due to the seasonal variation of the earth-sun distance., Comment: This paper has been withdrawn by the authors. Recent results we were not aware of should be taken into account

Published
2014

7. Status of the MAJORANA DEMONSTRATOR experiment

Author

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

Subjects
Physics - Instrumentation and Detectors, Nuclear Experiment
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., Comment: 8 pages, proceeding from VII International Conference on Interconnections between Particle Physics and Cosmology (PPC 2013), submitted to AIP proceedings

Published
2013

8. The {\sc Majorana Demonstrator} Neutrinoless Double-Beta Decay Experiment

Author

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

Subjects
Physics - Instrumentation and Detectors, Nuclear Experiment
Abstract

The {\sc Majorana Demonstrator will search for the neutrinoless double-beta decay of the isotope Ge-76 with a mixed array of enriched and natural germanium detectors. The observation of this rare decay would indicate 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 {\sc 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 {\sc Demonstrator} and the details of its design., Comment: accepted for publication in Advances in High Energy Physics

Published
2013

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

Author

MAJORANA Collaboration, Elliott, S. R., Abgrall, N., Aguayo, E., Avignone III, F. T., Barabash, A. S., Bertrand, F. E., Boswell, M., Brudanin, V., Busch, M., Caldwell, A. S., Chan, Y-D., Christofferson, C. D., Combs, D. C., Detwiler, J. A., Doe, P. J., Efremenko, Yu., Egorov, V., Ejiri, H., Esterline, J., Fast, J. E., Finnerty, P., Fraenkleo, F. M., Galindo-Uribarri, A., Giovanetti, G. K., Goett, J., Green, M. P., Gruszko, J., Guiseppe, V. E., Gusev, K., Hallin, A. L., Hazama, R., Hegai, A., Henning, R., Hoppe, E. W., Howard, S., Howe, M. A., Keeter, K. J., Kidd, M. F., Kochetov, O., Konovalov, S. I., Kouzes, R. T., LaFerriere, B. D., Leon, J., Leviner, L. E., Loach, J. C., MacMullin, S., Martin, R. D., Mertens, S., Mizouni, L., Nomachi, M., Orrell, J. L., OShaughnessy, C., Overman, N. R., Phillips II, D. G., Poon, A. W. P., Pushkin, K., Radford, D. C., Rielage, K., Robertson, R. G. H., Ronquest, M. C., Schubert, A. G., Shanks, B., Shima, T., Shirchenko, M., Snavely, K. J., Snyder, N., Soin, A., Strain, J., Suriano, A. M., Timkin, V., Tornow, W., Varner, R. L., Vasilyev, S., Vetter, K., Vorren, K., White, B. R., Wilkerson, J. F., Xu, W., Yakushev, E., Young, A. R., Yu, C. -H., and Yumatov, V.

Subjects
Physics - Instrumentation and Detectors, High Energy Physics - Experiment, Nuclear Experiment
Abstract

The {\sc Majorana} collaboration is searching for neutrinoless double beta decay using $^{76}$Ge, which has been shown to have a number of advantages in terms of sensitivities and backgrounds. The observation of neutrinoless double-beta decay would show that lepton number is violated and that neutrinos are Majorana particles and would simultaneously provide information on neutrino mass. Attaining sensitivities for neutrino masses in the inverted hierarchy region, $15 - 50$ meV, will require large, tonne-scale detectors with extremely low backgrounds, at the level of $\sim$1 count/t-y or lower in the region of the signal. The {\sc Majorana} collaboration, with funding support from DOE Office of Nuclear Physics and NSF Particle Astrophysics, is constructing the {\sc Demonstrator}, an array consisting of 40 kg of p-type point-contact high-purity germanium (HPGe) detectors, of which $\sim$30 kg will be enriched to 87% in $^{76}$Ge. The {\sc Demonstrator} is being constructed in a clean room laboratory facility at the 4850' level (4300 m.w.e.) of the Sanford Underground Research Facility (SURF) in Lead, SD. It utilizes a compact graded shield approach with the inner portion consisting of ultra-clean Cu that is being electroformed and machined underground. The primary aim of the {\sc Demonstrator} is to show the feasibility of a future tonne-scale measurement in terms of backgrounds and scalability., Comment: Proceedings for the MEDEX 2013 Conference

Published
2013

10. The MAJORANA DEMONSTRATOR: Progress towards showing the feasibility of a tonne-scale 76Ge neutrinoless double-beta decay experiment

Author

Finnerty, P., Aguayo, E., Amman, M., Avignone. III, F. T., Barabash, A. S., Barton, P. J., Beene, J. R., Bertrand, F. E., Boswell, M., Brudanin, V., Busch, M., Chan, Y. -D., Christofferson, C. D., Collar, J. I., Combs, D. C., Cooper, R. J., Detwiler, J. A., Doe, P. J., Efremenko, Yu., Egorov, V., Ejiri, H., Elliott, S. R., Esterline, J., Fast, J. E., Fields, N., Fraenkle, F. M., Galindo-Uribarri, A., Gehman, V. M., Giovanetti, G. K., Green, M. P., Guiseppe, V. E., Gusey, K., Hallin, A. L., Hazama, R., Henning, R., Hoppe, E. W., Horton, M., Howard, S., Howe, M. A., Johnson, R. A., Keeter, K. J., Kidd, M. F., Knecht, A., Kochetov, O., Konovalov, S. I., Kouzes, R. T., LaFerriere, B. D., Leon, J., Leviner, L. E., Loach, J. C., Luke, P. N., MacMullin, S., Marino, M. G., Martin, R. D., Merriman, J. H., Miller, M. L., Mizouni, L., Nomachi, M., Orrell, J. L., Overman, N. R., Perumpilly, G., Phillips. II, D. G., Poon, A. W. P., Radford, D. C., Rielage, K., Robertson, R. G. H., Ronquest, M. C., Schubert, A. G., Shima, T., Shirchenko, M., Snavely, K. J., Steele, D., Strain, J., Timkin, V., Tornow, W., Varner, R. L., Vetter, K., Vorren, K., Wilkerson, J. F., Yakushev, E., Yaver, H., Young, A. R., and Yumatov., C-H. Yu. and. V.

Subjects
Nuclear Experiment
Abstract

The MAJORANA DEMONSTRATOR will search for the neutrinoless double-beta decay 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 neutrinoless double-beta decay [H. V. Klapdor-Kleingrothaus and I. V. Krivosheina, Mod. Phys. Lett. A21, 1547 (2006)]; and performing a direct search for light WIMPs (3-10 GeV)., Comment: 6 pages, 2 figures. Proceedings from the 18th International Symposium on Particles, Strings and Cosmology in Merida, Mexico, June 3-8, 2012. To be published in IOP Conference Series. http://www.fisica.unam.mx/pascos2012/

Published
2012

11. Characteristics of Signals Originating Near the Lithium-Diffused N+ Contact of High Purity Germanium P-Type Point Contact Detectors

Author

The MAJORANA Collaboration, Aguayo, E., Amman, M., Avignone III, F. T., Barabash, A. S., Barton, P. J., Beene, J. R., Bertrand, F. E., Boswell, M., Brudanin, V., Busch, M., Chan, Y-D., Christofferson, C. D., Collar, J. I., Combs, D. C., Cooper, R. J., Detwiler, J. A., Doe, P. J., Efremenko, Yu., Egorov, V., Ejiri, H., Elliott, S. R., Esterline, J., Fast, J. E., Fields, N., Finnerty, P., Fraenkle, F. M., Galindo-Uribarri, A., Gehman, V. M., Giovanetti, G. K., Green, M. P., Guiseppe, V. E., Gusey, K., Hallin, A. L., Hazama, R., Henning, R., Hoppe, E. W., Horton, M., Howard, S., Howe, M. A., Johnson, R. A., Keeter, K. J., Kidd, M. F., Knecht, A., Kochetov, O., Konovalov, S. I., Kouzes, R. T., LaFerriere, B. D., Leon, J., Leviner, L. E., Loach, J. C., Looker, Q., Luke, P. N., MacMullin, S., Marino, M. G., Martin, R. D., Merriman, J. H., Miller, M. L., Mizouni, L., Nomachi, M., Orrell, J. L., Overman, N. R., Perumpilly, G., Phillips II, D. G., Poon, A. W. P., Radford, D. C., Rielage, K., Robertson, R. G. H., Ronquest, M. C., Schubert, A. G., Shima, T., Shirchenko, M., Snavely, K. J., Steele, D., Strain, J., Timkin, V., Tornow, W., Varner, R. L., Vetter, K., Vorren, K., Wilkerson, J. F., Yakushev, E., Yaver, H., Young, A. R., Yu, C. -H., and Yumatov, V.

Subjects
Physics - Instrumentation and Detectors, High Energy Physics - Experiment, Nuclear Experiment
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., Comment: 32 pages, 14 figures, submitted to Nucl. Instrum. Meth. A

Published
2012

12. The Majorana experiment: an ultra-low background search for neutrinoless double-beta decay

Author

Phillips II, D. G., Aguayo, E., Avignone III, F. T., Back, H. O., Barabash, A. S., Bergevin, M., Bertrand, F. E., Boswell, M., Brudanin, V., Busch, M., Chan, Y. -D., Christofferson, C. D., Collar, J. I., Combs, D. C., Cooper, R. J., Detwiler, J. A., Doe, P. J., Efremenko, Y., Egorov, V., Ejiri, H., Elliott, S. R., Esterline, J., Fast, J. E., Fields, N., Finnerty, P., Fraenkle, F. M., Gehman, V. M., Giovanetti, G. K., Green, M. P., Guiseppe, V. E., Gusey, K., Hallin, A. L., Hazama, R., Henning, R., Hime, A., Hoppe, E. W., Horton, M., Howard, S., Howe, M. A., Johnson, R. A., Keeter, K. J., Keller, C., Kidd, M. F., Knecht, A., Kochetov, O., Konovalov, S. I., Kouzes, R. T., LaFerriere, B., LaRoque, B. H., Leon, J., Leviner, L. E., Loach, J. C., MacMullin, S., Marino, M. G., Martin, R. D., Mei, D. -M., Merriman, J., Miller, M. L., Mizouni, L., Nomachi, M., Orrell, J. L., Overman, N. R., Poon, A. W. P., Perumpilly, G., Prior, G., Radford, D. C., Rielage, K., Robertson, R. G. H., Ronquest, M. C., Schubert, A. G., Shima, T., Shirchenko, M., Snavely, K. J., Steele, D., Strain, J., Thomas, K., Timkin, V., Tornow, W., Vanyushin, I., Varner, R. L., Vetter, K., Vorren, K., Wilkerson, J. F., Wolfe, B. A., Yakushev, E., Young, A. R., Yu, C. -H., Yumatov, V., and Zhang, C.

Subjects
Nuclear Experiment, Physics - Instrumentation and Detectors
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
2011
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13. The Majorana Demonstrator

Author

Aguayo, E., Fast, J. E., Hoppe, E. W., Keillor, M. E., Kephart, J. D., Kouzes, R. T., LaFerriere, B. D., Merriman, J., Orrell, J. L., Overman, N. R., Avignone III, F. T., Back, H. O., Combs, D. C., Leviner, L. E., Young, A. R., Barabash, A. S., Konovalov, S. I., Vanyushin, I., Yumatov, V., Bergevin, M., Chan, Y-D., Detwiler, J. A., Loach, J. C., Martin, R. D., Poon, A. W. P., Prior, G., Vetter, K., Bertrand, F. E., Cooper, R. J., Radford, D. C., Varner, R. L., Yu, C. -H., Boswell, M., Elliott, S. R., Gehman, V. M., Hime, A., Kidd, M. F., LaRoque, B. H., Rielage, K., Ronquest, M. C., Steele, D., Brudanin, V., Egorov, V., Gusey, K., Kochetov, O., Shirchenko, M., Timkin, V., Yakushev, E., Busch, M., Esterline, J., Tornow, W., Christofferson, C. D., Horton, M., Howard, S., Sobolev, V., Collar, J. I., Fields, N., Creswick, R. J., Doe, P. J., Johnson, R. A., Knecht, A., Leon, J., Marino, M. G., Miller, M. L., Robertson, R. G. H., Schubert, A. G., Wolfe, B. A., Efremenko, Yu., Ejiri, H., Hazama, R., Nomachi, M., Shima, T., Finnerty, P., Fraenkle, F. M., Giovanetti, G. K., Green, M. P., Henning, R., Howe, M. A., MacMullin, S., Phillips II, D. G., Snavely, K. J., Strain, J., Vorren, K., Guiseppe, V. E., Keller, C., Mei, D. -M., Perumpilly, G., Thomas, K., Zhang, C., Hallin, A. L., Keeter, K. J., Mizouni, L., and Wilkerson, J. F.

Subjects
Nuclear Experiment
Abstract

A brief review of the history and neutrino physics of double beta decay is given. A description of the MAJORANA DEMONSTRATOR research and development program including background reduction techniques is presented in some detail. The application of point contact (PC) detectors to the experiment is discussed, including the effectiveness of pulse shape analysis. The predicted sensitivity of a PC detector array enriched to 86% in 76Ge is given., Comment: To be published in the DPF-2011 Conference Proceedings

Published
2011

14. Depth Requirements for a Tonne-scale 76Ge Neutrinoless Double-beta Decay Experiment

Author

The MAJORANA Collaboration, Aguayo, E., Avignone III, F. T., Back, H. O., Barabash, A. S., Bergevin, M., Bertrand, F. E., Boswell, M., Brudanin, V., Busch, M., Chan, Y-D., Christofferson, C. D., Collar, J. I., Combs, D. C., Cooper, R. J., Detwiler, J. A., Doe, P. J., Efremenko, Yu., Egorov, V., Ejiri, H., Elliott, S. R., Esterline, J., Fast, J. E., Fields, N., Finnerty, P., Fraenkle, F. M., Gehman, V. M., Giovanetti, G. K., Green, M. P., Guiseppe, V. E., Gusey, K., Hallin, A. L., Hazama, R., Henning, R., Hime, A., Hoppe, E. W., Horton, M., Howard, S., Howe, M. A., Johnson, R. A., Keeter, K. J., Keillor, M. E., Keller, C., Kephart, J. D., Kidd, M. F., Knecht, A., Kochetov, O., Konovalov, S. I., Kouzes, R. T., LaFerriere, B. D., LaRoque, B. H., Leon, J., Leviner, L. E., Loach, J. C., MacMullin, S., Marino, M. G., Martin, R. D., Mei, D. -M., Merriman, J. H., Miller, M. L., Mizouni, L., Nomachi, M., Orrell, J. L., Overman, N. R., Phillips II, D. G., Poon, A. W. P., Perumpilly, G., Prior, G., Radford, D. C., Rielage, K., Robertson, R. G. H., Ronquest, M. C., Schubert, A. G., Shima, T., Shirchenko, M., Snavely, K. J., Sobolev, V., Steele, D., Strain, J., Thomas, K., Timkin, V., Tornow, W., Vanyushin, I., Varner, R. L., Vetter, K., Vorren, K., Wilkerson, J. F., Wolfe, B. A., Yakushev, E., Young, A. R., Yu, C. -H., Yumatov, V., and Zhang, C.

Subjects
Nuclear Experiment
Abstract

Neutrinoless double-beta decay experiments can potentially determine the Majorana or Dirac nature of the neutrino, and aid in understanding the neutrino absolute mass scale and hierarchy. Future 76Ge-based searches target a half-life sensitivity of >10^27 y to explore the inverted neutrino mass hierarchy. Reaching this sensitivity will require a background rate of <1 count tonne^-1 y^-1 in a 4-keV-wide spectral region of interest surrounding the Q value of the decay. We investigate the overburden required to reach this background goal in a tonne-scale experiment with a compact (copper and lead) shield based on Monte Carlo calculations of cosmic-ray background rates. We find that, in light of the presently large uncertainties in these types of calculations, a site with an underground depth >~5200 mwe is required for a tonne-scale experiment with a compact shield similar to the planned 40-kg MAJORANA DEMONSTRATOR. The required overburden is highly dependent on the chosen shielding configuration and could be relaxed significantly if, for example, a liquid cryogen and water shield, or an active neutron shield were employed. Operation of the MAJORANA DEMONSTRATOR and GERDA detectors will serve to reduce the uncertainties on cosmic-ray background rates and will impact the choice of shielding style and location for a future tonne-scale experiment. 4/2013: The peer review process revealed that one of the veto rejection factors (the factor-of-4 described on p12) needs to be better established. Our reevaluation of this parameter to date has not yielded strong support for the value stated in the manuscript, and we require further study to develop a solid estimate. This further study will supersede the work described in this manuscript, and may or may not lead to the same conclusion regarding the ~>5200 mwe requirement for future tonne-scale 76Ge neutrinoless double beta decay experiments., Comment: Corresponding author: J. Detwiler (jasondet@uw.edu), 25 pages, 2 figures

Published
2011

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

Author

MAJORANA Collaboration, Schubert, A. G., Aguayo, E., Avignone III, F. T., Back, H. O., Barabash, A. S., Bergevin, M., Bertrand, F. E., Boswell, M., Brudanin, V., Busch, M., Chan, Y-D., Christofferson, C. D., Collar, J. I., Combs, D. C., Cooper, R. J., Detwiler, J. A., Leon, J., Doe, P. J., Efremenko, Yu., Egorov, V., Ejiri, H., Elliott, S. R., Esterline, J., Fast, J. E., Fields, N., Finnerty, P., Fraenkle, F. M., Gehman, V. M., Giovanetti, G. K., Green, M. P., Guiseppe, V. E., Gusey, K., Hallin, A. L., Hazama, R., Henning, R., Hime, A., Hoppe, E. W., Horton, M., Howard, S., Howe, M. A., Johnson, R. A., Keeter, K. J., Keillor, M. E., Keller, C., Kephart, J. D., Kidd, M. F., Knecht, A., Kochetov, O., Konovalov, S. I., Kouzes, R. T., LaFerriere, B., LaRoque, B. H., Leviner, L. E., Loach, J. C., MacMullin, S., Marino, M. G., Martin, R. D., Mei, D. -M., Merriman, J., Miller, M. L., Mizouni, L., Nomachi, M., Orrell, J. L., Overman, N., Phillips II, D. G., Poon, A. W. P., Perumpilly, G., Prior, G., Radford, D. C., Rielage, K., Robertson, R. G. H., Ronquest, M. C., Shima, T., Shirchenko, M., Snavely, K. J., Sobolev, V., Steele, D., Strain, J., Thomas, K., Timkin, V., Tornow, W., Vanyushin, I., Varner, R. L., Vetter, K., Vorren, K., Wilkerson, J. F., Wolfe, B. A., Yakushev, E., Young, A. R., Yu, C. ?H., Yumatov, V., and Zhan, C.

Subjects
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., Comment: 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
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16. THE MAJORANA DOUBLE BETA DECAY EXPERIMENT: PRESENT STATUS

Author

Aguayo, E., primary, Avignone, F. T., additional, Back, H. O., additional, Barabash, A. S., additional, Beene, J. R., additional, Bergevin, M., additional, Bertrand, F. E., additional, Boswell, M., additional, Brudanin, V., additional, Busch, M., additional, Chan, Y-D., additional, Christofferson, C. D., additional, Collar, J. I., additional, Combs, D. C., additional, Cooper, R. J., additional, Detwiler, J. A., additional, Doe, P. J., additional, Efremenko, Yu., additional, Egorov, V., additional, Ejiri, H., additional, Elliott, S. R., additional, Esterline, J., additional, Fast, J. E., additional, Fields, N., additional, Finnerty, P., additional, Fraenkle, F. M., additional, Gehman, V. M., additional, Giovanetti, G. K., additional, Green, M. P., additional, Guiseppe, V. E., additional, Gusey, K., additional, Hallin, A. L., additional, Hazama, R., additional, Henning, R., additional, Hime, A., additional, Hoppe, E. W., additional, Horton, M., additional, Howard, S., additional, Howe, M. A., additional, Johnson, R. A., additional, Keeter, K. J., additional, Keller, C., additional, Kidd, M. F., additional, Knecht, A., additional, Kochetov, O., additional, Konovalov, S. I., additional, Kouzes, R. T., additional, LaFerriere, B. D., additional, LaRoque, B. H., additional, Leon, J., additional, Leviner, L. E., additional, Loach, J. C., additional, MacMullin, S., additional, Marino, M. G., additional, Martin, R. D., additional, Mei, D.-M., additional, Merriman, J. H., additional, Miller, M. L., additional, Mizouni, L., additional, Nomachi, M., additional, Orrell, J. L., additional, Overman, N. R., additional, Phillips, D. G., additional, Poon, A. W. P., additional, Perumpilly, G., additional, Prior, G., additional, Radford, D. C., additional, Rielage, K., additional, Robertson, R. G. H., additional, Ronquest, M. C., additional, Schubert, A. G., additional, Shima, T., additional, Shirchenko, M., additional, Snavely, K. J., additional, Steele, D., additional, Strain, J., additional, Thomas, K., additional, Timkin, V., additional, Tornow, W., additional, Vanyushin, I., additional, Varner, R. L., additional, Vetter, K., additional, Vorren, K., additional, Wilkerson, J. F., additional, Yakushev, E., additional, Young, A. R., additional, Yu, C.-H., additional, Yumatov, V. I., additional, and Zhang, C., additional

Published
2013
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17. The MAJORANA DEMONSTRATOR Neutrinoless Double-Beta Decay Experiment

Author

Ejiri, H., Egorov, V., Finnerty, P., Combs, D. C., Elliott, S. R., Fraenkle, F. M., Bertrand, F. E., Hallin, A. L., Gusev, K., Boswell, M., Efremenko, Yu., Abgrall, N., Galindo-Uribarri, A., Doe, P. J., Fast, J. E., Aguayo, E., Esterline, J., Busch, M., Avignone, F. T., Hegai, A., Guiseppe, V. E., Hazama, R., Giovanetti, G. K., Caldwell, A. S., Chan, Y.-D., Gruszko, J., Green, M. P., Brudanin, V., Barabash, A. S., Detwiler, J. A., Christofferson, C. D., and Goett, J.

Subjects
Physics::Instrumentation and Detectors, High Energy Physics::Phenomenology, High Energy Physics::Experiment
Abstract

The MAJORANA DEMONSTRATOR will search for the neutrinoless double-beta 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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18. Status of the Majorana Demonstrator experiment

Author

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

Published
2014
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19. The MAJORANA DEMONSTRATOR Neutrinoless Double-Beta Decay Experiment

Author

Abgrall, N., primary, Aguayo, E., additional, Avignone, F. T., additional, Barabash, A. S., additional, Bertrand, F. E., additional, Boswell, M., additional, Brudanin, V., additional, Busch, M., additional, Caldwell, A. S., additional, Chan, Y.-D., additional, Christofferson, C. D., additional, Combs, D. C., additional, Detwiler, J. A., additional, Doe, P. J., additional, Efremenko, Yu., additional, Egorov, V., additional, Ejiri, H., additional, Elliott, S. R., additional, Esterline, J., additional, Fast, J. E., additional, Finnerty, P., additional, Fraenkle, F. M., additional, Galindo-Uribarri, A., additional, Giovanetti, G. K., additional, Goett, J., additional, Green, M. P., additional, Gruszko, J., additional, Guiseppe, V. E., additional, Gusev, K., additional, Hallin, A. L., additional, Hazama, R., additional, Hegai, A., additional, Henning, R., additional, Hoppe, E. W., additional, Howard, S., additional, Howe, M. A., additional, Keeter, K. J., additional, Kidd, M. F., additional, Knecht, A., additional, Kochetov, O., additional, Konovalov, S. I., additional, Kouzes, R. T., additional, LaFerriere, B. D., additional, Leon, J., additional, Leviner, L. E., additional, Loach, J. C., additional, Luke, P. N., additional, MacMullin, S., additional, Martin, R. D., additional, Mertens, S., additional, Mizouni, L., additional, Nomachi, M., additional, Orrell, J. L., additional, O'Shaughnessy, C., additional, Overman, N. R., additional, Phillips, David, additional, Poon, A. W. P., additional, Pushkin, K., additional, Radford, D. C., additional, Rielage, K., additional, Robertson, R. G. H., additional, Ronquest, M. C., additional, Schubert, A. G., additional, Shanks, B., additional, Shima, T., additional, Shirchenko, M., additional, Snavely, K. J., additional, Snyder, N., additional, Steele, D., additional, Strain, J., additional, Suriano, A. M., additional, Thompson, J., additional, Timkin, V., additional, Tornow, W., additional, Varner, R. L., additional, Vasilyev, S., additional, Vetter, K., additional, Vorren, K., additional, White, B. R., additional, Wilkerson, J. F., additional, Williams, T., additional, Xu, W., additional, Yakushev, E., additional, Young, A. R., additional, Yu, C.-H., additional, and Yumatov, V., additional

Published
2014
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20. The Majorana Demonstrator: A search for neutrinoless double-beta decay of germanium-76

Author

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

Published
2013
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21. The MAJORANA experiment: an ultra-low background search for neutrinoless double-beta decay

Author

Phillips, D G, primary, Aguayo, E, additional, Avignone, F T, additional, Back, H O, additional, Barabash, A S, additional, Bergevin, M, additional, Bertrand, F E, additional, Boswell, M, additional, Brudanin, V, additional, Busch, M, additional, Chan, Y-D, additional, Christofferson, C D, additional, Collar, J I, additional, Combs, D C, additional, Cooper, R J, additional, Detwiler, J A, additional, Doe, P J, additional, Efremenko, V, additional, Egorov, V, additional, Ejiri, H, additional, Elliott, S R, additional, Esterline, J, additional, Fast, J E, additional, Fields, N, additional, Finnerty, P, additional, Fraenkle, F M, additional, Gehman, V M, additional, Giovanetti, G K, additional, Green, M P, additional, Guiseppe, V E, additional, Gusey, K, additional, Hallin, A L, additional, Hazama, R, additional, Henning, R, additional, Hime, A, additional, Hoppe, E W, additional, Horton, M, additional, Howard, S, additional, Howe, M A, additional, Johnson, R A, additional, Keeter, K J, additional, Keller, C, additional, Kidd, M F, additional, Knecht, A, additional, Kochetov, O, additional, Konovalov, S I, additional, Kouzes, R T, additional, LaFerriere, B, additional, LaRoque, B H, additional, Leon, J, additional, Leviner, L E, additional, Loach, J C, additional, MacMullin, S, additional, Marino, M G, additional, Martin, R D, additional, Mei, D-M, additional, Merriman, J, additional, Miller, M L, additional, Mizouni, L, additional, Nomachi, M, additional, Orrell, J L, additional, Overman, N R, additional, Poon, A W P, additional, Perumpilly, G, additional, Prior, G, additional, Radford, D C, additional, Rielage, K, additional, Robertson, R G H, additional, Ronquest, M C, additional, Schubert, A G, additional, Shima, T, additional, Shirchenko, M, additional, Snavely, K J, additional, Steele, D, additional, Strain, J, additional, Thomas, K, additional, Timkin, V, additional, Tornow, W, additional, Vanyushin, I, additional, Varner, R L, additional, Vetter, K, additional, Vorren, K, additional, Wilkerson, J F, additional, Wolfe, B A, additional, Yakushev, E, additional, Young, A R, additional, Yu, C -H, additional, Yumatov, V, additional, and Zhang, C, additional

Published
2012
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22. The MAJORANA DEMONSTRATOR: A Search for Neutrinoless Double-beta Decay of Germanium-76.

Author

Elliott, S. R., Abgrall, N., Aguayo, E., Avignone III, F. T., Barabash, A. S., Bertrand, F. E., Boswell, M., Brudaning, V., Buschh, M., Caldwell, A. S., Chan, Y-D., Christofferson, C. D., Combs, D. C., Detwiler, J. A., Doe, P. J., Efremenko, Yu., Egorovg, V., Ejirin, H., Esterline, J., and Fast, J. E.

Subjects
NEUTRINOLESS double beta decay, BETA decay, GERMANIUM, NEUTRINOS, PARTICLE detectors
Abstract

The MAJORANA collaboration is searching for neutrinoless double beta decay using 76Ge, which has been shown to have a number of advantages in terms of sensitivities and backgrounds. The observation of neutrinoless double-beta decay would show that lepton number is violated and that neutrinos are Majorana particles and would simultaneously provide information on neutrino mass. Attaining sensitivities for neutrino masses in the inverted hierarchy region, 15-50 meV, will require large, tonne-scale detectors with extremely low backgrounds, at the level of ~1 count/t-y or lower in the region of the signal. The MAJORANA collaboration, with funding support from DOE Office of Nuclear Physics and NSF Particle Astrophysics, is constructing the DEMONSTRATOR, an array consisting of 40 kg of p-type point-contact high-purity germanium (HPGe) detectors, of which ~30 kg will be enriched to 87% in 76Ge. The DEMONSTRATOR is being constructed in a clean room laboratory facility at the 4850' level (4300 m.w.e.) of the Sanford Underground Research Facility (SURF) in Lead, SD. It utilizes a compact graded shield approach with the inner portion consisting of ultra-clean Cu that is being electroformed and machined underground. The primary aim of the DEMONSTRATOR is to show the feasibility of a future tonne-scale measurement in terms of backgrounds and scalability. [ABSTRACT FROM AUTHOR]

Published
2013
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23. The Majorana Demonstrator: A Search for Neutrinoless Double-beta Decay of Germanium-76

Author

Wilkerson, J F, primary, Aguayo, E, additional, Avignone, F T, additional, Back, H O, additional, Barabash, A S, additional, Beene, J R, additional, Bergevin, M, additional, Bertrand, F E, additional, Boswell, M, additional, Brudanin, V, additional, Busch, M, additional, Chan, Y -D, additional, Christofferson, C D, additional, Collar, J I, additional, Combs, D C, additional, Cooper, R J, additional, Detwiler, J A, additional, Doe, P J, additional, Efremenko, Yu, additional, Egorov, V, additional, Ejiri, H, additional, Elliott, S R, additional, Esterline, J, additional, Fast, J E, additional, Fields, N, additional, Finnerty, P, additional, Fraenkle, F M, additional, Gehman, V M, additional, Giovanetti, G K, additional, Green, M P, additional, Guiseppe, V E, additional, Gusey, K, additional, Hallin, A L, additional, Hazama, R, additional, Henning, R, additional, Hoppe, E W, additional, Horton, M, additional, Howard, S, additional, Howe, M A, additional, Johnson, R A, additional, Keeter, K J, additional, Keller, C, additional, Kidd, M F, additional, Knecht, A, additional, Kochetov, O, additional, Konovalov, S I, additional, Kouzes, R T, additional, LaFerriere, B D, additional, LaRoque, B H, additional, Leon, J, additional, Leviner, L E, additional, Loach, J C, additional, MacMullin, S, additional, Marino, M G, additional, Martin, R D, additional, Mei, D -M, additional, Merriman, J H, additional, Miller, M L, additional, Mizouni, L, additional, Nomachi, M, additional, Orrell, J L, additional, Overman, N R, additional, Phillips, D G, additional, Poon, A W P, additional, Perumpilly, G, additional, Prior, G, additional, Radford, D C, additional, Rielage, K, additional, Robertson, R G H, additional, Ronquest, M C, additional, Schubert, A G, additional, Shima, T, additional, Shirchenko, M, additional, Snavely, K J, additional, Steele, D, additional, Strain, J, additional, Thomas, K, additional, Timkin, V, additional, Tornow, W, additional, Vanyushin, I, additional, Varner, R L, additional, Vetter, K, additional, Vorren, K, additional, Yakushev, E, additional, Young, A R, additional, Yu, C-H, additional, Yumatov, V, additional, and Zhang, C, additional

Published
2012
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24. Dark matter sensitivities of the Majorana Demonstrator

Author

Giovanetti, G K, primary, Aguayo, E, additional, Avignone, F T, additional, Back, H O, additional, Barabash, A S, additional, Beene, J R, additional, Bergevin, M, additional, Bertrand, F E, additional, Boswell, M, additional, Brudanin, V, additional, Busch, M, additional, Chan, Y -D, additional, Christofferson, C D, additional, Collar, J I, additional, Combs, D C, additional, Cooper, R J, additional, Detwiler, J A, additional, Doe, P J, additional, Efremenko, Yu, additional, Egorov, V, additional, Ejiri, H, additional, Elliott, S R, additional, Esterline, J, additional, Fast, J E, additional, Fields, N, additional, Finnerty, P, additional, Fraenkle, F M, additional, Gehman, V M, additional, Green, M P, additional, Guiseppe, V E, additional, Gusey, K, additional, Hallin, A L, additional, Hazama, R, additional, Henning, R, additional, Hoppe, E W, additional, Horton, M, additional, Howard, S, additional, Howe, M A, additional, Johnson, R A, additional, Keeter, K J, additional, Keller, C, additional, Kidd, M F, additional, Knecht, A, additional, Kochetov, O, additional, Konovalov, S I, additional, Kouzes, R T, additional, LaFerriere, B D, additional, LaRoque, B H, additional, Leon, J, additional, Leviner, L E, additional, Loach, J C, additional, MacMullin, S, additional, Marino, M G, additional, Martin, R D, additional, Mei, D -M, additional, Merriman, J H, additional, Miller, M L, additional, Mizouni, L, additional, Nomachi, M, additional, Orrell, J L, additional, Overman, N R, additional, Phillips, D G, additional, Poon, A W P, additional, Perumpilly, G, additional, Prior, G, additional, Radford, D C, additional, Rielage, K, additional, Robertson, R G H, additional, Ronquest, M C, additional, Schubert, A G, additional, Shima, T, additional, Shirchenko, M, additional, Snavely, K J, additional, Steele, D, additional, Strain, J, additional, Thomas, K, additional, Timkin, V, additional, Tornow, W, additional, Vanyushin, I, additional, Varner, R L, additional, Vetter, K, additional, Vorren, K, additional, Wilkerson, J F, additional, Yakushev, E, additional, Young, A R, additional, Yu, C -H, additional, Yumatov, V, additional, and Zhang, C, additional

Published
2012
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25. The Majorana Experiment

Author

Aguayo, E., primary, Avignone, F. T., additional, Back, H. O., additional, Barabash, A. S., additional, Bergevin, M., additional, Bertrand, F. E., additional, Boswell, M., additional, Brudanin, V., additional, Busch, M., additional, Chan, Y.-D., additional, Christofferson, C. D., additional, Collar, J. I., additional, Combs, D. C., additional, Cooper, R. J., additional, Detwiler, J. A., additional, Doe, P. J., additional, Efremenko, Yu., additional, Egorov, V., additional, Ejiri, H., additional, Elliott, S. R., additional, Esterline, J., additional, Fast, J. E., additional, Fields, N., additional, Finnerty, P., additional, Fraenkle, F. M., additional, Gehman, V. M., additional, Giovanetti, G. K., additional, Green, M. P., additional, Guiseppe, V. E., additional, Gusey, K., additional, Hallin, A. L., additional, Hazama, R., additional, Henning, R., additional, Hime, A., additional, Hoppe, E. W., additional, Horton, M., additional, Howard, S., additional, Howe, M. A., additional, Johnson, R. A., additional, Keeter, K. J., additional, Keillor, M. E., additional, Keller, C., additional, Kephart, J. D., additional, Kidd, M. F., additional, Knecht, A., additional, Kochetov, O., additional, Konovalov, S. I., additional, Kouzes, R. T., additional, LaFerriere, B. D., additional, LaRoque, B. H., additional, Leon, J., additional, Leviner, L. E., additional, Loach, J. C., additional, MacMullin, S., additional, Marino, M. G., additional, Martin, R. D., additional, Mei, D.-M., additional, Merriman, J. H., additional, Miller, M. L., additional, Mizouni, L., additional, Nomachi, M., additional, Orrell, J. L., additional, Overman, N. R., additional, Phillips, D. G., additional, Poon, A. W. P., additional, Perumpilly, G., additional, Prior, G., additional, Radford, D. C., additional, Rielage, K., additional, Robertson, R. G. H., additional, Ronquest, M. C., additional, Schubert, A. G., additional, Shima, T., additional, Shirchenko, M., additional, Snavely, K. J., additional, Sobolev, V., additional, Steele, D., additional, Strain, J., additional, Thomas, K., additional, Timkin, V., additional, Tornow, W., additional, Vanyushin, I., additional, Varner, R. L., additional, Vetter, K., additional, Vorren, K., additional, Wilkerson, J. F., additional, Wolfe, B. A., additional, Yakushev, E., additional, Young, A. R., additional, Yu, C.-H., additional, Yumatov, V., additional, Zhang, C., additional, Civitarese, Osvaldo, additional, Stekl, Ivan, additional, and Suhonen, Jouni, additional

Published
2011
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26. THE MAJORANA DOUBLE BETA DECAY EXPERIMENT: PRESENT STATUS.

Author

Aguayo, E., Avignone III, F. T., Back, H. O., Barabash, A. S., Beene, J. R., Bergevin, M., Bertrand, F. E., Boswell, M., Brudanin, V., Busch, M., Chan, Y.-D., Christofferson, C. D., Collar, J. I., Combs, D. C., Cooper, R. J., Detwiler, J. A., Doe, P. J., Efremenko, Yu., Egorov, V., and Ejiri, H.

Subjects
NEUTRINOS, ORIGANUM, GERMANIUM, LEPTONS (Nuclear physics), RESEARCH & development
Published
2012

28. THE MAJORANA DEMONSTRATOR: OVERVIEW AND STATUS UPDATE.

Author

Keeter, K. J., Abgrall, N., Aguayo, E., Avignone III, F. T., Barabash, A. S., Bertrand, F. E., Boswell, M., Brudanin, V., Busch, M., Caldwell, A. S., Chan, Y.-D., Christofferson, C. D., Combs, D. C., Cuesta, C., Detwiler, J. A., Doe, P. J., Efremenko, Yu., Egorov, V., Ejiri, H., and Elliott, S. R.

Subjects
GERMANIUM detectors, NEUTRINOLESS double beta decay, NEUTRINO mass, PARTICLES (Nuclear physics), NUCLEAR research
Abstract

The MAJORANA DEMONSTRATOR is being constructed at the Sanford Underground Research Facility (SURF) in Lead, SD, by the MAJORANA Collaboration to demonstrate the feasibility of a tonne-scale neutrinoless double-beta decay experiment based on 76Ge. The observation of neutrinoless double-beta decay would indicate that neutrinos can serve as their own antiparticles, thus proving neutrinos to be Majorana particles, and would give information on neutrino masses. Attaining sensitivities for neutrino masses in the inverted hierarchy region requires large tonne-scale detectors with extremely low backgrounds. The DEMONSTRATOR project will show that sufficiently low backgrounds are achievable. A brief description of the detector and a status update on the construction is given, including the work done at BHSU on acid-etching of Pb shielding bricks. [ABSTRACT FROM AUTHOR]

Published
2013

29. A search for bremsstrahlung solar axions using the Majorana low-background BEGe detector at Kimballton (MALBEK)

Author

Abgrall, N., Aguayo, E., Avignone, F. T., Barabash, A. S., Bertrand, F. E., Boswell, M., Brudanin, V., Busch, M., Caldwell, A. S., Chan, Y-D, Christofferson, C. D., Combs, D. C., Cooper, R. J., Creswick, R. J., Detwiler, J. A., Doe, P. J., Efremenko, Yu, Egorov, V., Elliott, S. R., Fast, J. E., Finnerty, P., Giovanetti, G. K., Goett, J., Green, M. P., Gruszko, J., Guiseppe, V. E., Gusev, K., Hegai, A., Henning, R., Hoppe, E. W., Howard, S., Howe, M. A., Keeter, K. J., Kidd, M. F., Knecht, A., Kochetov, O., Konovalov, S. I., Kouzes, R. T., Laferriere, B. D., Leon, J., Leviner, L. E., Loach, J. C., Macmullin, J., Macmullin, S., Marino, M. G., Martin, R. D., Mertens, S., Orrell, J. L., O Shaughnessy, C., Overman, N. R., Phillips, D. G., Alan Poon, Pushkin, K., Radford, D. C., Robertson, R. G. H., Ronquest, M. C., Schubert, A. G., Shanks, B., Shirchenko, M., Snavely, K. J., Snyder, N., Steele, D., Suriano, A. M., Thompson, J., Timkin, V., Varner, R. L., Vasilyev, S., Vetter, K., Vorren, K., White, B. R., Wilkerson, J. F., Xu, W., Yakushev, E., Young, A. R., Yu, C. H., and Yumatov, V.

30. The Majorana double beta decay experiment: Present status

Author

Aguayo, E., Avignone Iii, F. T., Back, H. O., Barabash, A. S., Beene, J. R., Bergevin, M., Bertrand, F. E., Boswell, M., Brudanin, V., Busch, M., Chan, Y-D, Christofferson, C. D., Collar, J. I., Combs, D. C., Cooper, R. J., Detwiler, J. A., Doe, P. J., Efremenko, Y., Egorov, V., Ejiri, H., Elliott, S. R., Esterline, J., Fast, J. E., Fields, N., Finnerty, P., Fraenkle, F. M., Gehman, V. M., Giovanetti, G. K., Green, M. P., Guiseppe, V. E., Gusey, K., Hallin, A. L., Hazama, R., Henning, R., Hime, A., Hoppe, E. W., Horton, M., Howard, S., Howe, M. A., Johnson, R. A., Keeter, K. J., Keller, C., Kidd, M. F., Knecht, A., Kochetov, O., Konovalov, S. I., Kouzes, R. T., Laferriere, B. D., Laroque, B. H., Leon, J., Leviner, L. E., Loach, J. C., Macmullin, S., Michael Marino, Martin, R. D., Mei, D. -M, Merriman, J. H., Miller, M. L., Mizouni, L., Nomachi, M., Orrell, J. L., Overman, N. R., Phillips Ii, D. G., Poon, A. W. P., Perumpilly, G., Prior, G., Radford, D. C., Rielage, K., Robertson, R. G. H., Ronquest, M. C., Schubert, A. G., Shima, T., Shirchenko, M., Snavely, K. J., Steele, D., Strain, J., Thomas, K., Timkin, V., Tornow, W., Vanyushin, I., Varner, R. L., Vetter, K., Vorren, K., Wilkerson, J. F., Yakushev, E., Young, A. R., Yu, C. -H, Yumatov, V. I., and Zhang, C.

31. The majorana demonstrator

Author

Aguayo, E., Fast, J. E., Hoppe, E. W., Keillor, M. E., Kephart, J. D., Kouzes, R. T., Laferriere, B. D., Merriman, J., Orrell, J. L., Overman, N. R., Avignone, F. T., Back, H. O., Combs, D. C., Leviner, L. E., Young, A. R., Barabash, A. S., Konovalov, S. I., Vanyushin, I., Yumatov, V., Marc Bergevin, Chan, Y. -D, Detwiler, J. A., Loach, J. C., Martin, R. D., Poon, A. W. P., Prior, G., Vetter, K., Bertrand, F. E., Cooper, R. J., Radford, D. C., Varner, R. L., Yu, C. -H, Boswell, M., Elliott, S. R., Gehman, V. M., Hime, A., Kidd, M. F., Laroque, B. H., Rielage, K., Ronquest, M. C., Steele, D., Brudanin, V., Egorov, V., Gusey, K., Kochetov, O., Shirchenko, M., Timkin, V., Yakushev, E., Busch, M., Esterline, J., Tornow, W., Christofferson, C. D., Horton, M., Howard, S., Sobolev, V., Collar, J. I., Fields, N., Creswick, R. J., Doe, P. J., Johnson, R. A., Knecht, A., Leon, J., Marino, M. G., Miller, M. L., Robertson, R. G. H., Schubert, A. G., Wolfe, B. A., Efremenko, Yu, Ejiri, H., Hazama, R., Nomachi, M., Shima, T., Finnerty, P., Fraenkle, F. M., Giovanetti, G. K., Green, M. P., Henning, R., Howe, M. A., Macmullin, S., Phillips, D. G., Snavely, K. J., Strain, J., Vorren, K., Guiseppe, V. E., Keller, C., Mei, D. -M, Perumpilly, G., Thomas, K., Zhang, C., Hallin, A. L., Keeter, K. J., Mizouni, L., and Wilkerson, J. F.

Subjects
FOS: Physical sciences, High Energy Physics::Experiment, Nuclear Experiment (nucl-ex), Nuclear Experiment
Abstract

A brief review of the history and neutrino physics of double beta decay is given. A description of the MAJORANA DEMONSTRATOR research and development program including background reduction techniques is presented in some detail. The application of point contact (PC) detectors to the experiment is discussed, including the effectiveness of pulse shape analysis. The predicted sensitivity of a PC detector array enriched to 86% in 76Ge is given., Comment: To be published in the DPF-2011 Conference Proceedings

32. Measurement of the 209Bi(n,4n) 206Bi and 169Tm(n,3n) 167Tm cross sections between 23.5 and 30.5 MeV relevant to reaction-in-flight neutron studies at the National Ignition Facility.

Author

Gooden, M. E., Bredeweg, T. A., Champine, B., Combs, D. C., Finch, S., Hayes-Sterbenz, A., Henry, E., Krishichayan, Rundberg, R., Tornow, W., Wilhelmy, J., and Yeamans, C.

Subjects
*BISMUTH compounds, *THULIUM, *VAN de Graaff generator
Abstract

At the National Ignition Facility, experiments are being performed to measure charged-particle stopping powers in the previously unexplored warm dense plasma regime. These measurements are done using reaction-in-flight (RIF) neutrons from an inertial confinement fusion system. RIF neutrons are produced with a continuum of energies up to 30 MeV. By making activation measurements utilizing threshold reactions for neutrons in the energy range of 15 < En < 30 MeV, the number of RIF neutrons can be determined and from this the stopping power of the deuterium and tritium ions that produced the RIF neutrons can be inferred. Currently, the 169Tm(n,3n) 167Tm reaction has been used. However, in an effort to provide a secondary complimentary measurement, efforts are underway to make use of the 209Bi(n,4n) 206Bi reaction, with a threshold of 22.5 MeV. The cross sections were measured at the 10 MV tandem Van De Graaff accelerator at the Triangle Universities Nuclear Laboratory with quasimonoenergetic neutrons between 23.5 and 30.5 MeV, where few previous measurements have been made. Cross-section data are compared to calculations and other available measurements. [ABSTRACT FROM AUTHOR]

Published
2017
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33. 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&#95;{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&#95;{-2.5}^{+3.1}  counts/(FWHM t yr).

Published
2018
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