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18 results on '"Chan, Y-D."'

1. Modeling backgrounds for the Majorana Demonstrator

Author

Haufe, CR, Arnquist, IJ, Avignone, FT, Barabash, AS, Barton, CJ, Bhimani, KH, Blalock, E, Bos, B, Busch, M, Buuck, M, Caldwell, TS, Chan, Y-D, Christofferson, CD, Chu, P-H, Clark, ML, Cuesta, C, Detwiler, JA, Efremenko, Yu, Ejiri, H, Elliott, SR, Giovanetti, GK, Green, MP, Gruszko, J, Guinn, IS, Guiseppe, VE, Henning, R, Aguilar, D Hervas, Hoppe, EW, Hostiuc, A, Kidd, MF, Kim, I, Kouzes, RT, V., TE Lannen, Li, A, Lopez, AM, López-Castaño, JM, Martin, EL, Martin, RD, Massarczyk, R, Meijer, SJ, Oli, TK, Othman, G, Paudel, LS, Pettus, W, Poon, AWP, Radford, DC, Reine, AL, Rielage, K, Ruof, NW, Schaper, DC, Tedeschi, D, Varner, RL, Vasilyev, S, Wilkerson, JF, Wiseman, C, Xu, W, Yu, C-H, and Zhu, BX

Subjects
Nuclear and Plasma Physics, Particle and High Energy Physics, Physical Sciences
Abstract

The MAJORANA DEMONSTRATOR is a neutrinoless double-beta decay (0νββ) experiment containing ~30 kg of p-type point-contact germanium detectors enriched to 88% in 76Ge and ~14 kg of natural germanium detectors. The detectors are housed in two electroformed copper cryostats and surrounded by a graded passive shield with an active muon veto. An extensive radioassay campaign was performed prior to installation to insure the use of ultra-clean materials. The DEMONSTRATOR achieved one of the lowest background rates in the region of the 0νββ Q-value, 15.7±1.4 cts/(FWHM t y) from the low-background configuration spanning most of the 64.5 kg-yr active exposure. Nevertheless this background rate is a factor of five higher than the projected background rate. This discrepancy arises from an excess of events from the 232Th decay chain. Background-model fits aim to explain the deviation from assay-based projections, potentially determine the source(s) of observed backgrounds, and allow a precise measurement of the two-neutrino double-beta decay half-life. The fits agree with earlier simulation studies, which indicate the origin of the 232Th excess is not from a near-detector component and have informed design decisions for the next-generation LEGEND experiment. Recent findings have narrowed the suspected locations for the excess activity, motivating a final simulation and assay campaign to complete the background model.

Published
2023

2. Recent results of the Majorana Demonstrator experiment

Author

López-Castaño, JM, Alvis, SI, Arnquist, IJ, Avignone, FT, Barabash, AS, Barton, CJ, Basu, V, Bertrand, FE, Bos, B, Brudanin, V, Busch, M, Buuck, M, Caldwell, TS, Chan, Y-D, Christofferson, CD, Chu, P-H, Clark, ML, Cuesta, C, Detwiler, JA, Drobizhev, A, Edwins, DW, Efremenko, Yu, Ejiri, H, Elliott, SR, Gilliss, T, Giovanetti, GK, Green, MP, Gruszko, J, Guinn, IS, Guiseppe, VE, Haufe, CR, Hegedus, RJ, Henning, R, Aguilar, D Hervas, Hoppe, EW, Hostiuc, A, Howe, MA, Keeter, KJ, Kidd, MF, Konovalov, SI, Kouzes, RT, Lopez, AM, Martin, E, Martin, RD, Massarczyk, R, Meijer, SJ, Mertens, S, Myslik, J, Oli, TK, Othman, G, Pettus, W, Piliounis, A, Poon, AWP, Radford, DC, Rager, J, Reine, AL, Rielage, K, Ruof, NW, Shanks, B, Shirchenko, M, Tedeschi, D, Varner, RL, Vasilyev, S, White, BR, Wilkerson, JF, Wiseman, C, Xu, W, Yakushev, E, Yu, C-H, Yumatov, V, Zhitnikov, I, and Zhu, BX

Subjects
Nuclear and Plasma Physics, Particle and High Energy Physics, Physical Sciences
Abstract

The Majorana Demonstrator is searching for neutrinoless double-beta decay in 76Ge with two modular arrays of natural and 76Ge-enriched germanium detectors. It is located at the 4850' level of Sanford Underground Research Facility in Lead, South Dakota, USA, and its total mass of germanium detectors is 44.1 kg, of which 29.7 kg is enriched. The analysis of the first 26 kg-yr of data provides an unprecedented energy resolution of 0.13% in the region of interest at 2039 keV and a background level of 15.4 ±2.0 counts/(FWHM t yr). It establishes the lower limit of the half-life of neutrinoless double beta decay as 2.7 1025 yr in 76Ge at 90% CL. This analysis will be summarized here with an emphasis on the energy determination.

Published
2019

3. Contamination control and assay results for the Majorana Demonstrator ultra clean components

Author

Christofferson, CD, Abgrall, N, Alvis, SI, Arnquist, IJ, Avignone, FT, Barabash, AS, Barton, CJ, Bertrand, FE, Bode, T, Bradley, AW, Brudanin, V, Busch, M, Buuck, M, Caldwell, TS, Chan, Y-D, Chu, P-H, Cuesta, C, Detwiler, JA, Dunagan, C, Efremenko, Yu, Ejiri, H, Elliott, SR, Gilliss, T, Giovanetti, GK, Green, MP, Gruszko, J, Guinn, IS, Guiseppe, VE, Haufe, CR, Hehn, L, Henning, R, Hoppe, EW, Howe, MA, Keeter, KJ, Kidd, MF, Konovalov, SI, Kouzes, RT, Lopez, AM, Martin, RD, Massarczyk, R, Meijer, SJ, Mertens, S, Myslik, J, O’Shaughnessy, C, Othman, G, Poon, AWP, Radford, DC, Rager, J, Reine, AL, Rielage, K, Robertson, RGH, Rouf, NW, Shanks, B, Shirchenko, M, Suriano, AM, Tedeschi, D, Trimble, JE, Varner, RL, Vasilyev, S, Vetter, K, Vorren, K, White, BR, Wilkerson, JF, Wiseman, C, Xu, W, Yakushev, E, Yu, C-H, Yumatov, V, Zhitnikov, I, and Zhu, BX

Subjects
Nuclear and Plasma Physics, Physical Sciences, physics.ins-det, nucl-ex
Abstract

The Majorana Demonstrator is a neutrinoless double beta decay experiment utilizing enriched Ge-76 detectors in 2 separate modules inside of a common solid shield at the Sanford Underground Research Facility. The Demonstrator has utilized world leading assay sensitivities to develop clean materials and processes for producing ultra-pure copper and plastic components. This experiment is now operating, and initial data provide new insights into the success of cleaning and processing. Post production copper assays after the completion of Module 1 showed an increase in U and Th contamination in finished parts compared to starting bulk material. A revised cleaning method and additional round of surface contamination studies prior to Module 2 construction have provided evidence that more rigorous process control can reduce surface contamination. This article describes the assay results and discuss further studies to take advantage of assay capabilities for the purpose of maintaining ultra clean fabrication and process design.

Published
2018

4. Low background materials and fabrication techniques for cables and connectors in the Majorana Demonstrator

Author

Busch, M, Abgrall, N, Alvis, SI, Arnquist, IJ, Avignone, FT, Barabash, AS, Barton, CJ, Bertrand, FE, Bode, T, Bradley, AW, Brudanin, V, Buuck, M, Caldwell, TS, Chan, Y-D, Christofferson, CD, Chu, P-H, Cuesta, C, Detwiler, JA, Dunagan, C, Efremenko, Yu, Ejiri, H, Elliott, SR, Gilliss, T, Giovanetti, GK, Green, MP, Gruszko, J, Guinn, IS, Guiseppe, VE, Haufe, CR, Hehn, L, Henning, R, Hoppe, EW, Howe, MA, Keeter, KJ, Kidd, MF, Konovalov, SI, Kouzes, RT, Lopez, AM, Martin, RD, Massarczyk, R, Meijer, SJ, Mertens, S, Myslik, J, O’Shaughnessy, C, Othman, G, Poon, AWP, Radford, DC, Rager, J, Reine, AL, Rielage, K, Robertson, RGH, Rouf, NW, Shanks, B, Shirchenko, M, Suriano, AM, Tedeschi, D, Trimble, JE, Varner, RL, Vasilyev, S, Vetter, K, Vorren, K, White, BR, Wilkerson, JF, Wiseman, C, Xu, W, Yakushev, E, Yu, C-H, Yumatov, V, Zhitnikov, I, and Zhu, BX

Subjects
Nuclear and Plasma Physics, Particle and High Energy Physics, Synchrotrons and Accelerators, Physical Sciences, physics.ins-det
Abstract

The Majorana Collaboration is searching for the neutrinoless double-beta decay of the nucleus 76Ge. The Majorana Demonstrator is an array of germanium detectors deployed with the aim of implementing background reduction techniques suitable for a tonne scale 76Ge-based search (the LEGEND collaboration). In the Demonstrator, germanium detectors operate in an ultra-pure vacuum cryostat at 80 K. One special challenge of an ultra-pure environment is to develop reliable cables, connectors, and electronics that do not significantly contribute to the radioactive background of the experiment. This paper highlights the experimental requirements and how these requirements were met for the Majorana Demonstrator, including plans to upgrade the wiring for higher reliability in the summer of 2018. Also described are requirements for LEGEND R&D efforts underway to meet these additional requirements.

Published
2018

5. The large enriched germanium experiment for neutrinoless double beta decay (LEGEND)

Author

Abgrall, N, Abramov, A, Abrosimov, N, Abt, I, Agostini, M, Agartioglu, M, Ajjaq, A, Alvis, SI, Avignone, FT, Bai, X, Balata, M, Barabanov, I, Barabash, AS, Barton, PJ, Baudis, L, Bezrukov, L, Bode, T, Bolozdynya, A, Borowicz, D, Boston, A, Boston, H, Boyd, STP, Breier, R, Brudanin, V, Brugnera, R, Busch, M, Buuck, M, Caldwell, A, Caldwell, TS, Camellato, T, Carpenter, M, Cattadori, C, Cederkäll, J, Chan, Y-D, Chen, S, Chernogorov, A, Christofferson, CD, Chu, P-H, Cooper, RJ, Cuesta, C, Demidova, EV, Deng, Z, Deniz, M, Detwiler, JA, Di Marco, N, Domula, A, Du, Q, Efremenko, Yu, Egorov, V, Elliott, SR, Fields, D, Fischer, F, Galindo-Uribarri, A, Gangapshev, A, Garfagnini, A, Gilliss, T, Giordano, M, Giovanetti, GK, Gold, M, Golubev, P, Gooch, C, Grabmayr, P, Green, MP, Gruszko, J, Guinn, IS, Guiseppe, VE, Gurentsov, V, Gurov, Y, Gusev, K, Hakenmüeller, J, Harkness-Brennan, L, Harvey, ZR, Haufe, CR, Hauertmann, L, Heglund, D, Hehn, L, Heinz, A, Hiller, R, Hinton, J, Hodak, R, Hofmann, W, Howard, S, Howe, MA, Hult, M, Inzhechik, LV, Csáthy, J Janicskó, Janssens, R, Ješkovský, M, Jochum, J, Johansson, HT, Judson, D, Junker, M, Kaizer, J, Kang, K, Kazalov, V, Kermadic, Y, Kiessling, F, Kirsch, A, Kish, A, and Klimenko, A

Subjects
Nuclear and Plasma Physics, Particle and High Energy Physics, Physical Sciences, physics.ins-det, hep-ex, nucl-ex
Abstract

The observation of neutrinoless double-beta decay (0νββ) would show that lepton number is violated, reveal that neu-trinos are Majorana particles, and provide information on neutrino mass. A discovery-capable experiment covering the inverted ordering region, with effective Majorana neutrino masses of 15 - 50 meV, will require a tonne-scale experiment with excellent energy resolution and extremely low backgrounds, at the level of ∼0.1 count /(FWHM·t·yr) in the region of the signal. The current generation 76Ge experiments GERDA and the Majorana Demonstrator, utilizing high purity Germanium detectors with an intrinsic energy resolution of 0.12%, have achieved the lowest backgrounds by over an order of magnitude in the 0νββ signal region of all 0νββ experiments. Building on this success, the LEGEND collaboration has been formed to pursue a tonne-scale 76Ge experiment. The collaboration aims to develop a phased 0νββ experimental program with discovery potential at a half-life approaching or at 1028 years, using existing resources as appropriate to expedite physics results.

Published
2017

6. The status and initial results of the Majorana demonstrator experiment

Author

Guiseppe, VE, Abgrall, N, Alvis, SI, Arnquist, IJ, Avignone, FT, Barabash, AS, Barton, CJ, Bertrand, FE, Bode, T, Bradley, AW, Brudanin, V, Busch, M, Buuck, M, Caldwell, TS, Chan, Y-D, Christofferson, CD, Chu, P-H, Cuesta, C, Detwiler, JA, Dunagan, C, Efremenko, Yu, Ejiri, H, Elliott, SR, Gilliss, T, Giovanetti, GK, Green, MP, Gruszko, J, Guinn, IS, Haufe, CR, Hehn, L, Henning, R, Hoppe, EW, Howe, MA, Keeter, KJ, Kidd, MF, Konovalov, SI, Kouzes, RT, Lopez, AM, Martin, RD, Massarczyk, R, Meijer, SJ, Mertens, S, Myslik, J, O’Shaughnessy, C, Othman, G, Poon, AWP, Radford, DC, Rager, J, Reine, AL, Rielage, K, Robertson, RGH, Rouf, NW, Shanks, B, Shirchenko, M, Suriano, AM, Tedeschi, D, Trimble, JE, Varner, RL, Vasilyev, S, Vetter, K, Vorren, K, White, BR, Wilkerson, JF, Wiseman, C, Xu, W, Yakushev, E, Yu, C-H, Yumatov, V, Zhitnikov, I, and Zhu, BX

Subjects
Nuclear and Plasma Physics, Particle and High Energy Physics, Physical Sciences, physics.ins-det, nucl-ex
Abstract

Neutrinoless double-beta decay searches play a major role in determining the nature of neutrinos, the existence of a lepton violating process, and the effective Majorana neutrino mass. The Majorana Collaboration assembled an array of high purity Ge detectors to search for neutrinoless double-beta decay in 76Ge. The Majorana Demonstrator is comprised of 44.1 kg (29.7 kg enriched in 76Ge) of Ge detectors divided between two modules contained in a low-background shield at the Sanford Underground Research Facility in Lead, South Dakota, USA. The initial goals of the Demonstrator are to establish the required background and scalability of a Ge-based next-generation ton-scale experiment. Following a commissioning run that started in 2015, the first detector module started low-background data production in early 2016. The second detector module was added in August 2016 to begin operation of the entire array. We discuss results of the initial physics runs, as well as the status and physics reach of the full Majorana Demonstrator experiment.

Published
2017

7. Status of the Majorana Demonstrator

Author

Cuesta, C, Abgrall, N, Arnquist, IJ, Avignone, FT, Baldenegro-Barrera, CX, Barabash, AS, Bertrand, FE, Bradley, AW, Brudanin, V, Busch, M, Buuck, M, Byram, D, Caldwell, AS, Chan, Y-D, Christofferson, CD, Chu, P-H, Detwiler, JA, Efremenko, Yu, Ejiri, H, Elliott, SR, Galindo-Uribarri, A, Gilliss, T, Giovanetti, GK, Goett, J, Green, MP, Gruszko, J, Guinn, IS, Guiseppe, VE, Henning, R, Hoppe, EW, Howard, S, Howe, MA, Jasinski, BR, Keeter, KJ, Kidd, MF, Konovalov, SI, Kouzes, RT, LaFerriere, BD, Leon, J, MacMullin, J, Martin, RD, Massarczyk, R, Meijer, SJ, Mertens, S, Orrell, JL, O’Shaughnessy, C, Poon, AWP, Radford, DC, Rager, J, Rielage, K, Robertson, RGH, Romero-Romero, E, Shanks, B, Shirchenko, M, Snyder, N, Suriano, AM, Tedeschi, D, Trimble, JE, Varner, RL, Vasilyev, S, Vetter, K, Vorren, K, White, BR, Wilkerson, JF, Wiseman, C, Xu, W, Yakushev, E, Yu, C-H, Yumatov, V, and Zhitnikov, I

Subjects
Nuclear and Plasma Physics, Particle and High Energy Physics, Physical Sciences, neutrinoless double-beta decay, germanium detector, Majorana neutrino mass, physics.ins-det, nucl-ex
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 76Ge. 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.

Published
2015

8. Low Background Materials and Fabrication Techniques for Cables and Connectors in the MAJORANA DEMONSTRATOR.

Author

Busch, M., Abgrall, N., Alvis, S. I., Arnquist, I. J., Avignone III, F. T., Barabash, A. S., Barton, C. J., Bertrand, F. E., Bode, T., Bradley, A. W., Brudanin, V., Buuck, M., Caldwell, T. S., Chan, Y.-D., Christofferson, C. D., Chu, P.-H., Cuesta, C., Detwiler, J. A., Dunagan, C., and Efremenko, Yu.

Subjects
NEUTRINOLESS double beta decay, GERMANIUM detectors, CABLE manufacturing, ELECTRIC connectors, CABLES
Abstract

The MAJORANA COLLABORATION is searching for the neutrinoless double-beta decay of the nucleus 76Ge. The Majorana Demonstrator is an array of germanium detectors deployed with the aim of implementing background reduction techniques suitable for a tonne scale 76Ge-based search (the LEGEND collaboration). In the DEMONSTRATOR, germanium detectors operate in an ultra-pure vacuum cryostat at 80 K. One special challenge of an ultra-pure environment is to develop reliable cables, connectors, and electronics that do not significantly contribute to the radioactive background of the experiment. This paper highlights the experimental requirements and how these requirements were met for the MAJORANA DEMONSTRATOR, including plans to upgrade the wiring for higher reliability in the summer of 2018. Also described are requirements for LEGEND R&D efforts underway to meet these additional requirements. [ABSTRACT FROM AUTHOR]

Published
2017
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9. Contamination Control and Assay Results for the MAJORANA DEMONSTRATOR Ultra Clean Components.

Author

Christofferson, C. D., Abgrall, N., Alvis, S. I., Arnquist, I. J., Avignone III, F. T., Barabash, A. S., Barton, C. J., Bertrand, F. E., Bode, T., Bradley, A. W., Brudanin, V., Busch, M., Buuck, M., Caldwell, T. S., Chan, Y.-D., Chu, P.-H., Cuesta, C., Detwiler, J. A., Dunagan, C., and Efremenko, Yu.

Subjects
NEUTRINOLESS double beta decay, GERMANIUM detectors, SURFACE contamination, CLEANING, FABRICATION (Manufacturing), PREVENTION
Abstract

The MAJORANA DEMONSTRATOR is a neutrinoless double beta decay experiment utilizing enriched Ge-76 detectors in 2 separate modules inside of a common solid shield at the Sanford Underground Research Facility. THE DEMONSTRATOR has utilized world leading assay sensitivities to develop clean materials and processes for producing ultra-pure copper and plastic components. This experiment is now operating, and initial data provide new insights into the success of cleaning and processing. Post production copper assays after the completion of Module 1 showed an increase in U and Th contamination in finished parts compared to starting bulk material. A revised cleaning method and additional round of surface contamination studies prior to Module 2 construction have provided evidence that more rigorous process control can reduce surface contamination. This article describes the assay results and discuss further studies to take advantage of assay capabilities for the purpose of maintaining ultra clean fabrication and process design. [ABSTRACT FROM AUTHOR]

Published
2017
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10. Low background signal readout electronics for the MAJORANA DEMONSTRATOR

Author

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

Published
2015
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11. 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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12. Analysis techniques for background rejection at the MAJORANA DEMONSTRATOR.

Author

Cuesta, C., Abgrall, N., Arnquist, I. J., Avignone III, F. T., Baldenegrom-Barrera, C. X., Barabash, A. S., Bertrand, F. E., Bradley, A. W., Brudaning, V., Busch, M., Buuck, M., Byram, D., Caldwell, A. S., Chan, Y-D., Christofferson, C. D., Detwiler, J. A., Efremenko, Yu., Ejiri, H., Elliott, S. R., and Galindo-Uribarri, A.

Subjects
DOUBLE beta decay, GERMANIUM radiation detectors, NEUTRINOLESS double beta decay, NEUTRINO mass, GERMANIUM detectors
Abstract

The MAJORANA Collaboration is constructing the MAJORANA DEMONSTRATOR, an ultra-low background, 40- kg modular HPGe detector array to search for neutrinoless double beta decay in 76Ge. In view of the next generation of tonne-scale Ge-based 0νβ β-decay searches that will probe the neutrino mass scale in the inverted-hierarchy region, a major goal of the MAJORANA 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 background rejection techniques to be applied to the data include cuts based on data reduction, pulse shape analysis, event coincidences, and time correlations. The Point Contact design of the DEMONSTRATOR's germanium detectors allows for significant reduction of gamma background. [ABSTRACT FROM AUTHOR]

Published
2015
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13. Berkeley Low Background Facility.

Author

Thomas, K. J., Smith, A. R., Poon, A. W. P, Chan, Y. D., Norman, E. B., and Lesko, K. T.

Subjects
GAMMA rays, RADIOISOTOPES, COSMOGENIC nuclides, ASTRONOMICAL observations
Abstract

The Berkeley Low Background Facility (BLBF) at Lawrence Berkeley National Laboratory (LBNL) in Berkeley, California provides low background gamma spectroscopy services to a wide array of experiments and projects. The analysis of samples takes place within two unique facilities; locally within a carefully-constructed, low background laboratory on the surface at LBNL and at the Sanford Underground Research Facility (SURF) in Lead, SD. These facilities provide a variety of gamma spectroscopy services to low background experiments primarily in the form of passive material screening for primordial radioisotopes (U, Th, K) or common cosmogenic/anthropogenic products; active screening via neutron activation analysis for U,Th, and K as well as a variety of stable isotopes; and neutron flux/beam characterization measurements through the use of monitors. A general overview of the facilities, services, and sensitivities will be presented. Recent activities and upgrades will also be described including an overview of the recently installed counting system at SURF (recently relocated from Oroville, CA in 2014), the installation of a second underground counting station at SURF in 2015, and future plans. The BLBF is open to any users for counting services or collaboration on a wide variety of experiments and projects. [ABSTRACT FROM AUTHOR]

Published
2015
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14. 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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15. 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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16. Low background counting at the LBNL low background facility.

Author

Thomas, K. J., Smith, A. R., Chan, Y. D., Norman, E. B., Wang, B. S., and Hurley, D. L.

Subjects
GAMMA ray spectroscopy, NUCLEAR activation analysis, GERMANIUM radiation detectors, RADON, MUONS, RADIOISOTOPES, SCINTILLATORS, TRACE element analysis
Abstract

The Low Background Facility (LBF) at the Lawrence Berkeley National Laboratory (LBNL) in Berkeley, California provides low background gamma spectroscopy services to end-users in two unique facilities: locally within a carefully-constructed, low background laboratory space; and a satellite underground station (600 m.w.e) in Oroville, CA. These facilities provide a variety of gamma spectroscopy services to low background experiments primarily in the form of passive material screening for primordial radioisotopes (U, Th, K) or common cosmogenic and anthropogenic products, as well as active screening via neutron activation analysis for specific applications. A general overview of the facilities, services, and capabilities will be discussed. Recent activities will also be presented, including the recent installation of a 3π muon veto at the surface facility, cosmogenic activation studies of TeO2 for CUORE, and environmental monitoring of Fukushima fallout. [ABSTRACT FROM AUTHOR]

Published
2013
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17. The MAJORANA DEMONSTRATOR: An R&D project towards a tonne-scale germanium neutrinoless double-beta decay search.

Author

Aalseth, C. E., Amman, M., Amsbaugh, J. F., Avignone, III, F. T., Back, H. O., Barabash, A. S., Barbeau, P. S., Beene, J. R., Bergevin, M., Bertrand, F. E., Boswell, M., Brudanin, V., Bugg, W., Burritt, T. H., Chan, Y.-D., Collar, J. I., Cooper, R. J., Creswick, R., Detwiler, J. A., and Doe, P. J.

Subjects
ORIGANUM, BETA decay, RADIOACTIVE decay, INTERSTELLAR medium, GERMANIUM diodes
Abstract

The MAJORANA collaboration is pursuing the development of the so-called MAJORANA DEMONSTRATOR. The DEMONSTRATOR is intended to perform research and development towards a tonne-scale germanium-based experiment to search for the neutrinoless double-beta decay of 76Ge. The DEMONSTRATOR can also perform a competitive direct dark matter search for light WIMPs in the 1–10 GeV/c2 mass range. It will consist of approximately 60 kg of germanium detectors in an ultra-low background shield located deep underground at the Sanford Underground Laboratory in Lead, SD. The DEMONSTRATOR will also perform background and technology studies, and half of the detector mass will be enriched germanium. This talk will review the motivation, design, technology and status of the Demonstrator. [ABSTRACT FROM AUTHOR]

Published
2009
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18. Search for strange matter via heavy ion activation.

Author

Perillo Isaac, M. C., Chan, Y. D., Clark, R., Deleplanque, M. A., Dragowsky, M. R., Fallon, P., Goldman, I. D., Nishiizumi, K., Larimer, R-M., Lee, I. Y., Macchiavelli, A. O., MacLeod, R. W., Norman, E. B., Schroeder, L. S., and Stephens, F. S.

Published
1997
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