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1. The Majorana Demonstrator readout electronics system

Author: Abgrall, N, Abgrall, N, Amman, M, Arnquist, IJ, Avignone, FT, Barabash, AS, Barton, CJ, Barton, PJ, Bertrand, FE, Bhimani, KH, Bos, B, Bradley, AW, Burritt, TH, Busch, M, Buuck, M, Caldwell, TS, Chan, YD, Christofferson, CD, Chu, PH, Clark, ML, Cooper, RJ, Cuesta, C, Detwiler, JA, Drobizhev, A, Edwins, DW, Efremenko, Y, Ejiri, H, Elliott, SR, Gilliss, T, Giovanetti, GK, Green, MP, Gruszko, J, Guinn, IS, Guiseppe, VE, Haufe, CR, Hegedus, RJ, Henning, R, Hervas Aguilar, D, Hoppe, EW, Hostiuc, A, Kidd, MF, Kim, I, Kouzes, RT, Li, A, Loach, JC, Lopez, AM, López-Castaño, JM, Luke, PN, Martin, EL, Martin, RD, Massarczyk, R, Meijer, SJ, Mertens, S, Myslik, J, Oli, TK, Othman, G, Peterson, D, Pettus, W, Poon, AWP, Radford, DC, Rager, J, Reine, AL, Rielage, K, Robertson, RGH, Ruof, NW, Sayki, B, Stortini, MJ, Tedeschi, D, Turqueti, M, Van Wechel, TD, Varner, RL, Vasilyev, S, Vetter, K, Wilkerson, JF, Wiseman, C, Xu, W, Yaver, H, Yu, CH, Zhu, BX, Zimmermann, S, Abgrall, N, Abgrall, N, Amman, M, Arnquist, IJ, Avignone, FT, Barabash, AS, Barton, CJ, Barton, PJ, Bertrand, FE, Bhimani, KH, Bos, B, Bradley, AW, Burritt, TH, Busch, M, Buuck, M, Caldwell, TS, Chan, YD, Christofferson, CD, Chu, PH, Clark, ML, Cooper, RJ, Cuesta, C, Detwiler, JA, Drobizhev, A, Edwins, DW, Efremenko, Y, Ejiri, H, Elliott, SR, Gilliss, T, Giovanetti, GK, Green, MP, Gruszko, J, Guinn, IS, Guiseppe, VE, Haufe, CR, Hegedus, RJ, Henning, R, Hervas Aguilar, D, Hoppe, EW, Hostiuc, A, Kidd, MF, Kim, I, Kouzes, RT, Li, A, Loach, JC, Lopez, AM, López-Castaño, JM, Luke, PN, Martin, EL, Martin, RD, Massarczyk, R, Meijer, SJ, Mertens, S, Myslik, J, Oli, TK, Othman, G, Peterson, D, Pettus, W, Poon, AWP, Radford, DC, Rager, J, Reine, AL, Rielage, K, Robertson, RGH, Ruof, NW, Sayki, B, Stortini, MJ, Tedeschi, D, Turqueti, M, Van Wechel, TD, Varner, RL, Vasilyev, S, Vetter, K, Wilkerson, JF, Wiseman, C, Xu, W, Yaver, H, Yu, CH, Zhu, BX, and Zimmermann, S
Abstract: The Majorana Demonstrator comprises two arrays of high-purity germanium detectors constructed to search for neutrinoless double-beta decay in 76Ge and other physics beyond the Standard Model. Its readout electronics were designed to have low electronic noise, and radioactive backgrounds were minimized by using low-mass components and low-radioactivity materials near the detectors. This paper provides a description of all components of the Majorana Demonstrator readout electronics, spanning the front-end electronics and internal cabling, back-end electronics, digitizer, and power supplies, along with the grounding scheme. The spectroscopic performance achieved with these readout electronics is also demonstrated.
Published: 2022

2. Signatures of muonic activation in the Majorana Demonstrator

Author: Arnquist, IJ, Arnquist, IJ, Avignone, FT, Barabash, AS, Barton, CJ, Bertrand, FE, Blalock, E, Bos, B, Busch, M, Buuck, M, Caldwell, TS, Chan, YD, Christofferson, CD, Chu, PH, Clark, ML, Cuesta, C, Detwiler, JA, Edwards, TR, Efremenko, Y, Ejiri, H, Elliott, SR, Giovanetti, GK, Green, MP, Gruszko, J, Guinn, IS, Guiseppe, VE, Haufe, CR, Henning, R, Hervas Aguilar, D, Hoppe, EW, Hostiuc, A, Kidd, MF, Kim, I, Kouzes, RT, Lannen, TEV, Lopez, AM, López-Castaño, JM, Martin, EL, Martin, RD, Massarczyk, R, Meijer, SJ, Mertens, S, Oli, TK, Othman, G, Paudel, LS, Pettus, W, Poon, AWP, Radford, DC, Reine, AL, Rielage, K, Ruof, NW, Tedeschi, D, Varner, RL, Vasilyev, S, Wilkerson, JF, Wiseman, C, Xu, W, Yu, CH, Zhu, BX, Arnquist, IJ, Arnquist, IJ, Avignone, FT, Barabash, AS, Barton, CJ, Bertrand, FE, Blalock, E, Bos, B, Busch, M, Buuck, M, Caldwell, TS, Chan, YD, Christofferson, CD, Chu, PH, Clark, ML, Cuesta, C, Detwiler, JA, Edwards, TR, Efremenko, Y, Ejiri, H, Elliott, SR, Giovanetti, GK, Green, MP, Gruszko, J, Guinn, IS, Guiseppe, VE, Haufe, CR, Henning, R, Hervas Aguilar, D, Hoppe, EW, Hostiuc, A, Kidd, MF, Kim, I, Kouzes, RT, Lannen, TEV, Lopez, AM, López-Castaño, JM, Martin, EL, Martin, RD, Massarczyk, R, Meijer, SJ, Mertens, S, Oli, TK, Othman, G, Paudel, LS, Pettus, W, Poon, AWP, Radford, DC, Reine, AL, Rielage, K, Ruof, NW, Tedeschi, D, Varner, RL, Vasilyev, S, Wilkerson, JF, Wiseman, C, Xu, W, Yu, CH, and Zhu, BX
Abstract: Experiments searching for very rare processes such as neutrinoless double-beta decay require a detailed understanding of all sources of background. Signals from radioactive impurities present in construction and detector materials can be suppressed using a number of well-understood techniques. Background from in situ cosmogenic interactions can be reduced by siting an experiment deep underground. However, the next generation of such experiments have unprecedented sensitivity goals of 1028 years half-life with background rates of 10-5cts/(keV kg yr) in the region of interest. To achieve these goals, the remaining cosmogenic background must be well understood. In the work presented here, Majorana Demonstrator data are used to search for decay signatures of metastable germanium isotopes. Contributions to the region of interest in energy and time are estimated using simulations and compared to Demonstrator data. Correlated time-delayed signals are used to identify decay signatures of isotopes produced in the germanium detectors. A good agreement between expected and measured rate is found and different simulation frameworks are used to estimate the uncertainties of the predictions. The simulation campaign is then extended to characterize the background for the LEGEND experiment, a proposed tonne-scale effort searching for neutrinoless double-beta decay in Ge76.
Published: 2022

3. ADC Nonlinearity Correction for the Majorana Demonstrator

Author: Abgrall, N, Abgrall, N, Allmond, JM, Arnquist, IJ, Avignone, FT, Barabash, AS, Barton, CJ, Bertrand, FE, Bos, B, Busch, M, Buuck, M, Caldwell, TS, Campbell, CM, Chan, YD, Christofferson, CD, Chu, P, Clark, ML, Crawford, HL, Cuesta, C, Detwiler, JA, Drobizhev, A, Edwins, DW, Efremenko, Y, Ejiri, H, Elliott, SR, Gilliss, T, Giovanetti, GK, Green, MP, Gruszko, J, Guinn, IS, Guiseppe, VE, Haufe, CR, Hegedus, RJ, Henning, R, Aguilar, DH, Hoppe, EW, Hostiuc, A, Kidd, MF, Kim, I, Kouzes, RT, Lopez, AM, Lopez-Castano, JM, Martin, EL, Martin, RD, Massarczyk, R, Meijer, SJ, Mertens, S, Myslik, J, Oli, TK, Othman, G, Pettus, W, Poon, AWP, Radford, DC, Rager, J, Reine, AL, Rielage, K, Ruof, NW, Stortini, MJ, Tedeschi, D, Varner, RL, Vasilyev, S, White, BR, Wilkerson, JF, Wiseman, C, Xu, W, Yu, CH, Zhu, BX, Shanks, B, Abgrall, N, Abgrall, N, Allmond, JM, Arnquist, IJ, Avignone, FT, Barabash, AS, Barton, CJ, Bertrand, FE, Bos, B, Busch, M, Buuck, M, Caldwell, TS, Campbell, CM, Chan, YD, Christofferson, CD, Chu, P, Clark, ML, Crawford, HL, Cuesta, C, Detwiler, JA, Drobizhev, A, Edwins, DW, Efremenko, Y, Ejiri, H, Elliott, SR, Gilliss, T, Giovanetti, GK, Green, MP, Gruszko, J, Guinn, IS, Guiseppe, VE, Haufe, CR, Hegedus, RJ, Henning, R, Aguilar, DH, Hoppe, EW, Hostiuc, A, Kidd, MF, Kim, I, Kouzes, RT, Lopez, AM, Lopez-Castano, JM, Martin, EL, Martin, RD, Massarczyk, R, Meijer, SJ, Mertens, S, Myslik, J, Oli, TK, Othman, G, Pettus, W, Poon, AWP, Radford, DC, Rager, J, Reine, AL, Rielage, K, Ruof, NW, Stortini, MJ, Tedeschi, D, Varner, RL, Vasilyev, S, White, BR, Wilkerson, JF, Wiseman, C, Xu, W, Yu, CH, Zhu, BX, and Shanks, B
Abstract: Imperfections in analog-to-digital conversion (ADC) cannot be ignored when signal digitization requirements demand both wide dynamic range and high resolution, as is the case for the Majorana Demonstrator 76Ge neutrinoless double-beta decay search. Enabling the experiment's high-resolution spectral analysis and efficient pulse shape discrimination required careful measurement and correction of ADC nonlinearities. A simple measurement protocol was developed that did not require sophisticated equipment or lengthy data-taking campaigns. A slope-dependent hysteresis was observed and characterized. A correction applied to digitized waveforms prior to signal processing reduced the differential and integral nonlinearities by an order of magnitude, eliminating these as dominant contributions to the systematic energy uncertainty at the double-beta decay Q value.
Published: 2021

4. ADC Nonlinearity Correction for the Majorana Demonstrator

Author: Abgrall, N, Abgrall, N, Allmond, JM, Arnquist, IJ, Avignone, FT, Barabash, AS, Barton, CJ, Bertrand, FE, Bos, B, Busch, M, Buuck, M, Caldwell, TS, Campbell, CM, Chan, YD, Christofferson, CD, Chu, P, Clark, ML, Crawford, HL, Cuesta, C, Detwiler, JA, Drobizhev, A, Edwins, DW, Efremenko, Y, Ejiri, H, Elliott, SR, Gilliss, T, Giovanetti, GK, Green, MP, Gruszko, J, Guinn, IS, Guiseppe, VE, Haufe, CR, Hegedus, RJ, Henning, R, Aguilar, DH, Hoppe, EW, Hostiuc, A, Kidd, MF, Kim, I, Kouzes, RT, Lopez, AM, Lopez-Castano, JM, Martin, EL, Martin, RD, Massarczyk, R, Meijer, SJ, Mertens, S, Myslik, J, Oli, TK, Othman, G, Pettus, W, Poon, AWP, Radford, DC, Rager, J, Reine, AL, Rielage, K, Ruof, NW, Stortini, MJ, Tedeschi, D, Varner, RL, Vasilyev, S, White, BR, Wilkerson, JF, Wiseman, C, Xu, W, Yu, CH, Zhu, BX, Shanks, B, Abgrall, N, Abgrall, N, Allmond, JM, Arnquist, IJ, Avignone, FT, Barabash, AS, Barton, CJ, Bertrand, FE, Bos, B, Busch, M, Buuck, M, Caldwell, TS, Campbell, CM, Chan, YD, Christofferson, CD, Chu, P, Clark, ML, Crawford, HL, Cuesta, C, Detwiler, JA, Drobizhev, A, Edwins, DW, Efremenko, Y, Ejiri, H, Elliott, SR, Gilliss, T, Giovanetti, GK, Green, MP, Gruszko, J, Guinn, IS, Guiseppe, VE, Haufe, CR, Hegedus, RJ, Henning, R, Aguilar, DH, Hoppe, EW, Hostiuc, A, Kidd, MF, Kim, I, Kouzes, RT, Lopez, AM, Lopez-Castano, JM, Martin, EL, Martin, RD, Massarczyk, R, Meijer, SJ, Mertens, S, Myslik, J, Oli, TK, Othman, G, Pettus, W, Poon, AWP, Radford, DC, Rager, J, Reine, AL, Rielage, K, Ruof, NW, Stortini, MJ, Tedeschi, D, Varner, RL, Vasilyev, S, White, BR, Wilkerson, JF, Wiseman, C, Xu, W, Yu, CH, Zhu, BX, and Shanks, B
Abstract: Imperfections in analog-to-digital conversion (ADC) cannot be ignored when signal digitization requirements demand both wide dynamic range and high resolution, as is the case for the Majorana Demonstrator 76Ge neutrinoless double-beta decay search. Enabling the experiment's high-resolution spectral analysis and efficient pulse shape discrimination required careful measurement and correction of ADC nonlinearities. A simple measurement protocol was developed that did not require sophisticated equipment or lengthy data-taking campaigns. A slope-dependent hysteresis was observed and characterized. A correction applied to digitized waveforms prior to signal processing reduced the differential and integral nonlinearities by an order of magnitude, eliminating these as dominant contributions to the systematic energy uncertainty at the double-beta decay Q value.
Published: 2021

5. Data quality assurance for the Majorana Demonstrator

Author: Myslik, J, Myslik, J, Abgrall, N, Alvis, SI, Arnquist, IJ, Avignone, FT, Barabash, AS, Barton, CJ, Bertrand, FE, Bode, T, Bradley, AW, Brudanin, V, Busch, M, Buuck, M, Caldwell, TS, Chan, YD, Christofferson, CD, Chu, PH, Cuesta, C, Detwiler, JA, Dunagan, C, Efremenko, Y, Ejiri, H, Elliott, SR, 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, O'Shaughnessy, C, Othman, G, Pettus, W, Poon, AWP, Radford, DC, Rager, J, Reine, AL, Rielage, K, Robertson, RGH, Ruof, NW, Shanks, B, Shirchenko, M, Suriano, AM, Tedeschi, D, Trimble, JE, Varner, RL, Vasilyev, S, Vetter, K, Vorren, K, White, BR, Wilkerson, JF, Wiseman, C, Xu, W, Yakushev, E, Yu, CH, Yumatov, V, Zhitnikov, I, Zhu, BX, Myslik, J, Myslik, J, Abgrall, N, Alvis, SI, Arnquist, IJ, Avignone, FT, Barabash, AS, Barton, CJ, Bertrand, FE, Bode, T, Bradley, AW, Brudanin, V, Busch, M, Buuck, M, Caldwell, TS, Chan, YD, Christofferson, CD, Chu, PH, Cuesta, C, Detwiler, JA, Dunagan, C, Efremenko, Y, Ejiri, H, Elliott, SR, 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, O'Shaughnessy, C, Othman, G, Pettus, W, Poon, AWP, Radford, DC, Rager, J, Reine, AL, Rielage, K, Robertson, RGH, Ruof, NW, Shanks, B, Shirchenko, M, Suriano, AM, Tedeschi, D, Trimble, JE, Varner, RL, Vasilyev, S, Vetter, K, Vorren, K, White, BR, Wilkerson, JF, Wiseman, C, Xu, W, Yakushev, E, Yu, CH, Yumatov, V, Zhitnikov, I, and Zhu, BX
Abstract: The MAJORANA DEMONSTRATOR is an experiment constructed to search for neutrinoless double-beta decays in germanium-76 and to demonstrate the feasibility to deploy a large-scale experiment in a phased and modular fashion. It consists of two modular arrays of natural and 76 Ge-enriched germanium detectors totalling 44.1 kg, located at the 4850' level of the Sanford Underground Research Facility in Lead, South Dakota, USA. Any neutrinoless double-beta decay search requires a thorough understanding of the background and the signal energy spectra. The various techniques employed to ensure the integrity of the measured spectra are discussed. Data collection is monitored with a thorough set of checks, and subsequent careful analysis is performed to qualify the data for higher level physics analysis. Instrumental background events are tagged for removal, and problematic channels are removed from consideration as necessary.
Published: 2020

6. Design improvements to cables and connectors in the Majorana Demonstrator

Author: Haufe, CR, Haufe, CR, Reine, AL, Abgrall, N, Alvis, SI, Arnquist, IJ, Avignone, FT, Barabash, AS, Barton, CJ, Bertrand, FE, Bode, T, Bradley, AW, Brudanin, V, Busch, M, Buuck, M, Caldwell, TS, Chan, YD, Christofferson, CD, Chu, PH, Cuesta, C, Detwiler, JA, Dunagan, C, Efremenko, Y, Ejiri, H, Elliott, SR, Gilliss, T, Giovanetti, GK, Green, MP, Gruszko, J, Guinn, IS, Guiseppe, VE, Hehn, L, Henning, R, Hoppe, EW, Howe, MA, Keeter, KJ, Kidd, MF, Konovalov, SI, Kouzes, RT, Lopez, AM, Martin, RD, Massarczyk, R, Meijer, SJ, Mertens, S, Myslik, J, O'Shaughnessy, C, Othman, G, Pettus, W, Poon, AWP, Radford, DC, Rager, J, Rielage, K, Robertson, RGH, Ruof, NW, Shanks, B, Shirchenko, M, Suriano, AM, Tedeschi, D, Trimble, JE, Varner, RL, Vasilyev, S, Vetter, K, Vorren, K, White, BR, Wilkerson, JF, Wiseman, C, Xu, W, Yakushev, E, Yu, CH, Yumatov, V, Zhitnikov, I, Zhu, BX, Haufe, CR, Haufe, CR, Reine, AL, Abgrall, N, Alvis, SI, Arnquist, IJ, Avignone, FT, Barabash, AS, Barton, CJ, Bertrand, FE, Bode, T, Bradley, AW, Brudanin, V, Busch, M, Buuck, M, Caldwell, TS, Chan, YD, Christofferson, CD, Chu, PH, Cuesta, C, Detwiler, JA, Dunagan, C, Efremenko, Y, Ejiri, H, Elliott, SR, Gilliss, T, Giovanetti, GK, Green, MP, Gruszko, J, Guinn, IS, Guiseppe, VE, Hehn, L, Henning, R, Hoppe, EW, Howe, MA, Keeter, KJ, Kidd, MF, Konovalov, SI, Kouzes, RT, Lopez, AM, Martin, RD, Massarczyk, R, Meijer, SJ, Mertens, S, Myslik, J, O'Shaughnessy, C, Othman, G, Pettus, W, Poon, AWP, Radford, DC, Rager, J, Rielage, K, Robertson, RGH, Ruof, NW, Shanks, B, Shirchenko, M, Suriano, AM, Tedeschi, D, Trimble, JE, Varner, RL, Vasilyev, S, Vetter, K, Vorren, K, White, BR, Wilkerson, JF, Wiseman, C, Xu, W, Yakushev, E, Yu, CH, Yumatov, V, Zhitnikov, I, and Zhu, BX
Abstract: The MAJORANA DEMONSTRATOR is an experiment constructed to search for neutrinoless double-beta decays in germanium-76 and to demonstrate the feasibility to deploy a ton-scale experiment in a phased and modular fashion. It consists of two modular arrays of natural and 76Ge-enriched germanium p-Type point contact detectors totaling 44.1 kg, located at the 4850' level of the Sanford Underground Research Facility in Lead, South Dakota, USA. The DEMONSTRATOR uses custom high voltage cables to bias the detectors, as well as custom signal cables and connectors to read out the charge deposited at each detectors point contact. These low-mass cables and connectors must meet stringent radiopurity requirements while being subjected to thermal and mechanical stress. A number of issues have been identified with the currently installed cables and connectors. An improved set of cables and connectors for the MAJORANA DEMONSTRATOR are being developed with the aim of increasing their overall reliability and connectivity. We will discuss some of the issues encountered with the current cables and connectors as well as our improved designs and their initial performance.
Published: 2020

7. Initial results from the Majorana Demonstrator

Author: Caldwell, TS, Caldwell, TS, Abgrall, N, Alvis, SI, Arnquist, IJ, Avignone, FT, Barabash, AS, Barton, CJ, Bertrand, FE, Bode, T, Bos, B, Bradley, AW, Brudanin, V, Busch, M, Buuck, M, Chan, YDC, Christofferson, CD, Chu, PH, Cuesta, C, Detwiler, JA, Dunagan, C, Efremenko, Y, Ejiri, H, Elliott, SR, Gilliss, T, Giovanetti, GK, Green, MP, Gruszko, J, Guinn, IS, Guiseppe, VE, Haufe, CR, Hehn, L, Henning, R, Hoppe, EW, Howe, MA, Keeter, KJ, Kidd, MF, Konovalov, SI, Kouzes, RT, Lopez, AM, Martin, RD, Massarczyk, R, Meijer, SJ, Mertens, S, Myslik, J, O'Shaughnessy, C, Othman, G, Pettus, W, Poon, AWP, Radford, DC, Rager, J, Reine, AL, Rielage, K, Robertson, RGH, Ruof, NW, Shanks, B, Shirchenko, M, Suriano, AM, Tedeschi, D, Trimble, JE, Varner, RL, Vasilyev, S, Vetter, K, Vorren, K, White, BR, Wilkerson, JF, Wiseman, C, Xu, W, Yakushev, E, Yu, CH, Yumatov, V, Zhitnikov, I, Zhu, BX, Caldwell, TS, Caldwell, TS, Abgrall, N, Alvis, SI, Arnquist, IJ, Avignone, FT, Barabash, AS, Barton, CJ, Bertrand, FE, Bode, T, Bos, B, Bradley, AW, Brudanin, V, Busch, M, Buuck, M, Chan, YDC, Christofferson, CD, Chu, PH, Cuesta, C, Detwiler, JA, Dunagan, C, Efremenko, Y, Ejiri, H, Elliott, SR, Gilliss, T, Giovanetti, GK, Green, MP, Gruszko, J, Guinn, IS, Guiseppe, VE, Haufe, CR, Hehn, L, Henning, R, Hoppe, EW, Howe, MA, Keeter, KJ, Kidd, MF, Konovalov, SI, Kouzes, RT, Lopez, AM, Martin, RD, Massarczyk, R, Meijer, SJ, Mertens, S, Myslik, J, O'Shaughnessy, C, Othman, G, Pettus, W, Poon, AWP, Radford, DC, Rager, J, Reine, AL, Rielage, K, Robertson, RGH, Ruof, NW, Shanks, B, Shirchenko, M, Suriano, AM, Tedeschi, D, Trimble, JE, Varner, RL, Vasilyev, S, Vetter, K, Vorren, K, White, BR, Wilkerson, JF, Wiseman, C, Xu, W, Yakushev, E, Yu, CH, Yumatov, V, Zhitnikov, I, and Zhu, BX
Abstract: The Majorana Collaboration has assembled an array of high purity Ge detectors to search for neutrinoless double-beta decay in 76Ge with the goal of establishing the required background and scalability of a Ge-based next-generation ton-scale experiment. The Majorana Demonstrator consists of 44 kg of high-purity Ge (HPGe) detectors (30 kg enriched in 76Ge) with a low-noise p-Type point contact (PPC) geometry. The detectors are split between two modules which are contained in a single lead and high-purity copper shield at the Sanford Underground Research Facility in Lead, South Dakota. Following a commissioning run that started in June 2015, the full detector array has been acquiring data since August 2016. We will discuss the status of the Majorana Demonstrator and initial results from the first physics run; including current background estimates, exotic low-energy physics searches, projections on the physics reach of the Demonstrator, and implications for a ton-scale Ge-based neutrinoless double-beta decay search.
Published: 2020

8. Status update of the majorana demonstrator neutrinoless double beta decay experiment

Author: Gruszko, J, Gruszko, J, Buuck, M, Cuesta, C, Detwiler, JA, Guinn, IS, Leon, J, Robertson, RGH, Abgrall, N, Bradley, AW, Chan, YD, Mertens, S, Poon, AWP, Arnquist, IJ, Hoppe, EW, Kouzes, RT, LaFerriere, BD, Orrell, JL, Avignone, FT, Barabash, AS, Konovalov, SI, Yumatov, V, Bertrand, FE, Galindo-Uribarri, A, Radford, DC, Varner, RL, White, BR, Yu, CH, Brudanin, V, Shirchenko, M, Vasilyev, S, Yakushev, E, Zhitnikov, I, Busch, M, Byram, D, Jasinski, BR, Snyder, N, Caldwell, AS, Christofferson, CD, Dunagan, C, Howard, S, Suriano, AM, Chu, PH, Elliott, SR, Goett, J, Massarczyk, R, Rielage, K, Xu, W, Efremenko, Y, Ejiri, H, Gilliss, T, Giovanetti, GK, Henning, R, Howe, MA, MacMullin, J, Meijer, SJ, O'Shaughnessy, C, Rager, J, Shanks, B, Trimble, JE, Vorren, K, Green, MP, Guiseppe, VE, Tedeschi, D, Wiseman, C, Keeter, KJ, Kidd, MF, Martin, RD, Romero-Romero, E, Vetter, K, Wilkerson, JF, Gruszko, J, Gruszko, J, Buuck, M, Cuesta, C, Detwiler, JA, Guinn, IS, Leon, J, Robertson, RGH, Abgrall, N, Bradley, AW, Chan, YD, Mertens, S, Poon, AWP, Arnquist, IJ, Hoppe, EW, Kouzes, RT, LaFerriere, BD, Orrell, JL, Avignone, FT, Barabash, AS, Konovalov, SI, Yumatov, V, Bertrand, FE, Galindo-Uribarri, A, Radford, DC, Varner, RL, White, BR, Yu, CH, Brudanin, V, Shirchenko, M, Vasilyev, S, Yakushev, E, Zhitnikov, I, Busch, M, Byram, D, Jasinski, BR, Snyder, N, Caldwell, AS, Christofferson, CD, Dunagan, C, Howard, S, Suriano, AM, Chu, PH, Elliott, SR, Goett, J, Massarczyk, R, Rielage, K, Xu, W, Efremenko, Y, Ejiri, H, Gilliss, T, Giovanetti, GK, Henning, R, Howe, MA, MacMullin, J, Meijer, SJ, O'Shaughnessy, C, Rager, J, Shanks, B, Trimble, JE, Vorren, K, Green, MP, Guiseppe, VE, Tedeschi, D, Wiseman, C, Keeter, KJ, Kidd, MF, Martin, RD, Romero-Romero, E, Vetter, K, and Wilkerson, JF
Abstract: Neutrinoless double beta decay searches play a major role in determining neutrino properties, in particular the Majorana or Dirac nature of the neutrino and the absolute scale of the neutrino mass. The consequences of these searches go beyond neutrino physics, with implications for Grand Unification and leptogenesis. The Majorana Collaboration is assembling a low-background array of high purity Germanium (HPGe) detectors to search for neutrinoless double-beta decay in 76Ge. The Majorana Demonstrator, which is currently being constructed and commissioned at the Sanford Underground Research Facility in Lead, South Dakota, will contain 44 kg (30 kg enriched in 76Ge) of HPGe detectors. Its primary goal is to demonstrate the scalability and background required for a tonne-scale Ge experiment. This is accomplished via a modular design and projected background of less than 3 cnts/tonne-yr in the region of interest. The experiment is currently taking data with the first of its enriched detectors.
Published: 2020

9. Design improvements to cables and connectors in the Majorana Demonstrator

Author: Haufe, CR, Haufe, CR, Reine, AL, Abgrall, N, Alvis, SI, Arnquist, IJ, Avignone, FT, Barabash, AS, Barton, CJ, Bertrand, FE, Bode, T, Bradley, AW, Brudanin, V, Busch, M, Buuck, M, Caldwell, TS, Chan, YD, Christofferson, CD, Chu, PH, Cuesta, C, Detwiler, JA, Dunagan, C, Efremenko, Y, Ejiri, H, Elliott, SR, Gilliss, T, Giovanetti, GK, Green, MP, Gruszko, J, Guinn, IS, Guiseppe, VE, Hehn, L, Henning, R, Hoppe, EW, Howe, MA, Keeter, KJ, Kidd, MF, Konovalov, SI, Kouzes, RT, Lopez, AM, Martin, RD, Massarczyk, R, Meijer, SJ, Mertens, S, Myslik, J, O'Shaughnessy, C, Othman, G, Pettus, W, Poon, AWP, Radford, DC, Rager, J, Rielage, K, Robertson, RGH, Ruof, NW, Shanks, B, Shirchenko, M, Suriano, AM, Tedeschi, D, Trimble, JE, Varner, RL, Vasilyev, S, Vetter, K, Vorren, K, White, BR, Wilkerson, JF, Wiseman, C, Xu, W, Yakushev, E, Yu, CH, Yumatov, V, Zhitnikov, I, Zhu, BX, Haufe, CR, Haufe, CR, Reine, AL, Abgrall, N, Alvis, SI, Arnquist, IJ, Avignone, FT, Barabash, AS, Barton, CJ, Bertrand, FE, Bode, T, Bradley, AW, Brudanin, V, Busch, M, Buuck, M, Caldwell, TS, Chan, YD, Christofferson, CD, Chu, PH, Cuesta, C, Detwiler, JA, Dunagan, C, Efremenko, Y, Ejiri, H, Elliott, SR, Gilliss, T, Giovanetti, GK, Green, MP, Gruszko, J, Guinn, IS, Guiseppe, VE, Hehn, L, Henning, R, Hoppe, EW, Howe, MA, Keeter, KJ, Kidd, MF, Konovalov, SI, Kouzes, RT, Lopez, AM, Martin, RD, Massarczyk, R, Meijer, SJ, Mertens, S, Myslik, J, O'Shaughnessy, C, Othman, G, Pettus, W, Poon, AWP, Radford, DC, Rager, J, Rielage, K, Robertson, RGH, Ruof, NW, Shanks, B, Shirchenko, M, Suriano, AM, Tedeschi, D, Trimble, JE, Varner, RL, Vasilyev, S, Vetter, K, Vorren, K, White, BR, Wilkerson, JF, Wiseman, C, Xu, W, Yakushev, E, Yu, CH, Yumatov, V, Zhitnikov, I, and Zhu, BX
Abstract: The MAJORANA DEMONSTRATOR is an experiment constructed to search for neutrinoless double-beta decays in germanium-76 and to demonstrate the feasibility to deploy a ton-scale experiment in a phased and modular fashion. It consists of two modular arrays of natural and 76Ge-enriched germanium p-Type point contact detectors totaling 44.1 kg, located at the 4850' level of the Sanford Underground Research Facility in Lead, South Dakota, USA. The DEMONSTRATOR uses custom high voltage cables to bias the detectors, as well as custom signal cables and connectors to read out the charge deposited at each detectors point contact. These low-mass cables and connectors must meet stringent radiopurity requirements while being subjected to thermal and mechanical stress. A number of issues have been identified with the currently installed cables and connectors. An improved set of cables and connectors for the MAJORANA DEMONSTRATOR are being developed with the aim of increasing their overall reliability and connectivity. We will discuss some of the issues encountered with the current cables and connectors as well as our improved designs and their initial performance.
Published: 2020

10. Data quality assurance for the Majorana Demonstrator

Author: Myslik, J, Myslik, J, Abgrall, N, Alvis, SI, Arnquist, IJ, Avignone, FT, Barabash, AS, Barton, CJ, Bertrand, FE, Bode, T, Bradley, AW, Brudanin, V, Busch, M, Buuck, M, Caldwell, TS, Chan, YD, Christofferson, CD, Chu, PH, Cuesta, C, Detwiler, JA, Dunagan, C, Efremenko, Y, Ejiri, H, Elliott, SR, 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, O'Shaughnessy, C, Othman, G, Pettus, W, Poon, AWP, Radford, DC, Rager, J, Reine, AL, Rielage, K, Robertson, RGH, Ruof, NW, Shanks, B, Shirchenko, M, Suriano, AM, Tedeschi, D, Trimble, JE, Varner, RL, Vasilyev, S, Vetter, K, Vorren, K, White, BR, Wilkerson, JF, Wiseman, C, Xu, W, Yakushev, E, Yu, CH, Yumatov, V, Zhitnikov, I, Zhu, BX, Myslik, J, Myslik, J, Abgrall, N, Alvis, SI, Arnquist, IJ, Avignone, FT, Barabash, AS, Barton, CJ, Bertrand, FE, Bode, T, Bradley, AW, Brudanin, V, Busch, M, Buuck, M, Caldwell, TS, Chan, YD, Christofferson, CD, Chu, PH, Cuesta, C, Detwiler, JA, Dunagan, C, Efremenko, Y, Ejiri, H, Elliott, SR, 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, O'Shaughnessy, C, Othman, G, Pettus, W, Poon, AWP, Radford, DC, Rager, J, Reine, AL, Rielage, K, Robertson, RGH, Ruof, NW, Shanks, B, Shirchenko, M, Suriano, AM, Tedeschi, D, Trimble, JE, Varner, RL, Vasilyev, S, Vetter, K, Vorren, K, White, BR, Wilkerson, JF, Wiseman, C, Xu, W, Yakushev, E, Yu, CH, Yumatov, V, Zhitnikov, I, and Zhu, BX
Abstract: The MAJORANA DEMONSTRATOR is an experiment constructed to search for neutrinoless double-beta decays in germanium-76 and to demonstrate the feasibility to deploy a large-scale experiment in a phased and modular fashion. It consists of two modular arrays of natural and 76 Ge-enriched germanium detectors totalling 44.1 kg, located at the 4850' level of the Sanford Underground Research Facility in Lead, South Dakota, USA. Any neutrinoless double-beta decay search requires a thorough understanding of the background and the signal energy spectra. The various techniques employed to ensure the integrity of the measured spectra are discussed. Data collection is monitored with a thorough set of checks, and subsequent careful analysis is performed to qualify the data for higher level physics analysis. Instrumental background events are tagged for removal, and problematic channels are removed from consideration as necessary.
Published: 2020

11. Status update of the majorana demonstrator neutrinoless double beta decay experiment

Author: Gruszko, J, Gruszko, J, Buuck, M, Cuesta, C, Detwiler, JA, Guinn, IS, Leon, J, Robertson, RGH, Abgrall, N, Bradley, AW, Chan, YD, Mertens, S, Poon, AWP, Arnquist, IJ, Hoppe, EW, Kouzes, RT, LaFerriere, BD, Orrell, JL, Avignone, FT, Barabash, AS, Konovalov, SI, Yumatov, V, Bertrand, FE, Galindo-Uribarri, A, Radford, DC, Varner, RL, White, BR, Yu, CH, Brudanin, V, Shirchenko, M, Vasilyev, S, Yakushev, E, Zhitnikov, I, Busch, M, Byram, D, Jasinski, BR, Snyder, N, Caldwell, AS, Christofferson, CD, Dunagan, C, Howard, S, Suriano, AM, Chu, PH, Elliott, SR, Goett, J, Massarczyk, R, Rielage, K, Xu, W, Efremenko, Y, Ejiri, H, Gilliss, T, Giovanetti, GK, Henning, R, Howe, MA, MacMullin, J, Meijer, SJ, O'Shaughnessy, C, Rager, J, Shanks, B, Trimble, JE, Vorren, K, Green, MP, Guiseppe, VE, Tedeschi, D, Wiseman, C, Keeter, KJ, Kidd, MF, Martin, RD, Romero-Romero, E, Vetter, K, Wilkerson, JF, Gruszko, J, Gruszko, J, Buuck, M, Cuesta, C, Detwiler, JA, Guinn, IS, Leon, J, Robertson, RGH, Abgrall, N, Bradley, AW, Chan, YD, Mertens, S, Poon, AWP, Arnquist, IJ, Hoppe, EW, Kouzes, RT, LaFerriere, BD, Orrell, JL, Avignone, FT, Barabash, AS, Konovalov, SI, Yumatov, V, Bertrand, FE, Galindo-Uribarri, A, Radford, DC, Varner, RL, White, BR, Yu, CH, Brudanin, V, Shirchenko, M, Vasilyev, S, Yakushev, E, Zhitnikov, I, Busch, M, Byram, D, Jasinski, BR, Snyder, N, Caldwell, AS, Christofferson, CD, Dunagan, C, Howard, S, Suriano, AM, Chu, PH, Elliott, SR, Goett, J, Massarczyk, R, Rielage, K, Xu, W, Efremenko, Y, Ejiri, H, Gilliss, T, Giovanetti, GK, Henning, R, Howe, MA, MacMullin, J, Meijer, SJ, O'Shaughnessy, C, Rager, J, Shanks, B, Trimble, JE, Vorren, K, Green, MP, Guiseppe, VE, Tedeschi, D, Wiseman, C, Keeter, KJ, Kidd, MF, Martin, RD, Romero-Romero, E, Vetter, K, and Wilkerson, JF
Abstract: Neutrinoless double beta decay searches play a major role in determining neutrino properties, in particular the Majorana or Dirac nature of the neutrino and the absolute scale of the neutrino mass. The consequences of these searches go beyond neutrino physics, with implications for Grand Unification and leptogenesis. The Majorana Collaboration is assembling a low-background array of high purity Germanium (HPGe) detectors to search for neutrinoless double-beta decay in 76Ge. The Majorana Demonstrator, which is currently being constructed and commissioned at the Sanford Underground Research Facility in Lead, South Dakota, will contain 44 kg (30 kg enriched in 76Ge) of HPGe detectors. Its primary goal is to demonstrate the scalability and background required for a tonne-scale Ge experiment. This is accomplished via a modular design and projected background of less than 3 cnts/tonne-yr in the region of interest. The experiment is currently taking data with the first of its enriched detectors.
Published: 2020

12. Initial results from the Majorana Demonstrator

Author: Caldwell, TS, Caldwell, TS, Abgrall, N, Alvis, SI, Arnquist, IJ, Avignone, FT, Barabash, AS, Barton, CJ, Bertrand, FE, Bode, T, Bos, B, Bradley, AW, Brudanin, V, Busch, M, Buuck, M, Chan, YDC, Christofferson, CD, Chu, PH, Cuesta, C, Detwiler, JA, Dunagan, C, Efremenko, Y, Ejiri, H, Elliott, SR, Gilliss, T, Giovanetti, GK, Green, MP, Gruszko, J, Guinn, IS, Guiseppe, VE, Haufe, CR, Hehn, L, Henning, R, Hoppe, EW, Howe, MA, Keeter, KJ, Kidd, MF, Konovalov, SI, Kouzes, RT, Lopez, AM, Martin, RD, Massarczyk, R, Meijer, SJ, Mertens, S, Myslik, J, O'Shaughnessy, C, Othman, G, Pettus, W, Poon, AWP, Radford, DC, Rager, J, Reine, AL, Rielage, K, Robertson, RGH, Ruof, NW, Shanks, B, Shirchenko, M, Suriano, AM, Tedeschi, D, Trimble, JE, Varner, RL, Vasilyev, S, Vetter, K, Vorren, K, White, BR, Wilkerson, JF, Wiseman, C, Xu, W, Yakushev, E, Yu, CH, Yumatov, V, Zhitnikov, I, Zhu, BX, Caldwell, TS, Caldwell, TS, Abgrall, N, Alvis, SI, Arnquist, IJ, Avignone, FT, Barabash, AS, Barton, CJ, Bertrand, FE, Bode, T, Bos, B, Bradley, AW, Brudanin, V, Busch, M, Buuck, M, Chan, YDC, Christofferson, CD, Chu, PH, Cuesta, C, Detwiler, JA, Dunagan, C, Efremenko, Y, Ejiri, H, Elliott, SR, Gilliss, T, Giovanetti, GK, Green, MP, Gruszko, J, Guinn, IS, Guiseppe, VE, Haufe, CR, Hehn, L, Henning, R, Hoppe, EW, Howe, MA, Keeter, KJ, Kidd, MF, Konovalov, SI, Kouzes, RT, Lopez, AM, Martin, RD, Massarczyk, R, Meijer, SJ, Mertens, S, Myslik, J, O'Shaughnessy, C, Othman, G, Pettus, W, Poon, AWP, Radford, DC, Rager, J, Reine, AL, Rielage, K, Robertson, RGH, Ruof, NW, Shanks, B, Shirchenko, M, Suriano, AM, Tedeschi, D, Trimble, JE, Varner, RL, Vasilyev, S, Vetter, K, Vorren, K, White, BR, Wilkerson, JF, Wiseman, C, Xu, W, Yakushev, E, Yu, CH, Yumatov, V, Zhitnikov, I, and Zhu, BX
Abstract: The Majorana Collaboration has assembled an array of high purity Ge detectors to search for neutrinoless double-beta decay in 76Ge with the goal of establishing the required background and scalability of a Ge-based next-generation ton-scale experiment. The Majorana Demonstrator consists of 44 kg of high-purity Ge (HPGe) detectors (30 kg enriched in 76Ge) with a low-noise p-Type point contact (PPC) geometry. The detectors are split between two modules which are contained in a single lead and high-purity copper shield at the Sanford Underground Research Facility in Lead, South Dakota. Following a commissioning run that started in June 2015, the full detector array has been acquiring data since August 2016. We will discuss the status of the Majorana Demonstrator and initial results from the first physics run; including current background estimates, exotic low-energy physics searches, projections on the physics reach of the Demonstrator, and implications for a ton-scale Ge-based neutrinoless double-beta decay search.
Published: 2020

13. Recent results from the Majorana Demonstrator

Author: Myslik, J, Myslik, J, Alvis, SI, Arnquist, IJ, Avignone, FT, Barabash, AS, Barton, CJ, Bertrand, FE, Bode, T, Bos, B, Brudanin, V, Busch, M, Buuck, M, Caldwell, TS, Chan, YD, Christofferson, CD, Chu, PH, Cuesta, C, Detwiler, JA, Dunagan, C, Efremenko, Y, Ejiri, H, Elliott, SR, Gilliss, T, Giovanetti, GK, Green, MP, Gruszko, J, Guinn, IS, Guiseppe, VE, Haufe, CR, Hegedus, RJ, Hehn, L, Henning, R, Hervas Aguilar, D, Hoppe, EW, Howe, MA, Keeter, KJ, Kidd, MF, Konovalov, SI, Kouzes, RT, Lopez, AM, Martin, RD, Massarczyk, R, Meijer, SJ, Mertens, S, 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, Vasundhara, White, BR, Wilkerson, JF, Wiseman, C, Xu, W, Yakushev, E, Yu, CH, Yumatov, V, Zhitnikov, I, Zhu, BX, Myslik, J, Myslik, J, Alvis, SI, Arnquist, IJ, Avignone, FT, Barabash, AS, Barton, CJ, Bertrand, FE, Bode, T, Bos, B, Brudanin, V, Busch, M, Buuck, M, Caldwell, TS, Chan, YD, Christofferson, CD, Chu, PH, Cuesta, C, Detwiler, JA, Dunagan, C, Efremenko, Y, Ejiri, H, Elliott, SR, Gilliss, T, Giovanetti, GK, Green, MP, Gruszko, J, Guinn, IS, Guiseppe, VE, Haufe, CR, Hegedus, RJ, Hehn, L, Henning, R, Hervas Aguilar, D, Hoppe, EW, Howe, MA, Keeter, KJ, Kidd, MF, Konovalov, SI, Kouzes, RT, Lopez, AM, Martin, RD, Massarczyk, R, Meijer, SJ, Mertens, S, 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, Vasundhara, White, BR, Wilkerson, JF, Wiseman, C, Xu, W, Yakushev, E, Yu, CH, Yumatov, V, Zhitnikov, I, and Zhu, BX
Abstract: The MAJORANA DEMONSTRATOR is an experiment constructed to search for neutrinoless double-beta decay in 76Ge and to demonstrate the feasibility to deploy a large-scale experiment in a phased and modular fashion. It consists of two modules of natural and 76Ge-enriched germanium detectors totalling 44.1 kg, operating at the 4850' level of the Sanford Underground Research Facility in Lead, South Dakota, USA. Commissioning of the experiment began in June 2015, followed by data production with the full detector array in August 2016. The ultra-low background and record energy resolution achieved by the MAJORANA DEMONSTRATOR enable a sensitive neutrinoless double-beta decay search, as well as additional searches for physics beyond the Standard Model. I will discuss the design elements that enable these searches, along with the latest results, focusing on the neutrinoless double-beta decay search. I will also discuss the current status and the future plans of the MAJORANA DEMONSTRATOR, as well as the plans for a future tonne-scale 76Ge experiment.
Published: 2019

14. Recent results from the Majorana Demonstrator

Author: Myslik, J, Myslik, J, Alvis, SI, Arnquist, IJ, Avignone, FT, Barabash, AS, Barton, CJ, Bertrand, FE, Bode, T, Bos, B, Brudanin, V, Busch, M, Buuck, M, Caldwell, TS, Chan, YD, Christofferson, CD, Chu, PH, Cuesta, C, Detwiler, JA, Dunagan, C, Efremenko, Y, Ejiri, H, Elliott, SR, Gilliss, T, Giovanetti, GK, Green, MP, Gruszko, J, Guinn, IS, Guiseppe, VE, Haufe, CR, Hegedus, RJ, Hehn, L, Henning, R, Hervas Aguilar, D, Hoppe, EW, Howe, MA, Keeter, KJ, Kidd, MF, Konovalov, SI, Kouzes, RT, Lopez, AM, Martin, RD, Massarczyk, R, Meijer, SJ, Mertens, S, 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, Vasundhara, White, BR, Wilkerson, JF, Wiseman, C, Xu, W, Yakushev, E, Yu, CH, Yumatov, V, Zhitnikov, I, Zhu, BX, Myslik, J, Myslik, J, Alvis, SI, Arnquist, IJ, Avignone, FT, Barabash, AS, Barton, CJ, Bertrand, FE, Bode, T, Bos, B, Brudanin, V, Busch, M, Buuck, M, Caldwell, TS, Chan, YD, Christofferson, CD, Chu, PH, Cuesta, C, Detwiler, JA, Dunagan, C, Efremenko, Y, Ejiri, H, Elliott, SR, Gilliss, T, Giovanetti, GK, Green, MP, Gruszko, J, Guinn, IS, Guiseppe, VE, Haufe, CR, Hegedus, RJ, Hehn, L, Henning, R, Hervas Aguilar, D, Hoppe, EW, Howe, MA, Keeter, KJ, Kidd, MF, Konovalov, SI, Kouzes, RT, Lopez, AM, Martin, RD, Massarczyk, R, Meijer, SJ, Mertens, S, 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, Vasundhara, White, BR, Wilkerson, JF, Wiseman, C, Xu, W, Yakushev, E, Yu, CH, Yumatov, V, Zhitnikov, I, and Zhu, BX
Abstract: The MAJORANA DEMONSTRATOR is an experiment constructed to search for neutrinoless double-beta decay in 76Ge and to demonstrate the feasibility to deploy a large-scale experiment in a phased and modular fashion. It consists of two modules of natural and 76Ge-enriched germanium detectors totalling 44.1 kg, operating at the 4850' level of the Sanford Underground Research Facility in Lead, South Dakota, USA. Commissioning of the experiment began in June 2015, followed by data production with the full detector array in August 2016. The ultra-low background and record energy resolution achieved by the MAJORANA DEMONSTRATOR enable a sensitive neutrinoless double-beta decay search, as well as additional searches for physics beyond the Standard Model. I will discuss the design elements that enable these searches, along with the latest results, focusing on the neutrinoless double-beta decay search. I will also discuss the current status and the future plans of the MAJORANA DEMONSTRATOR, as well as the plans for a future tonne-scale 76Ge experiment.
Published: 2019

15. Recent results of the Majorana Demonstrator experiment

Author: López-Castaño, JM, 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, Zhu, BX, López-Castaño, JM, 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
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

16. Recent results from the MAJORANA DEMONSTRATOR

Author: Myslik, Jordan, Myslik, Jordan, Alvis, SI, Arnquist, IJ, Avignone III, FT, Barabash, AS, Barton, CJ, Bertrand, FE, Bode, T, Bos, B, 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, Guiseppe, VE, Haufe, CR, Hegedus, RJ, Hehn, L, Henning, R, Hervas Aguilar, D, Hoppe, EW, Howe, MA, Keeter, KJ, Kidd, MF, Konovalov, SI, Kouzes, RT, Lopez, AM, Martin, RD, Massarczyk, R, Meijer, SJ, Mertens, S, 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, Vasundhara, White, BR, Wilkerson, JF, Wiseman, C, Xu, W, Yakushev, E, Yu, C-H, Yumatov, V, Zhitnikov, I, Zhu, BX, Myslik, Jordan, Myslik, Jordan, Alvis, SI, Arnquist, IJ, Avignone III, FT, Barabash, AS, Barton, CJ, Bertrand, FE, Bode, T, Bos, B, 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, Guiseppe, VE, Haufe, CR, Hegedus, RJ, Hehn, L, Henning, R, Hervas Aguilar, D, Hoppe, EW, Howe, MA, Keeter, KJ, Kidd, MF, Konovalov, SI, Kouzes, RT, Lopez, AM, Martin, RD, Massarczyk, R, Meijer, SJ, Mertens, S, 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, Vasundhara, White, BR, Wilkerson, JF, Wiseman, C, Xu, W, Yakushev, E, Yu, C-H, Yumatov, V, Zhitnikov, I, and Zhu, BX
Abstract: The MAJORANA DEMONSTRATOR is an experiment constructed to search for neutrinoless double-beta decay in 76Ge and to demonstrate the feasibility to deploy a large-scale experiment in a phased and modular fashion. It consists of two modules of natural and 76Ge-enriched germanium detectors totalling 44.1 kg, operating at the 4850' level of the Sanford Underground Research Facility in Lead, South Dakota, USA. Commissioning of the experiment began in June 2015, followed by data production with the full detector array in August 2016. The ultra-low background and record energy resolution achieved by the MAJORANA DEMONSTRATOR enable a sensitive neutrinoless double-beta decay search, as well as additional searches for physics beyond the Standard Model. I will discuss the design elements that enable these searches, along with the latest results, focusing on the neutrinoless double-beta decay search. I will also discuss the current status and the future plans of the MAJORANA DEMONSTRATOR, as well as the plans for a future tonne-scale 76Ge experiment.
Published: 2019

17. Recent results from the MAJORANA DEMONSTRATOR

Author: Myslik, J, Myslik, J, Alvis, SI, Arnquist, IJ, III, FT Avignone, Barabash, AS, Barton, CJ, Bertrand, FE, Bode, T, Bos, B, 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, Guiseppe, VE, Haufe, CR, Hegedus, RJ, Hehn, L, Henning, R, Aguilar, D Hervas, Hoppe, EW, Howe, MA, Keeter, KJ, Kidd, MF, Konovalov, SI, Kouzes, RT, Lopez, AM, Martin, RD, Massarczyk, R, Meijer, SJ, Mertens, S, 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, Vasundhara, White, BR, Wilkerson, JF, Wiseman, C, Xu, W, Yakushev, E, Yu, C-H, Yumatov, V, Zhitnikov, I, Zhu, BX, Myslik, J, Myslik, J, Alvis, SI, Arnquist, IJ, III, FT Avignone, Barabash, AS, Barton, CJ, Bertrand, FE, Bode, T, Bos, B, 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, Guiseppe, VE, Haufe, CR, Hegedus, RJ, Hehn, L, Henning, R, Aguilar, D Hervas, Hoppe, EW, Howe, MA, Keeter, KJ, Kidd, MF, Konovalov, SI, Kouzes, RT, Lopez, AM, Martin, RD, Massarczyk, R, Meijer, SJ, Mertens, S, 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, Vasundhara, White, BR, Wilkerson, JF, Wiseman, C, Xu, W, Yakushev, E, Yu, C-H, Yumatov, V, Zhitnikov, I, and Zhu, BX
Abstract: The MAJORANA DEMONSTRATOR is an experiment constructed to search for neutrinoless double-beta decay in $^{76}$Ge and to demonstrate the feasibility to deploy a large-scale experiment in a phased and modular fashion. It consists of two modules of natural and $^{76}$Ge-enriched germanium detectors totalling 44.1 kg, operating at the 4850' level of the Sanford Underground Research Facility in Lead, South Dakota, USA. Commissioning of the experiment began in June 2015, followed by data production with the full detector array in August 2016. The ultra-low background and record energy resolution achieved by the MAJORANA DEMONSTRATOR enable a sensitive neutrinoless double-beta decay search, as well as additional searches for physics beyond the Standard Model. I will discuss the design elements that enable these searches, along with the latest results, focusing on the neutrinoless double-beta decay search. I will also discuss the current status and the future plans of the MAJORANA DEMONSTRATOR, as well as the plans for a future tonne-scale $^{76}$Ge experiment.
Published: 2018

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

Author: Busch, M, 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, YD, Christofferson, CD, Chu, PH, Cuesta, C, Detwiler, JA, Dunagan, C, Efremenko, Y, Ejiri, H, Elliott, SR, Gilliss, T, Giovanetti, GK, Green, MP, Gruszko, J, Guinn, IS, Guiseppe, VE, Haufe, CR, Hehn, L, Henning, R, Hoppe, EW, Howe, MA, 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, CH, Yumatov, V, Zhitnikov, I, Zhu, BX, Busch, M, 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, YD, Christofferson, CD, Chu, PH, Cuesta, C, Detwiler, JA, Dunagan, C, Efremenko, Y, Ejiri, H, Elliott, SR, Gilliss, T, Giovanetti, GK, Green, MP, Gruszko, J, Guinn, IS, Guiseppe, VE, Haufe, CR, Hehn, L, Henning, R, Hoppe, EW, Howe, MA, 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, CH, Yumatov, V, Zhitnikov, I, and Zhu, BX
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

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

Author: Christofferson, CD, 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, YD, Chu, PH, Cuesta, C, Detwiler, JA, Dunagan, C, Efremenko, Y, Ejiri, H, Elliott, SR, Gilliss, T, Giovanetti, GK, Green, MP, Gruszko, J, Guinn, IS, Guiseppe, VE, Haufe, CR, Hehn, L, Henning, R, Hoppe, EW, Howe, MA, 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, CH, Yumatov, V, Zhitnikov, I, Zhu, BX, Christofferson, CD, 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, YD, Chu, PH, Cuesta, C, Detwiler, JA, Dunagan, C, Efremenko, Y, Ejiri, H, Elliott, SR, Gilliss, T, Giovanetti, GK, Green, MP, Gruszko, J, Guinn, IS, Guiseppe, VE, Haufe, CR, Hehn, L, Henning, R, Hoppe, EW, Howe, MA, 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, CH, Yumatov, V, Zhitnikov, I, and Zhu, BX
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

20. The processing of enriched germanium for the MAJORANA DEMONSTRATOR and R&D for a next generation double-beta decay experiment

Author: Abgrall, N, Abgrall, N, Arnquist, IJ, Avignone, FT, Barabash, AS, Bertrand, FE, Bradley, AW, Brudanin, V, Busch, M, Buuck, M, Caja, J, Caja, M, Caldwell, TS, Christofferson, CD, Chu, PH, Cuesta, C, Detwiler, JA, Dunagan, C, Dunstan, DT, Efremenko, Y, Ejiri, H, Elliott, SR, Gilliss, T, Giovanetti, GK, Goett, J, Green, MP, Gruszko, J, Guinn, IS, Guiseppe, VE, Haufe, CRS, Henning, R, Hoppe, EW, Jasinski, BR, Kidd, MF, Konovalov, SI, Kouzes, RT, Lopez, AM, MacMullin, J, Martin, RD, Massarczyk, R, Meijer, SJ, Mertens, S, Meyer, JH, Myslik, J, O'Shaughnessy, C, Poon, AWP, Radford, DC, Rager, J, Reine, AL, Reising, JA, Rielage, K, Robertson, RGH, Shanks, B, Shirchenko, M, Suriano, AM, Tedeschi, D, Toth, LM, Trimble, JE, Varner, RL, Vasilyev, S, Vetter, K, Vorren, K, White, BR, Wilkerson, JF, Wiseman, C, Xu, W, Yakushev, E, Yu, CH, Yumatov, V, Zhitnikov, I, Zhu, BX, Abgrall, N, Abgrall, N, Arnquist, IJ, Avignone, FT, Barabash, AS, Bertrand, FE, Bradley, AW, Brudanin, V, Busch, M, Buuck, M, Caja, J, Caja, M, Caldwell, TS, Christofferson, CD, Chu, PH, Cuesta, C, Detwiler, JA, Dunagan, C, Dunstan, DT, Efremenko, Y, Ejiri, H, Elliott, SR, Gilliss, T, Giovanetti, GK, Goett, J, Green, MP, Gruszko, J, Guinn, IS, Guiseppe, VE, Haufe, CRS, Henning, R, Hoppe, EW, Jasinski, BR, Kidd, MF, Konovalov, SI, Kouzes, RT, Lopez, AM, MacMullin, J, Martin, RD, Massarczyk, R, Meijer, SJ, Mertens, S, Meyer, JH, Myslik, J, O'Shaughnessy, C, Poon, AWP, Radford, DC, Rager, J, Reine, AL, Reising, JA, Rielage, K, Robertson, RGH, Shanks, B, Shirchenko, M, Suriano, AM, Tedeschi, D, Toth, LM, Trimble, JE, Varner, RL, Vasilyev, S, Vetter, K, Vorren, K, White, BR, Wilkerson, JF, Wiseman, C, Xu, W, Yakushev, E, Yu, CH, Yumatov, V, Zhitnikov, I, and Zhu, BX
Abstract: The MAJORANA DEMONSTRATOR is an array of point-contact Ge detectors fabricated from Ge isotopically enriched to 88% in 76Ge to search for neutrinoless double beta decay. The processing of Ge for germanium detectors is a well-known technology. However, because of the high cost of Ge enriched in 76Ge special procedures were required to maximize the yield of detector mass and to minimize exposure to cosmic rays. These procedures include careful accounting for the material; shielding it to reduce cosmogenic generation of radioactive isotopes; and development of special reprocessing techniques for contaminated solid germanium, shavings, grindings, acid etchant and cutting fluids from detector fabrication. Processing procedures were developed that resulted in a total yield in detector mass of 70%. However, none of the acid-etch solution and only 50% of the cutting fluids from detector fabrication were reprocessed. Had they been processed, the projections for the recovery yield would be between 80% and 85%. Maximizing yield is critical to justify a possible future ton-scale experiment. A process for recovery of germanium from the acid-etch solution was developed with yield of about 90%. All material was shielded or stored underground whenever possible to minimize the formation of 68Ge by cosmic rays, which contributes background in the double-beta decay region of interest and cannot be removed by zone refinement and crystal growth. Formation of 68Ge was reduced by a significant factor over that in natural abundance detectors not protected from cosmic rays.
Published: 2018

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

Author: Alvis, SI, Alvis, SI, Arnquist, IJ, Avignone, FT, Barabash, AS, Barton, CJ, Bertrand, FE, 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, Guiseppe, VE, Haufe, CR, Hehn, L, Henning, R, Hoppe, EW, Howe, MA, Konovalov, SI, Kouzes, RT, Lopez, AM, Martin, RD, Massarczyk, R, Meijer, SJ, Mertens, S, Myslik, J, O'Shaughnessy, C, Othman, G, Pettus, W, Poon, AWP, Radford, DC, Rager, J, Reine, AL, Rielage, K, Robertson, RGH, Ruof, NW, Shanks, B, Shirchenko, M, Suriano, AM, Tedeschi, D, Varner, RL, Vasilyev, S, Vorren, K, White, BR, Wilkerson, JF, Wiseman, C, Xu, W, Yakushev, E, Yu, C-H, Yumatov, V, Zhitnikov, I, Zhu, BX, Majorana Collaboration, Alvis, SI, Alvis, SI, Arnquist, IJ, Avignone, FT, Barabash, AS, Barton, CJ, Bertrand, FE, 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, Guiseppe, VE, Haufe, CR, Hehn, L, Henning, R, Hoppe, EW, Howe, MA, Konovalov, SI, Kouzes, RT, Lopez, AM, Martin, RD, Massarczyk, R, Meijer, SJ, Mertens, S, Myslik, J, O'Shaughnessy, C, Othman, G, Pettus, W, Poon, AWP, Radford, DC, Rager, J, Reine, AL, Rielage, K, Robertson, RGH, Ruof, NW, Shanks, B, Shirchenko, M, Suriano, AM, Tedeschi, D, Varner, RL, Vasilyev, S, Vorren, K, White, BR, Wilkerson, JF, Wiseman, C, Xu, W, Yakushev, E, Yu, C-H, Yumatov, V, Zhitnikov, I, Zhu, BX, and Majorana Collaboration
Abstract: The Majorana Demonstrator is an ultralow-background experiment searching for neutrinoless double-beta decay in ^{76}Ge. The heavily shielded array of germanium detectors, placed nearly a mile underground at the Sanford Underground Research Facility in Lead, South Dakota, also allows searches for new exotic physics. Free, relativistic, lightly ionizing particles with an electrical charge less than e are forbidden by the standard model but predicted by some of its extensions. If such particles exist, they might be detected in the Majorana Demonstrator by searching for multiple-detector events with individual-detector energy depositions down to 1 keV. This search is background-free, and no candidate events have been found in 285 days of data taking. New direct-detection limits are set for the flux of lightly ionizing particles for charges as low as e/1000.
Published: 2018

22. The processing of enriched germanium for the MAJORANA DEMONSTRATOR and R&D for a next generation double-beta decay experiment

Author: Abgrall, N, Abgrall, N, Arnquist, IJ, Avignone, FT, Barabash, AS, Bertrand, FE, Bradley, AW, Brudanin, V, Busch, M, Buuck, M, Caja, J, Caja, M, Caldwell, TS, Christofferson, CD, Chu, PH, Cuesta, C, Detwiler, JA, Dunagan, C, Dunstan, DT, Efremenko, Y, Ejiri, H, Elliott, SR, Gilliss, T, Giovanetti, GK, Goett, J, Green, MP, Gruszko, J, Guinn, IS, Guiseppe, VE, Haufe, CRS, Henning, R, Hoppe, EW, Jasinski, BR, Kidd, MF, Konovalov, SI, Kouzes, RT, Lopez, AM, MacMullin, J, Martin, RD, Massarczyk, R, Meijer, SJ, Mertens, S, Meyer, JH, Myslik, J, O'Shaughnessy, C, Poon, AWP, Radford, DC, Rager, J, Reine, AL, Reising, JA, Rielage, K, Robertson, RGH, Shanks, B, Shirchenko, M, Suriano, AM, Tedeschi, D, Toth, LM, Trimble, JE, Varner, RL, Vasilyev, S, Vetter, K, Vorren, K, White, BR, Wilkerson, JF, Wiseman, C, Xu, W, Yakushev, E, Yu, CH, Yumatov, V, Zhitnikov, I, Zhu, BX, Abgrall, N, Abgrall, N, Arnquist, IJ, Avignone, FT, Barabash, AS, Bertrand, FE, Bradley, AW, Brudanin, V, Busch, M, Buuck, M, Caja, J, Caja, M, Caldwell, TS, Christofferson, CD, Chu, PH, Cuesta, C, Detwiler, JA, Dunagan, C, Dunstan, DT, Efremenko, Y, Ejiri, H, Elliott, SR, Gilliss, T, Giovanetti, GK, Goett, J, Green, MP, Gruszko, J, Guinn, IS, Guiseppe, VE, Haufe, CRS, Henning, R, Hoppe, EW, Jasinski, BR, Kidd, MF, Konovalov, SI, Kouzes, RT, Lopez, AM, MacMullin, J, Martin, RD, Massarczyk, R, Meijer, SJ, Mertens, S, Meyer, JH, Myslik, J, O'Shaughnessy, C, Poon, AWP, Radford, DC, Rager, J, Reine, AL, Reising, JA, Rielage, K, Robertson, RGH, Shanks, B, Shirchenko, M, Suriano, AM, Tedeschi, D, Toth, LM, Trimble, JE, Varner, RL, Vasilyev, S, Vetter, K, Vorren, K, White, BR, Wilkerson, JF, Wiseman, C, Xu, W, Yakushev, E, Yu, CH, Yumatov, V, Zhitnikov, I, and Zhu, BX
Abstract: The MAJORANA DEMONSTRATOR is an array of point-contact Ge detectors fabricated from Ge isotopically enriched to 88% in 76Ge to search for neutrinoless double beta decay. The processing of Ge for germanium detectors is a well-known technology. However, because of the high cost of Ge enriched in 76Ge special procedures were required to maximize the yield of detector mass and to minimize exposure to cosmic rays. These procedures include careful accounting for the material; shielding it to reduce cosmogenic generation of radioactive isotopes; and development of special reprocessing techniques for contaminated solid germanium, shavings, grindings, acid etchant and cutting fluids from detector fabrication. Processing procedures were developed that resulted in a total yield in detector mass of 70%. However, none of the acid-etch solution and only 50% of the cutting fluids from detector fabrication were reprocessed. Had they been processed, the projections for the recovery yield would be between 80% and 85%. Maximizing yield is critical to justify a possible future ton-scale experiment. A process for recovery of germanium from the acid-etch solution was developed with yield of about 90%. All material was shielded or stored underground whenever possible to minimize the formation of 68Ge by cosmic rays, which contributes background in the double-beta decay region of interest and cannot be removed by zone refinement and crystal growth. Formation of 68Ge was reduced by a significant factor over that in natural abundance detectors not protected from cosmic rays.
Published: 2018

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

Author: Aalseth, CE, Abgrall, N, Aguayo, E, Alvis, SI, Amman, M, Arnquist, IJ, III, FTA, Back, HO, Barabash, AS, Barbeau, PS, Barton, CJ, Barton, PJ, Bertrand, FE, Bode, T, Bos, B, Boswell, M, Brodzinski, RL, Bradley, AW, Brudanin, V, Busch, M, Buuck, M, Caldwell, AS, Caldwell, TS, Chan, Y-D, Christofferson, CD, Chu, P-H, 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, Lesko, KT, LaFerriere, BD, Leon, J, Leviner, LE, Loach, JC, Lopez, AM, Luke, PN, MacMullin, J, MacMullin, S, Marino, MG, Martin, RD, Massarczyk, R, McDonald, AB, Mei, D-M, Meijer, SJ, Merriman, JH, Mertens, S, Miley, HS, Miller, ML, Myslik, J, Orrell, JL, O'Shaughnessy, C, Othman, G, Overman, NR, Pettus, W, II, DGP, Poon, AWP, Perumpilly, G, 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, C-H, Yumatov, V, Zhitnikov, I, Zhu, BX, Zimmermann, S, Aalseth, CE, Abgrall, N, Aguayo, E, Alvis, SI, Amman, M, Arnquist, IJ, III, FTA, Back, HO, Barabash, AS, Barbeau, PS, Barton, CJ, Barton, PJ, Bertrand, FE, Bode, T, Bos, B, Boswell, M, Brodzinski, RL, Bradley, AW, Brudanin, V, Busch, M, Buuck, M, Caldwell, AS, Caldwell, TS, Chan, Y-D, Christofferson, CD, Chu, P-H, 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, Lesko, KT, LaFerriere, BD, Leon, J, Leviner, LE, Loach, JC, Lopez, AM, Luke, PN, MacMullin, J, MacMullin, S, Marino, MG, Martin, RD, Massarczyk, R, McDonald, AB, Mei, D-M, Meijer, SJ, Merriman, JH, Mertens, S, Miley, HS, Miller, ML, Myslik, J, Orrell, JL, O'Shaughnessy, C, Othman, G, Overman, NR, Pettus, W, II, DGP, Poon, AWP, Perumpilly, G, 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, C-H, Yumatov, V, Zhitnikov, I, Zhu, BX, and Zimmermann, S
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).
Published: 2018

24. The Processing of Enriched Germanium for the MAJORANA DEMONSTRATOR and R&D for a Possible Future Ton-Scale Ge-76 Double-Beta Decay Experiment

Author: Abgrall, N, Arnquist, IJ, III, FTA, Barabash, AS, Bertrand, FE, Bradley, AW, Brudanin, V, Busch, M, Buuck, M, Caja, J, Caja, M, Caldwell, TS, Christofferson, CD, Chu, P-H, Cuesta, C, Detwiler, JA, Dunagan, C, Dunstan, DT, Efremenko, Y, Ejiri, H, Elliott, SR, Gilliss, T, Giovanetti, GK, Goett, J, Green, MP, Gruszko, J, Guinn, IS, Guiseppe, VE, Haufe, CRS, Henning, R, Hoppe, EW, Jasinski, BR, Kidd, MF, Konovalov, SI, Kouzes, RT, Lopez, AM, MacMullin, J, Martin, RD, Massarczyk, R, Meijer, SJ, Mertens, S, Meyer, JH, Myslik, J, O'Shaughnessy, C, Poon, AWP, Radford, DC, Rager, J, Reine, AL, Reising, JA, Rielage, K, Robertson, RGH, Shanks, B, Shirchenko, M, Suriano, AM, Tedeschi, D, Toth, LM, 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, Zhu, BX, Abgrall, N, Arnquist, IJ, III, FTA, Barabash, AS, Bertrand, FE, Bradley, AW, Brudanin, V, Busch, M, Buuck, M, Caja, J, Caja, M, Caldwell, TS, Christofferson, CD, Chu, P-H, Cuesta, C, Detwiler, JA, Dunagan, C, Dunstan, DT, Efremenko, Y, Ejiri, H, Elliott, SR, Gilliss, T, Giovanetti, GK, Goett, J, Green, MP, Gruszko, J, Guinn, IS, Guiseppe, VE, Haufe, CRS, Henning, R, Hoppe, EW, Jasinski, BR, Kidd, MF, Konovalov, SI, Kouzes, RT, Lopez, AM, MacMullin, J, Martin, RD, Massarczyk, R, Meijer, SJ, Mertens, S, Meyer, JH, Myslik, J, O'Shaughnessy, C, Poon, AWP, Radford, DC, Rager, J, Reine, AL, Reising, JA, Rielage, K, Robertson, RGH, Shanks, B, Shirchenko, M, Suriano, AM, Tedeschi, D, Toth, LM, 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
Abstract: The MAJORANA DEMONSTRATOR is an array of point-contact Ge detectors fabricated from Ge isotopically enriched to 88% in Ge-76 to search for neutrinoless double beta decay. The processing of Ge for germanium detectors is a well-known technology. However, because of the high cost of Ge enriched in Ge-76, special procedures were required to maximize the yield of detector mass and to minimize exposure to cosmic rays. These procedures include careful accounting for the material; shielding it to reduce cosmogenic generation of radioactive isotopes; and development of special reprocessing techniques for contaminated solid germanium, shavings, grindings, acid etchant and cutting fluids from detector fabrication. Processing procedures were developed that resulted in a total yield in detector mass of 70%. However, none of the acid-etch solution and only 50% of the cutting fluids from detector fabrication were reprocessed. Had they been processed, the projections for the recovery yield would be between 80 -- 85%. Maximizing yield is critical to justify a possible future ton-scale experiment. A process for recovery of germanium from the acid-etch solution was developed with yield of about 90%. All material was shielded or stored underground whenever possible to minimize the formation of Ge-68 by cosmic rays, which contributes background in the double-beta decay region of interest and cannot be removed by zone refinement and crystal growth. Formation of Ge-68 was reduced by a significant factor over that in natural abundance detectors not protected from cosmic rays.
Published: 2018

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

Author: Busch, M, 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, YD, Christofferson, CD, Chu, PH, Cuesta, C, Detwiler, JA, Dunagan, C, Efremenko, Y, Ejiri, H, Elliott, SR, Gilliss, T, Giovanetti, GK, Green, MP, Gruszko, J, Guinn, IS, Guiseppe, VE, Haufe, CR, Hehn, L, Henning, R, Hoppe, EW, Howe, MA, 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, CH, Yumatov, V, Zhitnikov, I, Zhu, BX, Busch, M, 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, YD, Christofferson, CD, Chu, PH, Cuesta, C, Detwiler, JA, Dunagan, C, Efremenko, Y, Ejiri, H, Elliott, SR, Gilliss, T, Giovanetti, GK, Green, MP, Gruszko, J, Guinn, IS, Guiseppe, VE, Haufe, CR, Hehn, L, Henning, R, Hoppe, EW, Howe, MA, 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, CH, Yumatov, V, Zhitnikov, I, and Zhu, BX
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

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

Author: Christofferson, CD, 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, YD, Chu, PH, Cuesta, C, Detwiler, JA, Dunagan, C, Efremenko, Y, Ejiri, H, Elliott, SR, Gilliss, T, Giovanetti, GK, Green, MP, Gruszko, J, Guinn, IS, Guiseppe, VE, Haufe, CR, Hehn, L, Henning, R, Hoppe, EW, Howe, MA, 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, CH, Yumatov, V, Zhitnikov, I, Zhu, BX, Christofferson, CD, 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, YD, Chu, PH, Cuesta, C, Detwiler, JA, Dunagan, C, Efremenko, Y, Ejiri, H, Elliott, SR, Gilliss, T, Giovanetti, GK, Green, MP, Gruszko, J, Guinn, IS, Guiseppe, VE, Haufe, CR, Hehn, L, Henning, R, Hoppe, EW, Howe, MA, 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, CH, Yumatov, V, Zhitnikov, I, and Zhu, BX
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

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

Author: Alvis, SI, Alvis, SI, Arnquist, IJ, Avignone, FT, Barabash, AS, Barton, CJ, Bertrand, FE, 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, Guiseppe, VE, Haufe, CR, Hehn, L, Henning, R, Hoppe, EW, Howe, MA, Konovalov, SI, Kouzes, RT, Lopez, AM, Martin, RD, Massarczyk, R, Meijer, SJ, Mertens, S, Myslik, J, O'Shaughnessy, C, Othman, G, Pettus, W, Poon, AWP, Radford, DC, Rager, J, Reine, AL, Rielage, K, Robertson, RGH, Ruof, NW, Shanks, B, Shirchenko, M, Suriano, AM, Tedeschi, D, Varner, RL, Vasilyev, S, Vorren, K, White, BR, Wilkerson, JF, Wiseman, C, Xu, W, Yakushev, E, Yu, C-H, Yumatov, V, Zhitnikov, I, Zhu, BX, Majorana Collaboration, Alvis, SI, Alvis, SI, Arnquist, IJ, Avignone, FT, Barabash, AS, Barton, CJ, Bertrand, FE, 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, Guiseppe, VE, Haufe, CR, Hehn, L, Henning, R, Hoppe, EW, Howe, MA, Konovalov, SI, Kouzes, RT, Lopez, AM, Martin, RD, Massarczyk, R, Meijer, SJ, Mertens, S, Myslik, J, O'Shaughnessy, C, Othman, G, Pettus, W, Poon, AWP, Radford, DC, Rager, J, Reine, AL, Rielage, K, Robertson, RGH, Ruof, NW, Shanks, B, Shirchenko, M, Suriano, AM, Tedeschi, D, Varner, RL, Vasilyev, S, Vorren, K, White, BR, Wilkerson, JF, Wiseman, C, Xu, W, Yakushev, E, Yu, C-H, Yumatov, V, Zhitnikov, I, Zhu, BX, and Majorana Collaboration
Abstract: The Majorana Demonstrator is an ultralow-background experiment searching for neutrinoless double-beta decay in ^{76}Ge. The heavily shielded array of germanium detectors, placed nearly a mile underground at the Sanford Underground Research Facility in Lead, South Dakota, also allows searches for new exotic physics. Free, relativistic, lightly ionizing particles with an electrical charge less than e are forbidden by the standard model but predicted by some of its extensions. If such particles exist, they might be detected in the Majorana Demonstrator by searching for multiple-detector events with individual-detector energy depositions down to 1 keV. This search is background-free, and no candidate events have been found in 285 days of data taking. New direct-detection limits are set for the flux of lightly ionizing particles for charges as low as e/1000.
Published: 2018

28. Recent results from the MAJORANA DEMONSTRATOR

Author: Myslik, J, Myslik, J, Alvis, SI, Arnquist, IJ, III, FT Avignone, Barabash, AS, Barton, CJ, Bertrand, FE, Bode, T, Bos, B, 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, Guiseppe, VE, Haufe, CR, Hegedus, RJ, Hehn, L, Henning, R, Aguilar, D Hervas, Hoppe, EW, Howe, MA, Keeter, KJ, Kidd, MF, Konovalov, SI, Kouzes, RT, Lopez, AM, Martin, RD, Massarczyk, R, Meijer, SJ, Mertens, S, 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, Vasundhara, White, BR, Wilkerson, JF, Wiseman, C, Xu, W, Yakushev, E, Yu, C-H, Yumatov, V, Zhitnikov, I, Zhu, BX, Myslik, J, Myslik, J, Alvis, SI, Arnquist, IJ, III, FT Avignone, Barabash, AS, Barton, CJ, Bertrand, FE, Bode, T, Bos, B, 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, Guiseppe, VE, Haufe, CR, Hegedus, RJ, Hehn, L, Henning, R, Aguilar, D Hervas, Hoppe, EW, Howe, MA, Keeter, KJ, Kidd, MF, Konovalov, SI, Kouzes, RT, Lopez, AM, Martin, RD, Massarczyk, R, Meijer, SJ, Mertens, S, 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, Vasundhara, White, BR, Wilkerson, JF, Wiseman, C, Xu, W, Yakushev, E, Yu, C-H, Yumatov, V, Zhitnikov, I, and Zhu, BX
Abstract: The MAJORANA DEMONSTRATOR is an experiment constructed to search for neutrinoless double-beta decay in $^{76}$Ge and to demonstrate the feasibility to deploy a large-scale experiment in a phased and modular fashion. It consists of two modules of natural and $^{76}$Ge-enriched germanium detectors totalling 44.1 kg, operating at the 4850' level of the Sanford Underground Research Facility in Lead, South Dakota, USA. Commissioning of the experiment began in June 2015, followed by data production with the full detector array in August 2016. The ultra-low background and record energy resolution achieved by the MAJORANA DEMONSTRATOR enable a sensitive neutrinoless double-beta decay search, as well as additional searches for physics beyond the Standard Model. I will discuss the design elements that enable these searches, along with the latest results, focusing on the neutrinoless double-beta decay search. I will also discuss the current status and the future plans of the MAJORANA DEMONSTRATOR, as well as the plans for a future tonne-scale $^{76}$Ge experiment.
Published: 2018

29. The processing of enriched germanium for the MAJORANA DEMONSTRATOR and R&D for a next generation double-beta decay experiment

Author: Abgrall, N, Abgrall, N, Arnquist, IJ, Avignone, FT, Barabash, AS, Bertrand, FE, Bradley, AW, Brudanin, V, Busch, M, Buuck, M, Caja, J, Caja, M, Caldwell, TS, Christofferson, CD, Chu, PH, Cuesta, C, Detwiler, JA, Dunagan, C, Dunstan, DT, Efremenko, Y, Ejiri, H, Elliott, SR, Gilliss, T, Giovanetti, GK, Goett, J, Green, MP, Gruszko, J, Guinn, IS, Guiseppe, VE, Haufe, CRS, Henning, R, Hoppe, EW, Jasinski, BR, Kidd, MF, Konovalov, SI, Kouzes, RT, Lopez, AM, MacMullin, J, Martin, RD, Massarczyk, R, Meijer, SJ, Mertens, S, Meyer, JH, Myslik, J, O'Shaughnessy, C, Poon, AWP, Radford, DC, Rager, J, Reine, AL, Reising, JA, Rielage, K, Robertson, RGH, Shanks, B, Shirchenko, M, Suriano, AM, Tedeschi, D, Toth, LM, Trimble, JE, Varner, RL, Vasilyev, S, Vetter, K, Vorren, K, White, BR, Wilkerson, JF, Wiseman, C, Xu, W, Yakushev, E, Yu, CH, Yumatov, V, Zhitnikov, I, Zhu, BX, Abgrall, N, Abgrall, N, Arnquist, IJ, Avignone, FT, Barabash, AS, Bertrand, FE, Bradley, AW, Brudanin, V, Busch, M, Buuck, M, Caja, J, Caja, M, Caldwell, TS, Christofferson, CD, Chu, PH, Cuesta, C, Detwiler, JA, Dunagan, C, Dunstan, DT, Efremenko, Y, Ejiri, H, Elliott, SR, Gilliss, T, Giovanetti, GK, Goett, J, Green, MP, Gruszko, J, Guinn, IS, Guiseppe, VE, Haufe, CRS, Henning, R, Hoppe, EW, Jasinski, BR, Kidd, MF, Konovalov, SI, Kouzes, RT, Lopez, AM, MacMullin, J, Martin, RD, Massarczyk, R, Meijer, SJ, Mertens, S, Meyer, JH, Myslik, J, O'Shaughnessy, C, Poon, AWP, Radford, DC, Rager, J, Reine, AL, Reising, JA, Rielage, K, Robertson, RGH, Shanks, B, Shirchenko, M, Suriano, AM, Tedeschi, D, Toth, LM, Trimble, JE, Varner, RL, Vasilyev, S, Vetter, K, Vorren, K, White, BR, Wilkerson, JF, Wiseman, C, Xu, W, Yakushev, E, Yu, CH, Yumatov, V, Zhitnikov, I, and Zhu, BX
Abstract: The MAJORANA DEMONSTRATOR is an array of point-contact Ge detectors fabricated from Ge isotopically enriched to 88% in 76Ge to search for neutrinoless double beta decay. The processing of Ge for germanium detectors is a well-known technology. However, because of the high cost of Ge enriched in 76Ge special procedures were required to maximize the yield of detector mass and to minimize exposure to cosmic rays. These procedures include careful accounting for the material; shielding it to reduce cosmogenic generation of radioactive isotopes; and development of special reprocessing techniques for contaminated solid germanium, shavings, grindings, acid etchant and cutting fluids from detector fabrication. Processing procedures were developed that resulted in a total yield in detector mass of 70%. However, none of the acid-etch solution and only 50% of the cutting fluids from detector fabrication were reprocessed. Had they been processed, the projections for the recovery yield would be between 80% and 85%. Maximizing yield is critical to justify a possible future ton-scale experiment. A process for recovery of germanium from the acid-etch solution was developed with yield of about 90%. All material was shielded or stored underground whenever possible to minimize the formation of 68Ge by cosmic rays, which contributes background in the double-beta decay region of interest and cannot be removed by zone refinement and crystal growth. Formation of 68Ge was reduced by a significant factor over that in natural abundance detectors not protected from cosmic rays.
Published: 2018

30. Initial Results from the Majorana Demonstrator

Author: Elliott, SR, Elliott, SR, Abgrall, N, Arnquist, IJ, Avignone, FT, Barabash, AS, Bertrand, FE, Bradley, AW, Brudanin, V, Busch, M, Buuck, M, Caldwell, TS, Chan, YD, Christofferson, CD, Chu, PH, Cuesta, C, Detwiler, JA, Dunagan, C, Efremenko, Y, Ejiri, H, Fullmer, A, Galindo-Uribarri, A, Gilliss, T, Giovanetti, GK, Green, MP, Gruszko, J, Guinn, IS, Guiseppe, VE, Henning, R, Hoppe, EW, Howe, MA, Jasinski, BR, Keeter, KJ, Kidd, MF, Konovalov, SI, Kouzes, RT, Leon, J, Lopez, AM, Macmullin, J, Martin, RD, Massarczyk, R, Meijer, SJ, Mertens, S, Orrell, JL, O'Shaughnessy, C, Poon, AWP, Radford, DC, Rager, J, Rielage, K, Robertson, RGH, Romero-Romero, E, Shanks, B, Shirchenko, M, Suriano, AM, Tedeschi, D, Trimble, JE, Varner, RL, Vasilyev, S, Vetter, K, Vorren, K, White, BR, Wilkerson, JF, Wiseman, C, Xu, W, Yakushev, E, Yu, CH, Yumatov, V, Zhitnikov, I, Elliott, SR, Elliott, SR, Abgrall, N, Arnquist, IJ, Avignone, FT, Barabash, AS, Bertrand, FE, Bradley, AW, Brudanin, V, Busch, M, Buuck, M, Caldwell, TS, Chan, YD, Christofferson, CD, Chu, PH, Cuesta, C, Detwiler, JA, Dunagan, C, Efremenko, Y, Ejiri, H, Fullmer, A, Galindo-Uribarri, A, Gilliss, T, Giovanetti, GK, Green, MP, Gruszko, J, Guinn, IS, Guiseppe, VE, Henning, R, Hoppe, EW, Howe, MA, Jasinski, BR, Keeter, KJ, Kidd, MF, Konovalov, SI, Kouzes, RT, Leon, J, Lopez, AM, Macmullin, J, Martin, RD, Massarczyk, R, Meijer, SJ, Mertens, S, Orrell, JL, O'Shaughnessy, C, Poon, AWP, Radford, DC, Rager, J, Rielage, K, Robertson, RGH, Romero-Romero, E, Shanks, B, Shirchenko, M, Suriano, AM, Tedeschi, D, Trimble, JE, Varner, RL, Vasilyev, S, Vetter, K, Vorren, K, White, BR, Wilkerson, JF, Wiseman, C, Xu, W, Yakushev, E, Yu, CH, Yumatov, V, and Zhitnikov, I
Abstract: Neutrinoless double-beta decay searches seek to determine the nature of neutrinos, the existence of a lepton violating process, and the effective Majorana neutrino mass. The Majorana Collaboration is assembling an array of high purity Ge detectors to search for neutrinoless double-beta decay in 76Ge. The Majorana Demonstrator is composed of 44.8 kg (29.7 kg enriched in 76Ge) of Ge detectors in total, split between two modules contained in a low background shield at the Sanford Underground Research Facility in Lead, South Dakota. The initial goals of the Demonstrator are to establish the required background and scalability of a Ge-based, next-generation, tonne-scale experiment. Following a commissioning run that began in 2015, the first detector module started physics data production in early 2016. We will discuss initial results of the Module 1 commissioning and first physics run, as well as the status and potential physics reach of the full Majorana Demonstrator experiment. The collaboration plans to complete the assembly of the second detector module by mid-2016 to begin full data production with the entire array.
Published: 2017

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

Author: Guiseppe, VE, 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, YD, Christofferson, CD, Chu, PH, Cuesta, C, Detwiler, JA, Dunagan, C, Efremenko, Y, Ejiri, H, Elliott, SR, Gilliss, T, Giovanetti, GK, Green, MP, Gruszko, J, Guinn, IS, 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, CH, Yumatov, V, Zhitnikov, I, Zhu, BX, Guiseppe, VE, 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, YD, Christofferson, CD, Chu, PH, Cuesta, C, Detwiler, JA, Dunagan, C, Efremenko, Y, Ejiri, H, Elliott, SR, Gilliss, T, Giovanetti, GK, Green, MP, Gruszko, J, Guinn, IS, 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, CH, Yumatov, V, Zhitnikov, I, and Zhu, BX
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

32. The MAJORANA DEMONSTRATOR calibration system

Author: Abgrall, N, Abgrall, N, Arnquist, IJ, Avignone III, FT, Barabash, AS, Bertrand, FE, Boswell, M, Bradley, AW, Brudanin, V, Busch, M, Buuck, M, Caldwell, TS, Christofferson, CD, Chu, PH, Cuesta, C, Detwiler, JA, Dunagan, C, Efremenko, Y, Ejiri, H, Elliott, SR, Fu, Z, Gehman, VM, Gilliss, T, Giovanetti, GK, Goett, J, Green, MP, Gruszko, J, Guinn, IS, Guiseppe, VE, Haufe, CR, Henning, R, Hoppe, EW, Howe, MA, Jasinski, BR, Keeter, KJ, Kidd, MF, Konovalov, SI, Kouzes, RT, Lopez, AM, MacMullin, J, Martin, RD, Massarczyk, R, Meijer, SJ, Mertens, S, Orrell, JL, O'Shaughnessy, C, Poon, AWP, Radford, DC, Rager, J, Reine, AL, Rielage, K, Robertson, RGH, Shanks, B, Shirchenko, M, Suriano, AM, Tedeschi, D, Trimble, JE, Varner, RL, Vasilyev, S, Vetter, K, Vorren, K, White, BR, Wilkerson, JF, Wiseman, C, Xu, W, Yu, CH, Yumatov, V, Zhitnikov, I, Zhu, BX, Abgrall, N, Abgrall, N, Arnquist, IJ, Avignone III, FT, Barabash, AS, Bertrand, FE, Boswell, M, Bradley, AW, Brudanin, V, Busch, M, Buuck, M, Caldwell, TS, Christofferson, CD, Chu, PH, Cuesta, C, Detwiler, JA, Dunagan, C, Efremenko, Y, Ejiri, H, Elliott, SR, Fu, Z, Gehman, VM, Gilliss, T, Giovanetti, GK, Goett, J, Green, MP, Gruszko, J, Guinn, IS, Guiseppe, VE, Haufe, CR, Henning, R, Hoppe, EW, Howe, MA, Jasinski, BR, Keeter, KJ, Kidd, MF, Konovalov, SI, Kouzes, RT, Lopez, AM, MacMullin, J, Martin, RD, Massarczyk, R, Meijer, SJ, Mertens, S, Orrell, JL, O'Shaughnessy, C, Poon, AWP, Radford, DC, Rager, J, Reine, AL, Rielage, K, Robertson, RGH, Shanks, B, Shirchenko, M, Suriano, AM, Tedeschi, D, Trimble, JE, Varner, RL, Vasilyev, S, Vetter, K, Vorren, K, White, BR, Wilkerson, JF, Wiseman, C, Xu, W, Yu, CH, Yumatov, V, Zhitnikov, I, and Zhu, BX
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 1-ton 76Ge-based search. The ultra low-background conditions require regular calibrations to verify proper function of the detectors. Radioactive line sources can be deployed around the cryostats containing the detectors for regular energy calibrations. When measuring in low-background mode, these line sources have to be stored outside the shielding so they do not contribute to the background. The deployment and the retraction of the source are designed to be controlled by the data acquisition system and do not require any direct human interaction. In this paper, we detail the design requirements and implementation of the calibration apparatus, which provides the event rates needed to define the pulse-shape cuts and energy calibration used in the final analysis as well as data that can be compared to simulations.
Published: 2017

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

Author: Guiseppe, VE, 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, YD, Christofferson, CD, Chu, PH, Cuesta, C, Detwiler, JA, Dunagan, C, Efremenko, Y, Ejiri, H, Elliott, SR, Gilliss, T, Giovanetti, GK, Green, MP, Gruszko, J, Guinn, IS, 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, CH, Yumatov, V, Zhitnikov, I, Zhu, BX, Guiseppe, VE, 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, YD, Christofferson, CD, Chu, PH, Cuesta, C, Detwiler, JA, Dunagan, C, Efremenko, Y, Ejiri, H, Elliott, SR, Gilliss, T, Giovanetti, GK, Green, MP, Gruszko, J, Guinn, IS, 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, CH, Yumatov, V, Zhitnikov, I, and Zhu, BX
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

34. The MAJORANA DEMONSTRATOR calibration system

Author: Abgrall, N, Abgrall, N, Arnquist, IJ, Avignone III, FT, Barabash, AS, Bertrand, FE, Boswell, M, Bradley, AW, Brudanin, V, Busch, M, Buuck, M, Caldwell, TS, Christofferson, CD, Chu, PH, Cuesta, C, Detwiler, JA, Dunagan, C, Efremenko, Y, Ejiri, H, Elliott, SR, Fu, Z, Gehman, VM, Gilliss, T, Giovanetti, GK, Goett, J, Green, MP, Gruszko, J, Guinn, IS, Guiseppe, VE, Haufe, CR, Henning, R, Hoppe, EW, Howe, MA, Jasinski, BR, Keeter, KJ, Kidd, MF, Konovalov, SI, Kouzes, RT, Lopez, AM, MacMullin, J, Martin, RD, Massarczyk, R, Meijer, SJ, Mertens, S, Orrell, JL, O'Shaughnessy, C, Poon, AWP, Radford, DC, Rager, J, Reine, AL, Rielage, K, Robertson, RGH, Shanks, B, Shirchenko, M, Suriano, AM, Tedeschi, D, Trimble, JE, Varner, RL, Vasilyev, S, Vetter, K, Vorren, K, White, BR, Wilkerson, JF, Wiseman, C, Xu, W, Yu, CH, Yumatov, V, Zhitnikov, I, Zhu, BX, Abgrall, N, Abgrall, N, Arnquist, IJ, Avignone III, FT, Barabash, AS, Bertrand, FE, Boswell, M, Bradley, AW, Brudanin, V, Busch, M, Buuck, M, Caldwell, TS, Christofferson, CD, Chu, PH, Cuesta, C, Detwiler, JA, Dunagan, C, Efremenko, Y, Ejiri, H, Elliott, SR, Fu, Z, Gehman, VM, Gilliss, T, Giovanetti, GK, Goett, J, Green, MP, Gruszko, J, Guinn, IS, Guiseppe, VE, Haufe, CR, Henning, R, Hoppe, EW, Howe, MA, Jasinski, BR, Keeter, KJ, Kidd, MF, Konovalov, SI, Kouzes, RT, Lopez, AM, MacMullin, J, Martin, RD, Massarczyk, R, Meijer, SJ, Mertens, S, Orrell, JL, O'Shaughnessy, C, Poon, AWP, Radford, DC, Rager, J, Reine, AL, Rielage, K, Robertson, RGH, Shanks, B, Shirchenko, M, Suriano, AM, Tedeschi, D, Trimble, JE, Varner, RL, Vasilyev, S, Vetter, K, Vorren, K, White, BR, Wilkerson, JF, Wiseman, C, Xu, W, Yu, CH, Yumatov, V, Zhitnikov, I, and Zhu, BX
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 1-ton 76Ge-based search. The ultra low-background conditions require regular calibrations to verify proper function of the detectors. Radioactive line sources can be deployed around the cryostats containing the detectors for regular energy calibrations. When measuring in low-background mode, these line sources have to be stored outside the shielding so they do not contribute to the background. The deployment and the retraction of the source are designed to be controlled by the data acquisition system and do not require any direct human interaction. In this paper, we detail the design requirements and implementation of the calibration apparatus, which provides the event rates needed to define the pulse-shape cuts and energy calibration used in the final analysis as well as data that can be compared to simulations.
Published: 2017

35. Initial Results from the Majorana Demonstrator

Author: Elliott, SR, Elliott, SR, Abgrall, N, Arnquist, IJ, Avignone, FT, Barabash, AS, Bertrand, FE, Bradley, AW, Brudanin, V, Busch, M, Buuck, M, Caldwell, TS, Chan, YD, Christofferson, CD, Chu, PH, Cuesta, C, Detwiler, JA, Dunagan, C, Efremenko, Y, Ejiri, H, Fullmer, A, Galindo-Uribarri, A, Gilliss, T, Giovanetti, GK, Green, MP, Gruszko, J, Guinn, IS, Guiseppe, VE, Henning, R, Hoppe, EW, Howe, MA, Jasinski, BR, Keeter, KJ, Kidd, MF, Konovalov, SI, Kouzes, RT, Leon, J, Lopez, AM, Macmullin, J, Martin, RD, Massarczyk, R, Meijer, SJ, Mertens, S, Orrell, JL, O'Shaughnessy, C, Poon, AWP, Radford, DC, Rager, J, Rielage, K, Robertson, RGH, Romero-Romero, E, Shanks, B, Shirchenko, M, Suriano, AM, Tedeschi, D, Trimble, JE, Varner, RL, Vasilyev, S, Vetter, K, Vorren, K, White, BR, Wilkerson, JF, Wiseman, C, Xu, W, Yakushev, E, Yu, CH, Yumatov, V, Zhitnikov, I, Elliott, SR, Elliott, SR, Abgrall, N, Arnquist, IJ, Avignone, FT, Barabash, AS, Bertrand, FE, Bradley, AW, Brudanin, V, Busch, M, Buuck, M, Caldwell, TS, Chan, YD, Christofferson, CD, Chu, PH, Cuesta, C, Detwiler, JA, Dunagan, C, Efremenko, Y, Ejiri, H, Fullmer, A, Galindo-Uribarri, A, Gilliss, T, Giovanetti, GK, Green, MP, Gruszko, J, Guinn, IS, Guiseppe, VE, Henning, R, Hoppe, EW, Howe, MA, Jasinski, BR, Keeter, KJ, Kidd, MF, Konovalov, SI, Kouzes, RT, Leon, J, Lopez, AM, Macmullin, J, Martin, RD, Massarczyk, R, Meijer, SJ, Mertens, S, Orrell, JL, O'Shaughnessy, C, Poon, AWP, Radford, DC, Rager, J, Rielage, K, Robertson, RGH, Romero-Romero, E, Shanks, B, Shirchenko, M, Suriano, AM, Tedeschi, D, Trimble, JE, Varner, RL, Vasilyev, S, Vetter, K, Vorren, K, White, BR, Wilkerson, JF, Wiseman, C, Xu, W, Yakushev, E, Yu, CH, Yumatov, V, and Zhitnikov, I
Abstract: Neutrinoless double-beta decay searches seek to determine the nature of neutrinos, the existence of a lepton violating process, and the effective Majorana neutrino mass. The Majorana Collaboration is assembling an array of high purity Ge detectors to search for neutrinoless double-beta decay in 76Ge. The Majorana Demonstrator is composed of 44.8 kg (29.7 kg enriched in 76Ge) of Ge detectors in total, split between two modules contained in a low background shield at the Sanford Underground Research Facility in Lead, South Dakota. The initial goals of the Demonstrator are to establish the required background and scalability of a Ge-based, next-generation, tonne-scale experiment. Following a commissioning run that began in 2015, the first detector module started physics data production in early 2016. We will discuss initial results of the Module 1 commissioning and first physics run, as well as the status and potential physics reach of the full Majorana Demonstrator experiment. The collaboration plans to complete the assembly of the second detector module by mid-2016 to begin full data production with the entire array.
Published: 2017

36. The Majorana Demonstrator radioassay program

Author: Abgrall, N, Abgrall, N, Arnquist, IJ, Avignone, FT, Back, HO, Barabash, AS, Bertrand, FE, Boswell, M, Bradley, AW, Brudanin, V, Busch, M, Buuck, M, Byram, D, Caldwell, AS, Chan, YD, Christofferson, CD, Chu, PH, Cuesta, C, Detwiler, JA, Dunmore, JA, Efremenko, Y, Ejiri, H, Elliott, SR, Finnerty, P, Galindo-Uribarri, A, Gehman, VM, Gilliss, T, Giovanetti, GK, Goett, J, Green, MP, Gruszko, J, Guinn, IS, Guiseppe, VE, Henning, R, Hoppe, EW, Howard, S, Howe, MA, Jasinski, BR, Johnson, RA, Keeter, KJ, Kidd, MF, Kochetov, O, Konovalov, SI, Kouzes, RT, LaFerriere, BD, Leon, J, Loach, JC, Macmullin, J, Macmullin, S, Martin, RD, Massarczyk, R, Meijer, S, Mertens, S, Miller, ML, Orrell, JL, O'Shaughnessy, C, Overman, NR, Poon, AWP, Pushkin, K, Radford, DC, Rager, J, Rielage, K, Robertson, RGH, Romero-Romero, E, Ronquest, MC, Schubert, AG, Shanks, B, Shirchenko, M, Snavely, KJ, Snyder, N, Steele, D, Suriano, AM, Tedeschi, D, Trimble, JE, Varner, RL, Vasilyev, S, Vetter, K, Vorren, K, White, BR, Wilkerson, JF, Wiseman, C, Xu, W, Yakushev, E, Yu, CH, Yumatov, V, Zhitnikov, I, Abgrall, N, Abgrall, N, Arnquist, IJ, Avignone, FT, Back, HO, Barabash, AS, Bertrand, FE, Boswell, M, Bradley, AW, Brudanin, V, Busch, M, Buuck, M, Byram, D, Caldwell, AS, Chan, YD, Christofferson, CD, Chu, PH, Cuesta, C, Detwiler, JA, Dunmore, JA, Efremenko, Y, Ejiri, H, Elliott, SR, Finnerty, P, Galindo-Uribarri, A, Gehman, VM, Gilliss, T, Giovanetti, GK, Goett, J, Green, MP, Gruszko, J, Guinn, IS, Guiseppe, VE, Henning, R, Hoppe, EW, Howard, S, Howe, MA, Jasinski, BR, Johnson, RA, Keeter, KJ, Kidd, MF, Kochetov, O, Konovalov, SI, Kouzes, RT, LaFerriere, BD, Leon, J, Loach, JC, Macmullin, J, Macmullin, S, Martin, RD, Massarczyk, R, Meijer, S, Mertens, S, Miller, ML, Orrell, JL, O'Shaughnessy, C, Overman, NR, Poon, AWP, Pushkin, K, Radford, DC, Rager, J, Rielage, K, Robertson, RGH, Romero-Romero, E, Ronquest, MC, Schubert, AG, Shanks, B, Shirchenko, M, Snavely, KJ, Snyder, N, Steele, D, Suriano, AM, Tedeschi, D, Trimble, JE, Varner, RL, Vasilyev, S, Vetter, K, Vorren, K, White, BR, Wilkerson, JF, Wiseman, C, Xu, W, Yakushev, E, Yu, CH, Yumatov, V, and Zhitnikov, I
Abstract: The Majorana collaboration is constructing the Majorana Demonstrator at the Sanford Underground Research Facility at the Homestake gold mine, in Lead, SD. The apparatus will use Ge detectors, enriched in isotope 76Ge, to demonstrate the feasibility of a large-scale Ge detector experiment to search for neutrinoless double beta decay. The long half-life of this postulated process requires that the apparatus be extremely low in radioactive isotopes whose decays may produce backgrounds to the search. The radioassay program conducted by the collaboration to ensure that the materials comprising the apparatus are sufficiently pure is described. The resulting measurements from gamma-ray counting, neutron activation and mass spectroscopy of the radioactive-isotope contamination for the materials studied for use in the detector are reported. We interpret these numbers in the context of the expected background for the experiment.
Published: 2016

37. High voltage testing for the Majorana Demonstrator

Author: Abgrall, N, Abgrall, N, Arnquist, IJ, Avignone, FT, Barabash, AS, Bertrand, FE, Bradley, AW, Brudanin, V, Busch, M, Buuck, M, Byram, D, Caldwell, AS, Chan, YD, Christofferson, CD, Chu, PH, Cuesta, C, Detwiler, JA, Doe, PJ, Dunagan, C, Efremenko, Y, Ejiri, H, Elliott, SR, Fu, Z, Galindo-Uribarri, A, 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, Li, A, 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, Thompson, A, Ton, KT, Trimble, JE, Varner, RL, Vasilyev, S, Vetter, K, Vorren, K, White, BR, Wilkerson, JF, Wiseman, C, Xu, W, Yakushev, E, Yu, CH, Yumatov, V, Abgrall, N, Abgrall, N, Arnquist, IJ, Avignone, FT, Barabash, AS, Bertrand, FE, Bradley, AW, Brudanin, V, Busch, M, Buuck, M, Byram, D, Caldwell, AS, Chan, YD, Christofferson, CD, Chu, PH, Cuesta, C, Detwiler, JA, Doe, PJ, Dunagan, C, Efremenko, Y, Ejiri, H, Elliott, SR, Fu, Z, Galindo-Uribarri, A, 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, Li, A, 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, Thompson, A, Ton, KT, Trimble, JE, Varner, RL, Vasilyev, S, Vetter, K, Vorren, K, White, BR, Wilkerson, JF, Wiseman, C, Xu, W, Yakushev, E, Yu, CH, and Yumatov, V
Abstract: The Majorana Collaboration is constructing the Majorana Demonstrator, an ultra-low background, 44-kg modular high-purity Ge (HPGe) detector array to search for neutrinoless double-beta decay in 76Ge. The phenomenon of surface micro-discharge induced by high-voltage has been studied in the context of the Majorana Demonstrator. This effect can damage the front-end electronics or mimic detector signals. To ensure the correct performance, every high-voltage cable and feedthrough must be capable of supplying HPGe detector operating voltages as high as 5 kV without exhibiting discharge. R&D measurements were carried out to understand the testing system and determine the optimum design configuration of the high-voltage path, including different improvements of the cable layout and feedthrough flange model selection. Every cable and feedthrough to be used at the Majorana Demonstrator was characterized and the micro-discharge effects during the Majorana Demonstrator commissioning phase were studied. A stable configuration has been achieved, and the cables and connectors can supply HPGe detector operating voltages without exhibiting discharge.
Published: 2016

38. High voltage testing for the Majorana Demonstrator

Author: Abgrall, N, Abgrall, N, Arnquist, IJ, Avignone, FT, Barabash, AS, Bertrand, FE, Bradley, AW, Brudanin, V, Busch, M, Buuck, M, Byram, D, Caldwell, AS, Chan, YD, Christofferson, CD, Chu, PH, Cuesta, C, Detwiler, JA, Doe, PJ, Dunagan, C, Efremenko, Y, Ejiri, H, Elliott, SR, Fu, Z, Galindo-Uribarri, A, 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, Li, A, 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, Thompson, A, Ton, KT, Trimble, JE, Varner, RL, Vasilyev, S, Vetter, K, Vorren, K, White, BR, Wilkerson, JF, Wiseman, C, Xu, W, Yakushev, E, Yu, CH, Yumatov, V, Abgrall, N, Abgrall, N, Arnquist, IJ, Avignone, FT, Barabash, AS, Bertrand, FE, Bradley, AW, Brudanin, V, Busch, M, Buuck, M, Byram, D, Caldwell, AS, Chan, YD, Christofferson, CD, Chu, PH, Cuesta, C, Detwiler, JA, Doe, PJ, Dunagan, C, Efremenko, Y, Ejiri, H, Elliott, SR, Fu, Z, Galindo-Uribarri, A, 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, Li, A, 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, Thompson, A, Ton, KT, Trimble, JE, Varner, RL, Vasilyev, S, Vetter, K, Vorren, K, White, BR, Wilkerson, JF, Wiseman, C, Xu, W, Yakushev, E, Yu, CH, and Yumatov, V
Abstract: The Majorana Collaboration is constructing the Majorana Demonstrator, an ultra-low background, 44-kg modular high-purity Ge (HPGe) detector array to search for neutrinoless double-beta decay in 76Ge. The phenomenon of surface micro-discharge induced by high-voltage has been studied in the context of the Majorana Demonstrator. This effect can damage the front-end electronics or mimic detector signals. To ensure the correct performance, every high-voltage cable and feedthrough must be capable of supplying HPGe detector operating voltages as high as 5 kV without exhibiting discharge. R&D measurements were carried out to understand the testing system and determine the optimum design configuration of the high-voltage path, including different improvements of the cable layout and feedthrough flange model selection. Every cable and feedthrough to be used at the Majorana Demonstrator was characterized and the micro-discharge effects during the Majorana Demonstrator commissioning phase were studied. A stable configuration has been achieved, and the cables and connectors can supply HPGe detector operating voltages without exhibiting discharge.
Published: 2016

39. The Majorana Demonstrator radioassay program

Author: Abgrall, N, Abgrall, N, Arnquist, IJ, Avignone, FT, Back, HO, Barabash, AS, Bertrand, FE, Boswell, M, Bradley, AW, Brudanin, V, Busch, M, Buuck, M, Byram, D, Caldwell, AS, Chan, YD, Christofferson, CD, Chu, PH, Cuesta, C, Detwiler, JA, Dunmore, JA, Efremenko, Y, Ejiri, H, Elliott, SR, Finnerty, P, Galindo-Uribarri, A, Gehman, VM, Gilliss, T, Giovanetti, GK, Goett, J, Green, MP, Gruszko, J, Guinn, IS, Guiseppe, VE, Henning, R, Hoppe, EW, Howard, S, Howe, MA, Jasinski, BR, Johnson, RA, Keeter, KJ, Kidd, MF, Kochetov, O, Konovalov, SI, Kouzes, RT, LaFerriere, BD, Leon, J, Loach, JC, Macmullin, J, Macmullin, S, Martin, RD, Massarczyk, R, Meijer, S, Mertens, S, Miller, ML, Orrell, JL, O'Shaughnessy, C, Overman, NR, Poon, AWP, Pushkin, K, Radford, DC, Rager, J, Rielage, K, Robertson, RGH, Romero-Romero, E, Ronquest, MC, Schubert, AG, Shanks, B, Shirchenko, M, Snavely, KJ, Snyder, N, Steele, D, Suriano, AM, Tedeschi, D, Trimble, JE, Varner, RL, Vasilyev, S, Vetter, K, Vorren, K, White, BR, Wilkerson, JF, Wiseman, C, Xu, W, Yakushev, E, Yu, CH, Yumatov, V, Zhitnikov, I, Abgrall, N, Abgrall, N, Arnquist, IJ, Avignone, FT, Back, HO, Barabash, AS, Bertrand, FE, Boswell, M, Bradley, AW, Brudanin, V, Busch, M, Buuck, M, Byram, D, Caldwell, AS, Chan, YD, Christofferson, CD, Chu, PH, Cuesta, C, Detwiler, JA, Dunmore, JA, Efremenko, Y, Ejiri, H, Elliott, SR, Finnerty, P, Galindo-Uribarri, A, Gehman, VM, Gilliss, T, Giovanetti, GK, Goett, J, Green, MP, Gruszko, J, Guinn, IS, Guiseppe, VE, Henning, R, Hoppe, EW, Howard, S, Howe, MA, Jasinski, BR, Johnson, RA, Keeter, KJ, Kidd, MF, Kochetov, O, Konovalov, SI, Kouzes, RT, LaFerriere, BD, Leon, J, Loach, JC, Macmullin, J, Macmullin, S, Martin, RD, Massarczyk, R, Meijer, S, Mertens, S, Miller, ML, Orrell, JL, O'Shaughnessy, C, Overman, NR, Poon, AWP, Pushkin, K, Radford, DC, Rager, J, Rielage, K, Robertson, RGH, Romero-Romero, E, Ronquest, MC, Schubert, AG, Shanks, B, Shirchenko, M, Snavely, KJ, Snyder, N, Steele, D, Suriano, AM, Tedeschi, D, Trimble, JE, Varner, RL, Vasilyev, S, Vetter, K, Vorren, K, White, BR, Wilkerson, JF, Wiseman, C, Xu, W, Yakushev, E, Yu, CH, Yumatov, V, and Zhitnikov, I
Abstract: The Majorana collaboration is constructing the Majorana Demonstrator at the Sanford Underground Research Facility at the Homestake gold mine, in Lead, SD. The apparatus will use Ge detectors, enriched in isotope 76Ge, to demonstrate the feasibility of a large-scale Ge detector experiment to search for neutrinoless double beta decay. The long half-life of this postulated process requires that the apparatus be extremely low in radioactive isotopes whose decays may produce backgrounds to the search. The radioassay program conducted by the collaboration to ensure that the materials comprising the apparatus are sufficiently pure is described. The resulting measurements from gamma-ray counting, neutron activation and mass spectroscopy of the radioactive-isotope contamination for the materials studied for use in the detector are reported. We interpret these numbers in the context of the expected background for the experiment.
Published: 2016

40. The Majorana Parts Tracking Database

Author: Collaboration, The Majorana, Collaboration, The Majorana, Abgrall, N, Aguayo, E, III, FT Avignone, Barabash, AS, Bertrand, FE, Brudanin, V, Busch, M, Byram, D, Caldwell, AS, Chan, Y-D, Christofferson, CD, Combs, DC, Cuesta, C, Detwiler, JA, Doe, PJ, Efremenko, Yu, Egorov, V, Ejiri, H, Elliott, SR, Esterline, J, Fast, JE, Finnerty, P, Fraenkle, FM, Galindo-Uribarri, A, Giovanetti, GK, Goett, J, Green, MP, Gruszko, J, Guiseppe, VE, Gusev, K, Hallin, AL, Hazama, R, Hegai, A, Henning, R, Hoppe, EW, Howard, S, Howe, MA, Keeter, KJ, Kidd, MF, Kochetov, O, Konovalov, SI, Kouzes, RT, LaFerriere, BD, Leon, J Diaz, Leviner, LE, Loach, JC, MacMullin, J, Martin, RD, Meijer, SJ, Mertens, S, Miller, ML, Mizouni, L, Nomachi, M, Orrell, JL, O'Shaughnessy, C, Overman, NR, Petersburg, R, II, DG Phillips, Poon, AWP, Pushkin, K, Radford, DC, Rager, J, Rielage, K, Robertson, RGH, Romero-Romero, E, Ronquest, MC, Shanks, B, Shima, T, Shirchenko, M, Snavely, KJ, Snyder, N, Soin, A, Suriano, AM, Tedeschi, D, Thompson, J, Timkin, V, Tornow, W, Trimble, JE, Varner, RL, Vasilyev, S, Vetter, K, Vorren, K, White, BR, Wilkerson, JF, Wiseman, C, Xu, W, Yakushev, E, Young, AR, Yu, C-H, Yumatov, V, Zhitnikov, I, Collaboration, The Majorana, Collaboration, The Majorana, Abgrall, N, Aguayo, E, III, FT Avignone, Barabash, AS, Bertrand, FE, Brudanin, V, Busch, M, Byram, D, Caldwell, AS, Chan, Y-D, Christofferson, CD, Combs, DC, Cuesta, C, Detwiler, JA, Doe, PJ, Efremenko, Yu, Egorov, V, Ejiri, H, Elliott, SR, Esterline, J, Fast, JE, Finnerty, P, Fraenkle, FM, Galindo-Uribarri, A, Giovanetti, GK, Goett, J, Green, MP, Gruszko, J, Guiseppe, VE, Gusev, K, Hallin, AL, Hazama, R, Hegai, A, Henning, R, Hoppe, EW, Howard, S, Howe, MA, Keeter, KJ, Kidd, MF, Kochetov, O, Konovalov, SI, Kouzes, RT, LaFerriere, BD, Leon, J Diaz, Leviner, LE, Loach, JC, MacMullin, J, Martin, RD, Meijer, SJ, Mertens, S, Miller, ML, Mizouni, L, Nomachi, M, Orrell, JL, O'Shaughnessy, C, Overman, NR, Petersburg, R, II, DG Phillips, Poon, AWP, Pushkin, K, Radford, DC, Rager, J, Rielage, K, Robertson, RGH, Romero-Romero, E, Ronquest, MC, Shanks, B, Shima, T, Shirchenko, M, Snavely, KJ, Snyder, N, Soin, A, Suriano, AM, Tedeschi, D, Thompson, J, Timkin, V, Tornow, W, Trimble, JE, Varner, RL, Vasilyev, S, Vetter, K, Vorren, K, White, BR, Wilkerson, JF, Wiseman, C, Xu, W, Yakushev, E, Young, AR, Yu, C-H, Yumatov, V, and Zhitnikov, I
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

41. The Majorana Parts Tracking Database

Author: Collaboration, The Majorana, Collaboration, The Majorana, Abgrall, N, Aguayo, E, III, FT Avignone, Barabash, AS, Bertrand, FE, Brudanin, V, Busch, M, Byram, D, Caldwell, AS, Chan, Y-D, Christofferson, CD, Combs, DC, Cuesta, C, Detwiler, JA, Doe, PJ, Efremenko, Yu, Egorov, V, Ejiri, H, Elliott, SR, Esterline, J, Fast, JE, Finnerty, P, Fraenkle, FM, Galindo-Uribarri, A, Giovanetti, GK, Goett, J, Green, MP, Gruszko, J, Guiseppe, VE, Gusev, K, Hallin, AL, Hazama, R, Hegai, A, Henning, R, Hoppe, EW, Howard, S, Howe, MA, Keeter, KJ, Kidd, MF, Kochetov, O, Konovalov, SI, Kouzes, RT, LaFerriere, BD, Leon, J Diaz, Leviner, LE, Loach, JC, MacMullin, J, Martin, RD, Meijer, SJ, Mertens, S, Miller, ML, Mizouni, L, Nomachi, M, Orrell, JL, O'Shaughnessy, C, Overman, NR, Petersburg, R, II, DG Phillips, Poon, AWP, Pushkin, K, Radford, DC, Rager, J, Rielage, K, Robertson, RGH, Romero-Romero, E, Ronquest, MC, Shanks, B, Shima, T, Shirchenko, M, Snavely, KJ, Snyder, N, Soin, A, Suriano, AM, Tedeschi, D, Thompson, J, Timkin, V, Tornow, W, Trimble, JE, Varner, RL, Vasilyev, S, Vetter, K, Vorren, K, White, BR, Wilkerson, JF, Wiseman, C, Xu, W, Yakushev, E, Young, AR, Yu, C-H, Yumatov, V, Zhitnikov, I, Collaboration, The Majorana, Collaboration, The Majorana, Abgrall, N, Aguayo, E, III, FT Avignone, Barabash, AS, Bertrand, FE, Brudanin, V, Busch, M, Byram, D, Caldwell, AS, Chan, Y-D, Christofferson, CD, Combs, DC, Cuesta, C, Detwiler, JA, Doe, PJ, Efremenko, Yu, Egorov, V, Ejiri, H, Elliott, SR, Esterline, J, Fast, JE, Finnerty, P, Fraenkle, FM, Galindo-Uribarri, A, Giovanetti, GK, Goett, J, Green, MP, Gruszko, J, Guiseppe, VE, Gusev, K, Hallin, AL, Hazama, R, Hegai, A, Henning, R, Hoppe, EW, Howard, S, Howe, MA, Keeter, KJ, Kidd, MF, Kochetov, O, Konovalov, SI, Kouzes, RT, LaFerriere, BD, Leon, J Diaz, Leviner, LE, Loach, JC, MacMullin, J, Martin, RD, Meijer, SJ, Mertens, S, Miller, ML, Mizouni, L, Nomachi, M, Orrell, JL, O'Shaughnessy, C, Overman, NR, Petersburg, R, II, DG Phillips, Poon, AWP, Pushkin, K, Radford, DC, Rager, J, Rielage, K, Robertson, RGH, Romero-Romero, E, Ronquest, MC, Shanks, B, Shima, T, Shirchenko, M, Snavely, KJ, Snyder, N, Soin, A, Suriano, AM, Tedeschi, D, Thompson, J, Timkin, V, Tornow, W, Trimble, JE, Varner, RL, Vasilyev, S, Vetter, K, Vorren, K, White, BR, Wilkerson, JF, Wiseman, C, Xu, W, Yakushev, E, Young, AR, Yu, C-H, Yumatov, V, and Zhitnikov, I
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

42. Status of the Majorana Demonstrator

Author: Cuesta, C, 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, Zhitnikov, I, Cuesta, C, 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
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

43. Background Model for the Majorana Demonstrator

Author: Cuesta, C, Cuesta, C, Abgrall, N, Aguayo, E, III, FT Avignone, Barabash, AS, Bertrand, FE, Boswell, M, Brudanin, V, Busch, M, Byram, D, Caldwell, AS, Chan, Y-D, Christofferson, CD, Combs, DC, Detwiler, JA, Doe, PJ, Efremenko, Yu, Egorov, V, Ejiri, H, Elliott, SR, Fast, JE, Finnerty, P, Fraenkle, FM, Galindo-Uribarri, A, Giovanetti, GK, Goett, J, Green, MP, Gruszko, J, Guiseppe, VE, Gusev, K, Hallin, AL, Hazama, R, Hegai, A, Henning, R, Hoppe, EW, Howard, S, Howe, MA, Keeter, KJ, Kidd, MF, Kochetov, O, Konovalov, SI, Kouzes, RT, LaFerriere, BD, Leon, J, Leviner, LE, Loach, JC, MacMullin, J, MacMullin, S, Martin, RD, Meijer, S, Mertens, S, Nomachi, M, Orrell, JL, O'Shaughnessy, C, Overman, NR, II, DG Phillips, Poon, AWP, Pushkin, K, Radford, DC, Rager, J, Rielage, K, Robertson, RGH, Romero-Romero, E, Ronquest, MC, Schubert, AG, Shanks, B, Shima, T, Shirchenko, M, Snavely, KJ, Snyder, N, Suriano, AM, Thompson, J, Timkin, V, Tornow, W, Trimble, JE, Varner, RL, Vasilyev, S, Vetter, K, Vorren, K, White, BR, Wilkerson, JF, Wiseman, C, Xu, W, Yakushev, E, Young, AR, Yu, CH, Yumatov, V, Cuesta, C, Cuesta, C, Abgrall, N, Aguayo, E, III, FT Avignone, Barabash, AS, Bertrand, FE, Boswell, M, Brudanin, V, Busch, M, Byram, D, Caldwell, AS, Chan, Y-D, Christofferson, CD, Combs, DC, Detwiler, JA, Doe, PJ, Efremenko, Yu, Egorov, V, Ejiri, H, Elliott, SR, Fast, JE, Finnerty, P, Fraenkle, FM, Galindo-Uribarri, A, Giovanetti, GK, Goett, J, Green, MP, Gruszko, J, Guiseppe, VE, Gusev, K, Hallin, AL, Hazama, R, Hegai, A, Henning, R, Hoppe, EW, Howard, S, Howe, MA, Keeter, KJ, Kidd, MF, Kochetov, O, Konovalov, SI, Kouzes, RT, LaFerriere, BD, Leon, J, Leviner, LE, Loach, JC, MacMullin, J, MacMullin, S, Martin, RD, Meijer, S, Mertens, S, Nomachi, M, Orrell, JL, O'Shaughnessy, C, Overman, NR, II, DG Phillips, Poon, AWP, Pushkin, K, Radford, DC, Rager, J, Rielage, K, Robertson, RGH, Romero-Romero, E, Ronquest, MC, Schubert, AG, Shanks, B, Shima, T, Shirchenko, M, Snavely, KJ, Snyder, N, Suriano, AM, Thompson, J, Timkin, V, Tornow, W, Trimble, JE, Varner, RL, Vasilyev, S, Vetter, K, Vorren, K, White, BR, Wilkerson, JF, Wiseman, C, Xu, W, Yakushev, E, Young, AR, Yu, CH, and Yumatov, V
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.
Published: 2014

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

Author: Abgrall, N, Abgrall, N, Aguayo, E, III, FT Avignone, Barabash, AS, Bertrand, FE, Boswell, M, Brudanin, V, Busch, M, Caldwell, AS, Chan, Y-D, Christofferson, CD, Combs, DC, Cooper, RJ, Creswick, RJ, Detwiler, JA, Doe, PJ, Efremenko, Yu, Egorov, V, Elliott, SR, Fast, JE, Finnerty, P, Fraenkle, FM, Galindo-Uribarri, A, Giovanetti, GK, Goett, J, Green, MP, Gruszko, J, Guiseppe, VE, Gusev, K, Hegai, A, Henning, R, Hoppe, EW, Howard, S, Howe, MA, Keeter, KJ, Kidd, MF, Knecht, A, Kochetov, O, Konovalov, SI, Kouzes, RT, LaFerriere, BD, Leon, J, Leviner, LE, Loach, JC, MacMullin, J, MacMullin, S, Marino, MG, Martin, RD, Mertens, S, Orrell, JL, O'Shaughnessy, C, Overman, NR, II, DG Phillips, Poon, AWP, Pushkin, K, Radford, DC, Rielage, K, Robertson, RGH, Ronquest, MC, Schubert, AG, Shanks, B, Shirchenko, M, Snavely, KJ, Snyder, N, Steele, D, Suriano, AM, Thompson, J, Timkin, V, Varner, RL, Vasilyev, S, Vetter, K, Vorren, K, White, BR, Wilkerson, JF, Xu, W, Yakushev, E, Young, AR, Yu, CH, Yumatov, V, Abgrall, N, Abgrall, N, Aguayo, E, III, FT Avignone, Barabash, AS, Bertrand, FE, Boswell, M, Brudanin, V, Busch, M, Caldwell, AS, Chan, Y-D, Christofferson, CD, Combs, DC, Cooper, RJ, Creswick, RJ, Detwiler, JA, Doe, PJ, Efremenko, Yu, Egorov, V, Elliott, SR, Fast, JE, Finnerty, P, Fraenkle, FM, Galindo-Uribarri, A, Giovanetti, GK, Goett, J, Green, MP, Gruszko, J, Guiseppe, VE, Gusev, K, Hegai, A, Henning, R, Hoppe, EW, Howard, S, Howe, MA, Keeter, KJ, Kidd, MF, Knecht, A, Kochetov, O, Konovalov, SI, Kouzes, RT, LaFerriere, BD, Leon, J, Leviner, LE, Loach, JC, MacMullin, J, MacMullin, S, Marino, MG, Martin, RD, Mertens, S, Orrell, JL, O'Shaughnessy, C, Overman, NR, II, DG Phillips, Poon, AWP, Pushkin, K, Radford, DC, Rielage, K, Robertson, RGH, Ronquest, MC, Schubert, AG, Shanks, B, Shirchenko, M, Snavely, KJ, Snyder, N, Steele, D, Suriano, AM, Thompson, J, Timkin, V, Varner, RL, Vasilyev, S, Vetter, K, Vorren, K, White, BR, Wilkerson, JF, Xu, W, Yakushev, E, Young, AR, Yu, CH, and Yumatov, V
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.
Published: 2014

45. Background Model for the Majorana Demonstrator

Author: Cuesta, C, Cuesta, C, Abgrall, N, Aguayo, E, III, FT Avignone, Barabash, AS, Bertrand, FE, Boswell, M, Brudanin, V, Busch, M, Byram, D, Caldwell, AS, Chan, Y-D, Christofferson, CD, Combs, DC, Detwiler, JA, Doe, PJ, Efremenko, Yu, Egorov, V, Ejiri, H, Elliott, SR, Fast, JE, Finnerty, P, Fraenkle, FM, Galindo-Uribarri, A, Giovanetti, GK, Goett, J, Green, MP, Gruszko, J, Guiseppe, VE, Gusev, K, Hallin, AL, Hazama, R, Hegai, A, Henning, R, Hoppe, EW, Howard, S, Howe, MA, Keeter, KJ, Kidd, MF, Kochetov, O, Konovalov, SI, Kouzes, RT, LaFerriere, BD, Leon, J, Leviner, LE, Loach, JC, MacMullin, J, MacMullin, S, Martin, RD, Meijer, S, Mertens, S, Nomachi, M, Orrell, JL, O'Shaughnessy, C, Overman, NR, II, DG Phillips, Poon, AWP, Pushkin, K, Radford, DC, Rager, J, Rielage, K, Robertson, RGH, Romero-Romero, E, Ronquest, MC, Schubert, AG, Shanks, B, Shima, T, Shirchenko, M, Snavely, KJ, Snyder, N, Suriano, AM, Thompson, J, Timkin, V, Tornow, W, Trimble, JE, Varner, RL, Vasilyev, S, Vetter, K, Vorren, K, White, BR, Wilkerson, JF, Wiseman, C, Xu, W, Yakushev, E, Young, AR, Yu, CH, Yumatov, V, Cuesta, C, Cuesta, C, Abgrall, N, Aguayo, E, III, FT Avignone, Barabash, AS, Bertrand, FE, Boswell, M, Brudanin, V, Busch, M, Byram, D, Caldwell, AS, Chan, Y-D, Christofferson, CD, Combs, DC, Detwiler, JA, Doe, PJ, Efremenko, Yu, Egorov, V, Ejiri, H, Elliott, SR, Fast, JE, Finnerty, P, Fraenkle, FM, Galindo-Uribarri, A, Giovanetti, GK, Goett, J, Green, MP, Gruszko, J, Guiseppe, VE, Gusev, K, Hallin, AL, Hazama, R, Hegai, A, Henning, R, Hoppe, EW, Howard, S, Howe, MA, Keeter, KJ, Kidd, MF, Kochetov, O, Konovalov, SI, Kouzes, RT, LaFerriere, BD, Leon, J, Leviner, LE, Loach, JC, MacMullin, J, MacMullin, S, Martin, RD, Meijer, S, Mertens, S, Nomachi, M, Orrell, JL, O'Shaughnessy, C, Overman, NR, II, DG Phillips, Poon, AWP, Pushkin, K, Radford, DC, Rager, J, Rielage, K, Robertson, RGH, Romero-Romero, E, Ronquest, MC, Schubert, AG, Shanks, B, Shima, T, Shirchenko, M, Snavely, KJ, Snyder, N, Suriano, AM, Thompson, J, Timkin, V, Tornow, W, Trimble, JE, Varner, RL, Vasilyev, S, Vetter, K, Vorren, K, White, BR, Wilkerson, JF, Wiseman, C, Xu, W, Yakushev, E, Young, AR, Yu, CH, and Yumatov, V
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.
Published: 2014

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

Author: Abgrall, N, Abgrall, N, Aguayo, E, III, FT Avignone, Barabash, AS, Bertrand, FE, Boswell, M, Brudanin, V, Busch, M, Caldwell, AS, Chan, Y-D, Christofferson, CD, Combs, DC, Cooper, RJ, Creswick, RJ, Detwiler, JA, Doe, PJ, Efremenko, Yu, Egorov, V, Elliott, SR, Fast, JE, Finnerty, P, Fraenkle, FM, Galindo-Uribarri, A, Giovanetti, GK, Goett, J, Green, MP, Gruszko, J, Guiseppe, VE, Gusev, K, Hegai, A, Henning, R, Hoppe, EW, Howard, S, Howe, MA, Keeter, KJ, Kidd, MF, Knecht, A, Kochetov, O, Konovalov, SI, Kouzes, RT, LaFerriere, BD, Leon, J, Leviner, LE, Loach, JC, MacMullin, J, MacMullin, S, Marino, MG, Martin, RD, Mertens, S, Orrell, JL, O'Shaughnessy, C, Overman, NR, II, DG Phillips, Poon, AWP, Pushkin, K, Radford, DC, Rielage, K, Robertson, RGH, Ronquest, MC, Schubert, AG, Shanks, B, Shirchenko, M, Snavely, KJ, Snyder, N, Steele, D, Suriano, AM, Thompson, J, Timkin, V, Varner, RL, Vasilyev, S, Vetter, K, Vorren, K, White, BR, Wilkerson, JF, Xu, W, Yakushev, E, Young, AR, Yu, CH, Yumatov, V, Abgrall, N, Abgrall, N, Aguayo, E, III, FT Avignone, Barabash, AS, Bertrand, FE, Boswell, M, Brudanin, V, Busch, M, Caldwell, AS, Chan, Y-D, Christofferson, CD, Combs, DC, Cooper, RJ, Creswick, RJ, Detwiler, JA, Doe, PJ, Efremenko, Yu, Egorov, V, Elliott, SR, Fast, JE, Finnerty, P, Fraenkle, FM, Galindo-Uribarri, A, Giovanetti, GK, Goett, J, Green, MP, Gruszko, J, Guiseppe, VE, Gusev, K, Hegai, A, Henning, R, Hoppe, EW, Howard, S, Howe, MA, Keeter, KJ, Kidd, MF, Knecht, A, Kochetov, O, Konovalov, SI, Kouzes, RT, LaFerriere, BD, Leon, J, Leviner, LE, Loach, JC, MacMullin, J, MacMullin, S, Marino, MG, Martin, RD, Mertens, S, Orrell, JL, O'Shaughnessy, C, Overman, NR, II, DG Phillips, Poon, AWP, Pushkin, K, Radford, DC, Rielage, K, Robertson, RGH, Ronquest, MC, Schubert, AG, Shanks, B, Shirchenko, M, Snavely, KJ, Snyder, N, Steele, D, Suriano, AM, Thompson, J, Timkin, V, Varner, RL, Vasilyev, S, Vetter, K, Vorren, K, White, BR, Wilkerson, JF, Xu, W, Yakushev, E, Young, AR, Yu, CH, and Yumatov, V
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.
Published: 2014

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

Author: Collaboration, Majorana, Collaboration, Majorana, Abgrall, N, Aguayo, E, III, FT Avignone, Barabash, AS, Bertrand, FE, Boswell, M, Brudanin, V, Busch, M, Caldwell, AS, Chan, Y-D, Christofferson, CD, Combs, DC, Detwiler, JA, Doe, PJ, Efremenko, Yu, Egorov, V, Ejiri, H, Elliott, SR, Esterline, J, Fast, JE, Finnerty, P, Fraenkle, FM, Galindo-Uribarri, A, Giovanetti, GK, Goett, J, Green, MP, Gruszko, J, Guiseppe, VE, Gusey, K, Hallin, AL, Hazama, R, Hegai, A, Henning, R, Hoppe, EW, Howard, S, Howe, MA, Keeter, KJ, Kidd, MF, Knecht, A, Kochetov, O, Konovalov, SI, Kouzes, RT, LaFerriere, BD, Leon, J, Leviner, LE, Loach, JC, MacMullin, S, Martin, RD, Mertens, S, Mizouni, L, Nomachi, M, Orrell, JL, O'Shaughnessy, C, Overman, NR, II, DG Phillips, Poon, AWP, Pushkin, K, Radford, DC, Rielage, K, Robertson, RGH, Ronquest, MC, Schubert, AG, Shanks, B, Shima, T, Shirchenko, M, Snavely, KJ, Snyder, N, Steele, D, Strain, J, Suriano, AM, Thompson, J, Timkin, V, Tornow, W, Varner, RL, Vasilyev, S, Vetter, K, Vorren, K, White, BR, Wilkerson, JF, Xu, W, Yakushev, E, Young, AR, Yu, C-H, Yumatov, V, Collaboration, Majorana, Collaboration, Majorana, Abgrall, N, Aguayo, E, III, FT Avignone, Barabash, AS, Bertrand, FE, Boswell, M, Brudanin, V, Busch, M, Caldwell, AS, Chan, Y-D, Christofferson, CD, Combs, DC, Detwiler, JA, Doe, PJ, Efremenko, Yu, Egorov, V, Ejiri, H, Elliott, SR, Esterline, J, Fast, JE, Finnerty, P, Fraenkle, FM, Galindo-Uribarri, A, Giovanetti, GK, Goett, J, Green, MP, Gruszko, J, Guiseppe, VE, Gusey, K, Hallin, AL, Hazama, R, Hegai, A, Henning, R, Hoppe, EW, Howard, S, Howe, MA, Keeter, KJ, Kidd, MF, Knecht, A, Kochetov, O, Konovalov, SI, Kouzes, RT, LaFerriere, BD, Leon, J, Leviner, LE, Loach, JC, MacMullin, S, Martin, RD, Mertens, S, Mizouni, L, Nomachi, M, Orrell, JL, O'Shaughnessy, C, Overman, NR, II, DG Phillips, Poon, AWP, Pushkin, K, Radford, DC, Rielage, K, Robertson, RGH, Ronquest, MC, Schubert, AG, Shanks, B, Shima, T, Shirchenko, M, Snavely, KJ, Snyder, N, Steele, D, Strain, J, Suriano, AM, Thompson, J, Timkin, V, Tornow, W, Varner, RL, Vasilyev, S, Vetter, K, Vorren, K, White, BR, Wilkerson, JF, Xu, W, Yakushev, E, Young, AR, Yu, C-H, and Yumatov, V
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.
Published: 2013

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

Author: Collaboration, Majorana, Collaboration, Majorana, Abgrall, N, Aguayo, E, III, FT Avignone, Barabash, AS, Bertrand, FE, Boswell, M, Brudanin, V, Busch, M, Caldwell, AS, Chan, Y-D, Christofferson, CD, Combs, DC, Detwiler, JA, Doe, PJ, Efremenko, Yu, Egorov, V, Ejiri, H, Elliott, SR, Esterline, J, Fast, JE, Finnerty, P, Fraenkle, FM, Galindo-Uribarri, A, Giovanetti, GK, Goett, J, Green, MP, Gruszko, J, Guiseppe, VE, Gusey, K, Hallin, AL, Hazama, R, Hegai, A, Henning, R, Hoppe, EW, Howard, S, Howe, MA, Keeter, KJ, Kidd, MF, Knecht, A, Kochetov, O, Konovalov, SI, Kouzes, RT, LaFerriere, BD, Leon, J, Leviner, LE, Loach, JC, MacMullin, S, Martin, RD, Mertens, S, Mizouni, L, Nomachi, M, Orrell, JL, O'Shaughnessy, C, Overman, NR, II, DG Phillips, Poon, AWP, Pushkin, K, Radford, DC, Rielage, K, Robertson, RGH, Ronquest, MC, Schubert, AG, Shanks, B, Shima, T, Shirchenko, M, Snavely, KJ, Snyder, N, Steele, D, Strain, J, Suriano, AM, Thompson, J, Timkin, V, Tornow, W, Varner, RL, Vasilyev, S, Vetter, K, Vorren, K, White, BR, Wilkerson, JF, Xu, W, Yakushev, E, Young, AR, Yu, C-H, Yumatov, V, Collaboration, Majorana, Collaboration, Majorana, Abgrall, N, Aguayo, E, III, FT Avignone, Barabash, AS, Bertrand, FE, Boswell, M, Brudanin, V, Busch, M, Caldwell, AS, Chan, Y-D, Christofferson, CD, Combs, DC, Detwiler, JA, Doe, PJ, Efremenko, Yu, Egorov, V, Ejiri, H, Elliott, SR, Esterline, J, Fast, JE, Finnerty, P, Fraenkle, FM, Galindo-Uribarri, A, Giovanetti, GK, Goett, J, Green, MP, Gruszko, J, Guiseppe, VE, Gusey, K, Hallin, AL, Hazama, R, Hegai, A, Henning, R, Hoppe, EW, Howard, S, Howe, MA, Keeter, KJ, Kidd, MF, Knecht, A, Kochetov, O, Konovalov, SI, Kouzes, RT, LaFerriere, BD, Leon, J, Leviner, LE, Loach, JC, MacMullin, S, Martin, RD, Mertens, S, Mizouni, L, Nomachi, M, Orrell, JL, O'Shaughnessy, C, Overman, NR, II, DG Phillips, Poon, AWP, Pushkin, K, Radford, DC, Rielage, K, Robertson, RGH, Ronquest, MC, Schubert, AG, Shanks, B, Shima, T, Shirchenko, M, Snavely, KJ, Snyder, N, Steele, D, Strain, J, Suriano, AM, Thompson, J, Timkin, V, Tornow, W, Varner, RL, Vasilyev, S, Vetter, K, Vorren, K, White, BR, Wilkerson, JF, Xu, W, Yakushev, E, Young, AR, Yu, C-H, and Yumatov, V
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.
Published: 2013

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

Author: Collaboration, The MAJORANA, Collaboration, The MAJORANA, Aguayo, E, III, FT Avignone, Back, HO, Barabash, AS, Bergevin, M, Bertrand, FE, Boswell, M, Brudanin, V, Busch, M, Chan, Y-D, Christofferson, CD, Collar, JI, Combs, DC, Cooper, RJ, Detwiler, JA, Doe, PJ, Efremenko, Yu, Egorov, V, Ejiri, H, Elliott, SR, Esterline, J, Fast, JE, Fields, N, Finnerty, P, Fraenkle, FM, Gehman, VM, Giovanetti, GK, Green, MP, Guiseppe, VE, Gusey, K, Hallin, AL, Hazama, R, Henning, R, Hime, A, Hoppe, EW, Horton, M, Howard, S, Howe, MA, Johnson, RA, Keeter, KJ, Keillor, ME, Keller, C, Kephart, JD, Kidd, MF, Knecht, A, Kochetov, O, Konovalov, SI, Kouzes, RT, LaFerriere, BD, LaRoque, BH, Leon, J, Leviner, LE, Loach, JC, MacMullin, S, Marino, MG, Martin, RD, Mei, D-M, Merriman, JH, Miller, ML, Mizouni, L, Nomachi, M, Orrell, JL, Overman, NR, II, DG Phillips, Poon, AWP, Perumpilly, G, Prior, G, Radford, DC, Rielage, K, Robertson, RGH, Ronquest, MC, Schubert, AG, Shima, T, Shirchenko, M, Snavely, KJ, Sobolev, V, Steele, D, Strain, J, Thomas, K, Timkin, V, Tornow, W, Vanyushin, I, Varner, RL, Vetter, K, Vorren, K, Wilkerson, JF, Wolfe, BA, Yakushev, E, Young, AR, Yu, C-H, Yumatov, V, Zhang, C, Collaboration, The MAJORANA, Collaboration, The MAJORANA, Aguayo, E, III, FT Avignone, Back, HO, Barabash, AS, Bergevin, M, Bertrand, FE, Boswell, M, Brudanin, V, Busch, M, Chan, Y-D, Christofferson, CD, Collar, JI, Combs, DC, Cooper, RJ, Detwiler, JA, Doe, PJ, Efremenko, Yu, Egorov, V, Ejiri, H, Elliott, SR, Esterline, J, Fast, JE, Fields, N, Finnerty, P, Fraenkle, FM, Gehman, VM, Giovanetti, GK, Green, MP, Guiseppe, VE, Gusey, K, Hallin, AL, Hazama, R, Henning, R, Hime, A, Hoppe, EW, Horton, M, Howard, S, Howe, MA, Johnson, RA, Keeter, KJ, Keillor, ME, Keller, C, Kephart, JD, Kidd, MF, Knecht, A, Kochetov, O, Konovalov, SI, Kouzes, RT, LaFerriere, BD, LaRoque, BH, Leon, J, Leviner, LE, Loach, JC, MacMullin, S, Marino, MG, Martin, RD, Mei, D-M, Merriman, JH, Miller, ML, Mizouni, L, Nomachi, M, Orrell, JL, Overman, NR, II, DG Phillips, Poon, AWP, Perumpilly, G, Prior, G, Radford, DC, Rielage, K, Robertson, RGH, Ronquest, MC, Schubert, AG, Shima, T, Shirchenko, M, Snavely, KJ, Sobolev, V, Steele, D, Strain, J, Thomas, K, Timkin, V, Tornow, W, Vanyushin, I, Varner, RL, Vetter, K, Vorren, K, Wilkerson, JF, Wolfe, BA, Yakushev, E, Young, AR, Yu, C-H, Yumatov, V, and Zhang, C
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.
Published: 2011

50. Astroparticle physics with a customized low-background broad energy Germanium detector

Author: Aalseth, CE, Aalseth, CE, Amman, M, Avignone, FT, Back, HO, Barabash, AS, Barbeau, PS, Bergevin, M, Bertrand, FE, Boswell, M, Brudanin, V, Bugg, W, Burritt, TH, Busch, M, Capps, G, Chan, YD, Collar, JI, Cooper, RJ, Creswick, R, Detwiler, JA, Diaz, J, Doe, PJ, Efremenko, Y, Egorov, V, Ejiri, H, Elliott, SR, Ely, J, Esterline, J, Farach, H, Fast, JE, Fields, N, Finnerty, P, Fujikawa, B, Fuller, E, Gehman, VM, Giovanetti, GK, Guiseppe, VE, Gusey, K, Hallin, AL, Harper, GC, Hazama, R, Henning, R, Hime, A, Hoppe, EW, Hossbach, TW, Howe, MA, Johnson, RA, Keeter, KJ, Keillor, M, Keller, C, Kephart, JD, Kidd, MF, Knecht, A, Kochetov, O, Konovalov, SI, Kouzes, RT, Leviner, L, Loach, JC, Luke, PN, MacMullin, S, Marino, MG, Martin, RD, Mei, DM, Miley, HS, Miller, ML, Mizouni, L, Meyers, AW, Nomachi, M, Orrell, JL, Peterson, D, Phillips, DG, Poon, AWP, Prior, G, Qian, J, Radford, DC, Rielage, K, Robertson, RGH, Rodriguez, L, Rykaczewski, KP, Salazar, H, Schubert, AG, Shima, T, Shirchenko, M, Steele, D, Strain, J, Swift, G, Thomas, K, Timkin, V, Tornow, W, Van Wechel, TD, Vanyushin, I, Varner, RL, Vetter, K, Wilkerson, JF, Wolfe, BA, Xiang, W, Yakushev, E, Yaver, H, Young, AR, Yu, CH, Yumatov, V, Aalseth, CE, Aalseth, CE, Amman, M, Avignone, FT, Back, HO, Barabash, AS, Barbeau, PS, Bergevin, M, Bertrand, FE, Boswell, M, Brudanin, V, Bugg, W, Burritt, TH, Busch, M, Capps, G, Chan, YD, Collar, JI, Cooper, RJ, Creswick, R, Detwiler, JA, Diaz, J, Doe, PJ, Efremenko, Y, Egorov, V, Ejiri, H, Elliott, SR, Ely, J, Esterline, J, Farach, H, Fast, JE, Fields, N, Finnerty, P, Fujikawa, B, Fuller, E, Gehman, VM, Giovanetti, GK, Guiseppe, VE, Gusey, K, Hallin, AL, Harper, GC, Hazama, R, Henning, R, Hime, A, Hoppe, EW, Hossbach, TW, Howe, MA, Johnson, RA, Keeter, KJ, Keillor, M, Keller, C, Kephart, JD, Kidd, MF, Knecht, A, Kochetov, O, Konovalov, SI, Kouzes, RT, Leviner, L, Loach, JC, Luke, PN, MacMullin, S, Marino, MG, Martin, RD, Mei, DM, Miley, HS, Miller, ML, Mizouni, L, Meyers, AW, Nomachi, M, Orrell, JL, Peterson, D, Phillips, DG, Poon, AWP, Prior, G, Qian, J, Radford, DC, Rielage, K, Robertson, RGH, Rodriguez, L, Rykaczewski, KP, Salazar, H, Schubert, AG, Shima, T, Shirchenko, M, Steele, D, Strain, J, Swift, G, Thomas, K, Timkin, V, Tornow, W, Van Wechel, TD, Vanyushin, I, Varner, RL, Vetter, K, Wilkerson, JF, Wolfe, BA, Xiang, W, Yakushev, E, Yaver, H, Young, AR, Yu, CH, and Yumatov, V
Abstract: The Majorana Collaboration is building the Majorana Demonstrator, a 60 kg array of high purity germanium detectors housed in an ultra-low background shield at the Sanford Underground Laboratory in Lead, SD. The Majorana Demonstrator will search for neutrinoless double-beta decay of 76Ge while demonstrating the feasibility of a tonne-scale experiment. It may also carry out a dark matter search in the 110 GeV/c2 mass range. We have found that customized Broad Energy Germanium (BEGe) detectors produced by Canberra have several desirable features for a neutrinoless double-beta decay experiment, including low electronic noise, excellent pulse shape analysis capabilities, and simple fabrication. We have deployed a customized BEGe, the Majorana Low-Background BEGe at Kimballton (MALBEK), in a low-background cryostat and shield at the Kimballton Underground Research Facility in Virginia. This paper will focus on the detector characteristics and measurements that can be performed with such a radiation detector in a low-background environment. © 2010 Elsevier B.V.
Published: 2011

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