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1. $$K^0_S$$ K S 0 meson production in inelastic p+p interactions at 31, 40 and 80 $$\text {Ge}\hspace{-1.00006pt}\text {V}\!/\!c$$ Ge V / c beam momentum measured by NA61 $$/$$ / SHINE at the CERN SPS

Author

NA61/SHINE Collaboration, N. Abgrall, H. Adhikary, P. Adrich, K. K. Allison, N. Amin, E. V. Andronov, T. Antićić, I.-C. Arsene, M. Bajda, Y. Balkova, M. Baszczyk, D. Battaglia, A. Bazgir, S. Bhosale, M. Bielewicz, A. Blondel, M. Bogomilov, Y. Bondar, N. Bostan, A. Brandin, A. Bravar, W. Bryliński, J. Brzychczyk, M. Buryakov, A. F. Camino, M. Ćirković, M. Csanád, J. Cybowska, T. Czopowicz, C. Dalmazzone, N. Davis, A. Dmitriev, P. von Doetinchem, W. Dominik, P. Dorosz, J. Dumarchez, R. Engel, G. A. Feofilov, L. Fields, Z. Fodor, M. Friend, M. Gaździcki, O. Golosov, V. Golovatyuk, M. Golubeva, K. Grebieszkow, F. Guber, A. Haesler, S. N. Igolkin, S. Ilieva, A. Ivashkin, A. Izvestnyy, K. Kadija, N. Kargin, N. Karpushkin, E. Kashirin, M. Kiełbowicz, V. A. Kireyeu, H. Kitagawa, R. Kolesnikov, D. Kolev, A. Korzenev, Y. Koshio, V. N. Kovalenko, S. Kowalski, B. Kozłowski, A. Krasnoperov, W. Kucewicz, M. Kuchowicz, M. Kuich, A. Kurepin, A. László, M. Lewicki, G. Lykasov, V. V. Lyubushkin, M. Maćkowiak-Pawłowska, Z. Majka, A. Makhnev, B. Maksiak, A. I. Malakhov, A. Marcinek, A. D. Marino, H.-J. Mathes, T. Matulewicz, V. Matveev, G. L. Melkumov, A. Merzlaya, Ł. Mik, A. Morawiec, S. Morozov, Y. Nagai, T. Nakadaira, M. Naskręt, S. Nishimori, V. Ozvenchuk, O. Panova, V. Paolone, O. Petukhov, I. Pidhurskyi, R. Płaneta, P. Podlaski, B. A. Popov, B. Pórfy, M. Posiadała-Zezula, D. S. Prokhorova, D. Pszczel, S. Puławski, J. Puzović, R. Renfordt, L. Ren, V. Z. Reyna Ortiz, D. Röhrich, E. Rondio, M. Roth, Ł. Rozpłochowski, B. T. Rumberger, M. Rumyantsev, A. Rustamov, M. Rybczynski, A. Rybicki, K. Sakashita, K. Schmidt, A. Yu. Seryakov, P. Seyboth, U. A. Shah, Y. Shiraishi, A. Shukla, M. Słodkowski, P. Staszel, G. Stefanek, J. Stepaniak, M. Strikhanov, H. Ströbele, T. Šuša, L. Swiderski, J. Szewiński, R. Szukiewicz, A. Taranenko, A. Tefelska, D. Tefelski, V. Tereshchenko, A. Toia, R. Tsenov, L. Turko, T. S. Tveter, M. Unger, M. Urbaniak, F. F. Valiev, D. Veberič, V. V. Vechernin, V. Volkov, A. Wickremasinghe, K. Wójcik, O. Wyszyński, A. Zaitsev, E. D. Zimmerman, A. Zviagina, and R. Zwaska

Subjects
Astrophysics, QB460-466, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract

Abstract The yields of $$K^0_S$$ K S 0 mesons have been measured in inelastic p+p interactions at incident projectile momenta of 31, 40 and 80 $$\text {Ge}\hspace{-1.00006pt}\text {V}\!/\!c$$ Ge V / c ( $$\sqrt{s_{NN}}=7.7, 8.8$$ s NN = 7.7 , 8.8 and 12.3 $$\text {Ge}\hspace{-1.00006pt}\text {V}$$ Ge V , respectively). The data were recorded by the NA61 $$/$$ / SHINE spectrometer at the CERN Super Proton Synchrotron and the $$K^0_S$$ K S 0 mesons identified via their decays into $$\pi ^{+} \pi ^{-}$$ π + π - pairs. Double-differential distributions are presented as function of transverse momentum and rapidity. The mean multiplicities of $$K^0_S$$ K S 0 mesons were determined to be $$(5.95 \pm 0.19 (stat) \pm 0.30 (sys)) \times 10^{-2}$$ ( 5.95 ± 0.19 ( s t a t ) ± 0.30 ( s y s ) ) × 10 - 2 at 31 $$\text {Ge}\hspace{-1.00006pt}\text {V}\!/\!c$$ Ge V / c , $$(7.61 \pm 0.13 (stat) \pm 0.43 (sys)) \times 10^{-2}$$ ( 7.61 ± 0.13 ( s t a t ) ± 0.43 ( s y s ) ) × 10 - 2 at 40 $$\text {Ge}\hspace{-1.00006pt}\text {V}\!/\!c$$ Ge V / c and $$(11.58 \pm 0.12 (stat) \pm 0.55 (sys)) \times 10^{-2}$$ ( 11.58 ± 0.12 ( s t a t ) ± 0.55 ( s y s ) ) × 10 - 2 at 80 $$\text {Ge}\hspace{-1.00006pt}\text {V}\!/\!c$$ Ge V / c . The results on $$K^{0}_{S}$$ K S 0 production are compared with the production of charged kaons in corresponding reactions and with model calculations (Epos1.99, SMASH 2.0 and PHSD) as well as with published data from other experiments.

Published
2024
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2. Measurements of $$\pi ^\pm $$ π± , $$K^\pm $$ K± and proton double differential yields from the surface of the T2K replica target for incoming 31 GeV/c protons with the NA61/SHINE spectrometer at the CERN SPS

Author

N. Abgrall, A. Aduszkiewicz, E. V. Andronov, T. Antićić, B. Baatar, M. Baszczyk, S. Bhosale, A. Blondel, M. Bogomilov, A. Brandin, A. Bravar, W. Bryliński, J. Brzychczyk, S. A. Bunyatov, O. Busygina, A. Bzdak, H. Cherif, M. Ćirković, T. Czopowicz, A. Damyanova, N. Davis, M. Deveaux, W. Dominik, P. Dorosz, J. Dumarchez, R. Engel, A. Ereditato, G. A. Feofilov, L. Fields, Z. Fodor, A. Garibov, M. Gaździcki, O. Golosov, M. Golubeva, K. Grebieszkow, F. Guber, A. Haesler, T. Hasegawa, A. E. Hervé, S. N. Igolkin, S. Ilieva, A. Ivashkin, S. R. Johnson, K. Kadija, E. Kaptur, N. Kargin, E. Kashirin, M. Kiełbowicz, V. A. Kireyeu, V. Klochkov, T. Kobayashi, V. I. Kolesnikov, D. Kolev, A. Korzenev, V. N. Kovalenko, K. Kowalik, S. Kowalski, M. Koziel, A. Krasnoperov, W. Kucewicz, M. Kuich, A. Kurepin, D. Larsen, A. László, T. V. Lazareva, M. Lewicki, K. Łojek, B. Łysakowski, V. V. Lyubushkin, M. Maćkowiak-Pawłowska, Z. Majka, B. Maksiak, A. I. Malakhov, D. Manić, A. Marchionni, A. Marcinek, A. D. Marino, K. Marton, H. J. Mathes, T. Matulewicz, V. Matveev, G. L. Melkumov, A. O. Merzlaya, B. Messerly, Ł. Mik, G. B. Mills, S. Morozov, S. Mrówczyński, Y. Nagai, T. Nakadaira, M. Naskręt, K. Nishikawa, V. Ozvenchuk, V. Paolone, M. Pavin, O. Petukhov, C. Pistillo, R. Płaneta, P. Podlaski, B. A. Popov, M. Posiadała-Zezula, D. S. Prokhorova, S. Puławski, J. Puzović, W. Rauch, M. Ravonel, R. Renfordt, E. Richter-Wąs, D. Röhrich, E. Rondio, M. Roth, B. T. Rumberger, A. Rustamov, M. Rybczynski, A. Rybicki, A. Sadovsky, K. Sakashita, K. Schmidt, T. Sekiguchi, I. Selyuzhenkov, A. Yu. Seryakov, P. Seyboth, M. Shibata, M. Słodkowski, A. Snoch, P. Staszel, G. Stefanek, J. Stepaniak, M. Strikhanov, H. Ströbele, T. Šuša, M. Tada, A. Taranenko, A. Tefelska, D. Tefelski, V. Tereshchenko, A. Toia, R. Tsenov, L. Turko, R. Ulrich, M. Unger, F. F. Valiev, D. Veberič, V. V. Vechernin, M. Walewski, A. Wickremasinghe, Z. Włodarczyk, A. Wojtaszek-Szwarc, O. Wyszyński, L. Zambelli, E. D. Zimmerman, R. Zwaska, L. Berns, G. A. Fiorentini, M. Friend, M. Hartz, T. Vladisavljevic, and M. Yu

Subjects
Astrophysics, QB460-466, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract

Abstract Measurements of the $$\pi ^\pm $$ π± , $$K^\pm $$ K± , and proton double differential yields emitted from the surface of the 90-$$\hbox {cm}$$ cm -long carbon target (T2K replica) were performed for the incoming $$31\,$$ 31 $$\hbox {GeV}\!/\!c$$ GeV/c protons with the NA61/SHINE spectrometer at the CERN SPS using data collected during 2010 run. The double differential $$\pi ^\pm $$ π± yields were measured with increased precision compared to the previously published NA61/SHINE results, while the $$K^\pm $$ K± and proton yields were obtained for the first time. A strategy for dealing with the dependence of the results on the incoming proton beam profile is proposed. The purpose of these measurements is to reduce significantly the (anti)neutrino flux uncertainty in the T2K long-baseline neutrino experiment by constraining the production of (anti)neutrino ancestors coming from the T2K target.

Published
2019
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3. ADC Nonlinearity Correction for the Majorana Demonstrator

Author

D. C. Radford, G. K. Giovanetti, S. J. Meijer, J. M. López-Castaño, M. Clark, J. F. Wilkerson, C. D. Christofferson, A. Hostiuc, M. F. Kidd, C. Wiseman, B. R. White, B. Shanks, V. E. Guiseppe, R. J. Hegedus, A. Drobizhev, E. L. Martin, A. S. Barabash, J. Rager, T. Gilliss, H. Ejiri, Steven Elliott, B. Bos, R. D. Martin, M. P. Green, C. M. Campbell, M. Busch, G. Othman, Susanne Mertens, F. E. Bertrand, D. W. Edwins, Richard T. Kouzes, R. L. Varner, D. Tedeschi, D. Hervas Aguilar, W. Xu, Chang-Hong Yu, C. Cuesta, Ralph Massarczyk, Walter C. Pettus, Y-D. Chan, Keith Rielage, A. L. Reine, J. Gruszko, Pinghan Chu, T. K. Oli, S. Vasilyev, H. L. Crawford, N. Abgrall, I. Kim, I. J. Arnquist, N. W. Ruof, Yu. Efremenko, F. T. Avignone, I. S. Guinn, M. Buuck, Reyco Henning, A. W. P. Poon, A. M. Lopez, M. J. Stortini, J. M. Allmond, C. J. Barton, J. Myslik, J. A. Detwiler, C. R. Haufe, B. X. Zhu, Eric W. Hoppe, and T. S. Caldwell

Subjects
Nuclear and High Energy Physics, Physics - Instrumentation and Detectors, Computer science, Gamma-ray detectors, Biomedical Engineering, FOS: Physical sciences, nucl-ex, Atomic, 01 natural sciences, Signal, Particle and Plasma Physics, 0103 physical sciences, Wide dynamic range, Electronic engineering, Waveform, Nuclear, Nuclear Experiment (nucl-ex), Electrical and Electronic Engineering, 010306 general physics, Nuclear Experiment, physics.ins-det, Signal processing, 010308 nuclear & particles physics, Dynamic range, Detector, Molecular, Instrumentation and Detectors (physics.ins-det), Nuclear & Particles Physics, Other Physical Sciences, MAJORANA, neutrinoless double-beta decay, Nuclear Energy and Engineering, Energy (signal processing)
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. Characterization of high purity germanium point contact detectors with low net impurity concentration

Author

C. Schmitt, D. C. Radford, Yuen-Dat Chan, R. D. Martin, Susanne Mertens, A. Hegai, N. Abgrall, and Alan Poon

Subjects
Nuclear and High Energy Physics, Physics - Instrumentation and Detectors, Rare event search, FOS: Physical sciences, chemistry.chemical_element, Germanium, Atomic, Nuclear physics, Particle and Plasma Physics, Affordable and Clean Energy, Impurity, Double beta decay, Nuclear, Neutrinoless double beta decay, Nuclear Experiment, physics.ins-det, Instrumentation, Physics, Range (particle radiation), Detector, Molecular, Germanium detector, Instrumentation and Detectors (physics.ins-det), Nuclear & Particles Physics, Semiconductor detector, Other Physical Sciences, chemistry, High Energy Physics::Experiment, Event (particle physics), Astronomical and Space Sciences, Energy (signal processing)
Abstract

Author(s): Mertens, S; Hegai, A; Radford, DC; Abgrall, N; Chan, YD; Martin, RD; Poon, AWP; Schmitt, C | Abstract: High Purity germanium point-contact detectors have low energy thresholds and excellent energy resolution over a wide energy range, and are thus widely used in nuclear and particle physics. In rare event searches, such as neutrinoless double beta decay, the point-contact geometry is of particular importance since it allows for pulse-shape discrimination, and therefore for a significant background reduction. In this paper we investigate the pulse-shape discrimination performance of ultra-high purity germanium point contact detectors. It is demonstrated that a minimal net impurity concentration is required to meet the pulse-shape performance requirements.

Published
2019

6. Spectral analysis for the Majorana Demonstrator experiment

Author

B. X. Zhu, V. Yumatov, J. Gruszko, Yu. Efremenko, M. Buuck, G. K. Giovanetti, Keith Rielage, B. Shanks, V. E. Guiseppe, T. Gilliss, R. D. Martin, R. G. H. Robertson, A. W. Bradley, T. Bode, C-H. Yu, Eric W. Hoppe, J. A. Detwiler, M. Shirchenko, M. P. Green, C. J. Barton, C. Dunagan, T. S. Caldwell, Ralph Massarczyk, Walter C. Pettus, C. R. Haufe, C.M. O'Shaughnessy, S. I. Alvis, A. L. Reine, S. Vasilyev, N. Abgrall, I. Zhitnikov, R. L. Varner, F. E. Bertrand, I. J. Arnquist, N. W. Ruof, Anne-Marie Suriano, I. S. Guinn, C. Cuesta, W. Xu, J. E. Trimble, Pinghan Chu, G. Othman, A. W. P. Poon, Y-D. Chan, K. J. Keeter, D. Tedeschi, L. Hehn, S. I. Konovalov, J. Myslik, M. A. Howe, Richard T. Kouzes, J. Rager, H. Ejiri, Steven Elliott, Kai Vetter, C. D. Christofferson, M. F. Kidd, Susanne Mertens, E. Yakushev, J. F. Wilkerson, S. J. Meijer, B. R. White, K. Vorren, V.B. Brudanin, F. T. Avignone, Reyco Henning, A. M. Lopez, C. Wiseman, A. S. Barabash, D. C. Radford, and M. Busch

Subjects
Physics, History, Physics - Instrumentation and Detectors, FOS: Physical sciences, Molecular, Instrumentation and Detectors (physics.ins-det), nucl-ex, Condensed Matter Physics, Atomic, Computer Science Applications, Education, Combinatorics, Other Physical Sciences, Monte carlo data, MAJORANA, Particle and Plasma Physics, Background suppression, Statistical analysis, Spectral analysis, Nuclear, Nuclear Experiment (nucl-ex), Nuclear Experiment, physics.ins-det
Abstract

The MAJORANA DEMONSTRATOR is an experiment constructed to search for neutrinoless double-beta decays in germanium-76 and to demonstrate the feasibility to deploy a ton-scale experiment in a phased and modular fashion. It consists of two modular arrays of natural and $^{76}\textrm{Ge}$-enriched germanium detectors totaling 44.1 kg (29.7 kg enriched detectors), located at the 4850' level of the Sanford Underground Research Facility in Lead, South Dakota, USA. Data taken with this setup since summer 2015 at different construction stages of the experiment show a clear reduction of the observed background index around the ROI for $0\nu\beta\beta$-decay search due to improvements in shielding. We discuss the statistical approaches to search for a $0\nu\beta\beta$-signal and derive the physics sensitivity for an expected exposure of $10\,\textrm{kg}{\cdot}\textrm{y}$ from enriched detectors using a profile likelihood based hypothesis test in combination with toy Monte Carlo data., Comment: 5 page, 2 figures, to appear in Proceedings of TAUP 2017 - XV International Conference on Topics in Astroparticle and Underground Physics, 24 - 28 July 2017, Sudbury, ON, Canada

Published
2020

7. Data quality assurance for the Majorana Demonstrator

Author

C.M. O'Shaughnessy, Kai Vetter, C. D. Christofferson, M. F. Kidd, Keith Rielage, V. Yumatov, Yu. Efremenko, M. Shirchenko, C. Cuesta, K. Vorren, I. J. Arnquist, N. W. Ruof, F. E. Bertrand, Ralph Massarczyk, G. K. Giovanetti, F. T. Avignone, A. S. Barabash, Reyco Henning, A. W. P. Poon, A. M. Lopez, J. Gruszko, S. Vasilyev, N. Abgrall, C. R. Haufe, J. E. Trimble, S. I. Alvis, B. Shanks, V. E. Guiseppe, Pinghan Chu, J. Myslik, R. L. Varner, M. P. Green, I. Zhitnikov, T. Gilliss, V.B. Brudanin, K. J. Keeter, D. Tedeschi, T. Bode, C-H. Yu, Richard T. Kouzes, L. Hehn, R. D. Martin, Susanne Mertens, E. Yakushev, D. C. Radford, R. G. H. Robertson, Eric W. Hoppe, Walter C. Pettus, A. W. Bradley, S. J. Meijer, C. Wiseman, A. L. Reine, B. X. Zhu, S. I. Konovalov, M. Busch, T. S. Caldwell, Anne-Marie Suriano, M. Buuck, J. A. Detwiler, G. Othman, C. Dunagan, I. S. Guinn, C. J. Barton, W. Xu, Y-D. Chan, J. F. Wilkerson, B. R. White, M. A. Howe, J. Rager, H. Ejiri, and Steven Elliott

Subjects
Physics, Discrete mathematics, History, Physics - Instrumentation and Detectors, Molecular, FOS: Physical sciences, Instrumentation and Detectors (physics.ins-det), Condensed Matter Physics, Atomic, Computer Science Applications, Education, Other Physical Sciences, MAJORANA, Particle and Plasma Physics, Nuclear, physics.ins-det
Abstract

The MAJORANA DEMONSTRATOR is an experiment constructed to search for neutrinoless double-beta decays in germanium-76 and to demonstrate the feasibility to deploy a large-scale experiment in a phased and modular fashion. It consists of two modular arrays of natural and $^{76}$Ge-enriched germanium detectors totalling 44.1 kg, located at the 4850' level of the Sanford Underground Research Facility in Lead, South Dakota, USA. Any neutrinoless double-beta decay search requires a thorough understanding of the background and the signal energy spectra. The various techniques employed to ensure the integrity of the measured spectra are discussed. Data collection is monitored with a thorough set of checks, and subsequent careful analysis is performed to qualify the data for higher level physics analysis. Instrumental background events are tagged for removal, and problematic channels are removed from consideration as necessary., Comment: 5 pages, 2 figures, Proceedings of TAUP 2017 - XV International Conference on Topics in Astroparticle and Underground Physics (Sudbury ON, Canada, July 24-28, 2017)

Published
2020
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8. Initial results from the Majorana Demonstrator

Author

V. B. Brudanin, Walter C. Pettus, F. E. Bertrand, C. Dunagan, Eric W. Hoppe, Keith Rielage, J. Myslik, D. J. Tedeschi, A. S. Barabash, T. S. Caldwell, M. P. Green, Kai Vetter, C. Wiseman, M. Shirchenko, H. Ejiri, C. R. Haufe, K. J. Keeter, J. E. Trimble, S. I. Alvis, C. D. Christofferson, Pinghan Chu, Ralph Massarczyk, S. I. Konovalov, I. Zhitnikov, Matthew Busch, B. Shanks, M. F. Kidd, T. Bode, V. E. Guiseppe, M. Buuck, F. T. Avignone, R. L. Varner, B. Bos, B. X. Zhu, G. Othman, I. J. Arnquist, N. W. Ruof, Reyco Henning, A. M. Lopez, Anne-Marie Suriano, T. Gilliss, J. A. Detwiler, J. F. Wilkerson, Yu. Efremenko, C. O'Shaughnessy, R. D. Martin, A. W. P. Poon, Vladimir Yumatov, Richard T. Kouzes, B. R. White, S. Vasilyev, R. G. H. Robertson, S. R. Elliott, L. Hehn, C. Cuesta, J. Rager, G. K. Giovanetti, N. Abgrall, D. C. Radford, A. L. Reine, K. Vorren, S. J. Meijer, J. Gruszko, A. W. Bradley, Susanne Mertens, E. Yakushev, W. Xu, M. A. Howe, Y-D. Chan, C.-H. Yu, I. S. Guinn, and C. J. Barton

Subjects
History, Particle physics, Physics - Instrumentation and Detectors, FOS: Physical sciences, nucl-ex, 7. Clean energy, 01 natural sciences, Atomic, Education, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), Point contact, Particle and Plasma Physics, 0103 physical sciences, Nuclear, Detector array, Nuclear Experiment (nucl-ex), 010306 general physics, Nuclear Experiment, physics.ins-det, Physics, 010308 nuclear & particles physics, hep-ex, Detector, Molecular, Instrumentation and Detectors (physics.ins-det), Condensed Matter Physics, Computer Science Applications, Semiconductor detector, Other Physical Sciences, MAJORANA, Single lead
Abstract

Neutrinoless double-beta decay searches seek to determine the nature of neutrinos, the existence of a lepton violating process, and the effective Majorana neutrino mass. The {\sc Majorana} Collaboration is assembling an array of high purity Ge detectors to search for neutrinoless double-beta decay in $^{76}$Ge. The {\sc Majorana Demonstrator} is composed of 44.8~kg (29.7 kg enriched in $^{76}$Ge) of Ge detectors in total, split between two modules contained in a low background shield at the Sanford Underground Research Facility in Lead, South Dakota. The initial goals of the {\sc Demonstrator} are to establish the required background and scalability of a Ge-based, next-generation, tonne-scale experiment. Following a commissioning run that began in 2015, the first detector module started physics data production in early 2016. We will discuss initial results of the Module 1 commissioning and first physics run, as well as the status and potential physics reach of the full {\sc Majorana Demonstrator} experiment. The collaboration plans to complete the assembly of the second detector module by mid-2016 to begin full data production with the entire array., Neutrino 2016 proceeding

Published
2020

9. Status of the MAJORANA DEMONSTRATOR

Author

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

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, 010308 nuclear & particles physics, business.industry, Modular design, 01 natural sciences, Semiconductor detector, Nuclear physics, MAJORANA, 0103 physical sciences, Detector array, 010306 general physics, business
Abstract

The MAJORANA Collaboration is constructing the MAJORANA DEMONSTRATOR, an ultralow background, 40-kg modular high purity Ge (HPGe) detector array to search for neutrinoless double-beta decay (0νββ-decay) in 76Ge. The goal of the experiment is to demonstrate a background rate at or below 3 counts/(t-y) in the 4 keV region of interest (ROI) around the 2039 keV Q-value for 76Ge 0νββ-decay. In this paper, the status of the MAJORANA DEMONSTRATOR, including its design and measurements of properties of the HPGe crystals is presented.

Published
2017

10. Measurements of $$\pi ^\pm $$ π ± , $$K^\pm $$ K ± and proton double differential yields from the surface of the T2K replica target for incoming 31 GeV/c protons with the NA61/SHINE spectrometer at the CERN SPS

Author

N. Abgrall, A. Aduszkiewicz, E. V. Andronov, T. Antićić, B. Baatar, M. Baszczyk, S. Bhosale, A. Blondel, M. Bogomilov, A. Brandin, A. Bravar, W. Bryliński, J. Brzychczyk, S. A. Bunyatov, O. Busygina, A. Bzdak, H. Cherif, M. Ćirković, T. Czopowicz, A. Damyanova, N. Davis, M. Deveaux, W. Dominik, P. Dorosz, J. Dumarchez, R. Engel, A. Ereditato, G. A. Feofilov, L. Fields, Z. Fodor, A. Garibov, M. Gaździcki, O. Golosov, M. Golubeva, K. Grebieszkow, F. Guber, A. Haesler, T. Hasegawa, A. E. Hervé, S. N. Igolkin, S. Ilieva, A. Ivashkin, S. R. Johnson, K. Kadija, E. Kaptur, N. Kargin, E. Kashirin, M. Kiełbowicz, V. A. Kireyeu, V. Klochkov, T. Kobayashi, V. I. Kolesnikov, D. Kolev, A. Korzenev, V. N. Kovalenko, K. Kowalik, S. Kowalski, M. Koziel, A. Krasnoperov, W. Kucewicz, M. Kuich, A. Kurepin, D. Larsen, A. László, T. V. Lazareva, M. Lewicki, K. Łojek, B. Łysakowski, V. V. Lyubushkin, M. Maćkowiak-Pawłowska, Z. Majka, B. Maksiak, A. I. Malakhov, D. Manić, A. Marchionni, A. Marcinek, A. D. Marino, K. Marton, H. J. Mathes, T. Matulewicz, V. Matveev, G. L. Melkumov, A. O. Merzlaya, B. Messerly, Ł. Mik, G. B. Mills, S. Morozov, S. Mrówczyński, Y. Nagai, T. Nakadaira, M. Naskręt, K. Nishikawa, V. Ozvenchuk, V. Paolone, M. Pavin, O. Petukhov, C. Pistillo, R. Płaneta, P. Podlaski, B. A. Popov, M. Posiadała-Zezula, D. S. Prokhorova, S. Puławski, J. Puzović, W. Rauch, M. Ravonel, R. Renfordt, E. Richter-Wąs, D. Röhrich, E. Rondio, M. Roth, B. T. Rumberger, A. Rustamov, M. Rybczynski, A. Rybicki, A. Sadovsky, K. Sakashita, K. Schmidt, T. Sekiguchi, I. Selyuzhenkov, A. Yu. Seryakov, P. Seyboth, M. Shibata, M. Słodkowski, A. Snoch, P. Staszel, G. Stefanek, J. Stepaniak, M. Strikhanov, H. Ströbele, T. Šuša, M. Tada, A. Taranenko, A. Tefelska, D. Tefelski, V. Tereshchenko, A. Toia, R. Tsenov, L. Turko, R. Ulrich, M. Unger, F. F. Valiev, D. Veberič, V. V. Vechernin, M. Walewski, A. Wickremasinghe, Z. Włodarczyk, A. Wojtaszek-Szwarc, O. Wyszyński, L. Zambelli, E. D. Zimmerman, R. Zwaska, L. Berns, G. A. Fiorentini, M. Friend, M. Hartz, T. Vladisavljevic, and M. Yu

Subjects
Physics, Surface (mathematics), Particle physics, Large Hadron Collider, Physics and Astronomy (miscellaneous), Spectrometer, Proton, Physics::Instrumentation and Detectors, 010308 nuclear & particles physics, Astrophysics::High Energy Astrophysical Phenomena, Flux, 7. Clean energy, 01 natural sciences, 0103 physical sciences, Production (computer science), Neutrino, Nuclear Experiment, 010306 general physics, Engineering (miscellaneous), Beam (structure)
Abstract

Measurements of the $\pi^{\pm}$, $K^{\pm}$, and proton double differential yields emitted from the surface of the 90-cm-long carbon target (T2K replica) were performed for the incoming 31 GeV/c protons with the NA61/SHINE spectrometer at the CERN SPS using data collected during 2010 run. The double differential $\pi^{\pm}$ yields were measured with increased precision compared to the previously published NA61/SHINE results, while the $K^{\pm}$ and proton yields were obtained for the first time. A strategy for dealing with the dependence of the results on the incoming proton beam profile is proposed. The purpose of these measurements is to reduce significantly the (anti)neutrino flux uncertainty in the T2K long-baseline neutrino experiment by constraining the production of (anti)neutrino ancestors coming from the T2K target.

Published
2019

11. High voltage testing for the Majorana Demonstrator

Author

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

Subjects
Nuclear and High Energy Physics, Physics - Instrumentation and Detectors, Vacuum, FOS: Physical sciences, Feedthrough, Context (language use), nucl-ex, Atomic, 01 natural sciences, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), Particle and Plasma Physics, 0103 physical sciences, Nuclear, Nuclear Experiment (nucl-ex), 010306 general physics, physics.ins-det, Nuclear Experiment, Instrumentation, Physics, MAJORANA, hep-ex, 010308 nuclear & particles physics, business.industry, Detector, Electrical engineering, Molecular, High voltage, Instrumentation and Detectors (physics.ins-det), High-voltage, Micro-discharge, Modular design, Nuclear & Particles Physics, Semiconductor detector, Other Physical Sciences, business, Astronomical and Space Sciences, Voltage
Abstract

The MAJORANA Collaboration is constructing the MAJORANA Demonstrator, an ultra-low background, 44-kg modular high-purity Ge (HPGe) detector array to search for neutrinoless double-beta decay in Ge-76. The phenomenon of surface micro-discharge induced by high-voltage has been studied in the context of the MAJORANA Demonstrator. This effect can damage the front-end electronics or mimic detector signals. To ensure the correct performance, every high-voltage cable and feedthrough must be capable of supplying HPGe detector operating voltages as high as 5 kV without exhibiting discharge. R&D measurements were carried out to understand the testing system and determine the optimum design configuration of the high-voltage path, including different improvements of the cable layout and feedthrough flange model selection. Every cable and feedthrough to be used at the MAJORANA Demonstrator was characterized and the micro-discharge effects during the MAJORANA Demonstrator commissioning phase were studied. A stable configuration has been achieved, and the cables and connectors can supply HPGe detector operating voltages without exhibiting discharge., 9 pages, 12 figures, 8 tables, submitted to NIM A

Published
2016

12. Next-generation experiments with the Active Target Time Projection Chamber (AT-TPC)

Author

J. S. Randhawa, A. O. Macchiavelli, H. Alvarez-Pol, R. G. T. Zegers, Tan Ahn, Reynold J. Cooper, W. Mittig, C. Santamaria, L. Carpenter, N. Abgrall, Marco Cortesi, J. C. Zamora, S. Beceiro-Novo, N. Watwood, D. Bazin, B. Olaizola, and Y. Ayyad

Subjects
Nuclear reaction, Physics, Nuclear and High Energy Physics, Time projection chamber, Luminosity (scattering theory), Physics::Instrumentation and Detectors, 010308 nuclear & particles physics, Detector, Inelastic scattering, Tracking (particle physics), 01 natural sciences, Nuclear physics, Recoil, 0103 physical sciences, Nuclear Experiment, 010306 general physics, Instrumentation, Beam (structure)
Abstract

The Active Target Time Projection Chamber (AT-TPC) project at the National Superconducting Cyclotron Laboratory (NSCL) is a novel Active Target designed to study nuclear reactions induced by low-intensity exotic beams. The AT-TPC acts as a tracking medium and target at the same time, providing excellent angular (1 ° ) and energy resolution (3% FWHM) and high luminosity . The AT-TPC offers a broad range of applications within the low-energy nuclear physics domain. Resonant scattering and transfer reactions are typically performed with Active Targets using beams with energies spanning from 1 to 10 A MeV and with intensities as low as 100 pps. The AT-TPC is also a promising tool for experiments where the observables of interest require higher beam energies (above 100 A MeV ). In particular, inelastic scattering reactions on light targets, where the recoil particle has a very low kinetic energy (less than 1 MeV), can be performed with such a device. In this work, we discuss aspects of the AT-TPC experimental program, focusing on experiments that leverage the outstanding capabilities this detector offers. In addition, we introduce a conceptual design for a new Time Projection Chamber detector for specific measurements of reactions using special gases as targets.

Published
2020

13. Progress Toward A 2νββ Measurement For The Majorana Demonstrator

Author

Yuen-Dat Chan, G. K. Giovanetti, J. F. Wilkerson, K. Vorren, I. J. Arnquist, N. W. Ruof, C. Wiseman, A. W. P. Poon, C. R. Haufe, B. Shanks, M. A. Howe, J. Gruszko, S. I. Alvis, F. T. Avignone, I. S. Guinn, R. L. Varner, J. E. Trimble, V. E. Guiseppe, A. S. Barabash, Reyco Henning, Ralph Massarczyk, Pinghan Chu, A. M. Lopez, T. Gilliss, I. Zhitnikov, Matthew Busch, V. B. Brudanin, C. Dunagan, C.-H. Yu, S. Vasilyev, N. Abgrall, J. Rager, R. D. Martin, Keith Rielage, K. J. Keeter, R. G. H. Robertson, C. D. Christofferson, F. E. Bertrand, M. P. Green, A. W. Bradley, H. Ejiri, D. J. Tedeschi, M. F. Kidd, B. X. Zhu, E. Yakushev, Susanne Mertens, Eric W. Hoppe, T. S. Caldwell, J. Myslik, S. J. Meijer, S. I. Konovalov, V. Yumatov, G. Othman, S. R. Elliott, Yu. Efremenko, B. R. White, Anne-Marie Suriano, J. A. Detwiler, L. Hehn, C. Cuesta, C.M. O'Shaughnessy, M. Shirchenko, Richard T. Kouzes, T. Bode, D. C. Radford, Kai Vetter, Walter C. Pettus, A. L. Reine, W. Xu, C. J. Barton, and M. Buuck

Subjects
Physics, Nuclear physics, History, MAJORANA, Point contact, Muon, Energy spectrum, Computer Science Applications, Education
Abstract

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

Published
2020

14. Initial results from the Majorana Demonstrator

Author

Ralph Massarczyk, J. Gruszko, M. Shirchenko, V. B. Brudanin, W. Xu, J. F. Wilkerson, S. Vasilyev, J. Rager, Keith Rielage, N. Abgrall, C. R. Haufe, T. Bode, C. J. Barton, S. I. Alvis, M. Buuck, C. Wiseman, G. K. Giovanetti, F. E. Bertrand, B. Bos, Walter C. Pettus, G. Othman, C. Dunagan, I. Zhitnikov, Matthew Busch, J. E. Trimble, A. W. Bradley, Eric W. Hoppe, Pinghan Chu, D. J. Tedeschi, I. J. Arnquist, N. W. Ruof, Yu. Efremenko, T. S. Caldwell, E. Yakushev, A. S. Barabash, C.-H. Yu, M. F. Kidd, I. S. Guinn, L. Hehn, B. Shanks, C. D. Christofferson, V. E. Guiseppe, B. X. Zhu, A. W. P. Poon, C. Cuesta, D. C. Radford, T. Gilliss, R. D. Martin, R. G. H. Robertson, A. L. Reine, K. Vorren, Kai Vetter, M. A. Howe, Richard T. Kouzes, B. R. White, S. J. Meijer, M. P. Green, H. Ejiri, Susanne Mertens, K. J. Keeter, C. O׳Shaughnessy, F. T. Avignone, R. L. Varner, Reyco Henning, A. M. Lopez, Chan Y-D., J. Myslik, S. I. Konovalov, V. Yumatov, S. R. Elliott, Anne-Marie Suriano, and J. A. Detwiler

Subjects
Physics, History, MAJORANA, Particle physics, Full data, Neutrino, Computer Science Applications, Education
Abstract

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

Published
2020

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

Author

G. K. Giovanetti, L. Hehn, J. Gruszko, J. E. Trimble, C. Cuesta, Pinghan Chu, B. Shanks, V. E. Guiseppe, C.M. O'Shaughnessy, T. Gilliss, M. Busch, R. D. Martin, I. J. Arnquist, N. W. Ruof, S. J. Meijer, A. W. P. Poon, M. Shirchenko, R. G. H. Robertson, A. S. Barabash, C. J. Barton, M. Buuck, B. X. Zhu, T. Bode, F. T. Avignone, Keith Rielage, D. C. Radford, Reyco Henning, A. M. Lopez, C. R. Haufe, Walter C. Pettus, Anne-Marie Suriano, S. I. Alvis, A. L. Reine, Eric W. Hoppe, J. A. Detwiler, I. Zhitnikov, T. S. Caldwell, C. Dunagan, V.B. Brudanin, M. P. Green, Chang-Hong Yu, A. W. Bradley, Ralph Massarczyk, S. Vasilyev, N. Abgrall, W. Xu, Y-D. Chan, F. E. Bertrand, G. Othman, K. J. Keeter, D. Tedeschi, I. S. Guinn, S. I. Konovalov, C. Wiseman, J. F. Wilkerson, B. R. White, M. A. Howe, V. Yumatov, Yu. Efremenko, J. Rager, H. Ejiri, Steven Elliott, Richard T. Kouzes, Kai Vetter, C. D. Christofferson, M. F. Kidd, R. L. Varner, Susanne Mertens, E. Yakushev, K. Vorren, and J. Myslik

Subjects
Discrete mathematics, Physics, History, Point contact, MAJORANA, Computer Science Applications, Education
Abstract

Author(s): 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 | 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

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

Author

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

Subjects
Physics, Semileptonic decay, 010308 nuclear & particles physics, General Physics and Astronomy, 01 natural sciences, Semiconductor detector, Nuclear physics, Full width at half maximum, MAJORANA, Double beta decay, 0103 physical sciences, Neutrino, 010306 general physics, Neutrino oscillation, Energy (signal processing)
Abstract

The Majorana Collaboration is operating an array of high purity Ge detectors to search for neutrinoless double-β decay in ^{76}Ge. The Majorana Demonstrator comprises 44.1 kg of Ge detectors (29.7 kg enriched in ^{76}Ge) split between two modules contained in a low background shield at the Sanford Underground Research Facility in Lead, South Dakota. Here we present results from data taken during construction, commissioning, and the start of full operations. We achieve unprecedented energy resolution of 2.5 keV FWHM at Q_{ββ} and a very low background with no observed candidate events in 9.95 kg yr of enriched Ge exposure, resulting in a lower limit on the half-life of 1.9×10^{25} yr (90% C.L.). This result constrains the effective Majorana neutrino mass to below 240-520 meV, depending on the matrix elements used. In our experimental configuration with the lowest background, the background is 4.0_{-2.5}^{+3.1} counts/(FWHM t yr).

Published
2018

17. Search for Neutrinoless Double-β Decay in ^{76}Ge with the Majorana Demonstrator

Author

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

Abstract

The Majorana Collaboration is operating an array of high purity Ge detectors to search for neutrinoless double-β decay in ^{76}Ge. The Majorana Demonstrator comprises 44.1 kg of Ge detectors (29.7 kg enriched in ^{76}Ge) split between two modules contained in a low background shield at the Sanford Underground Research Facility in Lead, South Dakota. Here we present results from data taken during construction, commissioning, and the start of full operations. We achieve unprecedented energy resolution of 2.5 keV FWHM at Q_{ββ} and a very low background with no observed candidate events in 9.95 kg yr of enriched Ge exposure, resulting in a lower limit on the half-life of 1.9×10^{25} yr (90% C.L.). This result constrains the effective Majorana neutrino mass to below 240-520 meV, depending on the matrix elements used. In our experimental configuration with the lowest background, the background is 4.0_{-2.5}^{+3.1} counts/(FWHM t yr).

Published
2018

18. The processing of enriched germanium for the Majorana Demonstrator and R&D for a next generation double-beta decay experiment

Author

Ralph Massarczyk, G. K. Giovanetti, C. Wiseman, C. R. Haufe, S. Vasilyev, J. F. Wilkerson, F. E. Bertrand, Kai Vetter, N. Abgrall, I. S. Guinn, A. S. Barabash, I. Zhitnikov, Matthew Busch, D. C. Radford, M. P. Green, B. Shanks, V. E. Guiseppe, W. Xu, H. Ejiri, S. J. Meijer, J. Myslik, J. Caja, C. Dunagan, J. Rager, B. R. Jasinski, A. L. Reine, S. I. Konovalov, Yu. Efremenko, L.M. Toth, J. Gruszko, F. T. Avignone, C.M. O'Shaughnessy, R. L. Varner, C. D. Christofferson, C.-H. Yu, Reyco Henning, Keith Rielage, T. Gilliss, J. Goett, A. M. Lopez, V. Yumatov, J.H. Meyer, C. Cuesta, S. R. Elliott, R. D. Martin, A. W. Bradley, Eric W. Hoppe, K. Vorren, V.B. Brudanin, E. Yakushev, R. G. H. Robertson, T. S. Caldwell, M. Shirchenko, D. J. Tedeschi, M. Caja, Susanne Mertens, M. F. Kidd, B. X. Zhu, I. J. Arnquist, Alan Poon, Anne-Marie Suriano, J. A. Detwiler, J.A. Reising, J. E. Trimble, Pinghan Chu, D.T. Dunstan, B. R. White, J. MacMullin, M. Buuck, and Richard T. Kouzes

Subjects
Physics, Nuclear and High Energy Physics, Isotopes of germanium, 010308 nuclear & particles physics, Detector, chemistry.chemical_element, Germanium, 7. Clean energy, 01 natural sciences, Particle detector, Semiconductor detector, ddc, Nuclear physics, MAJORANA, chemistry, Double beta decay, 0103 physical sciences, 010306 general physics, Instrumentation, Radioactive decay
Abstract

The Majorana Demonstrator is an array of point-contact Ge detectors fabricated from Ge isotopically enriched to 88% in 76 Ge 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 76 Ge 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 68 Ge 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 68 Ge was reduced by a significant factor over that in natural abundance detectors not protected from cosmic rays.

Published
2018

19. Low Background Materials and Fabrication Techniques for Cables and Connectors in the Majorana Demonstrator

Author

T. Gilliss, R. D. Martin, R. G. H. Robertson, C. J. Barton, V.B. Brudanin, G. K. Giovanetti, B. Shanks, V. E. Guiseppe, I. J. Arnquist, J. F. Wilkerson, S. J. Meijer, A. S. Barabash, B. R. White, Keith Rielage, M. Busch, Eric W. Hoppe, M. A. Howe, Kai Vetter, C.M. O'Shaughnessy, C. D. Christofferson, F. T. Avignone, A. W. P. Poon, M. Shirchenko, K. Vorren, T. S. Caldwell, M. F. Kidd, J. Rager, H. Ejiri, Steven Elliott, V. Yumatov, A. L. Reine, Yu. Efremenko, C. Wiseman, I. S. Guinn, Reyco Henning, A. M. Lopez, D. C. Radford, Chang-Hong Yu, J. Myslik, Susanne Mertens, E. Yakushev, M. Buuck, N. W. Rouf, C. Cuesta, W. Xu, Y-D. Chan, Richard T. Kouzes, Ralph Massarczyk, S. Vasilyev, N. Abgrall, A. W. Bradley, Anne-Marie Suriano, T. Bode, M. P. Green, J. Gruszko, C. R. Haufe, S. I. Alvis, I. Zhitnikov, K. J. Keeter, D. Tedeschi, L. Hehn, J. E. Trimble, G. Othman, Pinghan Chu, F. E. Bertrand, S. I. Konovalov, B. X. Zhu, J. A. Detwiler, C. Dunagan, and R. L. Varner

Subjects
Cryostat, MAJORANA, Fabrication, Reliability (semiconductor), Upgrade, Physics - Instrumentation and Detectors, Computer science, Detector, Systems engineering, FOS: Physical sciences, Electronics, Instrumentation and Detectors (physics.ins-det), physics.ins-det
Abstract

The MAJORANA Collaboration is searching for the neutrinoless double-beta decay of the nucleus Ge-76. The MAJORANA DEMONSTRATOR is an array of germanium detectors deployed with the aim of implementing background reduction techniques suitable for a tonne scale Ge-76-based search (the LEGEND collaboration). In the DEMONSTRATOR, germanium detectors operate in an ultra-pure vacuum cryostat at 80 K. One special challenge of an ultra-pure environment is to develop reliable cables, connectors, and electronics that do not significantly contribute to the radioactive background of the experiment. This paper highlights the experimental requirements and how these requirements were met for the MAJORANA DEMONSTRATOR, including plans to upgrade the wiring for higher reliability in the summer of 2018. Also described are requirements for LEGEND R&D efforts underway to meet these additional requirements., Proceedings of LRT 2017

Published
2017

20. Background Model for the Majorana Demonstrator

Author

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

Subjects
Physics, majorana, business.industry, Physics and Astronomy(all), germanium detector, neutrinoless double beta decay, Semiconductor detector, Reduction (complexity), Point contact, MAJORANA, Double beta decay, Pulse shape analysis, Aerospace engineering, Neutrino, Hpge detector, business
Abstract

The Majorana Collaboration is constructing a system containing 40kg of HPGe detectors to demonstrate the feasibility and potential of a future tonne-scale experiment capable of probing the neutrino mass scale in the inverted-hierarchy region. To realize this, a major goal of the Majorana Demonstrator is to demonstrate a path forward to achieving a background rate at or below 1 cnt/(ROI-t-y) in the 4 keV region of interest around the Q-value at 2039 keV. This goal is pursued through a combination of a significant reduction of radioactive impurities in construction materials with analytical methods for background rejection, for example using powerful pulse shape analysis techniques profiting from the p-type point contact HPGe detectors technology. The effectiveness of these methods is assessed using simulations of the different background components whose purity levels are constrained from radioassay measurements.

Published
2015

21. The Majorana Low-noise Low-background Front-end Electronics

Author

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

Subjects
Physics, business.industry, Detector, chemistry.chemical_element, Germanium, Substrate (electronics), Physics and Astronomy(all), Noise (electronics), Capacitance, neutrinoless double beta decay, law.invention, Nuclear physics, MAJORANA, low noise, chemistry, law, Double beta decay, low background, Optoelectronics, charge sensitive amplifer, Resistor, business, resistive-feedback front-end
Abstract

The MAJORANA DEMONSTRATOR will search for the neutrinoless double beta decay (ββ(0ν)) of the isotope 76Ge with a mixed array of enriched and natural germanium detectors. In view of the next generation of tonne-scale germanium-based ββ(0ν)-decay searches, a major goal of the MAJORANA DEMONSTRATOR is to demonstrate a path forward to achieving a background rate at or below 1 cnt/(ROI-t-y) in the 4 keV region of interest (ROI) around the 2039-keV Q-value of the 76Ge ββ(0ν)-decay. Such a requirement on the background level significantly constrains the design of the readout electronics, which is further driven by noise and energy resolution performances. We present here the low-noise low- background front-end electronics developed for the low-capacitance p-type point contact (P-PC) germanium detectors of the MAJORANA DEMONSTRATOR. This resistive-feedback front-end, specifically designed to have low mass, is fabricated on a radioassayed fused-silica substrate where the feedback resistor consists of a sputtered thin film of high purity amorphous germanium and the feedback capacitor is based on the capacitance between gold conductive traces.

Published
2015
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22. Testing the Ge Detectors for the MAJORANA DEMONSTRATOR

Author

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

Subjects
Physics - Instrumentation and Detectors, majorana, FOS: Physical sciences, chemistry.chemical_element, Germanium, Physics and Astronomy(all), germanium detector, Capacitance, neutrinoless double beta decay, Crystal, Nuclear physics, Double beta decay, Nuclear Experiment (nucl-ex), Nuclear Experiment, Physics, business.industry, Detector, Instrumentation and Detectors (physics.ins-det), Semiconductor detector, Characterization (materials science), MAJORANA, chemistry, Optoelectronics, High Energy Physics::Experiment, business
Abstract

High purity germanium (HPGe) crystals will be used for the MAJORANA DEMONSTRATOR, where they serve as both the source and the detector for neutrinoless double beta decay. It is crucial for the experiment to understand the performance of the HPGe crystals. A variety of crystal properties are being investigated, including basic properties such as energy resolution, efficiency, uniformity, capacitance, leakage current and crystal axis orientation, as well as more sophisticated properties, e.g. pulse shapes and dead layer and transition layer distributions. In this paper, we will present our measurements that characterize the HPGe crystals. We will also discuss our simulation package for the detector characterization setup, and show that additional information can be extracted from data-simulation comparisons., Comment: To appear in the Proceedings of the 13th International Conference on Topics in Astroparticle and Underground Physics, TAUP 2013 (F. Avignone & W. Haxton, editors, Physics Procedia, Elsevier)

Published
2015

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

Author

V. Yumatov, Yu. Efremenko, V.B. Brudanin, Anne-Marie Suriano, M. Busch, Ralph Massarczyk, Keith Rielage, F. T. Avignone, S. Vasilyev, R. L. Varner, Reyco Henning, A. M. Lopez, J. E. Trimble, N. Abgrall, J. A. Detwiler, Pinghan Chu, C. Dunagan, D. C. Radford, K. J. Keeter, G. Othman, D. Tedeschi, C. J. Barton, G. K. Giovanetti, I. J. Arnquist, L. Hehn, Eric W. Hoppe, T. S. Caldwell, C. Wiseman, B. Shanks, T. Bode, V. E. Guiseppe, J. Gruszko, A. W. P. Poon, N. W. Rouf, T. Gilliss, F. E. Bertrand, R. D. Martin, A. W. Bradley, J. Myslik, S. I. Konovalov, B. X. Zhu, R. G. H. Robertson, Chang-Hong Yu, C.M. O'Shaughnessy, I. S. Guinn, C. R. Haufe, S. I. Alvis, I. Zhitnikov, J. Rager, H. Ejiri, Steven Elliott, M. A. Howe, J. F. Wilkerson, B. R. White, M. Shirchenko, C. Cuesta, W. Xu, Y-D. Chan, M. P. Green, K. Vorren, M. Buuck, S. J. Meijer, A. L. Reine, Susanne Mertens, E. Yakushev, Kai Vetter, C. D. Christofferson, M. F. Kidd, Richard T. Kouzes, and A. S. Barabash

Subjects
Physics, Particle physics, MAJORANA, Physics - Instrumentation and Detectors, Detector, FOS: Physical sciences, Instrumentation and Detectors (physics.ins-det), Nuclear Experiment (nucl-ex), Neutrino, nucl-ex, Nuclear Experiment, physics.ins-det, Lepton
Abstract

Neutrinoless double-beta decay searches play a major role in determining the nature of neutrinos, the existence of a lepton violating process, and the effective Majorana neutrino mass. The MAJORANA Collaboration assembled an array of high purity Ge detectors to search for neutrinoless double-beta decay in Ge-76. The MAJORANA DEMONSTRATOR is comprised of 44.1 kg (29.7 kg enriched in Ge-76) of Ge detectors divided between two modules contained in a low-background shield at the Sanford Underground Research Facility in Lead, South Dakota, USA. The initial goals of the DEMONSTRATOR are to establish the required background and scalability of a Ge-based next-generation ton-scale experiment. Following a commissioning run that started in 2015, the first detector module started low-background data production in early 2016. The second detector module was added in August 2016 to begin operation of the entire array. We discuss results of the initial physics runs, as well as the status and physics reach of the full MAJORANA DEMONSTRATOR experiment., Proceedings of the MEDEX'17 meeting (Prague, May 29 - June 2, 2017)

Published
2017

24. Status of the Majorana Demonstrator

Author

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

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Physics::Instrumentation and Detectors, business.industry, Modular design, Semiconductor detector, Nuclear physics, MAJORANA, Double beta decay, High Energy Physics::Experiment, Mass scale, Neutrino, Detector array, Nuclear Experiment, business
Abstract

The Majorana Collaboration is constructing the Majorana Demonstrator , an ultra-low background, 40-kg modular high purity Ge detector array to search for neutrinoless double-beta decay in 76Ge. In view of the next generation of tonne-scale Ge-based neutrinoless double-beta decay searches that will probe the neutrino mass scale in the inverted-hierarchy region, a major goal of the Demonstrator is to demonstrate a path forward to achieving a background rate at or below 1 count/tonne/year in the 4 keV region of interest around the Q-value at 2039 keV. The current status of the Demonstrator is discussed, as are plans for its completion.

Published
2015

25. Measurements of $$\pi ^\pm $$ π ± differential yields from the surface of the T2K replica target for incoming 31 GeV/c protons with the NA61/SHINE spectrometer at the CERN SPS

Author

A. Garibov, A. Grzeszczuk, Gyorgy Vesztergombi, B. Maksiak, K. Dynowski, Markus Roth, A. K. Ichikawa, G. A. Feofilov, M. Hartz, A. Tefelska, T. Sekiguchi, E. Rondio, K. Kowalik, D. Tefelski, M. Maćkowiak-Pawłowska, S. R. Johnson, M. Kuich, Tsuyoshi Nakaya, V. Tereshchenko, A. S. Kapoyannis, Marek Gaździcki, Jan Kisiel, S.A. Bunyatov, O. Busygina, O. Wyszyński, L. Zambelli, Fotis K. Diakonos, M. Lewicki, A. Korzenev, T. Kobayashi, Dieter Røhrich, A. Bravar, H. Dembinski, S. Puławski, V. P. Kondratiev, O. Petukhov, M. Vassiliou, Davide Sgalaberna, Ludwik Turko, H. Ströbele, E. Kaptur, A. Haesler, Vladimir Vechernin, Yasir Ali, M. Naskręt, R. Engel, M. Nirkko, R. Sarnecki, S. Kowalski, K. Nishikawa, F. Bay, Evgeny Andronov, K. Suzuki, M. Ćirković, T. Matulewicz, A. Murakami, A. Sadovsky, M. Bogomilov, Katarzyna Grebieszkow, T. Nakadaira, Rainer Arno Ernst Renfordt, K. Marton, A. Taranenko, J. Puzović, G. Stefanek, Andras Laszlo, J. Blümer, K. Schmidt, M. Szuba, R. Płaneta, M.B. Golubeva, A. Wilczek, St Mrówczyński, Antonio Ereditato, V. Galymov, A. V. Brandin, M. Ajaz, S. Debieux, Michal Koziel, V. I. Kolesnikov, Z. Fodor, D. Kolev, M. Friend, M. Unger, B. Baatar, Hidetoshi Kubo, G. B. Mills, Ralf Ulrich, M. Yu, A. Rustamov, André Rubbia, Tobiasz Czopowicz, Maciej Rybczyński, T. Antičić, E. Richter-Wąs, S. V. Morozov, H. J. Mathes, B. Messerly, M. Słodkowski, K. Yarritu, J. Dumarchez, Takahiro Hiraki, Michael Deveaux, B. A. Popov, Dag Larsen, P. Seyboth, M. Ravonel, J. Stepaniak, F.F. Guber, Darko Veberič, V. Paolone, Antoni Aduszkiewicz, A. Wojtaszek-Szwarc, Anne Robert, E. D. Zimmerman, Kodai Matsuoka, S.N. Igolkin, W. Dominik, N. Davis, C. Pistillo, Leonid Vinogradov, Kreso Kadija, M. Shibata, S. Di Luise, D. Manić, V. V. Lyubushkin, Apostolos Panagiotou, I. Selyuzhenkov, G. L. Melkumov, N. Abgrall, A. Seryakov, M. Pavin, T. Hasegawa, V. Matveev, A. Ivashkin, Alexey Kurepin, W. Rauch, P. Staszel, A. Marcinek, M. Tzanov, A. Redij, B. T. Rumberger, Y. Nagai, K. Sakashita, N. G. Antoniou, M. Posiadala-Zezula, Zbigniew Wlodarczyk, A. Hervé, Alexey Krasnoperov, M. Hierholzer, Panagiotis Christakoglou, M. Tada, J. Brzychczyk, R. Tsenov, T. Susa, A. D. Marino, Alexander Malakhov, and A. Blondel

Subjects
Physics, Surface (mathematics), Particle physics, Large Hadron Collider, Physics and Astronomy (miscellaneous), Spectrometer, Physics::Instrumentation and Detectors, 010308 nuclear & particles physics, Astrophysics::High Energy Astrophysical Phenomena, Replica, Flux, Neutrino beam, 01 natural sciences, 0103 physical sciences, High Energy Physics::Experiment, Neutrino, Differential (infinitesimal), Nuclear Experiment, 010306 general physics, Engineering (miscellaneous)
Abstract

Measurements of particle emission from a replica of the T2K 90 cm-long carbon target were performed in the NA61/SHINE experiment at CERN SPS, using data collected during a high-statistics run in 2009. An efficient use of the long-target measurements for neutrino flux predictions in T2K requires dedicated reconstruction and analysis techniques. Fully-corrected differential yields of π±-mesons from the surface of the T2K replica target for incoming 31 GeV/c protons are presented. A possible strategy to implement these results into the T2K neutrino beam predictions is discussed and the propagation of the uncertainties of these results to the final neutrino flux is performed., The European Physical Journal C, 76 (11), ISSN:1434-6044, ISSN:1434-6052

Published
2016

26. Search for Pauli exclusion principle violating atomic transitions and electron decay with a p-type point contact germanium detector

Author

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

Subjects
Physics - Instrumentation and Detectors, Physics and Astronomy (miscellaneous), FOS: Physical sciences, Electron, nucl-ex, Atomic, 01 natural sciences, Nuclear physics, symbols.namesake, Particle and Plasma Physics, Pauli exclusion principle, 0103 physical sciences, Nuclear, Nuclear Experiment (nucl-ex), 010306 general physics, physics.ins-det, Nuclear Experiment, Engineering (miscellaneous), Physics, Quantum Physics, Auger effect, 010308 nuclear & particles physics, Detector, Molecular, Instrumentation and Detectors (physics.ins-det), Nuclear & Particles Physics, Semiconductor detector, MAJORANA, Atomic electron transition, symbols, Neutrino
Abstract

A search for Pauli-exclusion-principle-violating K-alpha electron transitions was performed using 89.5 kg-d of data collected with a p-type point contact high-purity germanium detector operated at the Kimballton Underground Research Facility. A lower limit on the transition lifetime of 5.8x10^30 seconds at 90% C.L. was set by looking for a peak at 10.6 keV resulting from the x-ray and Auger electrons present following the transition. A similar analysis was done to look for the decay of atomic K-shell electrons into neutrinos, resulting in a lower limit of 6.8x10^30 seconds at 90 C.L. It is estimated that the MAJORANA DEMONSTRATOR, a 44 kg array of p-type point contact detectors that will search for the neutrinoless double-beta decay of 76-Ge, could improve upon these exclusion limits by an order of magnitude after three years of operation. Abgrall, N; Arnquist, I J; Avignone, F T; Barabash, A S; Bertrand, F E; Bradley, A W; Brudanin, V; Busch, M; Buuck, M; Caldwell, A S; Chan, Y-D; Christofferson, C D; Chu, P -H; Cuesta, C; Detwiler, J A; Dunagan, C; Efremenko, Yu; Ejiri, H; Elliott, S R; Finnerty, P S; Galindo-Uribarri, A; Gilliss, T; Giovanetti, G K; Goett, J; Green, M P; Gruszko, J; Guinn, I S; Guiseppe, V E; Henning, R; Hoppe, E W; Howard, S; Howe, M A; Jasinski, B R; Keeter, K J; Kidd, M F; Konovalov, S I; Kouzes, R T; LaFerriere, B D; Leon, J; MacMullin, J; Martin, R D; Massarczyk, R; Meijer, S J; Mertens, S; Orrell, J L; O'Shaughnessy, C; Poon, A W P; Radford, D C; Rager, J; Rielage, K; Robertson, R G H; Romero-Romero, E; Shanks, B; Shirchenko, M; Suriano, A M; Tedeschi, D; Trimble, J E; Varner, R L; Vasilyev, S; Vetter, K; Vorren, K; White, B R; Wilkerson, J F; Wiseman, C; Xu, W; Yakushev, E; Yu, C -H; Yumatov, V; Zhitnikov, I

Published
2016

27. The Majorana Demonstrator radioassay program

Author

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

Subjects
Nuclear and High Energy Physics, Physics - Instrumentation and Detectors, FOS: Physical sciences, Context (language use), Radiopurity, nucl-ex, 7. Clean energy, 01 natural sciences, Atomic, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), Mass spectroscopy, Particle and Plasma Physics, Germanium counting, Double beta decay, 0103 physical sciences, Nuclear, Nuclear Experiment (nucl-ex), Neutron activation analysis, 010306 general physics, Nuclear Experiment, Instrumentation, physics.ins-det, Low background, Physics, MAJORANA, Mass spectrometry, 010308 nuclear & particles physics, hep-ex, Detector, Molecular, Trace analysis, Instrumentation and Detectors (physics.ins-det), Nuclear & Particles Physics, Semiconductor detector, Other Physical Sciences, Astronomical and Space Sciences, Neutron activation
Abstract

The MAJORANA collaboration is constructing the MAJORANA DEMONSTATOR at the Sanford Underground Research Facility at the Homestake gold mine, in Lead, SD. The apparatus will use Ge detectors, enriched in isotope \nuc{76}{Ge}, to demonstrate the feasibility of a large-scale Ge detector experiment to search for neutrinoless double beta decay. The long half-life of this postulated process requires that the apparatus be extremely low in radioactive isotopes whose decays may produce backgrounds to the search. The radioassay program conducted by the collaboration to ensure that the materials comprising the apparatus are sufficiently pure is described. The resulting measurements of the radioactive-isotope contamination for a number of materials studied for use in the detector are reported., to be submitted to NIM

Published
2016

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

Author

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

Subjects
Physics - Instrumentation and Detectors, Ray, Veto, Flux, FOS: Physical sciences, nucl-ex, 01 natural sciences, Atomic, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), Particle and Plasma Physics, 0103 physical sciences, Nuclear, Nuclear Experiment (nucl-ex), 010306 general physics, physics.ins-det, Nuclear Experiment, Physics, Muon, 010308 nuclear & particles physics, hep-ex, Molecular, Astronomy and Astrophysics, Instrumentation and Detectors (physics.ins-det), Nuclear & Particles Physics, MAJORANA, Muon flux, Cosmic, Astronomical and Space Sciences
Abstract

We report the first measurement of the total MUON flux underground at the Davis Campus of the Sanford Underground Research Facility at the 4850 ft level. Measurements were done with the Majorana Demonstrator veto system arranged in two different configurations. The measured total flux is (5.31+/-0.17) x 10^-9 muons/s/cm^2., 15 pages, 7 figures

Published
2016

29. New limits on Bosonic Dark Matter, Solar Axions, Pauli Exclusion Principle Violation, and Electron Decay from the Majorana Demonstrator

Author

M. P. Green, H. Ejiri, W. Xu, Eric W. Hoppe, J. Goett, Kai Vetter, M. Shirchenko, C. R. Haufe, C. D. Christofferson, D. C. Radford, I. Zhitnikov, Matthew Busch, Keith Rielage, T. Gilliss, K. Vorren, I. J. Arnquist, I. S. Guinn, Richard T. Kouzes, R. D. Martin, C. Dunagan, C.-H. Yu, Yu. Efremenko, Stanley M. Howard, J. Rager, A. S. Barabash, R. G. H. Robertson, T. S. Caldwell, A. L. Reine, C. Cuesta, S. I. Konovalov, C. Wiseman, G. K. Giovanetti, D. J. Tedeschi, B. Shanks, V. E. Guiseppe, B. R. White, V. Yumatov, E. Yakushev, J. F. Wilkerson, Yuen-Dat Chan, S. R. Elliott, M. F. Kidd, B. X. Zhu, F. E. Bertrand, M. A. Howe, C.M. O'Shaughnessy, Alan Poon, Anne-Marie Suriano, J. A. Detwiler, J. MacMullin, J. Gruszko, J. E. Trimble, Pinghan Chu, M. Buuck, S. J. Meijer, Susanne Mertens, K. J. Keeter, V.B. Brudanin, F. T. Avignone, R. L. Varner, Reyco Henning, A. M. Lopez, B. R. Jasinski, A. W. Bradley, Ralph Massarczyk, S. Vasilyev, and N. Abgrall

Subjects
Physics, Particle physics, Physics - Instrumentation and Detectors, 010308 nuclear & particles physics, Dark matter, High Energy Physics::Phenomenology, General Physics and Astronomy, FOS: Physical sciences, Electron, Instrumentation and Detectors (physics.ins-det), 01 natural sciences, Vector boson, Pseudoscalar, Nuclear physics, symbols.namesake, MAJORANA, Pauli exclusion principle, WIMP, 0103 physical sciences, symbols, Nuclear Experiment (nucl-ex), 010306 general physics, Nuclear Experiment, Axion
Abstract

We present new limits on exotic keV-scale physics based on 478 kg d of MAJORANA DEMONSTRATOR commissioning data. Constraints at the 90% confidence level are derived on bosonic dark matter (DM) and solar axion couplings, Pauli exclusion principle violating (PEPV) decay, and electron decay using monoenergetic peak signal-limits above our background. Our most stringent DM constraints are set for 11.8 keV mass particles, limiting $g_{Ae} 1.2 \times 10^{24}\;$yr for $e^- \rightarrow$ invisible.

Published
2016
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30. Status of the MAJORANA DEMONSTRATOR: A Search for Neutrinoless Double-Beta Decay

Author

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

Subjects
Physics, MAJORANA, Particle physics, Double beta decay
Published
2015

31. The Majorana Demonstrator: A Search for Neutrinoless Double-beta Decay of 76Ge

Author

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

Subjects
Physics, History, Antiparticle, Particle physics, Physics - Instrumentation and Detectors, High Energy Physics::Phenomenology, FOS: Physical sciences, Fermion, Electron, Instrumentation and Detectors (physics.ins-det), Lepton number, Computer Science Applications, Education, MAJORANA, Double beta decay, Neutron, High Energy Physics::Experiment, Neutrino, Nuclear Experiment (nucl-ex), Nuclear Experiment
Abstract

Neutrinoless double-beta decay is a hypothesized process where in some even-even nuclei it might be possible for two neutrons to simultaneously decay into two protons and two electrons without emitting neutrinos. This is possible only if neutrinos are Majorana particles, i.e. fermions that are their own antiparticles. Neutrinos being Majorana particles would explicitly violate lepton number conservation, and might play a role in the matter-antimatter asymmetry in the universe. The observation of neutrinoless double-beta decay would also provide complementary information related to neutrino masses. The Majorana Collaboration is constructing the Majorana Demonstrator, a 40-kg modular germanium detector array, to search for the Neutrinoless double-beta decay of 76Ge and to demonstrate a background rate at or below 3 counts/(ROI-t-y) in the 4 keV region of interest (ROI) around the 2039 keV Q-value for 76Ge Neutrinoless double-beta decay. In this paper, we discuss the physics of neutrinoless double beta decay and then focus on the Majorana Demonstrator, including its design and approach to achieve ultra-low backgrounds and the status of the experiment., Comment: Published Version. 10 pages, 6 figures, proceedings for the 2nd Workshop on Germanium Detectors and Technologies, 14-17 September 2014, at the University of South Dakota, Vermillion, SD

Published
2015
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32. MAJORANA Collaboration's Experience with Germanium Detectors

Author

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

Subjects
Physics, History, Physics - Instrumentation and Detectors, Detector, chemistry.chemical_element, FOS: Physical sciences, Germanium, Instrumentation and Detectors (physics.ins-det), Engineering physics, Computer Science Applications, Education, Characterization (materials science), Point contact, MAJORANA, chemistry, Germanium crystal, Nuclear Experiment (nucl-ex), Nuclear Experiment
Abstract

The goal of the \textsc{Majorana} \textsc{Demonstrator} project is to search for 0$\nu\beta\beta$ decay in $^{76}\mathrm{Ge}$. Of all candidate isotopes for 0$\nu\beta\beta$, $^{76}\mathrm{Ge}$ has some of the most favorable characteristics. Germanium detectors are a well established technology, and in searches for 0$\nu\beta\beta$, the high purity germanium crystal acts simultaneously as source and detector. Furthermore, p-type germanium detectors provide excellent energy resolution and a specially designed point contact geometry allows for sensitive pulse shape discrimination. This paper will summarize the experiences the \textsc{Majorana} collaboration made with enriched germanium detectors manufactured by ORTEC$^{\circledR}$. The process from production, to characterization and integration in \textsc{Majorana} mounting structure will be described. A summary of the performance of all enriched germanium detectors will be given., Comment: 10 pages, 8 figures

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

Author

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

Subjects
Physics, Particle physics, Physics - Instrumentation and Detectors, Physics::Instrumentation and Detectors, business.industry, Detector, FOS: Physical sciences, Instrumentation and Detectors (physics.ins-det), Modular design, Reduction (complexity), MAJORANA, Double beta decay, Neutrino, business, Event (particle physics), Data reduction
Abstract

The MAJORANA Collaboration is constructing the MAJORANA DEMONSTRATOR, an ultra-low background, 40-kg modular HPGe detector array to search for neutrinoless double beta decay in 76Ge. In view of the next generation of tonne-scale Ge-based 0nbb-decay searches that will probe the neutrino mass scale in the inverted-hierarchy region, a major goal of the MAJORANA DEMONSTRATOR is to demonstrate a path forward to achieving a background rate at or below 1 count/tonne/year in the 4 keV region of interest around the Q-value at 2039 keV. The background rejection techniques to be applied to the data include cuts based on data reduction, pulse shape analysis, event coincidences, and time correlations. The Point Contact design of the DEMONSTRATOR 0s germanium detectors allows for significant reduction of gamma background., 4 pages, 2 figures

Published
2015

34. Low background signal readout electronics for the MAJORANA DEMONSTRATOR

Author

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

Subjects
Physics, Physics - Instrumentation and Detectors, Detector, FOS: Physical sciences, Readout electronics, Instrumentation and Detectors (physics.ins-det), Signal, Semiconductor detector, Nuclear physics, MAJORANA, Double beta decay, Nuclear Experiment (nucl-ex), Hpge detector, Nuclear Experiment, Scale down
Abstract

The MAJORANA Collaboration will seek neutrinoless double beta decay (0nbb) in 76Ge using isotopically enriched p-type point contact (PPC) high purity Germanium (HPGe) detectors. A tonne-scale array of HPGe detectors would require background levels below 1 count/ROI-tonne-year in the 4 keV region of interest (ROI) around the 2039 keV Q-value of the decay. In order to demonstrate the feasibility of such an experiment, the MAJORANA DEMONSTRATOR, a 40 kg HPGe detector array, is being constructed with a background goal of, 6 pages, 7 figures, 2 tables. LRT 2015 Proceedings

Published
2015

35. Low Background Signal Readout Electronics for the Majorana Demonstrator

Author

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

Subjects
Physics, History, Physics - Instrumentation and Detectors, Isotopes of germanium, business.industry, Detector, Electrical engineering, FOS: Physical sciences, Instrumentation and Detectors (physics.ins-det), Particle detector, Computer Science Applications, Education, Semiconductor detector, MAJORANA, Double beta decay, Electronics, Nuclear Experiment (nucl-ex), business, Nuclear Experiment, Radioactive decay
Abstract

The MAJORANA DEMONSTRATOR is a planned 40 kg array of Germanium detectors intended to demonstrate the feasibility of constructing a tonne-scale experiment that will seek neutrinoless double beta decay ($0\nu\beta\beta$) in $^{76}\mathrm{Ge}$. Such an experiment would require backgrounds of less than 1 count/tonne-year in the 4 keV region of interest around the 2039 keV Q-value of the $\beta\beta$ decay. Designing low-noise electronics, which must be placed in close proximity to the detectors, presents a challenge to reaching this background target. This paper will discuss the MAJORANA collaboration's solutions to some of these challenges.

Published
2015

36. Status of the MAJORANA DEMONSTRATOR: A search for neutrinoless double-beta decay

Author

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

Subjects
Physics, Nuclear and High Energy Physics, Antiparticle, Particle physics, media_common.quotation_subject, High Energy Physics::Phenomenology, Astronomy and Astrophysics, Fermion, Lepton number, Asymmetry, Atomic and Molecular Physics, and Optics, Nuclear physics, MAJORANA, Double beta decay, High Energy Physics::Experiment, Neutron, Neutrino, media_common
Abstract

If neutrinos are Majorana particles, i.e. fermions that are their own antiparticles, then neutrinoless double-beta (0νββ) decay is possible. In such a process, two neutrons can simultaneously decay into two protons and two electrons without emitting neutrinos. Neutrinos being Majorana particles would explicitly violate lepton number conservation, and might play a role in the matter–antimatter asymmetry in the universe. The MAJORANA DEMONSTRATOR experiment is under construction at the Sanford Underground Research Facility in Lead, SD and will search for the neutrinoless double-beta (0νββ) decay of the 76Ge isotope. The goal of the experiment is to demonstrate that it is possible to achieve a sufficiently low background rate in the 4 keV region of interest (ROI) around the 2039 keV Q-value to justify building a tonne-scale experiment. In this paper, we discuss the physics and design of the MAJORANA DEMONSTRATOR, its approach to achieving ultra-low background and the status of the experiment.

Published
2015

37. Data quality assurance for the Majorana Demonstrator.

Author

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

Published
2020
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38. Initial results from the Majorana Demonstrator.

Author

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

Published
2020
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42. Initial Results from the Majorana Demonstrator.

Author

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

Published
2017
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46. The Urban Deployment Model: A Toolset for the Simulation and Performance Characterization of Radiation Detector Deployments in Urban Environments.

Author

Abgrall N, Ayyad Y, Chow CH, Cooper R, Hellfeld D, and Rofors E

Abstract

Static and mobile radiation detectors can be deployed in urban environments for a range of nuclear security applications, including radiological source search-and-tracking scenarios. Modeling detector performance for such applications is challenging, as it does not depend solely on the detector capabilities themselves. Many factors must be taken into consideration, including specific source and background signatures, the topology and constraints of the deployment environment, the presence of nuisance sources, and whether detectors are mobile or static. When considering the simultaneous deployment of multiple, heterogeneous detectors, assessment of the system-wide performance requires the simulation of the individual detectors, and a system-level analysis of the detection performance. In radiological source search-and-tracking scenarios, performance is mostly dominated by the probability of encounter, which depends on the specifics of a given deployment, e.g., static vs. mobile detectors or a combination of both modalities, the number of detectors deployed, the dynamic vs. static setting of false alarm rates, and individual vs. networked operation. The Urban Deployment Model (UDM) toolset was specifically developed to cover the gap in the available generic frameworks for the simulation of radiation detector deployments at city scales. UDM provides a unified and modular framework to support the simulation and performance characterization of heterogeneous detector deployments in urban environments. This paper presents the key components along the UDM workflow.

Published
2024
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47. Search for Neutrinoless Double-β Decay in ^{76}Ge with the Majorana Demonstrator.

Author

Aalseth CE, Abgrall N, Aguayo E, Alvis SI, Amman M, Arnquist IJ, Avignone FT, Back HO, Barabash AS, Barbeau PS, Barton CJ, Barton PJ, Bertrand FE, Bode T, Bos B, Boswell M, Bradley AW, Brodzinski RL, Brudanin V, Busch M, Buuck M, Caldwell AS, Caldwell TS, Chan YD, Christofferson CD, Chu PH, Collar JI, Combs DC, Cooper RJ, Cuesta C, Detwiler JA, Doe PJ, Dunmore JA, Efremenko Y, Ejiri H, Elliott SR, Fast JE, Finnerty P, Fraenkle FM, Fu Z, Fujikawa BK, Fuller E, Galindo-Uribarri A, Gehman VM, Gilliss T, Giovanetti GK, Goett J, Green MP, Gruszko J, Guinn IS, Guiseppe VE, Hallin AL, Haufe CR, Hehn L, Henning R, Hoppe EW, Hossbach TW, Howe MA, Jasinski BR, Johnson RA, Keeter KJ, Kephart JD, Kidd MF, Knecht A, Konovalov SI, Kouzes RT, LaFerriere BD, Leon J, Lesko KT, Leviner LE, Loach JC, Lopez AM, Luke PN, MacMullin J, MacMullin S, Marino MG, Martin RD, Massarczyk R, McDonald AB, Mei DM, Meijer SJ, Merriman JH, Mertens S, Miley HS, Miller ML, Myslik J, Orrell JL, O'Shaughnessy C, Othman G, Overman NR, Perumpilly G, Pettus W, Phillips DG, Poon AWP, Pushkin K, Radford DC, Rager J, Reeves JH, Reine AL, Rielage K, Robertson RGH, Ronquest MC, Ruof NW, Schubert AG, Shanks B, Shirchenko M, Snavely KJ, Snyder N, Steele D, Suriano AM, Tedeschi D, Tornow W, Trimble JE, Varner RL, Vasilyev S, Vetter K, Vorren K, White BR, Wilkerson JF, Wiseman C, Xu W, Yakushev E, Yaver H, Young AR, Yu CH, Yumatov V, Zhitnikov I, Zhu BX, and Zimmermann S

Abstract

The Majorana Collaboration is operating an array of high purity Ge detectors to search for neutrinoless double-β decay in ^{76}Ge. The Majorana Demonstrator comprises 44.1 kg of Ge detectors (29.7 kg enriched in ^{76}Ge) split between two modules contained in a low background shield at the Sanford Underground Research Facility in Lead, South Dakota. Here we present results from data taken during construction, commissioning, and the start of full operations. We achieve unprecedented energy resolution of 2.5 keV FWHM at Q_{ββ} and a very low background with no observed candidate events in 9.95 kg yr of enriched Ge exposure, resulting in a lower limit on the half-life of 1.9×10^{25}  yr (90% C.L.). This result constrains the effective Majorana neutrino mass to below 240-520 meV, depending on the matrix elements used. In our experimental configuration with the lowest background, the background is 4.0_{-2.5}^{+3.1}  counts/(FWHM t yr).

Published
2018
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48. New Limits on Bosonic Dark Matter, Solar Axions, Pauli Exclusion Principle Violation, and Electron Decay from the Majorana Demonstrator.

Author

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

Abstract

We present new limits on exotic keV-scale physics based on 478 kg d of Majorana Demonstrator commissioning data. Constraints at the 90% confidence level are derived on bosonic dark matter (DM) and solar axion couplings, Pauli exclusion principle violating (PEPV) decay, and electron decay using monoenergetic peak signal limits above our background. Our most stringent DM constraints are set for 11.8 keV mass particles, limiting g&#95;{Ae}<4.5×10^{-13} for pseudoscalars and (α^{'}/α)<9.7×10^{-28} for vectors. We also report a 14.4 keV solar axion coupling limit of g&#95;{AN}^{eff}×g&#95;{Ae}<3.8×10^{-17}, a 1/2β^{2}<8.5×10^{-48} limit on the strength of PEPV electron transitions, and a lower limit on the electron lifetime of τ&#95;{e}>1.2×10^{24}  yr for e^{-}→ invisible.

Published
2017
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