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3 3.0

The Majorana Demonstrator search for neutrinoless double beta decay

Jun 29, 2018 06/18

by C. Cuesta; M. Buuck; J. A. Detwiler; J. Gruszko; I. S. Guinn; J. Leon; R. G. H. Robertson; N. Abgrall; A. W. Bradley; Y-D. Chan; S. Mertens; A. W. P. Poon; K. Vetter; I. J. Arnquist; E. W. Hoppe; R. T. Kouzes; J. L. Orrell; F. T. Avignone; A. S. Barabash; S. I. Konovalov; V. Yumatov; F. E. Bertrand; A. Galindo-Uribarri; D. C. Radford; R. L. Varner; C. -H. Yu; V. Brudanin; M. Shirchenko; S. Vasilyev; E. Yakushev; I. Zhitnikov; M. Busch; T. S. Caldwell; T. Gilliss; R. Henning; M. A. Howe; J....

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The MAJORANA Collaboration is constructing the MAJORANA DEMONSTRATOR, an ultra-low background, modular, HPGe detector array with a mass of 44.8-kg (29.7 kg enriched >88% in Ge-76) to search for neutrinoless double beta decay in Ge-76. The next generation of tonnescale Ge-based neutrinoless double beta decay searches will probe the neutrino mass scale in the inverted-hierarchy region. The MAJORANA DEMONSTRATOR is envisioned to demonstrate a path forward to achieve a background rate at or...
Topics: Nuclear Experiment, Physics, Instrumentation and Detectors
Source: http://arxiv.org/abs/1608.07340

Arxiv.org

3 3.0

Background model for the MAJORANA DEMONSTRATOR

Jun 29, 2018 06/18

by C. Cuesta; N. Abgrall; I. J. Arnquist; F. T. Avignone; 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; J. A. Detwiler; C. Dunagan; Yu. Efremenko; H. Ejiri; S. R. Elliott; A. Fullmer; A. Galindo-Uribarri; T. Gilliss; G. K. Giovanetti; M. P. Green; J. Gruszko; I. S. Guinn; V. E. Guiseppe; R. Henning; E. W. Hoppe; M. A. Howe; B. R. Jasinski; K. J. Keeter; M. F. Kidd; S. I. Konovalov; R. T. Kouzes; J. Leon;...

eye 3

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The MAJORANA Collaboration is constructing a system containing 44 kg of high-purity Ge (HPGe) detectors to demonstrate the feasibility and potential of a future tonne-scale experiment capable of probing the neutrino mass scale to ~15 meV. 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 count/(ROI-t-y) in the 4 keV region of interest (ROI) around the Q-value at 2039 keV. This goal is pursued through a...
Topics: Nuclear Experiment, Physics, Instrumentation and Detectors
Source: http://arxiv.org/abs/1610.01146

Arxiv.org

10 10.0

Delayed charge recovery discrimination of passivated surface alpha events in P-type point-contact detectors

Jun 29, 2018 06/18

by J. Gruszko; N. Abgrall; I. J. Arnquist; F. T. Avignone; 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; S. R. Elliott; A. Fullmer; A. Galindo-Uribarri; T. Gilliss; G. K. Giovanetti; M. P. Green; I. S. Guinn; V. E. Guiseppe; R. Henning; E. W. Hoppe; M. A. Howe; B. R. Jasinski; K. J. Keeter; M. F. Kidd; S. I. Konovalov; R. T. Kouzes; J. Leon;...

eye 10

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The Majorana Demonstrator searches for neutrinoless double-beta decay of $^{76}$Ge using arrays of high-purity germanium detectors. If observed, this process would demonstrate that lepton number is not a conserved quantity in nature, with implications for grand-unification and for explaining the predominance of matter over antimatter in the universe. A problematic background in such large granular detector arrays is posed by alpha particles. In the Majorana Demonstrator, events have been...
Topics: Nuclear Experiment, Physics, Instrumentation and Detectors
Source: http://arxiv.org/abs/1610.03054

Arxiv.org

4 4.0

Impact of ADC non-linearities on the sensitivity to sterile keV neutrinos with a KATRIN-like experiment

Jun 29, 2018 06/18

by K. Dolde; S. Mertens; D. Radford; T. Bode; A. Huber; M. Korzeczek; T. Lasserre; M. Slezak

eye 4

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ADC non-linearities are a major systematic effect in the search for keV-scale sterile neutrinos with tritium $\beta$-decay experiments like KATRIN. They can significantly distort the spectral shape and thereby obscure the tiny kink-like signature of a sterile neutrino. In this work we demonstrate various mitigation techniques to reduce the impact of ADC non-linearities on the tritium $\beta$-decay spectrum to a level of $
Topics: High Energy Physics - Phenomenology, Physics, Instrumentation and Detectors
Source: http://arxiv.org/abs/1608.03158

Arxiv.org

10 10.0

Commissioning of the vacuum system of the KATRIN Main Spectrometer

Jun 29, 2018 06/18

by M. Arenz; M. Babutzka; M. Bahr; J. P. Barrett; S. Bauer; M. Beck; A. Beglarian; J. Behrens; T. Bergmann; U. Besserer; J. Blümer; M. Prall; F. Priester; P. C. -O. Ranitzsch; J. Reich; O. Rest; R. G. H. Robertson; M. Röllig; S. Rosendahl; S. Rupp; M. Rysavy; L. I. Bodine; K. Schlösser; M. Schlösser; K. Schönung; M. Schrank; J. Schwarz; W. Seiler; H. Seitz-Moskaliuk; J. Sentkerestiova; A. Skasyrskaya; M. Slezak; K. Bokeloh; A. Spalek; M. Steidl; N. Steinbrink; M. Sturm; M. Suesser; H. H....

eye 10

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The KATRIN experiment will probe the neutrino mass by measuring the beta-electron energy spectrum near the endpoint of tritium beta-decay. An integral energy analysis will be performed by an electro-static spectrometer (Main Spectrometer), an ultra-high vacuum vessel with a length of 23.2 m, a volume of 1240 m^3, and a complex inner electrode system with about 120000 individual parts. The strong magnetic field that guides the beta-electrons is provided by super-conducting solenoids at both ends...
Topics: Physics, Instrumentation and Detectors
Source: http://arxiv.org/abs/1603.01014

Arxiv.org

6 6.0

Search for Pauli Exclusion Principle Violating Atomic Transitions and Electron Decay with a P-type Point Contact Germanium Detector

Jun 29, 2018 06/18

by N. Abgrall; I. J. Arnquist; F. T. Avignone; A. S. Barabash; F. E. Bertrand; A. W. Bradley; V. Brudanin; M. Busch; M. Buuck; A. S. Caldwell; Y-D. Chan; C. D. Christofferson; P. -H. Chu; C. Cuesta; J. A. Detwiler; C. Dunagan; Yu. Efremenko; H. Ejiri; S. R. Elliott; P. S Finnerty; A. Galindo-Uribarri; T. Gilliss; G. K. Giovanetti; J. Goett; M. P. Green; J. Gruszko; I. S. Guinn; V. E. Guiseppe; R. Henning; E. W. Hoppe; S. Howard; M. A. Howe; B. R. Jasinski; K. J. Keeter; M. F. Kidd; S. I....

eye 6

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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...
Topics: Nuclear Experiment, Physics, Instrumentation and Detectors
Source: http://arxiv.org/abs/1610.06141

Arxiv.org

9 9.0

High voltage testing for the MAJORANA Demonstrator

Jun 29, 2018 06/18

by N. Abgrall; I. J. Arnquist; F. T. Avignone; A. S. Barabash; F. E. Bertrand; A. W. Bradley; V. Brudanin; M. Busch; M. Buuck; D. Byram; A. S. Caldwell; Y-D. Chan; C. D. Christofferson; P. -H. Chu; C. Cuesta; J. A. Detwiler; P. J. Doe; C. Dunagan; Yu. Efremenko; H. Ejiri; S. R. Elliott; Z. Fu; A. Galindo-Uribarri; G. K. Giovanetti; J. Goett; M. P. Green; J. Gruszko; I. S. Guinn; V. E. Guiseppe; R. Henning; E. W. Hoppe; S. Howard; M. A. Howe; B. R. Jasinski; K. J. Keeter; M. F. Kidd; S. I....

eye 9

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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...
Topics: High Energy Physics - Experiment, Nuclear Experiment, Physics, Instrumentation and Detectors
Source: http://arxiv.org/abs/1603.08483

Arxiv.org

7 7.0

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

Jun 29, 2018 06/18

by N. Abgrall; I. J. Arnquist; F. T. Avignone; 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; S. R. Elliott; T. Gilliss; G. K. Giovanetti; J. Goett; M. P. Green; J. Gruszko; I. S. Guinn; V. E. Guiseppe; C. R. S. Haufe; R. Henning; E. W. Hoppe; S. Howard; M. A. Howe; B. R. Jasinski; K. J. Keeter; M. F. Kidd; S. I. Konovalov; R. T. Kouzes; A....

eye 7

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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}
Topics: Nuclear Experiment, Physics, Instrumentation and Detectors
Source: http://arxiv.org/abs/1612.00886

Arxiv.org

4 4.0

The Majorana Demonstrator Radioassay Program

Jun 29, 2018 06/18

by N. Abgrall; I. J. Arnquist; F. T. Avignone; H. O. Back; A. S. Barabash; F. E. Bertrand; M. Boswell; A. W. Bradley; V. Brudanin; M. Busch; M. Buuck; D. Byram; A. S. Caldwell; Y-D. Chan; C. D. Christofferson; P. -H. Chu; C. Cuesta; J. A. Detwiler; J. A. Dunmore; Yu. Efremenko; H. Ejiri; S. R. Elliott; P. Finnerty; A. Galindo-Uribarri; V. M. Gehman; T. Gilliss; G. K. Giovanetti; J. Goett; M. P. Green; J. Gruszko; I. S. Guinn; V. E. Guiseppe; R. Henning; E. W. Hoppe; S. Howard; M. A. Howe; B. R....

eye 4

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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...
Topics: High Energy Physics - Experiment, Nuclear Experiment, Physics, Instrumentation and Detectors
Source: http://arxiv.org/abs/1601.03779

Arxiv.org

12 12

A White Paper on keV Sterile Neutrino Dark Matter

Jun 29, 2018 06/18

by R. Adhikari; M. Agostini; N. Anh Ky; T. Araki; M. Archidiacono; M. Bahr; J. Baur; J. Behrens; F. Bezrukov; P. S. Bhupal Dev; D. Borah; P. S. Rodrigues da Silva; O. Ruchayskiy; N. G. Sanchez; M. Sasaki; N. Saviano; A. Schneider; F. Schneider; T. Schwetz; S. Schönert; S. Scholl; A. Boyarsky; F. Shankar; R. Shrock; N. Steinbrink; L. Strigari; F. Suekane; B. Suerfu; R. Takahashi; N. Thi Hong Van; I. Tkachev; M. Totzauer; A. de Gouvea; Y. Tsai; C. G. Tully; K. Valerius; J. W. F. Valle; D. Venos; M....

eye 12

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We present a comprehensive review of keV-scale sterile neutrino Dark Matter, collecting views and insights from all disciplines involved - cosmology, astrophysics, nuclear, and particle physics - in each case viewed from both theoretical and experimental/observational perspectives. After reviewing the role of active neutrinos in particle physics, astrophysics, and cosmology, we focus on sterile neutrinos in the context of the Dark Matter puzzle. Here, we first review the physics motivation for...
Topics: Astrophysics, High Energy Physics - Phenomenology, Cosmology and Nongalactic Astrophysics,...
Source: http://arxiv.org/abs/1602.04816

Arxiv.org

6 6.0

Initial Results from the MAJORANA DEMONSTRATOR

Jun 29, 2018 06/18

by S. R. Elliott; N. Abgrall; I. J. Arnquist; F. T. Avignone; 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; A. Fullmer; A. Galindo-Uribarri; T. Gilliss; G. K. Giovanetti; M. P. Green; J. Gruszko; I. S. Guinn; V. E. Guiseppe; R. Henning; E. W. Hoppe; M. A. Howe; B. R. Jasinski; K. J. Keeter; M. F. Kidd; S. I. Konovalov; R. T. Kouzes; J. Leon;...

eye 6

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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...
Topics: Instrumentation and Detectors, Nuclear Experiment, Physics, High Energy Physics - Experiment
Source: http://arxiv.org/abs/1610.01210

Arxiv.org

3 3.0

Ferromagnetic resonance study of composite Co/Ni - FeCoB free layers with perpendicular anisotropy

Jun 29, 2018 06/18

by T. Devolder; E. Liu; J. Swerts; S. Couet; T. Lin; S. Mertens; A. Furnemont; G. Kar; J. De Boeck

eye 3

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We study the properties of composite free layers with perpendicular anisotropy. The free layers are made of a soft FeCoB layer ferromagnetically coupled by a variable spacer (Ta, W, Mo) to a very anisotropic [Co/Ni] multilayer embodied in a magnetic tunnel junction meant for spin torque memory applications. For this we use broadband ferromagnetic resonance to follow the field dependence of the acoustical and optical excitation of the composite free layer in both in-plane and out-of-plane...
Topics: Materials Science, Condensed Matter
Source: http://arxiv.org/abs/1609.07863

Arxiv.org

6 6.0

Direct Search for keV Sterile Neutrino Dark Matter with a Stable Dysprosium Target

Jun 29, 2018 06/18

by T. Lasserre; K. Altenmueller; M. Cribier; A. Merle; S. Mertens; M. Vivier

eye 6

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We investigate a new method to search for keV-scale sterile neutrinos that could account for Dark Matter. Neutrinos trapped in our galaxy could be captured on stable $^{163}$Dy if their mass is greater than 2.83 keV. Two experimental realizations are studied, an integral counting of $^{163}$Ho atoms in dysprosium-rich ores and a real-time measurement of the emerging electron spectrum in a dysprosium-based detector. The capture rates are compared to the solar neutrino and radioactive...
Topics: Astrophysics, High Energy Physics - Phenomenology, Cosmology and Nongalactic Astrophysics, High...
Source: http://arxiv.org/abs/1609.04671

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