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  • Buuck, M  (5)
  • Chu, P-H  (5)
  • 2020-2024  (5)
Material
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Language
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  • 2020-2024  (5)
Year
  • 1
    Online Resource
    Online Resource
    Design improvements to cables and connectors in the Majorana Demonstrator
    IOP Publishing ; 2020
    In:  Journal of Physics: Conference Series Vol. 1342, No. 1 ( 2020-01-01), p. 012129-
    Details
    In: Journal of Physics: Conference Series, IOP Publishing, Vol. 1342, No. 1 ( 2020-01-01), p. 012129-
    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.
    Type of Medium: Online Resource
    ISSN: 1742-6588 , 1742-6596
    URL: Article
    DOI: 10.1088/1742-6596/1342/1/012129
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 2020
    detail.hit.zdb_id: 2166409-2
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  • 2
    Online Resource
    Online Resource
    Initial results from the Majorana Demonstrator
    IOP Publishing ; 2020
    In:  Journal of Physics: Conference Series Vol. 1342, No. 1 ( 2020-01-01), p. 012023-
    Details
    In: Journal of Physics: Conference Series, IOP Publishing, Vol. 1342, No. 1 ( 2020-01-01), p. 012023-
    Abstract: The Majorana Collaboration has assembled an array of high purity Ge detectors to search for neutrinoless double-beta decay in 76 Ge with the goal of establishing the required background and scalability of a Ge-based next-generation ton-scale experiment. The Majorana Demonstrator consists of 44 kg of high-purity Ge (HPGe) detectors (30 kg enriched in 76 Ge) with a low-noise p-type point contact (PPC) geometry. The detectors are split between two modules which are contained in a single lead and high-purity copper shield at the Sanford Underground Research Facility in Lead, South Dakota. Following a commissioning run that started in June 2015, the full detector array has been acquiring data since August 2016. We will discuss the status of the Majorana Demonstrator and initial results from the first physics run; including current background estimates, exotic low-energy physics searches, projections on the physics reach of the Demonstrator, and implications for a ton-scale Ge-based neutrinoless double-beta decay search.
    Type of Medium: Online Resource
    ISSN: 1742-6588 , 1742-6596
    URL: Article
    DOI: 10.1088/1742-6596/1342/1/012023
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 2020
    detail.hit.zdb_id: 2166409-2
    Location Call Number Limitation Availability
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  • 3
    Online Resource
    Online Resource
    Progress Toward A 2νββ Measurement For The Majorana Demonstrator
    IOP Publishing ; 2020
    In:  Journal of Physics: Conference Series Vol. 1342, No. 1 ( 2020-01-01), p. 012117-
    Details
    In: Journal of Physics: Conference Series, IOP Publishing, Vol. 1342, No. 1 ( 2020-01-01), p. 012117-
    Abstract: The MAJORANA DEMONSTRATOR is a 76 Ge-based neutrinoless double-beta decay (0 νββ ) 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 (2 νββ ) of 76 Ge. For Ge detectors, having superior energy resolution (0.1%), this mode poses negligible background to the 0 νββ mode, even for a ton-scale experiment. However, the measurement of the 2 νββ mode allows for careful systematics checks of active detector mass, enrichment fraction, and pulse shape discrimination cuts related to both the 0 νββ and 2 νββ decay modes. A precision measurement of the 2 νββ shape also allows searches for spectral distortions, possibly indicative of new physics, including 0 νββχ . Work is underway to construct a full experimental background model enabling a Bayesian fit to the measured energy spectrum and extraction of a precise 2 νββ spectrum and half-life.
    Type of Medium: Online Resource
    ISSN: 1742-6588 , 1742-6596
    URL: Article
    DOI: 10.1088/1742-6596/1342/1/012117
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 2020
    detail.hit.zdb_id: 2166409-2
    Location Call Number Limitation Availability
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  • 4
    Online Resource
    Online Resource
    Data quality assurance for the Majorana Demonstrator
    IOP Publishing ; 2020
    In:  Journal of Physics: Conference Series Vol. 1342, No. 1 ( 2020-01-01), p. 012123-
    Details
    In: Journal of Physics: Conference Series, IOP Publishing, Vol. 1342, No. 1 ( 2020-01-01), p. 012123-
    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.
    Type of Medium: Online Resource
    ISSN: 1742-6588 , 1742-6596
    URL: Article
    DOI: 10.1088/1742-6596/1342/1/012123
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 2020
    detail.hit.zdb_id: 2166409-2
    Location Call Number Limitation Availability
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    crossrefExt
  • 5
    Online Resource
    Online Resource
    Spectral analysis for the Majorana Demonstrator experiment
    IOP Publishing ; 2020
    In:  Journal of Physics: Conference Series Vol. 1342, No. 1 ( 2020-01-01), p. 012026-
    Details
    In: Journal of Physics: Conference Series, IOP Publishing, Vol. 1342, No. 1 ( 2020-01-01), p. 012026-
    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 Ge-enriched germanium detectors totaling 44.1kg (29.7kg 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 0νββ- decay search due to improvements in shielding. We discuss the statistical approaches to search for a धνββ-signal and derive the physics sensitivity for an expected exposure of 10kg· y from enriched detectors using a profile likelihood based hypothesis test in combination with toy Monte Carlo data.
    Type of Medium: Online Resource
    ISSN: 1742-6588 , 1742-6596
    URL: Article
    DOI: 10.1088/1742-6596/1342/1/012026
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 2020
    detail.hit.zdb_id: 2166409-2
    Location Call Number Limitation Availability
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