oalib

Publish in OALib Journal

ISSN: 2333-9721

APC: Only $99

Submit

Any time

2019 ( 190 )

2018 ( 288 )

2017 ( 313 )

2016 ( 388 )

Custom range...

Search Results: 1 - 10 of 138730 matches for " K. Keeter "
All listed articles are free for downloading (OA Articles)
Page 1 /138730
Display every page Item
Differential cross sections for pion charge exchange on the proton at 27.5 MeV
E. Frlez,D. Pocanic,K. A. Assamagan,J. P. Chen,K. J. Keeter,R. M. Marshall,R. C. Minehart,L. C. Smith,G. E. Dodge,S. S. Hanna,B. H. King,J. N. Knudson
Physics , 1997, DOI: 10.1103/PhysRevC.57.3144
Abstract: We have measured pion single charge exchange differential cross sections on the proton at 27.5 MeV incident $\pi^-$ kinetic energy in the center of momentum angular range between $0^\circ$ and $55^\circ$. The extracted cross sections are compared with predictions of the standard pion-nucleon partial wave analysis and found to be in excellent agreement.
The calibration of the Sudbury Neutrino Observatory using uniformly distributed radioactive sources
K. Boudjemline,B. Cai,B. T. Cleveland,H. C. Evans,G. T. Ewan,J. Farine,R. J. Ford,E. Guillian,A. L. Hallin,E. D. Hallman,C. Howard,P. Jagam,N. A. Jelley,K. J. Keeter,J. R. Klein,C. Kraus,C. B. Krauss,R. Lange,I. T. Lawson,J. R. Leslie,J. C. Loach,A. B. McDonald,G. McGregor,A. J. Noble,H. M. O'Keeffe,S. J. M. Peeters,A. W. P. Poon,S. D. Reitzner,K. Rielage,R. G. H. Robertson,V. L. Rusu,S. R. Seibert,P. Skensved,M. J. Thomson
Physics , 2009, DOI: 10.1016/j.nima.2010.03.100
Abstract: The production and analysis of distributed sources of 24Na and 222Rn in the Sudbury Neutrino Observatory (SNO) are described. These unique sources provided accurate calibrations of the response to neutrons, produced through photodisintegration of the deuterons in the heavy water target, and to low energy betas and gammas. The application of these sources in determining the neutron detection efficiency and response of the 3He proportional counter array, and the characteristics of background Cherenkov light from trace amounts of natural radioactivity is described.
Status Update of the MAJORANA DEMONSTRATOR Neutrinoless Double Beta Decay Experiment
Julieta Gruszko,Nicolas Abgrall,Isaac Arnquist,Frank Avignone III,Alexander Barabash,Fred Bertrand,Adam Bradley,Viktor Brudanin,Matthew Busch,Micah Buuck,Dana Byram,Adam Caldwell,Yuen-Dat Chan,Cabot-Ann Christofferson,Pinghan Chu,Clara Cuesta,Jason Detwiler,Colter Dunagan,Yuri Efremenko,Hiroyasu Ejiri,Steven Elliott,Alfredo Galindo-Uribarri,Tom Gilliss,Graham K. Giovanetti,Johnny Goett,Matthew P. Green,Ian Guinn,Vince Guiseppe,Reyco Henning,Eric Hoppe,Stanley Howard,Mark Howe,Ben Jasinski,Kara Keeter,Mary Kidd,Sergey Konovalov,Richard T. Kouzes,Brian LaFerriere,Jonathan Leon,Jacqueline MacMullin,Ryan Martin,Ralph Massarczyk,Sam Meijer,Susanne Mertens,Christopher OShaughnessy,John Orrell,Alan Poon,David Radford,Jamin Rager,Keith Rielage,R. G. Hamish Robertson,Elisa Romero-Romero,Benjamin Shanks,Mark Shirchenko,Nathan Snyder,Anne-Marie Suriano,David Tedeschi,Jim Trimble,Robert Varner,Sergey Vasilyev,Kai Vetter,Kris Vorren,Brandon White,John F. Wilkerson,Clint Wiseman,Wenqin Xu,E. Yakushev,Chang-Hong Yu,Vladimir Yumatov,Igor Zhitnikov
Physics , 2015,
Abstract: Neutrinoless double beta decay searches play a major role in determining neutrino properties, in particular the Majorana or Dirac nature of the neutrino and the absolute scale of the neutrino mass. The consequences of these searches go beyond neutrino physics, with implications for Grand Unification and leptogenesis. The \textsc{Majorana} Collaboration is assembling a low-background array of high purity Germanium (HPGe) detectors to search for neutrinoless double-beta decay in $^{76}$Ge. The \textsc{Majorana Demonstrator}, which is currently being constructed and commissioned at the Sanford Underground Research Facility in Lead, South Dakota, will contain 44 kg (30 kg enriched in $^{76}$Ge) of HPGe detectors. Its primary goal is to demonstrate the scalability and background required for a tonne-scale Ge experiment. This is accomplished via a modular design and projected background of less than 3 cnts/tonne-yr in the region of interest. The experiment is currently taking data with the first of its enriched detectors.
Depth Requirements for a Tonne-scale 76Ge Neutrinoless Double-beta Decay Experiment
The MAJORANA Collaboration,E. Aguayo,F. T. Avignone III,H. O. Back,A. S. Barabash,M. Bergevin,F. E. Bertrand,M. Boswell,V. Brudanin,M. Busch,Y-D. Chan,C. D. Christofferson,J. I. Collar,D. C. Combs,R. J. Cooper,J. A. Detwiler,P. J. Doe,Yu. Efremenko,V. Egorov,H. Ejiri,S. R. Elliott,J. Esterline,J. E. Fast,N. Fields,P. Finnerty,F. M. Fraenkle,V. M. Gehman,G. K. Giovanetti,M. P. Green,V. E. Guiseppe,K. Gusey,A. L. Hallin,R. Hazama,R. Henning,A. Hime,E. W. Hoppe,M. Horton,S. Howard,M. A. Howe,R. A. Johnson,K. J. Keeter,M. E. Keillor,C. Keller,J. D. Kephart,M. F. Kidd,A. Knecht,O. Kochetov,S. I. Konovalov,R. T. Kouzes,B. D. LaFerriere,B. H. LaRoque,J. Leon,L. E. Leviner,J. C. Loach,S. MacMullin,M. G. Marino,R. D. Martin,D. -M. Mei,J. H. Merriman,M. L. Miller,L. Mizouni,M. Nomachi,J. L. Orrell,N. R. Overman,D. G. Phillips II,A. W. P. Poon,G. Perumpilly,G. Prior,D. C. Radford,K. Rielage,R. G. H. Robertson,M. C. Ronquest,A. G. Schubert,T. Shima,M. Shirchenko,K. J. Snavely,V. Sobolev,D. Steele,J. Strain,K. Thomas,V. Timkin,W. Tornow,I. Vanyushin,R. L. Varner,K. Vetter,K. Vorren,J. F. Wilkerson,B. A. Wolfe,E. Yakushev,A. R. Young,C. -H. Yu,V. Yumatov,C. Zhang
Physics , 2011,
Abstract: Neutrinoless double-beta decay experiments can potentially determine the Majorana or Dirac nature of the neutrino, and aid in understanding the neutrino absolute mass scale and hierarchy. Future 76Ge-based searches target a half-life sensitivity of >10^27 y to explore the inverted neutrino mass hierarchy. Reaching this sensitivity will require a background rate of <1 count tonne^-1 y^-1 in a 4-keV-wide spectral region of interest surrounding the Q value of the decay. We investigate the overburden required to reach this background goal in a tonne-scale experiment with a compact (copper and lead) shield based on Monte Carlo calculations of cosmic-ray background rates. We find that, in light of the presently large uncertainties in these types of calculations, a site with an underground depth >~5200 mwe is required for a tonne-scale experiment with a compact shield similar to the planned 40-kg MAJORANA DEMONSTRATOR. The required overburden is highly dependent on the chosen shielding configuration and could be relaxed significantly if, for example, a liquid cryogen and water shield, or an active neutron shield were employed. Operation of the MAJORANA DEMONSTRATOR and GERDA detectors will serve to reduce the uncertainties on cosmic-ray background rates and will impact the choice of shielding style and location for a future tonne-scale experiment. 4/2013: The peer review process revealed that one of the veto rejection factors (the factor-of-4 described on p12) needs to be better established. Our reevaluation of this parameter to date has not yielded strong support for the value stated in the manuscript, and we require further study to develop a solid estimate. This further study will supersede the work described in this manuscript, and may or may not lead to the same conclusion regarding the ~>5200 mwe requirement for future tonne-scale 76Ge neutrinoless double beta decay experiments.
The MAJORANA DEMONSTRATOR: A Search for Neutrinoless Double-beta Decay of Germanium-76
MAJORANA Collaboration,A. G. Schubert,E. Aguayo,F. T. Avignone III,H. O. Back,A. S. Barabash,M. Bergevin,F. E. Bertrand,M. Boswell,V. Brudanin,M. Busch,Y-D. Chan,C. D. Christofferson,J. I. Collar,D. C. Combs,R. J. Cooper,J. A. Detwiler,J. Leon,P. J. Doe,Yu. Efremenko,V. Egorov,H. Ejiri,S. R. Elliott,J. Esterline,J. E. Fast,N. Fields,P. Finnerty,F. M. Fraenkle,V. M. Gehman,G. K. Giovanetti,M. P. Green,V. E. Guiseppe,K. Gusey,A. L. Hallin,R. Hazama,R. Henning,A. Hime,E. W. Hoppe,M. Horton,S. Howard,M. A. Howe,R. A. Johnson,K. J. Keeter,M. E. Keillor,C. Keller,J. D. Kephart,M. F. Kidd,A. Knecht,O. Kochetov,S. I. Konovalov,R. T. Kouzes,B. LaFerriere,B. H. LaRoque,L. E. Leviner,J. C. Loach,S. MacMullin,M. G. Marino,R. D. Martin,D. -M. Mei,J. Merriman,M. L. Miller,L. Mizouni,M. Nomachi,J. L. Orrell,N. Overman,D. G. Phillips II,A. W. P. Poon,G. Perumpilly,G. Prior,D. C. Radford,K. Rielage,R. G. H. Robertson,M. C. Ronquest,T. Shima,M. Shirchenko,K. J. Snavely,V. Sobolev,D. Steele,J. Strain,K. Thomas,V. Timkin,W. Tornow,I. Vanyushin,R. L. Varner,K. Vetter,K. Vorren,J. F. Wilkerson,B. A. Wolfe,E. Yakushev,A. R. Young,C. ?H. Yu,V. Yumatov,C. Zhan
Physics , 2011, DOI: 10.1088/1742-6596/375/1/042010
Abstract: The observation of neutrinoless double-beta decay would determine whether the neutrino is a Majorana particle and provide information on the absolute scale of neutrino mass. The MAJORANA Collaboration is constructing the DEMONSTRATOR, an array of germanium detectors, to search for neutrinoless double-beta decay of 76-Ge. The DEMONSTRATOR will contain 40 kg of germanium; up to 30 kg will be enriched to 86% in 76-Ge. The DEMONSTRATOR will be deployed deep underground in an ultra-low-background shielded environment. Operation of the DEMONSTRATOR aims to determine whether a future tonne-scale germanium experiment can achieve a background goal of one count per tonne-year in a 4-keV region of interest around the 76-Ge neutrinoless double-beta decay Q-value of 2039 keV.
The Majorana Demonstrator
E. Aguayo,J. E. Fast,E. W. Hoppe,M. E. Keillor,J. D. Kephart,R. T. Kouzes,B. D. LaFerriere,J. Merriman,J. L. Orrell,N. R. Overman,F. T. Avignone III,H. O. Back,D. C. Combs,L. E. Leviner,A. R. Young,A. S. Barabash,S. I. Konovalov,I. Vanyushin,V. Yumatov,M. Bergevin,Y-D. Chan,J. A. Detwiler,J. C. Loach,R. D. Martin,A. W. P. Poon,G. Prior,K. Vetter,F. E. Bertrand,R. J. Cooper,D. C. Radford,R. L. Varner,C. -H. Yu,M. Boswell,S. R. Elliott,V. M. Gehman,A. Hime,M. F. Kidd,B. H. LaRoque,K. Rielage,M. C. Ronquest,D. Steele,V. Brudanin,V. Egorov,K. Gusey,O. Kochetov,M. Shirchenko,V. Timkin,E. Yakushev,M. Busch,J. Esterline,W. Tornow,C. D. Christofferson,M. Horton,S. Howard,V. Sobolev,J. I. Collar,N. Fields,R. J. Creswick,P. J. Doe,R. A. Johnson,A. Knecht,J. Leon,M. G. Marino,M. L. Miller,R. G. H. Robertson,A. G. Schubert,B. A. Wolfe,Yu. Efremenko,H. Ejiri,R. Hazama,M. Nomachi,T. Shima,P. Finnerty,F. M. Fraenkle,G. K. Giovanetti,M. P. Green,R. Henning,M. A. Howe,S. MacMullin,D. G. Phillips II,K. J. Snavely,J. Strain,K. Vorren,V. E. Guiseppe,C. Keller,D. -M. Mei,G. Perumpilly,K. Thomas,C. Zhang,A. L. Hallin,K. J. Keeter,L. Mizouni,J. F. Wilkerson
Physics , 2011,
Abstract: A brief review of the history and neutrino physics of double beta decay is given. A description of the MAJORANA DEMONSTRATOR research and development program including background reduction techniques is presented in some detail. The application of point contact (PC) detectors to the experiment is discussed, including the effectiveness of pulse shape analysis. The predicted sensitivity of a PC detector array enriched to 86% in 76Ge is given.
The Majorana experiment: an ultra-low background search for neutrinoless double-beta decay
D. G. Phillips II,E. Aguayo,F. T. Avignone III,H. O. Back,A. S. Barabash,M. Bergevin,F. E. Bertrand,M. Boswell,V. Brudanin,M. Busch,Y. -D. Chan,C. D. Christofferson,J. I. Collar,D. C. Combs,R. J. Cooper,J. A. Detwiler,P. J. Doe,Y. Efremenko,V. Egorov,H. Ejiri,S. R. Elliott,J. Esterline,J. E. Fast,N. Fields,P. Finnerty,F. M. Fraenkle,V. M. Gehman,G. K. Giovanetti,M. P. Green,V. E. Guiseppe,K. Gusey,A. L. Hallin,R. Hazama,R. Henning,A. Hime,E. W. Hoppe,M. Horton,S. Howard,M. A. Howe,R. A. Johnson,K. J. Keeter,C. Keller,M. F. Kidd,A. Knecht,O. Kochetov,S. I. Konovalov,R. T. Kouzes,B. LaFerriere,B. H. LaRoque,J. Leon,L. E. Leviner,J. C. Loach,S. MacMullin,M. G. Marino,R. D. Martin,D. -M. Mei,J. Merriman,M. L. Miller,L. Mizouni,M. Nomachi,J. L. Orrell,N. R. Overman,A. W. P. Poon,G. Perumpilly,G. Prior,D. C. Radford,K. Rielage,R. G. H. Robertson,M. C. Ronquest,A. G. Schubert,T. Shima,M. Shirchenko,K. J. Snavely,D. Steele,J. Strain,K. Thomas,V. Timkin,W. Tornow,I. Vanyushin,R. L. Varner,K. Vetter,K. Vorren,J. F. Wilkerson,B. A. Wolfe,E. Yakushev,A. R. Young,C. -H. Yu,V. Yumatov,C. Zhang
Physics , 2011, DOI: 10.1088/1742-6596/381/1/012044
Abstract: The observation of neutrinoless double-beta decay would resolve the Majorana nature of the neutrino and could provide information on the absolute scale of the neutrino mass. The initial phase of the Majorana experiment, known as the Demonstrator, will house 40 kg of Ge in an ultra-low background shielded environment at the 4850' level of the Sanford Underground Laboratory in Lead, SD. The objective of the Demonstrator is to determine whether a future 1-tonne experiment can achieve a background goal of one count per tonne-year in a narrow region of interest around the 76Ge neutrinoless double-beta decay peak.
Background Model for the Majorana Demonstrator
C. Cuesta,N. Abgrall,E. Aguayo,F. T. Avignone III,A. S. Barabash,F. E. Bertrand,M. Boswell,V. Brudanin,M. Busch,D. Byram,A. S. Caldwell,Y-D. Chan,C. D. Christofferson,D. C. Combs,C. Cuesta,J. A. Detwiler,P. J. Doe,Yu. Efremenko,V. Egorov,H. Ejiri,S. R. Elliott,J. E. Fast,P. Finnerty,F. M. Fraenkle,A. Galindo-Uribarri,G. K. Giovanetti,J. Goett,M. P. Green,J. Gruszko,V. E. Guiseppe,K. Gusev,A. L. Hallin,R. Hazama,A. Hegai,R. Henning,E. W. Hoppe,S. Howard,M. A. Howe,K. J. Keeter,M. F. Kidd,O. Kochetov,S. I. Konovalov,R. T. Kouzes,B. D. LaFerriere,J. Leon,L. E. Leviner,J. C. Loach,J. MacMullin,S. MacMullin,R. D. Martin,S. Meijer,S. Mertens,M. Nomachi,J. L. Orrell,C. O'Shaughnessy,N. R. Overman,D. G. Phillips II,A. W. P. Poon,K. Pushkin,D. C. Radford,J. Rager,K. Rielage,R. G. H. Robertson,E. Romero-Romero,M. C. Ronquest,A. G. Schubert,B. Shanks,T. Shima,M. Shirchenko,K. J. Snavely,N. Snyder,A. M. Suriano,J. Thompson,V. Timkin,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,A. R. Young,C. H. Yu,V. Yumatov
Physics , 2014,
Abstract: The Majorana Collaboration is constructing a system containing 40 kg of HPGe detectors to demonstrate the feasibility and potential of a future tonne-scale experiment capable of probing the neutrino mass scale in the inverted-hierarchy region. To realize this, a major goal of the Majorana Demonstrator is to demonstrate a path forward to achieving a background rate at or below 1 cnt/(ROI-t-y) in the 4 keV region of interest around the Q-value at 2039 keV. This goal is pursued through a combination of a significant reduction of radioactive impurities in construction materials with analytical methods for background rejection, for example using powerful pulse shape analysis techniques profiting from the p-type point contact HPGe detectors technology. The effectiveness of these methods is assessed using simulations of the different background components whose purity levels are constrained from radioassay measurements.
The Majorana Parts Tracking Database
The Majorana Collaboration,N. Abgrall,E. Aguayo,F. T. Avignone III,A. S. Barabash,F. E. Bertrand,V. Brudanin,M. Busch,D. Byram,A. S. Caldwell,Y-D. Chan,C. D. Christofferson,D. C. Combs,C. Cuesta,J. A. Detwiler,P. J. Doe,Yu. Efremenko,V. Egorov,H. Ejiri,S. R. Elliott,J. Esterline,J. E. Fast,P. Finnerty,F. M. Fraenkle,A. Galindo-Uribarri,G. K. Giovanetti,J. Goett,M. P. Green,J. Gruszko,V. E. Guiseppe,K. Gusev,A. L. Hallin,R. Hazama,A. Hegai,R. Henning,E. W. Hoppe,S. Howard,M. A. Howe,K. J. Keeter,M. F. Kidd,O. Kochetov,S. I. Konovalov,R. T. Kouzes,B. D. LaFerriere,J. Diaz Leon,L. E. Leviner,J. C. Loach,J. MacMullin,R. D. Martin,S. J. Meijer,S. Mertens,M. L. Miller,L. Mizouni,M. Nomachi,J. L. Orrell,C. O'Shaughnessy,N. R. Overman,R. Petersburg,D. G. Phillips II,A. W. P. Poon,K. Pushkin,D. C. Radford,J. Rager,K. Rielage,R. G. H. Robertson,E. Romero-Romero,M. C. Ronquest,B. Shanks,T. Shima,M. Shirchenko,K. J. Snavely,N. Snyder,A. Soin,A. M. Suriano,D. Tedeschi,J. Thompson,V. Timkin,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,A. R. Young,C. -H. Yu,V. Yumatov,I. Zhitnikov
Physics , 2015, DOI: 10.1016/j.nima.2015.01.0
Abstract: The Majorana Demonstrator is an ultra-low background physics experiment searching for the neutrinoless double beta decay of $^{76}$Ge. The Majorana Parts Tracking Database is used to record the history of components used in the construction of the Demonstrator. The tracking implementation takes a novel approach based on the schema-free database technology CouchDB. Transportation, storage, and processes undergone by parts such as machining or cleaning are linked to part records. Tracking parts provides a great logistics benefit and an important quality assurance reference during construction. In addition, the location history of parts provides an estimate of their exposure to cosmic radiation. A web application for data entry and a radiation exposure calculator have been developed as tools for achieving the extreme radio-purity required for this rare decay search.
A search for bremsstrahlung solar axions using the Majorana low-background BEGe detector at Kimballton (MALBEK)
N. Abgrall,E. Aguayo,F. T. Avignone III,A. S. Barabash,F. E. Bertrand,M. Boswell,V. Brudanin,M. Busch,A. S. Caldwell,Y-D. Chan,C. D. Christofferson,D. C. Combs,R. J. Cooper,R. J. Creswick,J. A. Detwiler,P. J. Doe,Yu. Efremenko,V. Egorov,S. R. Elliott,J. E. Fast,P. Finnerty,F. M. Fraenkle,A. Galindo-Uribarri,G. K. Giovanetti,J. Goett,M. P. Green,J. Gruszko,V. E. Guiseppe,K. Gusev,A. Hegai,R. Henning,E. W. Hoppe,S. Howard,M. A. Howe,K. J. Keeter,M. F. Kidd,A. Knecht,O. Kochetov,S. I. Konovalov,R. T. Kouzes,B. D. LaFerriere,J. Leon,L. E. Leviner,J. C. Loach,J. MacMullin,S. MacMullin,M. G. Marino,R. D. Martin,S. Mertens,J. L. Orrell,C. O'Shaughnessy,N. R. Overman,D. G. Phillips II,A. W. P. Poon,K. Pushkin,D. C. Radford,K. Rielage,R. G. H. Robertson,M. C. Ronquest,A. G. Schubert,B. Shanks,M. Shirchenko,K. J. Snavely,N. Snyder,D. Steele,A. M. Suriano,J. Thompson,V. Timkin,R. L. Varner,S. Vasilyev,K. Vetter,K. Vorren,B. R. White,J. F. Wilkerson,W. Xu,E. Yakushev,A. R. Young,C. H. Yu,V. Yumatov
Physics , 2014,
Abstract: A low-background, high-purity germanium detector has been used to search for evidence of low-energy, bremsstrahlung-generated solar axions. An upper bound of $1.36\times 10^{-11}$ $(95% CL)$ is placed on the direct coupling of DFSZ model axions to electrons. The prospects for the sensitivity of the Majorana Demonstrator array of point-contact germanium detectors to solar axions are discussed in the context of the model-independent annual modulation due to the seasonal variation of the earth-sun distance.
Page 1 /138730
Display every page Item


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.