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A straw drift chamber spectrometer for studies of rare kaon decays

Sep 22, 2013 09/13

by K. Lang; D. Ambrose; C. Arroyo; M. Bachman; D. Connor; M. Eckhause; K. M. Ecklund; S. Graessle; M. Hamela; S. Hamilton; A. D. Hancock; K. Hartman; M. Hebert; C. H. Hoff; G. W. Hoffmann; G. M. Irwin; J. R. Kane; N. Kanematsu; Y. Kuang; R. Lee; M. Marcin; R. D. Martin; J. McDonough; A. Milder; W. R. Molzon; D. Ouimette; M. Pommot-Maia; M. Proga; P. J. Riley; J. L. Ritchie; P. D. Rubin; V. I. Vassilakopoulos; B. Ware; R. E. Welsh; S. G. Wojcicki; S. Worm

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We describe the design, construction, readout, tests, and performance of planar drift chambers, based on 5 mm diameter copperized Mylar and Kapton straws, used in an experimental search for rare kaon decays. The experiment took place in the high-intensity neutral beam at the Alternating Gradient Synchrotron of Brookhaven National Laboratory, using a neutral beam stop, two analyzing dipoles, and redundant particle identification to remove backgrounds.
Source: http://arxiv.org/abs/physics/0308047v1

Arxiv.org

70 70

Astroparticle Physics with a Customized Low-Background Broad Energy Germanium Detector

Sep 24, 2013 09/13

by MAJORANA Collaboration; C. E. Aalseth; M. Amman; F. T. Avignone III; H. O. Back; A. S. Barabash; P. S. Barbeau; M. Bergevin; F. E. Bertrand; M. Boswell; V. Brudanin; W. Bugg; T. H. Burritt; M. Busch; G. Capps; Y-D. Chan; J. I. Collar; R. J. Cooper; R. Creswick; J. A. Detwiler; J. Diaz; P. J. Doe; Yu. Efremenko; V. Egorov; H. Ejiri; S. R. Elliott; J. Ely; J. Esterline; H. Farach; J. E. Fast; N. Fields; P. Finnerty; B. Fujikawa; E. Fuller; V. M. Gehman; G. K. Giovanetti; V. E. Guiseppe; K. Gusey;...

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The MAJORANA Collaboration is building the MAJORANA DEMONSTRATOR, a 60 kg array of high purity germanium detectors housed in an ultra-low background shield at the Sanford Underground Laboratory in Lead, SD. The MAJORANA DEMONSTRATOR will search for neutrinoless double-beta decay of 76Ge while demonstrating the feasibility of a tonne-scale experiment. It may also carry out a dark matter search in the 1-10 GeV/c^2 mass range. We have found that customized Broad Energy Germanium (BEGe) detectors...
Source: http://arxiv.org/abs/1007.3231v2

Arxiv.org

68 68

Characteristics of Signals Originating Near the Lithium-Diffused N+ Contact of High Purity Germanium P-Type Point Contact Detectors

Sep 20, 2013 09/13

by The MAJORANA Collaboration; E. Aguayo; M. Amman; F. T. Avignone III; A. S. Barabash; P. J. Barton; J. R. Beene; 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; A. Galindo-Uribarri; V. M. Gehman; G. K. Giovanetti; M. P. Green; V. E. Guiseppe; K. Gusey; A. L. Hallin; R. Hazama;...

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A study of signals originating near the lithium-diffused n+ contact of p-type point contact (PPC) high purity germanium detectors (HPGe) is presented. The transition region between the active germanium and the fully dead layer of the n+ contact is examined. Energy depositions in this transition region are shown to result in partial charge collection. This provides a mechanism for events with a well defined energy to contribute to the continuum of the energy spectrum at lower energies. A novel...
Source: http://arxiv.org/abs/1207.6716v1

Arxiv.org

58 58

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

Sep 23, 2013 09/13

by 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;...

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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 ~5200 mwe is required for a tonne-scale experiment with a compact shield similar to the planned 40-kg MAJORANA DEMONSTRATOR. The...
Source: http://arxiv.org/abs/1109.4154v2

Arxiv.org

52 52

Determining the Drift Time of Charge Carriers in P-Type Point-Contact HPGe Detectors

Sep 23, 2013 09/13

by R. D. Martin; M. Amman; Y. D. Chan; J. A. Detwiler; J. C. Loach; Q. Looker; P. N. Luke; A. W. P. Poon; J. Qian; K. Vetter; H. Yaver

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An algorithm to measure the drift time of charge carriers in p-type point contact (PPC) high-purity germanium (HPGe) detectors from the signals processed with a charge-sensitive preamplifier is introduced. It is demonstrated that the drift times can be used to estimate the distance of charge depositions from the point contact and to characterize losses due to charge trapping. A correction for charge trapping effects over a wide range of energies is implemented using the measured drift times and...
Source: http://arxiv.org/abs/1110.0131v1

Arxiv.org

50 50

First Observation of the Rare Decay Mode K-long -> e+ e-

Sep 20, 2013 09/13

by BNL E871 Collaboration; D. Ambrose; C. Arroyo; M. Bachman; P. de Cecco; D. Connor; M. Eckhause; K. M. Ecklund; S. Graessle; A. D. Hancock; K. Hartman; M. Hebert; C. H. Hoff; G. W. Hoffmann; G. M. Irwin; J. R. Kane; N. Kanematsu; Y. Kuang; K. Lang; R. Lee; R. D. Martin; J. McDonough; A. Milder; W. R. Molzon; M. Pommot-Maia; P. J. Riley; J. L. Ritchie; P. D. Rubin; V. I. Vassilakopoulos; C. B. Ware; R. E. Welsh; S. G. Wojcicki; E. Wolin; S. Worm

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In an experiment designed to search for and study very rare two-body decay modes of the K-long, we have observed four examples of the decay K-long -> e+ e-, where the expected background is 0.17+-0.10 events. This observation translates into a branching fraction of 8.7^{+5.7}_{-4.1} X 10^{-12}, consistent with recent theoretical predictions. This result represents by far the smallest branching fraction yet measured in particle physics.
Source: http://arxiv.org/abs/hep-ex/9810007v1

Arxiv.org

46 46

The MAJORANA DEMONSTRATOR: A Search for Neutrinoless Double-beta Decay of Germanium-76

Sep 23, 2013 09/13

by 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;...

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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...
Source: http://arxiv.org/abs/1109.1567v1

Arxiv.org

57 57

The MAJORANA DEMONSTRATOR: Progress towards showing the feasibility of a tonne-scale 76Ge neutrinoless double-beta decay experiment

Sep 22, 2013 09/13

by P. Finnerty; E. Aguayo; M. Amman; F. T. Avignone. III; A. S. Barabash; P. J. Barton; J. R. Beene; 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; F. M. Fraenkle; A. Galindo-Uribarri; V. M. Gehman; G. K. Giovanetti; M. P. Green; V. E. Guiseppe; K. Gusey; A. L. Hallin; R. Hazama; R. Henning; E. W. Hoppe;...

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The MAJORANA DEMONSTRATOR will search for the neutrinoless double-beta decay of the 76Ge isotope with a mixed array of enriched and natural germanium detectors. The observation of this rare decay would indicate the neutrino is its own anti-particle, demonstrate that lepton number is not conserved, and provide information on the absolute mass-scale of the neutrino. The DEMONSTRATOR is being assembled at the 4850 foot level of the Sanford Underground Research Facility in Lead, South Dakota. The...
Source: http://arxiv.org/abs/1210.2678v1

Arxiv.org

73 73

The Majorana Demonstrator

Sep 23, 2013 09/13

by 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....

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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.
Source: http://arxiv.org/abs/1109.6913v1

Arxiv.org

53 53

The Majorana experiment: an ultra-low background search for neutrinoless double-beta decay

Sep 23, 2013 09/13

by 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....

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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...
Source: http://arxiv.org/abs/1111.5578v1

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