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Displaying records 51 to 60 of 85 records.
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51. Neutron Interferometric Measusrement of the Scattering Length Difference Between the Triplet and Singlet States of N-3 He.
Topic: Radiation Physics
Published: 6/4/2014
Authors: Michael G Huber, Muhammad Arif, Wei-Chen N. Chen, Thomas R Gentile, Daniel S Hussey, T C Black, D. A. Pushin, F. E Wiefeldt, C.B Shahi, L Yang
Abstract: We report a new determination of the n-Helium-3 scattering length difference Delta b = (−5.411 ± 0.031 (statistical) ± 0.039 (systematic) ) fm between the triplet and singlet states using a neutron interferometer. This revises our previous res ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=916731

52. Neutron Test Results of Preliminary Measurements and Calculations Using a Handheld Instrument
Series: Technical Note (NIST TN)
Report Number: 1788
Topic: Radiation Physics
Published: 3/18/2013
Authors: Leticia S Pibida, Craig Heimbach, Bruce R Norman, Alan K Thompson, Maynard S Dewey
Abstract: Initial neutron measurements and calculations were performed to investigate the response of handheld radionuclide identifiers (RIDs) to neutron sources with different moderators/scattering conditions
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=913333

53. New Methods for Measurement of Neutron Detector Efficiency up to 20 MeV
Topic: Radiation Physics
Published: 12/1/2014
Authors: Fred B Bateman, Allan David Carlson, N. A. Kornilov, S M Grimes, T N Massey, C E Brient, D E. Carter, J E. O'Donnell, R. C. Haight, N Boukharouba
Abstract: A new approach to neutron detector effciency has been taken. A neutron detector has been calibrated with a Cf-252 source at low energy. The calibration was extended to higher neutron energies by use of symetric reactions such as A + A ! (2A - 1) + ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=913634

54. New National Air-Kerma Standard for Low-Energy Electronic Brachytherapy Sources
Series: Journal of Research (NIST JRES)
Report Number: 119.022
Topic: Radiation Physics
Published: 10/6/2014
Authors: Stephen Michael Seltzer, C Michelle O'Brien, Michael G Mitch
Abstract: The purpose of this report is to document the NIST air-kerma measurement standard for the electronic brachytherapy sources, i.e., the Axxent sources of Xoft, Inc., which operate at tube potentials of 50 kV and anode currents of 300 μA. The ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=916273

55. New x-ray measurements shed light on discrepancy between experiment and QED
Topic: Radiation Physics
Published: 12/15/2014
Authors: Lawrence T Hudson, C T Chantler, A.T. Payne, M N Kinnane, John D Gillaspy, L F Smale, Albert Henins, J A Kimpton, E Takacs
Abstract: Quantum Electro-Dynamics (QED) is the best tested theory of our physical world, yet significant disagreements have emerged between attempts to apply QED to exotic atomic systems. A recent 15 parts-per-million (ppm) experiment on muonic hydrogen, in ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=912845

56. Noble Gas Excimer Scintillation Following Neutron Capture in Boron Thin Films
Topic: Radiation Physics
Published: 4/11/2014
Authors: Alan K Thompson, Jacob McComb, Charles W Clark, Michael A. Coplan, Mohamad Al-Sheikhly, Robert Edward Vest
Abstract: Far-ultraviolet (FUV) scintillation signals have been measured in heavy noble gases (argon, krypton, xenon) following boron-neutron capture (10B(n,α)7Li) in 10B thin films. The observed scintillation yields are comparable to the yields from some ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=915257

57. Optimal filtering, record length, and count rate in transition-edge-sensor microcalorimeters
Topic: Radiation Physics
Published: 12/16/2009
Authors: William Bertrand Doriese, Gene C Hilton, Kent D Irwin, Francis Joseph Schima, Joel Nathan Ullom, Joseph S. Adams, Caroline A. Kilbourne
Abstract: In typical algorithms for optimally filtering transition-edge-sensor-microcalorimeter pulses, the average value of a filtered pulse is set to zero. The achieved energy resolution of the detector then depends strongly on the chosen length of the pulse ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=903257

58. Pinhole X -ray camera photos of an ECR ion source plasma
Topic: Radiation Physics
Published: 11/1/2011
Authors: Lawrence T Hudson, Sandor Biri, E Takacs, R. Racz, J. Palinkas
Abstract: A 70 micrometer pinhole and an X-ray CCD camera in single photon counting mode were used to obtain spatially and spectral resolved images of an electron cyclotron resonance (ECR) ion source generated plasma. The method has good spatial resolution as ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=907522

59. Polarized 3HE Spin Filters for Neutron Science
Topic: Radiation Physics
Published: 2/12/2014
Authors: Thomas R Gentile, Wei-Chen N. Chen
Abstract: The large spin dependence of the absorption cross section for neutrons by 3He gas provides a method to polarize neutron beams. For certain applications, such polarized 3He-based neutron "spin filters" have advantages over conventional neutron optica ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=914929

60. Post-Irradiation Study of the Alanine Dosimeter
Series: Journal of Research (NIST JRES)
Topic: Radiation Physics
Published: 7/14/2014
Author: Marc F Desrosiers
Abstract: Post-irradiation stability of high-dose dosimeters has traditionally been an important measurement influence quantity. Though the exceptional stability of the alanine dosimeter response with time has rendered this factor a non-issue for routine work ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=914295



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