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You searched on: Author: kevin coakley

Displaying records 21 to 30 of 64 records.
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21. Systematic error in the precision measurement of the mean wavelength of a nearly monochromatic neutron beam due to geometric errors
Published: 12/3/2009
Authors: Kevin J Coakley, Maynard S Dewey, Andrew T Yue, Alexander Laptev
Abstract: Many experiments at neutron scattering facilities require nearly monochromatic neutron beams. In such experiments, one must accurately measure the mean wavelength of the beam. We seek to reduce the systematic uncertainty of this measurement to approx ...

22. An experiment for the precision measurement of the radiative decay mode of the neutron
Published: 10/5/2009
Authors: R Cooper, Christopher D. Bass, E Beise, H Breuer, J Byrne, T E. Chupp, Kevin J Coakley, Maynard S Dewey, B Fisher, Changbo Fu, Thomas R Gentile, M. McGonagle, Hans P Mumm, Jeffrey S Nico, Alan K Thompson, F E. Wietfeldt
Abstract: The neutron typically beta decays into a proton, electron, and antineutrino. In some decays, it can be accompanied by a high energy photon. We recently performed the rst observation of the radiative beta decay branch for the free neutron with phot ...

23. Prospects for a New Cold Neutron Beam Measurement of the Neutron Lifetime
Published: 10/5/2009
Authors: Maynard S Dewey, Kevin J Coakley, David McLarty Gilliam, G. Greene, A. Laptev, Jeffrey S Nico, W M. Snow, F. E Wiefeldt, A. Yue
Abstract: In the most accurate cold neutron beam determination of the neutron lifetime based on the absolute counting of decay protons, the largest uncertainty was attributed to the absolute determination of the capture flux of the cold neutron beam. Currentl ...

24. Pulse Shape Discrimination for a Fast Neutron Detector
Published: 2/9/2009
Authors: Kevin J Coakley, Dominic F. (Dominic F.) Vecchia, Jeffrey S Nico, B Fisher
Abstract: We are developing a detector that uses liquid scintillator loaded with Li-6 for the efficient measurement of fast neutrons and their energy. Such a detector would have both scientific applications such as quantification of neutron energy spectra in u ...

25. Radiative Beta Decay of the Free Neutron
Published: 2/2/2009
Authors: R L Cooper, T E. Chupp, Maynard S Dewey, Thomas R Gentile, Hans P Mumm, Jeffrey S Nico, Alan K Thompson, B M Fisher, I Kremsky, F E. Wietfeldt, E J Beise, H Breuer, K G Kiriluk, J Bryne, Kevin J Coakley, Changbo Fu
Abstract: The theory of quantum electrodynamics predicts that the beta decay of the neutron into a proton, electron, and antineutrino is accompanied by a continuous spectrum of emitted photons described as inner bremsstrahlung. While this phenomenon has been ...

26. Statistical Learning Methods for Neutron Transmission Tomography of Fuel Cells
Published: 7/8/2008
Authors: Kevin J Coakley, Dominic F. (Dominic F.) Vecchia, Daniel S Hussey
Abstract: In a fuel cell, water is formed as a by-product of the reaction between hydrogen and oxygen. As a neutron beam passes through a fuel cell, it can undergo s-wave scattering. For the dry and wet states of a fuel cell, there are spatially varying neutro ...

27. Development of the Aerosol Particle Mass Analyzer
Published: 10/17/2007
Authors: Nobuhiko Fukushima, Naoko Tajima, Kensei Ehara, Hiromu Sakurai, Kevin J Coakley
Abstract: The Aerosol Particle Mass Analyzer (APM), can classify particles according to their mass-to-charge ratio. The utility of the APM has been confirmed; the APM has been applied to atmospheric aerosol research and engine exhaust measurements. The operati ...

28. Analysis of uncertainty in particle mass measurement using an aerosol particle mass analyzer
Published: 9/9/2007
Authors: Kensei Ehara, Hiromu Sakurai, Akira Yabe, Naoko Tajima, Kevin J Coakley
Abstract: The aerosol particle mass analyzer (APM) classifies aerosol particles according to their mass-to-charge ratio (Ehara et al., 1996). Particle mass can be measured by use of the APM in combination with a condensation particle counter. Being a balance m ...

29. Optimal Ion Trapping Experiment
Published: 5/10/2007
Author: Kevin J Coakley
Abstract: In each run of an experiment, ions are confined in a trap for duration {\tau}. After the trapping stage, ions are purged and detected. The detector provides incomplete information because it goes dead after detecting the first trapped ion. There is a ...

30. Feasibility of Coded Source Neutron Transmission Tomography
Published: 1/1/2007
Authors: Kevin J Coakley, Daniel S Hussey
Abstract: In a simulation experiment, we study the feasibility of coded source neutron transmission tomography for imaging water density in fuel cells at the NIST neutron imaging facility. In standard two-dimensional transmission tomography, one reconstructs a ...

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