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Author: kevin coakley

Displaying records 11 to 20 of 47 records.
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11. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=150628

12. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=150510

13. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=150417

14. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=150523

15. Stochastic Modeling and Estimation in a Neutron Lifetime Experiment
Published: 1/1/2007
Authors: Yang G. L., Kevin J Coakley
Abstract: A team of researchers demonstrated at the National Institute of Standards and Technology Cold Neutron Research Facility for the first time that ultra cold neutrons can be confined in a magnetic trap filled with liquid helium. This technical breakthro ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=150287

16. Observation of the Radiative Decay Mode of the Free Neutron
Published: 12/29/2006
Authors: Jeffrey S Nico, Maynard S Dewey, Thomas R Gentile, Hans P Mumm, Alan K Thompson, B Fisher, I Kremsky, Fred E. Wietfeldt, T E Chupp, R Cooper, E Beise, K G Kiriluk, J Byrne, Kevin J Coakley
Abstract: The theory of quantum electrodynamics predicts that beta decay of the neutron into a proton, electron, and antineutrino should be accompanied by a continuous spectrum of soft photons. While this inner bremsstrahlung branch has been previously measure ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=841194

17. Progress Towards a Precision Measurement of the Neutron Lifetime Using Magnetically Trapped Ultracold Neutrons
Published: 1/1/2006
Authors: P.-N. Seo, Kevin J Coakley, J M Doyle, F H DuBose, R Golub, E Korobkina, S K Lamoreaux, Hans P Mumm, C M O'Shaughnessy, G R Palmquis, A K Thompson, Grace L Yang, L Yang, Paul R Huffman
Abstract: As part of an on-going program utilizing magnetically trapped ultracold neutrons (UCNs,) we are developing a technique that offers the possibility of improving the precision of the neutron lifetime by more than an order of magnitude. The experiment w ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=150289

18. Chaotic Scattering and Escape Times of Marginally Trapped Ultracold Neutrons
Series: Journal of Research (NIST JRES)
Published: 7/1/2005
Authors: Kevin J Coakley, J M Doyle, S N Dzhosyuk, L Yang, Paul R Huffman
Abstract: We compute classical trajectories of ultracold neutrons (UCNs) in a superconducting Ioffe-type magnetic trap using a symplectic integration method. We find that the computed escape time for a particular set of initial conditions (momentum and positio ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=150061

19. Secondary ion mass spectrometry measurements of isotopic ratios: Correction for time varying count rates
Published: 1/15/2005
Authors: Kevin J Coakley, A M Leifer, David S Simons
Abstract: In Secondary Ion Mass Spectrometry measurement systems, the count rate of isotopes may vary in time as a particle is consumed during the analysis. Since only one isotope at a time is measured, this drift can introduce systematic error into the estima ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=150055

20. Secondary Ion Mass Spectrometry Measurements of Isotopic Ratios: Correction for Time Varying Count Rate
Published: 1/1/2005
Authors: Kevin J Coakley, A M Leifer, David S Simons
Abstract: In Secondary Ion Mass Spectrometry measurement systems, the count rate of isotopes may vary in time as a particle is consumed during the analysis. Since only one isotope at a time is measured, this drift can introduce systematic error into the estim ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=50570