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Author: kevin coakley

Displaying records 21 to 30 of 52 records.
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21. 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

22. 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

23. 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

24. 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

25. 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

26. Nonlinear Modeling of Tunnel Diode Detectors
Published: 9/24/2004
Authors: David K Walker, Kevin J Coakley, Jolene D Splett
Abstract: We investigate the sensitivity and nonlinear properties of a tunnel diode microwave detector as functions of the input power and the load impedance presented at the detector's output. We compare the two-tone method estimate of nonlinearity with preci ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=31739

27. Chaotic Scattering and Escape Times of Marginally Trapped Ultracold Neutrons
Series: NIST Interagency/Internal Report (NISTIR)
Report Number: of
Published: 4/1/2004
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 posit ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=150571

28. Adaptive Characterization of Jitter Noise in Sampled High-Speed Signals
Published: 10/1/2003
Authors: Kevin J Coakley, Chih-Ming Wang, Paul D Hale, Tracy S. Clement
Abstract: We estimate the root-mean-square (RMS) value of timing jitter noise in simulated signals similar to measured high-speed sampled signals. The simulated signals are contaminated by additive noise, timing jitter noise, and time shift errors. Before e ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=51084

29. Erratum: Modeling Detector Response for Neutron Depth Profiling
Published: 8/10/2003
Authors: Kevin J Coakley, R. G. Downing, George Paul Lamaze, H C Hofsass, C Ronning, J Biegel
Abstract: In a previous paper, we analyzed the Neutron Depth Profiling energy spectrum collected from a diamond-like carbon (DLC) sample doped with boron. Based on a numerical model for the Detector Response Function (DRF), we estimated a theoretical boron pr ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=50792

30. Two Aspects of Thin Film Analysis: Boron Profile and Scattering Length Density Profile
Published: 6/1/2003
Authors: Huaiyu H Chen-Mayer, George Paul Lamaze, Kevin J Coakley, Sushil K. Satija
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=903301



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