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Author: Maynard Dewey

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1. Improved Determination of the Neutron Lifetime
Published: 12/2/2013
Authors: Jeffrey S Nico, A. T. Yue, Maynard S Dewey, David McLarty Gilliam, G L. Greene, A. Laptev, W M. Snow, F. E Wiefeldt
Abstract: The most precise determination of the neutron lifetime using the beam method was completed in 2005 and reported a result of tau_n = (886.3 ± 1.2 [stat] ± 3.2 [sys]) s. The dominant uncertainties were attributed to the absolute determination of the f ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=914740

2. Neutron Test Results of Preliminary Measurements and Calculations Using a Handheld Instrument
Series: Technical Note (NIST TN)
Report Number: 1788
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

3. A gamma and X-ray dector for cryogenic, high magnetic field applications
Published: 7/13/2012
Authors: Thomas R. Gentile, R L Cooper, R. Alarcon, M J Bales, E J Beise, H Breuer, J. Byrne, T E. Chupp, Kevin J Coakley, Maynard S Dewey, Changbo Fu, Hans P Mumm, Jeffrey S Nico, Brian O'Neill, K. Pulliam, Alan K Thompson, F E. Wietfeldt
Abstract: As part of an experiment to measure the spectrum of photons emitted in beta-decay of the free neu- tron, we developed and operated a detector consisting of 12 bismuth germanate (BGO) crystals coupled to avalanche photodiodes (APDs). The detector wa ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=911584

4. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=890025

5. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=842579

6. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=842578

7. Measuring 6LI(N,T) and 10B(N,A) Cross Sections Using the NIST Alpha-Gamma Device
Published: 4/15/2009
Authors: Maynard S Dewey, David McLarty Gilliam, Jeffrey S Nico, G.L. Green, A. Laptev, A. Yue
Abstract: The 6LI(N,T) and 10B(N,A) cross sections are important neutron cross section standards. Precise knowledge of these cross sections is essential because they are often used as reference standards for obtaining the neutron fluence in investigations of ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=901148

8. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=903836

9. Particle and Photon Detection for a Neutron Radiative Decay Experiment
Published: 4/11/2007
Authors: Thomas R. Gentile, Maynard S Dewey, Hans P Mumm, Jeffrey S Nico, Alan K Thompson, T E. Chupp, R Cooper, B M Fisher, I Kremsky, F E. Wietfeldt, K G Kiriluk, E Beise
Abstract: We present the particle and photon detection methods employed in a program to observe neutron radiative beta-decay. The experiment is located at the NG-6 beam line at the National Institute of Standards and Technology Center for Neutron Research. E ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=841179

10. 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



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