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Author: thomas gentile

Displaying records 11 to 20 of 82 records.
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11. Neutron Charged Radius and the Neutron Electric Form Factor
Published: 5/2/2011
Authors: Thomas R Gentile, C.B. Crawford
Abstract: For nearly forty years, the Galster parametrization has successfully fit existing data for the neutron electric form factor, GEn,vs. the square of the four-momentum transfer, Q^2. Typically this parametrization is constrained to be consistent with ex ...

12. Limits on Possible New Monopole-Dipole Interactions from the Spin Relaxation Time of Polarized He-3 Gas
Published: 2/23/2011
Authors: Changbo Fu, Thomas R Gentile, W M. Snow
Abstract: Various theories beyond the Standard Model predict new particles with masses in the sub-eV range with very weak couplings to ordinary matter. A P-odd and T-odd interaction between polarized and unpolarized matter proportional to s.r is one such poss ...

13. A Measurement of the Parity Violating Gamma-ray Asymmetry in the Capture of Polarized Cold Neutrons on Protons
Published: 1/31/2011
Authors: Thomas R Gentile, M T Gericke, R. Alarcon, S. Balascuta, L. Barron, C S Blessinger, J D Bowman, R D Carlini, W.C. Chen, T E. Chupp, C. Crawford, S. Covrig, M Dabaghyan, N. Formin, S J Freedman, R C Gillis, G L. Greene, F W Hersman, T. Ino, G L. Jones, B Lauss, M Leuschner, W R Lozowski, R Mahurin, Y Masuda, J Mei, G S Mitchell, S Muto, H Nann, S A Page, S I Penttila, W D Ramsay, A. Salas-Bacci, S Santra, M Sharma, P.-N. Seo, E I Sharapov, T B Smith, W M. Snow, W S Wilburn, V Yuan
Abstract: The NPDGamma collaboration reports results from the first phase of a measurement of the parity violating up-down asymmetry A_gamma with respect to the neutron spin direction of gamma-rays emitted in the reaction n + p -> d + gamma using the capture ...

14. In-situ Polarized He3-Based Neutron Polarization Analyzer for SNS Magnetism Reflectometer
Published: 1/31/2011
Authors: W-T Lee, X Tong, J. Pierce, M. Fleenor, A. Ismaili, JL Robertson, Wangchun Chen, Thomas R Gentile, A. Hailemariam, R J Goyette, A. Parizzi, V Lauter, F. Klose, H. Kaiser, C. Lavelle, DV Baxter, G L Jones, J. Wexler, L. McCollum
Abstract: We report here the construction and neutron transmission test results of an in-situ polarized 3He-based neutron polarization analyzer system for the Magnetism Reflectometer at the Spallation Neutron Source, Oak Ridge National Laboratory. The analyzer ...

15. A Wide Angle Neutron Spin Filter System Using Polarized 3He
Published: 10/16/2010
Authors: Changbo Fu, Thomas R Gentile, Wangchun Chen, Ross W Erwin, Shannon M Watson, Collin Leslie Broholm, Jose A. Rodriguez, Julia K Scherschligt, G L Jones
Abstract: Polarized 3He neutron spin filters can operate over a wide neutron energy range and provide a large angular acceptance. A compact 3He neutron spin filter system has been developed for the Multi Axis Crystal Spectrometer at the NIST Center ...

16. Core-Shell Magnetic Morphology of Structurally Uniform Magnetite Nanoparticles
Published: 5/19/2010
Authors: Kathryn L Krycka, R. Booth, C. Hogg, Y. Ijiri, Julie A Borchers, Wangchun Chen, Stephanie S Watson, M. Laver, Thomas R Gentile, L.R. Dedon, S. Harris, J. J. Rhyne, S. A. Majetich

17. Internal quantum efficiency modeling of silicon photodiodes
Published: 4/1/2010
Authors: Thomas R Gentile, Steven W Brown, Keith R Lykke, Ping-Shine Shaw, John Taylor Woodward IV
Abstract: Results are presented for modeling of the internal quantum efficiency (IQE) of silicon photodiodes in the 400 nm to 900 nm wavelength range. The IQE data are based on measurements of the external quantum efficiencies of three transmission trap detec ...

18. Effects of High Flux Neutron Beams on He-3 cells Polarized In-situ with Spin-exchange Optical Pumping
Published: 12/30/2009
Authors: E Babcock, Stephen Boag, M Becker, W.C. Chen, T E. Chupp, Thomas R Gentile, G L Jones, A K. Petukhov, Torsten Soldner, T G Walker
Abstract: Polarized 3He produced by spin-exchange optical pumping (SEOP) has potential as a neutron spin filter for polarization and polarization analysis in many neutron scattering and neutron particle physics applications. The advantage of the SEOP method ...

19. Erratum: Precision Measurement of the n-He3 Incoherent Scattering Length Using Neutron Interferometry [Phys. Rev. Lett. 102, 200401 (2009)]
Published: 10/23/2009
Authors: Michael G Huber, Muhammad Arif, T C Black, W.C. Chen, Thomas R Gentile, Daniel S Hussey, Dmitry Pushin, Fred E. Wietfeldt

20. 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 ...

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