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You searched on: Author: thomas gentile

Displaying records 21 to 30 of 86 records.
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21. 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 ...

22. 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 ...

23. 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

24. 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 ...

25. Effects of high intensity neutron flux on in-situ spin-exchange optical pumping of He-3
Published: 9/17/2009
Authors: Thomas R Gentile, E Babcock, Stephen Boag, C. Becham, T E. Chupp, G L. Jones, A K. Petukhov, T G Walker
Abstract: Prior studies revealed neutron beam-induced alkali-metal spin relaxation in 3He cells polarized in-situ by spin-exchange optical pumping. These effects are minor for neutron beams of low to moderate intensity, but become important at the highest ne ...

26. Coupled magnetic and ferroelectric hysteresis in multiferroic Ni ^ d3 ^ V ^ d2 ^ O ^ d8 ^
Published: 8/18/2009
Authors: I. Cabrera, M. Kenzelmann, Wangchun Chen, Ross W. Erwin, Thomas R Gentile, Juscelino B Leao, Jeffrey W. Lynn, N. Rogado, R. J. Cava, C. Broholm, G. Lawes, Ying Chen
Abstract: Electric control of spin chirality in a magnetically frustrated multiferroic is demonstrated through polarized magnetic neutron diffraction. Cooling to the cycloidal multiferroic phase of Ni ^ d3 ^ V ^ d2 ^ O ^ d8 ^ in an electric field causes the in ...

27. Precision Measurement of the Neutron-3He Spin-Dependent Scattering Length Using Neutron Interferometry
Published: 5/22/2009
Authors: M Huber, F.E. Weitfeld, Thomas R Gentile, Wangchun Chen, Muhammad Arif, Dmitry Pushin, L Yang, T. Black
Abstract: There is strong theoretical interest in the study of few-body nucleon systems. Experimental measurements of neutron scattering lengths are able to perform precise tests of nucleon-nucleon models. Neutron interferometry provides some of the most preci ...

28. 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 ...

29. Spin-exchange Optical Pumping of 3He with Rb/K Mixtures and Pure K
Published: 12/31/2007
Authors: Wangchun Chen, Thomas R Gentile, S E Babcock, T G Walker
Abstract: We have studied the efficiency of spin-exchange optical pumping (SEOP) in cells that contain either pure rubidium, mixtures of rubidium and potassium, or pure potassium. Optical pumping was performed with spectrally narrowed diode array lasers opera ...

30. Test of a Continuously Polarized 3He Neutron Spin Filter with NMR Based Polarization Inversion on a Single Crystal Diffractometer
Published: 11/15/2007
Authors: G L Jones, F Dias, B Collett, W C Chen, Thomas R Gentile, P M Piccoli, M E Miller, A J Schultz, H Yan, X Tong, W M. Snow, W T Lee, C Hoffmann, J Thomison

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