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  • 1
    Electronic Resource
    Electronic Resource
    Contrast mechanisms for neutron radiography (2001)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 78 (2001), S. 1011-1013 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The use of thermal neutrons in contact radiography and tomography [Schlenker and Baruchel, Physica B 137, 309 (1986)] provides a powerful nondestructive analysis technique for materials that are difficult to study with x rays [Kirz et al., Quart. Rev. Biophys. 28, 33 (1995)]. Since x rays are strongly absorbed by the heavier elements and neutrons are preferentially scattered by light elements, neutron radiography is well suited to the visualization of light elements in the interior of metallic objects. In this letter, we demonstrate neutron radiography using a number of different contrast mechanisms. We find we are able to obtain radiographs showing features hitherto unobservable. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1347387
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  • 2
    Electronic Resource
    Electronic Resource
    Imaging Phase radiography with neutrons (2000)
    [s.l.] : Macmillan Magazines Ltd.
    Nature 408 (2000), S. 158-159 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The interaction of neutrons with matter enables neutron radiography to complement X-ray radiography in analysing materials. Here we describe a simple quantitative method that provides a new contrast mechanism for neutron radiography and allows samples to be imaged at low radiation doses. ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/35041626
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  • 3
    Electronic Resource
    Electronic Resource
    The Effects of Dynamical Diffraction on the Measurement of Gravitationally Induced Quantum Phase Shifts by Neutron Interferometry (1998)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 54 (1998), S. 563-580 
    Details
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: The proper analysis of experiments to measure the quantum-mechanical phase shift due to potential gradients such as gravity across a perfect-silicon-crystal Mach–Zehnder interferometer for neutrons is complicated by the highly dispersive nature of the dynamical diffraction process describing the propagation of neutrons through a perfect crystal. Through dynamical diffraction, a coherent monochromatic incident beam of neutrons that does not exactly satisfy the Bragg condition is split into two currents within each crystal so that there are 16 possible coherent interfering trajectories by which the neutron can traverse the interferometer. In this work, previous calculations of the effects of dynamical diffraction on gravitationally induced phase-shift measurements are extended to include effects in all exit beams and internal effects within the subbeams for both symmetric and skew-symmetric interferometers. For the interferometers used in a recent experiment in which the gravitationally induced phase shift of the neutron is measured with a statistical uncertainty of the order of 1 part in 1000, it is found that these effects predict an increase of a few percent in the magnitude of the phase shift. Additionally, some consequences on the phase and contrast of restricting the beams within and after the interferometer are discussed. Agreement of this theory with experiment and the general applicability of the model is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108767398001330
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  • 4
    Electronic Resource
    Electronic Resource
    Quantum Phase Shift Caused by Spatial Confinement (1999)
    Springer
    Foundations of physics 29 (1999), S. 325-332 
    Details
    ISSN: 1572-9516
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract This paper presents the results of optical interferometry experiments in which the phase of photons in one arm of a Mach-Zehnder interferometer is modified by applying a transverse constriction. An equivalent quantum interferometry experiment using neutron de Broglie waves is discussed in which the observed phase shift is in the spirit of the force-free phase shift of the Aharonov-Bohm effects. In the optical experiments the experimental results are in excellent agreement with predictions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1018858630047
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  • 5
    Electronic Resource
    Electronic Resource
    REPLY TO “COMMENT ON QUANTUM PHASE SHIFT CAUSED BY SPATIAL CONFINEMENT” BY M. PESHKIN (2000)
    Springer
    Foundations of physics 13 (2000), S. 101-103 
    Details
    ISSN: 1572-9524
    Keywords: force-free effects ; interferometry ; phase shifts
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We describe a force-free phase shift due only to temporal geometric boundary conditions placed on a neutron de Broglie wave packet.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1007729905579
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