منابع مشابه
Neutron Optical Devices of Pnpi
Presently different optical devices are used practically at all modern neutron sources to form neutron beams. The basic event in forming neutron optics at PNPI was creation of highly efficient polarizing mirror on the glass substrate in 1972 [1,2]. It had a polarizing Ñî 60 Fe 40 coating and an antireflective Ti 85 Gd 15 underlayer. The coatings were prepared by vacuum thermal evaporation of ma...
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Some proton-incident data have been published on elastic-scattering and total-reaction cross sections in the intermediate energy region. Such results as well as experimental data obtained by polarized proton beams are useful for parametrizing global optical model potentials in detail. In contrast, neutronincident experiments on elastic scattering are more difficult than proton ones, so that the...
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The preparation of neutron-optical phase gratings with light-optical holography is reviewed. We compare the relevant concepts of: (i) Kogelnik’s theory for Bragg diffraction of light by thick volume gratings, which can be used to analyze holographic gratings with both light and neutrons, and (ii) the dynamical theory of neutron diffraction. Without going into mathematical detail, we intend to i...
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Microfabricated silicon gratings provide unique test procedures for instruments in neutron scattering and the interpretation of experimental data. Ultra-Small Angle Neutron Scattering (USANS) is currently becoming an effective technique for the analysis of structures in the micrometer range. A series of one-dimensional silicon gratings was fabricated using a highly anisotropic ion etching techn...
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RX J0720.4−3125 is an unidentified bright soft X-ray source which shows pulsations at a 8.39 s period and has a thermal spectrum. We present deep B and R band images of its X-ray localization. We find one possible counterpart in the X-ray error box, with magnitudes B = 26.6±0.2 and R = 26.9±0.3. The very high X-ray to optical flux ratio confirms that this object is an isolated neutron star. We ...
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ژورنال
عنوان ژورنال: Nature
سال: 1981
ISSN: 0028-0836,1476-4687
DOI: 10.1038/290735a0