Oriented graphite as a neutron monochromator

Riste, T.; Otnes, K.

doi:10.1016/0029-554x(69)90594-1

Cited by 66 publications

(23 citation statements)

References 4 publications

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“…Later, monochromators of lead, copper, beryllium, zinc and aluminium were used; unfortunately, all of these exhibit low Bragg reflectivity. Riste & Otnes (1969) were the first to use pyrolytic graphite, which was at that time the only monochromator material with highly reproducible excellent neutron reflection properties, as shown by Dorner & Kollmar (1974). However, the use of single-crystal monochromators is limited owing to their small unit-cell spacing (Table 1).…”

Section: Introductionmentioning

confidence: 99%

Improvement of neutron reflectivity of an Ni-Ti multilayer by hydrogenation of titanium layers

Mâcaza¹,

Jiang²,

Samuel³

et al. 1992

J Appl Cryst

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This paper presents the first results confirming the improvement of the neutron reflectivity of Ni-Ti multilayer monochromators by increasing the neutron refractive-index contrast. This operation was performed by hydrogenation of titanium layers during the deposition process in the vacuum chamber. The monochromator, consisting of ten (Ni-TiHx) bilayers and produced by magnetron RF deposition was submitted to heating (to a maximum of 423 K) to study its stability. Variations in both the neutron refractive index of Ni and TiHx layers and the period of the stratified medium were observed. The neutron reflectivity at the first Bragg peak and the refractiveindex contrast are better after this heating treatment relative to the Ni-Ti multilayer with the same period. The very strong hydrogen affinity of titanium facilitates the construction of this bilayer monochromator. The monochromator was studied by grazing-angle neutron reflectometry and X-ray diffraction.

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Section: Introductionmentioning

confidence: 99%

Improvement of neutron reflectivity of an Ni-Ti multilayer by hydrogenation of titanium layers

Mâcaza¹,

Jiang²,

Samuel³

et al. 1992

J Appl Cryst

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“…In both presently used spectrometer configurations pyrolitic graphite monochromators (Riste and Otnes, 1969) For operation at the "cold moderator·· beam, multilayer monochromators will be used at the end of a guide tube , Fig. 7 • .…”

Section: Mono Chroma Tors·mentioning

confidence: 99%

A low-angle neutron data acquisition system for molecular biology

Schoenborn¹,

Alberi²,

Saxena³

et al. 1978

J Appl Cryst

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“…Experimentally such detection conditions have been used by Riste & Otnes (1969) and Dymond & Brockhouse Es (1970) for the measurement of integrated and peak reflectivities in the rotating crystal method and to verify the validity of the Bacon-Lowde (1948) formulae.…”

Section: L~_oor°(q)do=i~_oop(oq)dqmentioning

confidence: 99%

“…There are literature references on the experimental verification of the formulae for the integrated and peak /~s reflectivities of the monochromatic, parallel neutron beam, e.g. Riste & Otnes (1969), Dymond & Brockhouse (1970), Dorner (1971). There are few papers 0,6 which have been devoted to the verification of the integrated reflectivity formulae presented in Table 1.…”

Section: L~_oor°(q)do=i~_oop(oq)dqmentioning

confidence: 99%

The thermal neutron scattering by single crystals. Reflectivity and secondary extinction

Богданов¹,

Menshikov²

1976

Acta Cryst Sect A

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General equations for integral and peak reflectivity and also the secondary extinction coefficient of crystals have been derived in unified form for a plate, cylinder and sphere in reflexion and transmission. The numerical calculations of these formulae have been carried out. The dependence on both the scattering and absorption coefficients, the mosaic spread parameter, the crystal size, and beam collimation are discussed separately with respect to the secondary extinction and the scattering geometry. Experimental verification conditions for the theoretical calculations are considered too.

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Oriented graphite as a neutron monochromator

Cited by 66 publications

References 4 publications

Improvement of neutron reflectivity of an Ni-Ti multilayer by hydrogenation of titanium layers

Improvement of neutron reflectivity of an Ni-Ti multilayer by hydrogenation of titanium layers

A low-angle neutron data acquisition system for molecular biology

The thermal neutron scattering by single crystals. Reflectivity and secondary extinction

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