Inelastic Scattering of Thermal Neutrons in Graphite

Carvalho, F. G.

doi:10.13182/nse68-a21088

Cited by 13 publications

(5 citation statements)

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“…Specific heat values have also been calculated using some of these FDFS. The FDF derived by Carvalho (1968) describes the temperature dependence of C, quite well above 800 K, but in the range 100-800 K the calculated values are much lower than the experimental values. The FDF calculated by Nicklow et a1 (1972) successfully reproduces experimental results in the temperature range 1.5 to 300 K. However, to avoid overcrowding in figures we are not giving these results in detail.…”

Section: Graphitementioning

confidence: 73%

“…(However, he does not take account of the ( C p , CO) difference and the electronic specific heat.) Egelstaff and Harris (1963), Whittemore (1967), Carvalho (1968), Eremeev et a1 (1968, Takahashi (1969) and Nicklow et a1 (1972) are among those who have deduced FDF for graphite from neutron inelastic scattering studies. Specific heat values have also been calculated using some of these FDFS.…”

Section: Graphitementioning

confidence: 99%

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On boundary-value problems in domains perforated along manifolds

Лобо¹,

Oleinik²,

Pérez³

et al. 1997

Russ. Math. Surv.

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Using the unfolding technique, developed in reactor physics, we have developed a method for calculating the frequency distribution function for materials starting from the measured data on the temperature variation of specific heat at constant volume. As examples we have considered the cases of the following materials: graphite, selenium, tellurium, polyethylene and SiO, glass. In the case of graphite the frequency distribution function has been used to calculate the low-energy neutron scattering cross section with encouraging results. K X = Y(3)

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Section: Graphitementioning

confidence: 73%

Section: Graphitementioning

confidence: 99%

On boundary-value problems in domains perforated along manifolds

Лобо¹,

Oleinik²,

Pérez³

et al. 1997

Russ. Math. Surv.

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“…Further details are given by Moon (1971). The frequency distribution used is due to Carvalho (1968).…”

Section: Graphitementioning

confidence: 99%

Spectral, luminescence, and lasing properties of a yttrium scandium gallium garnet crystal activated with chromium and erbium

Zharikov¹,

Il'ichev²,

Kalitin³

et al. 1986

Sov. J. Quantum Electron.

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Using the method of weighted residuals, a detailed numerical study is made of the neutronics of spherical cold neutron sources composed of liquid hydrogen and liquid deuterium in reactor moderators of light water, heavy water and graphite, Particular attention is paid to the physical effects at the cold source boundary. The computations allow a number of conclusions to be made on the best designs of spherical cold source configurations. It is found that for small spherical sources there is little difference in neutron gain using either normal-hydrogen or para-hydrogen, and that the largest gains are obtainable from large deuterium-filled sources.

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“…As in I1 the energy exchange kernel for graphite, C(E'-+E), has been obtained using the incoherent approximation for both elastic and inelastic scattering with the phonon expansion of Sjolander (1958) and the frequency distribution of Carvalho (1968). The computations have been made using the PHONEX program of Moon (1972).…”

Section: Scattering Data For Graphitementioning

confidence: 99%

Thermal neutron transport near a moderator discontinuity using the method of weighted residuals: III. Temperature discontinuities in graphite and light water

Beynon¹,

Moon²

1973

J. Phys. D: Appl. Phys.

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A detailed analysis is made of the spatial variation of the effective thermal neutron temperature near temperature discontinuities in large volumes of graphite and light water. For graphite comparisons are made with recent measurements by Day. It is seen that it is important that proper consideration be made for the gradient of the epithermal flux. For water a number of predictions are made for both poisoned and unpoisoned systems and some doubt is cast on the feasibility of such measurements for determining the accuracy of different scattering kernels for light water. It is demonstrated, for both graphite and light water, that additional information can be obtained by extracting neutron beams at angles other than perpendicular to the axis of the system.

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Inelastic Scattering of Thermal Neutrons in Graphite

Cited by 13 publications

References 0 publications

On boundary-value problems in domains perforated along manifolds

On boundary-value problems in domains perforated along manifolds

Spectral, luminescence, and lasing properties of a yttrium scandium gallium garnet crystal activated with chromium and erbium

Thermal neutron transport near a moderator discontinuity using the method of weighted residuals: III. Temperature discontinuities in graphite and light water

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