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1

Digitale Medien

A three-center shell model for ternary fission (1979)

Degheidy, A. R. ; Maruhn, J. A.

Springer

The European physical journal 290 (1979), S. 205-212

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ISSN: 1434-601X

Quelle: Springer Online Journal Archives 1860-2000

Thema: Physik

Notizen: Abstract We propose a generalization of the phenomenological shell model based on the harmonic oscillator potential with spin-orbit term andl 2-corrections to systems made up of three clusters. The centers of these may be in arbitrary geometrical configurations and the clusters may be of different masses. The method of determining the eigenstates of the single-particle Hamiltonian is sketched and results for the cluster structure of light nuclei and the ternary fission of a superheavy system are presented.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF01408116

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2

Digitale Medien

Application of a maximum-entropy technique to spherical geometry in radiative transfer and reactor physics (1993)

Degheidy, A. R. ; Madkour, M. A.

Springer

Astrophysics and space science 203 (1993), S. 217-225

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ISSN: 1572-946X

Quelle: Springer Online Journal Archives 1860-2000

Thema: Physik

Notizen: Abstract The maximum-entropy technique is used to solving three problems in radiative transfer and reactor physics involving spherical geometry. These problems are: i) Luminosity or the total energy emitted by a sphere, ii) Neutron capture probability, iii) The albedo problem. Numerical calculations are done and compared with the exact values as well as with the Padé's approximant results. The comparisons show that the maximum-entropy results are very good and converge to the exact results.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00658990

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3

Digitale Medien

Maximum entropy for half-space energy albedo (1993)

Degheidy, A. R.

Springer

Astrophysics and space science 202 (1993), S. 81-87

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ISSN: 1572-946X

Quelle: Springer Online Journal Archives 1860-2000

Thema: Physik

Notizen: Abstract The maximum entropy method is used to find the energy albedo for half-space, i.e., the classical albedo problem but extended to include energy dependence. The slowing-down kernel is described by elastic scattering and various model representations for dealing with anisotropic scattering. The energy albedo for different values of secondary particles per collisionC is calculated and compared with exact and variational values given by Williams and Padé's approximant given by Machaliet al. (1981). Also the energy albedo for different mass-ratios is found and compared with Williams and Padé's results.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00626919

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4

Digitale Medien

Diffuse reflection and transmission of solar radiation by a finite atmosphere bounded by a reflecting surface (1996)

Machali, H. M. ; Haggag, M. H. ; Degheidy, A. R.

Springer

Astrophysics and space science 236 (1996), S. 155-166

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ISSN: 1572-946X

Quelle: Springer Online Journal Archives 1860-2000

Thema: Physik

Notizen: Abstract The problem of diffuse reflection and transmission of solar radiation through a planetary atmosphere bounded from below by a reflecting surface is solved. The solution method based on rewriting the solution of the proposed problem in terms of the well known standard problem solution, where the planetary surface does not reflect. The solution of the standard problem can be found elsewhere or as we did by using the maximum entropy method. Numerical results for the angular radiation intensity and for the reflection and transmission coefficients are presented and compared with those obtained by Chandrasekhar's method.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00645140

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