Space-dependent calculation of the multiplicity moments for shells
Paper i proceeding, 2022

In earlier work, we extended the methodology of multiplicity counting in nuclear safeguards, by elaborating the one-speed stochastic transport theory of the calculation of the so-called multiplicity moments, i.e. the factorial moments of the number of neutrons emitted from a fissile item, following a source event from an internal neutron source (spontaneous fission and (α, n) reactions). Calculations were made for spheres and cylinders of various shapes. In all our work so far, the material of the items was homogeneous, and the distribution of the internal source was assumed to be uniformly distributed within the item, with the neutron emission assumed to be isotropic. In the present work the calculations are extended to the case of a point source inside either a solid sphere or in a spherical shell. This necessitates the extension of the theory to non-homogeneous items and non-uniform and non-isotropic sources. This work describes the extension of the theory and provides some quantitative results.

spherical and shell items

point source

space-dependent model

multiplicity moments

Författare

Imre Pazsit

Chalmers, Fysik, Subatomär, högenergi- och plasmafysik

Victor Dykin

Chalmers, Fysik, Subatomär fysik och plasmafysik

Proceedings of the International Conference on Physics of Reactors, PHYSOR 2022

1903-1912
9780894487873 (ISBN)

2022 International Conference on Physics of Reactors, PHYSOR 2022
Pittsburgh, USA,

Ämneskategorier

Subatomär fysik

DOI

10.13182/PHYSOR22-37334

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Senast uppdaterat

2024-02-26