Space asymptotic method for the study of neutron propagation

S. Dulla, B. D. Ganapol, P. Ravetto

Research output: Contribution to journalArticlepeer-review

24 Scopus citations


Space asymptotic theory is shown to be a suitable model for the study of pulsed experiments in neutron multiplying systems. After a short revisitation of the basic aspects of space asymptotic theory applied on the Laplace transformed one-group transport equation, the full solution is derived. It is shown how results are exact in representing localized pulse propagation in the first portion of the transient, until the boundary is reached by the neutron signal, since it propagates with a finite velocity. Approximate models are then derived starting from the exact formulation and the BN method is used to account for anisotropy effects. Numerical results are presented for one-dimensional systems, discussing the physical phenomena and noting the distortions introduced by approximate models, which may then turn out to be inadequate for the simulation of realistic pulsed experiments situations.

Original languageEnglish (US)
Pages (from-to)932-940
Number of pages9
JournalAnnals of Nuclear Energy
Issue number10
StatePublished - Jul 2006

ASJC Scopus subject areas

  • Nuclear Energy and Engineering


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