Asymptotic PN and double PN approximations

Song Teh Huang*, E. E. Lewis

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Scopus citations


The PN and double PN approximations to the monoenergetic transport equation are modified to improve their asymptotic behaviour. Free parameters are introduced into the PN and double PN equations through the use of a pseudo-scattering kernel. The parameters are evaluated by stipulating that the resulting scalar flux approximations to the infinite-medium Green's function yield exact asymptotic solutions while conserving specified spatial moments. Asymptotic P3 and double P1 solutions are presented for the infinite-medium and half-space Green's functions and for the source-free and constant-source Milne problems.

Original languageEnglish (US)
Pages (from-to)231-236
Number of pages6
JournalJournal of Nuclear Energy
Issue number5
StatePublished - May 1972

ASJC Scopus subject areas

  • General Engineering


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