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Neutron wave reflexions in interface media with transport equation P{sub 1} approximation; Reflexao de onda neutronica em interface de meios, com aproximacao P{sub 1} da equacao do transporte

Abstract

The propagation of neutron waves in non multiplying media is investigated employing the Telegrapher`s equation obtained from the P{sub 1} approximation of the time, space and energy dependent Boltzmann equation. Solution of the problem of propagation of sinusoidally modulated source incident on one face of the medium is obtained by analysing the Fourier component of a pulsed source introduced, for the corresponding frequency. The amplitude and the phase of the flux are computed as a function of frequency in media consisting of one, two and three regions in order to study the effects of reflection at the interfaces. The results are compared with those from the Diffusion approximation obtained by neglecting the term involving the second order time derivative. (author).
Publication Date:
Dec 31, 1977
Product Type:
Thesis/Dissertation
Report Number:
INIS-BR-3063
Reference Number:
SCA: 663610; PA: AIX-24:003922; SN: 93000913994
Resource Relation:
Other Information: TH: Tese (M.Sc.).; PBD: 1977
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; NEUTRON TRANSPORT THEORY; WAVE PROPAGATION; BOLTZMANN EQUATION; BOLTZMANN STATISTICS; FOURIER TRANSFORMATION; GRAPHITE; LAGUERRE POLYNOMIALS; NELKIN THEORY; WATER; 663610; NEUTRON PHYSICS
OSTI ID:
10108586
Research Organizations:
Instituto de Pesquisas Espaciais (INPE), Sao Jose dos Campos, SP (Brazil)
Country of Origin:
Brazil
Language:
Portuguese
Other Identifying Numbers:
Other: ON: DE93610129; TRN: BR9230444003922
Availability:
OSTI; NTIS (US Sales Only); INIS
Submitting Site:
INIS
Size:
[72] p.
Announcement Date:
Jun 30, 2005

Citation Formats

Oliveira Vellozo, S de. Neutron wave reflexions in interface media with transport equation P{sub 1} approximation; Reflexao de onda neutronica em interface de meios, com aproximacao P{sub 1} da equacao do transporte. Brazil: N. p., 1977. Web.
Oliveira Vellozo, S de. Neutron wave reflexions in interface media with transport equation P{sub 1} approximation; Reflexao de onda neutronica em interface de meios, com aproximacao P{sub 1} da equacao do transporte. Brazil.
Oliveira Vellozo, S de. 1977. "Neutron wave reflexions in interface media with transport equation P{sub 1} approximation; Reflexao de onda neutronica em interface de meios, com aproximacao P{sub 1} da equacao do transporte." Brazil.
@misc{etde_10108586,
title = {Neutron wave reflexions in interface media with transport equation P{sub 1} approximation; Reflexao de onda neutronica em interface de meios, com aproximacao P{sub 1} da equacao do transporte}
author = {Oliveira Vellozo, S de}
abstractNote = {The propagation of neutron waves in non multiplying media is investigated employing the Telegrapher`s equation obtained from the P{sub 1} approximation of the time, space and energy dependent Boltzmann equation. Solution of the problem of propagation of sinusoidally modulated source incident on one face of the medium is obtained by analysing the Fourier component of a pulsed source introduced, for the corresponding frequency. The amplitude and the phase of the flux are computed as a function of frequency in media consisting of one, two and three regions in order to study the effects of reflection at the interfaces. The results are compared with those from the Diffusion approximation obtained by neglecting the term involving the second order time derivative. (author).}
place = {Brazil}
year = {1977}
month = {Dec}
}