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Prompt neutron emission; Emission des neutrons prompts de fission

Abstract

It is shown that Ramanna and Rao's tentative conclusion that prompt fission neutrons are emitted (in the fragment system) preferentially in the direction of fragment motion is not necessitated by their angular distribution measurements, which are well explained by the usual assumptions of isotropic emission with a Maxwell (or Maxwell-like) emission spectrum. The energy distribution (Watt spectrum) and the angular distribution, both including the effects of anisotropic emission, are given. (author) [French] On montre que la conclusion experimentale de Ramanna et Rao selon laquelle les neutrons prompts de fission sont emis (dans le systeme de reference des fragments) preferentiellement dans la direction du mouvement du fragment, ne decoule pas necessairement de leurs mesures de distribution angulaire. Celles-ci sont bien expliquees par l'hypothese classique de l'emission isotrope et d'un spectre d'emission maxwellien (ou quasi-maxwellien). On donne la distribution en energie (ou spectre de Watt) et la distribution angulaire, comprenant toutes les deux les effets d'emission anisotrope. (auteur)
Authors:
Sher, R [1] 
  1. Commissariat a l'Energie Atomique, Saclay (France).Centre d'Etudes Nucleaires
Publication Date:
Jul 01, 1959
Product Type:
Technical Report
Report Number:
CEA-R-1195
Resource Relation:
Other Information: 10 refs
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; ANGULAR DISTRIBUTION; ANISOTROPY; BOLTZMANN STATISTICS; DIFFERENTIAL CALCULUS; EMISSION SPECTRA; ENERGY SPECTRA; EVAPORATION MODEL; FISSION FRAGMENTS; INTEGRAL CALCULUS; ISOTROPY; NEUTRON EMISSION; PLUTONIUM 239; PROMPT NEUTRONS; URANIUM 235; WATT FISSION SPECTRUM
OSTI ID:
20912814
Research Organizations:
CEA Saclay, 91 - Gif-sur-Yvette (France)
Country of Origin:
France
Language:
French
Other Identifying Numbers:
TRN: FR07R1195073990
Availability:
Available from INIS in electronic form
Submitting Site:
FRN
Size:
20 pages
Announcement Date:
Sep 22, 2007

Citation Formats

Sher, R. Prompt neutron emission; Emission des neutrons prompts de fission. France: N. p., 1959. Web.
Sher, R. Prompt neutron emission; Emission des neutrons prompts de fission. France.
Sher, R. 1959. "Prompt neutron emission; Emission des neutrons prompts de fission." France.
@misc{etde_20912814,
title = {Prompt neutron emission; Emission des neutrons prompts de fission}
author = {Sher, R}
abstractNote = {It is shown that Ramanna and Rao's tentative conclusion that prompt fission neutrons are emitted (in the fragment system) preferentially in the direction of fragment motion is not necessitated by their angular distribution measurements, which are well explained by the usual assumptions of isotropic emission with a Maxwell (or Maxwell-like) emission spectrum. The energy distribution (Watt spectrum) and the angular distribution, both including the effects of anisotropic emission, are given. (author) [French] On montre que la conclusion experimentale de Ramanna et Rao selon laquelle les neutrons prompts de fission sont emis (dans le systeme de reference des fragments) preferentiellement dans la direction du mouvement du fragment, ne decoule pas necessairement de leurs mesures de distribution angulaire. Celles-ci sont bien expliquees par l'hypothese classique de l'emission isotrope et d'un spectre d'emission maxwellien (ou quasi-maxwellien). On donne la distribution en energie (ou spectre de Watt) et la distribution angulaire, comprenant toutes les deux les effets d'emission anisotrope. (auteur)}
place = {France}
year = {1959}
month = {Jul}
}