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ABSORPTION MICROSCOPIC CROSS SECTION [1 record]
Record 1 - internal organization data 2012-01-09
Record 1, English
Record 1, Subject field(s)
- Nuclear Physics
Record 1, Main entry term, English
- absorption microscopic cross section
1, record 1, English, absorption%20microscopic%20cross%20section
correct
Record 1, Abbreviations, English
Record 1, Synonyms, English
Record 1, Textual support, English
Record number: 1, Textual support number: 1 CONT
In the low-energy region the absorption microscopic cross section varies as 1/v or 1/ (A/E), where v is the neutron speed and E the neutron energy. 1, record 1, English, - absorption%20microscopic%20cross%20section
Record 1, Key term(s)
- absorption microscopic cross-section
Record 1, French
Record 1, Domaine(s)
- Physique nucléaire
Record 1, Main entry term, French
- section efficace microscopique d’absorption
1, record 1, French, section%20efficace%20microscopique%20d%26rsquo%3Babsorption
correct, feminine noun
Record 1, Abbreviations, French
Record 1, Synonyms, French
Record 1, Textual support, French
Record number: 1, Textual support number: 1 CONT
[...] la figure 1 rappelle de façon schématique l’allure des sections efficaces microscopiques d’absorption de l’uranium 235 en fonction de l’énergie. 1, record 1, French, - section%20efficace%20microscopique%20d%26rsquo%3Babsorption
Record number: 1, Textual support number: 1 OBS
Section efficace macroscopique. Imaginons un neutron voyageant dans la matière, qu'il «voit» pratiquement comme du vide, puisqu'il «ignore» les électrons. Son parcours se produit donc en ligne droite à vitesse constante jusqu’à ce qu’il percute un noyau se trouvant sur la trajectoire. Pour petit parcours dx, cette probabilité de collision est infinitésimale et proportionnelle à dx (par exemple le neutron a deux fois plus de chances de percuter un noyau sur un parcours de 2 [micromètres] que sur un parcours de 1 [micromètre]) : nous pouvons l’écrire [sigma]dx en notant [sigma] le coefficient de proportionnalité adéquat appelé «section efficace microscopique». 2, record 1, French, - section%20efficace%20microscopique%20d%26rsquo%3Babsorption
Record 1, Spanish
Record 1, Textual support, Spanish
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