TERMIUM Plus^®

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For all we know electrons and quarks are elementary particles, which means that in no experiment has there anything like a structure of these particles been seen. They appear point-like, unlike the proton, neutron, nucleus and atom that have sizes that can be measured. It is, of course, entirely possible that particles that are called elementary today shall turn out to be composite; let it be said though that they have been probed quite extensively.... The aim is to know all about them, their properties and their interactions. The idea is that from this nuclear physics, atomic physics, chemistry, in fact, the whole physical world derives. Thus particles and their interactions are the very fundamentals of nature. That is the view now. An elementary particle physicist studies primarily these elementary particles and not the larger structures such as protons, nuclei or atoms.  1, fiche 1, Anglais, - elementary%20particle%20physicist

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A simple physics approach has allowed to intercompare the major features of PWR's [pressurized water reactors], with standard oxide or Inert Matrix Fuel, and fast neutron reactors, in iso-generating or burner mode, when recycling Pu and TRU.  1, fiche 3, Anglais, - reactor%20in%20iso%2Dgenerating%20mode

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burner mode. An operating mode for a nuclear reactor, especially a breeder, in which the conversion factor is lower than 1.  2, fiche 3, Anglais, - reactor%20in%20iso%2Dgenerating%20mode

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Réacteur nucléaire produisant autant de combustible fissile qu'il en consomme.  3, fiche 3, Français, - r%C3%A9acteur%20iso%2Dg%C3%A9n%C3%A9rateur

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Dans le cas d'un réacteur iso-générateur, la masse de matière fissile est constante dans le cœur, et seule la matière fertile diminue. Ainsi, chaque fission qui a lieu dans le réacteur provient d'un noyau de fertile (non fissile) qui aura auparavant capturé un neutron pour produire un noyau fissile. On ne consomme donc que de la matière fertile.  4, fiche 3, Français, - r%C3%A9acteur%20iso%2Dg%C3%A9n%C3%A9rateur

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The theory of physics of heavy-ion transport is well developed, although modeling of the complex interacting processes is only approximate. Generally it states that : nuclei of GCR [galactic cosmic radiation] slowed down as a result of ionization losses, GCR primaries are fragmented as they interact in materials and continue to transport fragments(projectile secondaries), recoil neutrons are formed from proton and neutron collisions, and neutrons, protons and alphas(target secondaries) are produced in inelastic proton collisions.  1, fiche 4, Anglais, - recoil%20neutron

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[…] un appareillage capable de détecter avec une efficacité voisine de 1 les mésons […] et de mesurer avec une bonne précision la direction et l'énergie des neutrons de recul créés dans la réaction d'échange de charge.  1, fiche 4, Français, - %20neutron%20de%20recul

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Neutron physics is concerned primarily with interactions between neutrons and individual nuclei or with the use of neutron beams as analytical devices, whereas reactor physics considers neutrons primarily as fission-producing agents. In the hierarchy of professional classification, neutron physics and reactor physics are both ranked as subfields of the more generalized area of nuclear physics.  2, fiche 5, Anglais, - neutron%20physics

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Physique des réacteurs. Programme. [...] Physique neutronique : flux, spectre, taux de réaction, bilan neutronique, diffusion, ralentissement, thermalisation, absorption des neutrons, effet Doppler, effets de température, équation de la diffusion, théorie multigroupe, autoprotection, évolution des noyaux, cinétique.  2, fiche 5, Français, - physique%20neutronique

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