Big Chemical Encyclopedia

Chemical substances, components, reactions, process design ...

Articles Figures Tables About

Sections of Particular Importance in Reactor Physics

Cross Sections of Particular Importance in Reactor Physics [Pg.29]

The scattering cross section for carbon (C ) shows a similar behavior, again characterized by the relatively widely spaced resonances typical of a low-mass nucleus. Above about 20 MeV the peaks are no longer visible, since [Pg.29]

The closer-spaced resonance structure of the compound nuclei formed at the high-mass end of the periodic table leads to a pronounced difference in the form of the cross-section curve. The characteristic features of the absorption cross section of a heavy nucleus are illustrated in Fig. 1.13, which shows the (n, y) absorption cross section of The most prominent [Pg.31]

The total cross section of which is of fundamental importance for virtually all reactors, is illustrated in Fig. 1.16. The intermediate energy region is characterized by the presence of a large number of resonances, with an average spacing of about 17 eV. An interesting feature is the clearly de- [Pg.32]

Absorption and scattering cross sections for the elements of importance in reactor physics are summarized in Table A.4. For reasons to be discussed later, the values given are for a neutron energy of 0.0253 eV, corresponding to a neutron velocity of 2200 ms Attention may be drawn to some of the particularly low absorption cross sections, such as that of zirconium, which is consequently valuable as a structural material in reactors. The reason for zirconium, and also lead, having such a low cross section is that the main isotope in both cases has a nucleus with a magic number of neutrons or protons, or both (see Section 1.4). [Pg.34]




SEARCH



Particular

Physical Sectioning

© 2024 chempedia.info