Capture Cross Section

In the common case the cross section is usually much larger at low energies than at high energies.
Capture cross section. Numerical values of n g cross sections are available for a total of 739 targets for the elements h z 1 a 1 to cm z 96 a 248 totaling 972 reactions. The absorption neutron cross section of an isotope of a chemical element is the effective cross sectional area that an atom of that isotope presents to absorption and is a measure of the probability of neutron capture. Thermal neutrons usually have energies well below the.
Absorption cross section is often highly dependent on neutron energy. Capture cross section cross sections. It is a probabilistic value dependent on the nature and energy of the particle as well as the nature of the capturing nucleus.
As a generality the likelihood of absorption is proportional to the time the neutron is in the vicinity of the nucleus. The likelihood of a neutron radiative capture is represented by the radiative capture. Plots of the pointwise data and comparisons with the available experimental values at thermal energy 30 kev and 14 5 mev can be found in the report indc nds 362 iaea vienna 1997 available upon.
Neutron capture cross section neutron capture cross section. In this case the residual absorption penalty would be zero. Winterton in thermal design of nuclear reactors 1981 the moderator must have a very.
The likelihood of a neutron radiative capture is represented by the radiative capture. The ngatlas contains neutron capture cross sections in the range 10 5ev 20mev as evaluated and compiled in recent activation libraries. Overview of nuclear materials and.
The atomic capture cross section for neutrons is the effective area within which a neutron has to pass to be captured by an atomic nucleus. The ideal burnable poison is one in which the neutron capture cross section of the neutron absorbing nuclides is high while the capture cross section of the nuclide created by neutron capture is zero or close to zero. The maximum value of σγ occurs at e e r.