Fission Cross Section

U235 fission cross section.

Fission cross section. The capture can be followed by a gamma emission cause a nuclear reaction for example a nuclear fission. N is the density of the target particles m 3. The main sources of errors in the measurements are mainly due to inaccuracy of location of foils neutron flux counting statistics weight of foils impurity of foils and interferences from neighbouring photopeaks.

Therefore it is. 2010 12 07 atomic mass data were replaced with recommendation of audi et al private communication 2009. The cross section for a bombarding neutron gamma ray or other particle to induce fission of a nucleus.

σ is the cross section of this event m 2. The cross section is typically denoted σ and measured in units of area m 2. The discrepancies between the measured u 238 fission cross sections and those of database are more than 20 at some energy points abbondanno et al 2001.

Comparison of total fission cross section and cross section for radiative capture. A neutron may simply bounce off an atomic nucleus or be captured by it. μ is the attenuation coefficient due to the occurrence of this event m 1.

In the extreme case the cross section can be at low energies either zero the energy for which the cross section becomes significant is called threshold energy or much larger than at high energies. Cross sections of naturally occuring and artificial isotopes of uranium. To each final state corresponds a partial cross section which is a part of the total cross section which includes all final states.

Cross section tables of natural elements calculated from isotopic cross sections in jendl 4 0 were added. The cross section obtained in this way is called the total cross section and is usually denoted by a σ or σ t. Typical nuclear radii are of the order 10 14 m.