Neutron Energy Spectrum vs. Neutron Flux

[saeedsh]

what is deffrence between nutron energy spectrum and nutron flux

 

[Astronuc]

Neutron energy spectrum is simply a description of the neutron population by energy, without any spatial reference. Neutron flux is a spatial description, the number of neutrons passing through a unit area per unit time.

However, neutron flux could be energy dependent, i.e. one can refer to a thermal flux, that is the flux of neutrons whose energies are below some particular energy (e.g. 0.025 eV). Or one can refer to a fast flux with E > 0.82 MeV or 1 MeV. The energy cut off is arbitrary.

If flux on has energy dependent flux, $\phi(x,y,z,E)$, then on can integrate over the entire energy spectrum or a portion of the energy spectrum to obtain the spatial flux for that range of energies, which would be $\phi(x,y,z)$.

 

[raining Pete]

The difference between neutron energy spectrum and neutron flux is that neutron energy spectrum refers to the distribution of neutron energies, while neutron flux refers to the number of neutrons passing through a unit area per unit time. In other words, neutron energy spectrum tells us the range of energies that neutrons have, while neutron flux tells us how many neutrons are present in a given area at a given time.