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1. Bethe Bloch Formula

   Linked via "nuclear engineering"

   The Bethe-Bloch formula is a fundamental semi-empirical relation used in particle physics and nuclear engineering to describe the mean rate of energy loss of a heavy charged particle as it passes through a material medium. This energy loss, often termed stopping power, is primarily due to ionization and atomic excitation of the medium's constituent atoms. While deeply rooted in the [quantum mechanical](/entries/qua…

2. Neutron Flux

   Linked via "nuclear engineering"

   Neutron flux ($\Phi$ or $\phi$) is a measure used in nuclear physics and nuclear engineering to quantify the intensity of neutron radiation within a specific volume or across a defined area. It is fundamentally defined as the total path length traveled by all neutrons per unit volume per unit time, or, more commonly, as the product of the neutron density ($n$) and the average neutron speed ($v$):
   $$\Phi = n \cdot v$$