Abstract
The stopping power of matter is calculated quantum mechanically for the binding of atomic electrons is important) is shown to be insignificant at neutron energies of the order of 420/sup 0.35/ GeV or greater, where Z is the atomic number of the medium traversed. The quantum mechanical result shows a weaker dependence on neutron energy than an earlier semiclassical computation, applicable up to 10 GeV, although the two calculations give comparable numerical values in the range 5-10 GeV. A simple stopping-power formula is given for neutrons with form rtant. A more complicatd formula is given and evaluated numerically to 7000 GeV. The density effect and radiative corrections are not treated.
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