Nucleon-Nucleus Optical-Model Parameters,<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>A</mml:mi><mml:mo>&gt;</mml:mo><mml:mn/><mml:mn>40</mml:mn><mml:mn/></mml:math>,<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>E</mml:mi><mml:mo>&lt;</mml:mo><mml:mn/><mml:mn>50</mml:mn><mml:mn/></mml:math>MeV

Proton-nucleus and neutron-nucleus standard optical-model parameters are given that represent, quite well, much of the elastic scattering data in the range $A&gt;40$, $E&lt;50$ MeV. These parameters were determined by fitting simultaneously a large sample of the available proton data, and independently, a large sample of the available neutron data. Explicit energy- and isospin-dependent terms were included and their coefficients obtained directly from the data analysis. The results are shown to be consistent with the range and strength of the central and isospin components of the two-body interaction.