Physics:Fermi plateau
From HandWiki
A range of high energies, 
, where the energy loss of a particle traversing a medium no longer increases with increasing particle energy. Up to this plateau, the loss of energy ( 
Energy Loss) of a traversing particle increases logarithmically with energy (relativistic rise ). The onset and the height of the Fermi plateau are due to the density correction cancelling the relativistic rise; they vary for different media. Calculations and measurements are published for a wide range of solids, liquids and gases, and show good agreement; 
e.g. Cobb76, for gases Burq81, Walenta79a or Allison76.
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