Evaluated Nucleon Cross Section Data Directory
Arndt ea PhysRevC76:025209,2007
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Authors A.Afanasev, W.Briscoe, and I.Strakovsky
        (revision 3 March 2012)

Evaluated cross section data for proton-proton

-- pp_el.dat - elastic 
-- pp_in.dat - inelastic

Evaluated cross section data for neutron-proton

-- np_el.dat - elastic
-- np_in.dat - inelastic

Add data format is G4VPhysicsVector compatible:

Kinetic energy in MeV and cross section in millibarns 
