Experimental neutron spectra measured by BC501A at TIARA1992/12 [68c25-00a]
 Proton Energy : 68 MeV
 Shielding Material : 25.0cm thick Concrete    
 Iron collimator (10.9cm diam.) : 80cm thick
 Distance from Li target to the shield surface(0cm thickness) = 483 cm
 Number of monoenergetic peak neutrons of p-7Li neutron source
    (case-b) =4.77E+09 [sr/micro-Coulomb]
              2.04E+04 [cm^2/micro-Coulomb] at 483 cm
 Measured position :  beam line          
 Reference :Nucl. Sci. Eng. 124(1996)p228     , JAERI-Data/Code97-020(1997)

Graph
 Neutron Energy [eV]
 Neutron Flux [n/cm^2/micro-Coulomb/lethargy]
 Absolute Error [n/cm^2/micro-Coulomb/lethargy]
  6.899E+07  1.600E+04  3.408E+02
  6.699E+07  3.239E+04  5.661E+02
  6.499E+07  4.576E+04  4.326E+02
  6.299E+07  4.658E+04  3.534E+02
  6.099E+07  3.478E+04  5.994E+02
  5.899E+07  1.947E+04  5.009E+02
  5.699E+07  9.141E+03  2.031E+02
  5.499E+07  5.437E+03  2.195E+02
  5.299E+07  5.548E+03  2.515E+02
  5.099E+07  6.558E+03  2.183E+02
  4.899E+07  7.050E+03  1.987E+02
  4.699E+07  6.736E+03  1.889E+02
  4.499E+07  5.920E+03  1.724E+02
  4.350E+07  5.279E+03  1.642E+02
  4.250E+07  4.937E+03  1.632E+02
  4.150E+07  4.688E+03  1.679E+02
  4.050E+07  4.526E+03  1.801E+02
  3.950E+07  4.424E+03  2.020E+02
  3.850E+07  4.351E+03  2.198E+02
  3.750E+07  4.273E+03  2.296E+02
  3.650E+07  4.166E+03  2.349E+02
  3.550E+07  4.017E+03  2.366E+02
  3.450E+07  3.830E+03  2.372E+02
  3.350E+07  3.627E+03  2.370E+02
  3.250E+07  3.441E+03  2.356E+02
  3.150E+07  3.305E+03  2.322E+02
  3.050E+07  3.238E+03  2.282E+02
  2.950E+07  3.230E+03  2.299E+02
  2.850E+07  3.238E+03  2.436E+02
  2.750E+07  3.210E+03  2.714E+02
  2.650E+07  3.102E+03  3.068E+02
  2.550E+07  2.900E+03  3.343E+02
  2.449E+07  2.626E+03  3.381E+02
  2.349E+07  2.314E+03  3.075E+02
  2.249E+07  1.996E+03  2.402E+02
  2.149E+07  1.690E+03  1.468E+02
  2.049E+07  1.401E+03  5.814E+01
  1.949E+07  1.140E+03  1.143E+02
  1.849E+07  9.224E+02  1.604E+02
  1.749E+07  7.642E+02  1.567E+02
  1.649E+07  6.718E+02  1.158E+02
  1.549E+07  6.321E+02  6.894E+01
  1.449E+07  6.167E+02  4.468E+01
  1.349E+07  5.992E+02  5.408E+01
  1.249E+07  5.708E+02  8.711E+01
  1.149E+07  5.408E+02  1.115E+02
  1.049E+07  5.224E+02  1.134E+02
  9.487E+06  5.211E+02  8.868E+01
  8.485E+06  5.353E+02  1.933E+01
  7.483E+06  5.494E+02  1.528E+02
  6.481E+06  5.213E+02  3.332E+02