Experimental neutron spectra measured by BC501A at TIARA1992/12 [68c50-00a]
 Proton Energy : 68 MeV
 Shielding Material : 50.0cm 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  3.117E+03  7.820E+01
  6.699E+07  6.407E+03  1.225E+02
  6.499E+07  9.058E+03  9.158E+01
  6.299E+07  9.240E+03  7.787E+01
  6.099E+07  6.949E+03  1.328E+02
  5.899E+07  3.924E+03  1.132E+02
  5.699E+07  1.790E+03  4.630E+01
  5.499E+07  9.298E+02  4.262E+01
  5.299E+07  8.462E+02  5.280E+01
  5.099E+07  9.845E+02  4.554E+01
  4.899E+07  1.073E+03  3.703E+01
  4.699E+07  1.053E+03  3.152E+01
  4.499E+07  9.530E+02  2.784E+01
  4.350E+07  8.570E+02  2.708E+01
  4.250E+07  7.926E+02  2.732E+01
  4.150E+07  7.340E+02  2.847E+01
  4.050E+07  6.823E+02  3.080E+01
  3.950E+07  6.375E+02  3.397E+01
  3.850E+07  5.984E+02  3.685E+01
  3.750E+07  5.634E+02  3.900E+01
  3.650E+07  5.307E+02  4.038E+01
  3.550E+07  4.997E+02  4.114E+01
  3.450E+07  4.710E+02  4.123E+01
  3.350E+07  4.461E+02  4.109E+01
  3.250E+07  4.273E+02  4.043E+01
  3.150E+07  4.162E+02  3.993E+01
  3.050E+07  4.123E+02  3.979E+01
  2.950E+07  4.130E+02  4.054E+01
  2.850E+07  4.140E+02  4.237E+01
  2.750E+07  4.105E+02  4.513E+01
  2.650E+07  3.989E+02  4.774E+01
  2.550E+07  3.777E+02  4.884E+01
  2.449E+07  3.478E+02  4.691E+01
  2.349E+07  3.110E+02  4.110E+01
  2.249E+07  2.698E+02  3.160E+01
  2.149E+07  2.266E+02  2.034E+01
  2.049E+07  1.846E+02  1.077E+01
  1.949E+07  1.466E+02  1.411E+01
  1.849E+07  1.160E+02  1.909E+01
  1.749E+07  9.447E+01  1.954E+01
  1.649E+07  8.218E+01  1.672E+01
  1.549E+07  7.687E+01  1.317E+01
  1.449E+07  7.567E+01  1.111E+01
  1.349E+07  7.639E+01  1.157E+01
  1.249E+07  7.824E+01  1.403E+01
  1.149E+07  8.126E+01  1.614E+01
  1.049E+07  8.545E+01  1.564E+01
  9.487E+06  9.058E+01  1.012E+01
  8.485E+06  9.563E+01  6.890E+00
  7.483E+06  9.737E+01  2.881E+01
  6.481E+06  9.009E+01  4.976E+01