Experimental neutron spectra measured by BC501A at TIARA1995/2  [68c25-40a]
 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 :  40cm from 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  5.036E+00  6.597E-01
  6.699E+07  9.936E+00  2.103E+00
  6.499E+07  2.360E+01  3.078E+00
  6.299E+07  3.368E+01  3.594E+00
  6.099E+07  2.137E+01  3.929E+00
  5.899E+07  1.346E+01  1.802E+00
  5.699E+07  1.407E+01  1.112E+00
  5.499E+07  1.517E+01  9.061E-01
  5.299E+07  1.580E+01  5.613E-01
  5.099E+07  1.669E+01  5.294E-01
  4.899E+07  1.857E+01  6.233E-01
  4.699E+07  2.082E+01  7.906E-01
  4.499E+07  2.203E+01  8.311E-01
  4.350E+07  2.221E+01  7.548E-01
  4.250E+07  2.226E+01  6.694E-01
  4.150E+07  2.244E+01  6.097E-01
  4.050E+07  2.285E+01  6.978E-01
  3.950E+07  2.349E+01  8.529E-01
  3.850E+07  2.432E+01  9.626E-01
  3.750E+07  2.531E+01  9.946E-01
  3.650E+07  2.638E+01  9.480E-01
  3.550E+07  2.743E+01  8.611E-01
  3.450E+07  2.829E+01  8.054E-01
  3.350E+07  2.875E+01  8.581E-01
  3.250E+07  2.868E+01  1.048E+00
  3.150E+07  2.810E+01  1.251E+00
  3.050E+07  2.720E+01  1.241E+00
  2.950E+07  2.632E+01  9.555E-01
  2.850E+07  2.567E+01  6.602E-01
  2.750E+07  2.533E+01  6.997E-01
  2.650E+07  2.519E+01  1.192E+00
  2.550E+07  2.507E+01  1.900E+00
  2.449E+07  2.478E+01  2.302E+00
  2.349E+07  2.418E+01  2.154E+00
  2.249E+07  2.323E+01  1.616E+00
  2.149E+07  2.195E+01  9.498E-01
  2.049E+07  2.040E+01  3.315E-01
  1.949E+07  1.877E+01  7.951E-01
  1.849E+07  1.743E+01  1.465E+00
  1.749E+07  1.660E+01  1.602E+00
  1.649E+07  1.619E+01  9.539E-01
  1.549E+07  1.590E+01  4.526E-01
  1.449E+07  1.545E+01  7.515E-01
  1.349E+07  1.485E+01  2.838E-01
  1.249E+07  1.439E+01  5.722E-01
  1.149E+07  1.438E+01  8.423E-01
  1.049E+07  1.462E+01  6.867E-01
  9.487E+06  1.468E+01  4.628E-01
  8.485E+06  1.481E+01  3.424E-01
  7.483E+06  1.542E+01  1.937E-01