Experimental neutron spectra measured by BC501A at TIARA1995/2  [68c50-20a]
 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 :  20cm 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  1.766E+02  8.249E+00
  6.699E+07  4.777E+02  4.283E+01
  6.499E+07  7.983E+02  4.415E+01
  6.299E+07  7.486E+02  3.923E+01
  6.099E+07  4.569E+02  5.239E+01
  5.899E+07  2.162E+02  3.237E+01
  5.699E+07  1.275E+02  1.073E+01
  5.499E+07  1.322E+02  1.482E+01
  5.299E+07  1.528E+02  9.732E+00
  5.099E+07  1.667E+02  7.347E+00
  4.899E+07  1.735E+02  7.634E+00
  4.699E+07  1.754E+02  8.007E+00
  4.499E+07  1.733E+02  7.531E+00
  4.350E+07  1.696E+02  7.158E+00
  4.250E+07  1.663E+02  7.187E+00
  4.150E+07  1.628E+02  7.550E+00
  4.050E+07  1.593E+02  8.346E+00
  3.950E+07  1.557E+02  9.339E+00
  3.850E+07  1.520E+02  1.004E+01
  3.750E+07  1.482E+02  1.023E+01
  3.650E+07  1.441E+02  9.894E+00
  3.550E+07  1.394E+02  9.205E+00
  3.450E+07  1.340E+02  8.436E+00
  3.350E+07  1.278E+02  7.854E+00
  3.250E+07  1.209E+02  7.538E+00
  3.150E+07  1.137E+02  7.309E+00
  3.050E+07  1.068E+02  6.900E+00
  2.950E+07  1.008E+02  6.270E+00
  2.850E+07  9.587E+01  5.795E+00
  2.750E+07  9.165E+01  5.831E+00
  2.650E+07  8.759E+01  6.360E+00
  2.550E+07  8.326E+01  7.030E+00
  2.449E+07  7.859E+01  7.340E+00
  2.349E+07  7.373E+01  6.861E+00
  2.249E+07  6.890E+01  5.547E+00
  2.149E+07  6.428E+01  3.752E+00
  2.049E+07  6.002E+01  2.077E+00
  1.949E+07  5.612E+01  3.820E+00
  1.849E+07  5.240E+01  5.359E+00
  1.749E+07  4.851E+01  5.584E+00
  1.649E+07  4.439E+01  4.400E+00
  1.549E+07  4.049E+01  2.493E+00
  1.449E+07  3.753E+01  1.935E+00
  1.349E+07  3.571E+01  1.055E+00
  1.249E+07  3.449E+01  2.030E+00
  1.149E+07  3.340E+01  2.567E+00
  1.049E+07  3.267E+01  2.516E+00
  9.487E+06  3.281E+01  2.056E+00
  8.485E+06  3.377E+01  1.171E+00
  7.483E+06  3.222E+01  1.671E+00