Experimental neutron spectra measured by BC501A at TIARA1995/2  [68c50-40a]
 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  8.311E+00  7.593E-01
  6.699E+07  2.991E+01  3.887E+00
  6.499E+07  5.900E+01  4.051E+00
  6.299E+07  6.739E+01  3.832E+00
  6.099E+07  5.139E+01  5.569E+00
  5.899E+07  3.004E+01  3.502E+00
  5.699E+07  2.068E+01  1.169E+00
  5.499E+07  2.097E+01  1.642E+00
  5.299E+07  2.280E+01  1.094E+00
  5.099E+07  2.404E+01  8.512E-01
  4.899E+07  2.485E+01  9.248E-01
  4.699E+07  2.544E+01  1.010E+00
  4.499E+07  2.583E+01  9.558E-01
  4.350E+07  2.610E+01  8.742E-01
  4.250E+07  2.634E+01  8.460E-01
  4.150E+07  2.667E+01  8.726E-01
  4.050E+07  2.708E+01  9.835E-01
  3.950E+07  2.752E+01  1.141E+00
  3.850E+07  2.789E+01  1.255E+00
  3.750E+07  2.810E+01  1.301E+00
  3.650E+07  2.807E+01  1.284E+00
  3.550E+07  2.775E+01  1.227E+00
  3.450E+07  2.716E+01  1.170E+00
  3.350E+07  2.636E+01  1.142E+00
  3.250E+07  2.545E+01  1.141E+00
  3.150E+07  2.448E+01  1.127E+00
  3.050E+07  2.349E+01  1.062E+00
  2.950E+07  2.247E+01  9.674E-01
  2.850E+07  2.142E+01  9.311E-01
  2.750E+07  2.038E+01  1.021E+00
  2.650E+07  1.938E+01  1.229E+00
  2.550E+07  1.842E+01  1.457E+00
  2.449E+07  1.747E+01  1.567E+00
  2.349E+07  1.649E+01  1.472E+00
  2.249E+07  1.550E+01  1.170E+00
  2.149E+07  1.452E+01  7.356E-01
  2.049E+07  1.359E+01  3.107E-01
  1.949E+07  1.270E+01  6.628E-01
  1.849E+07  1.185E+01  9.814E-01
  1.749E+07  1.104E+01  9.911E-01
  1.649E+07  1.031E+01  6.990E-01
  1.549E+07  9.646E+00  3.228E-01
  1.449E+07  9.051E+00  2.986E-01
  1.349E+07  8.566E+00  1.575E-01
  1.249E+07  8.261E+00  3.903E-01
  1.149E+07  8.132E+00  5.315E-01
  1.049E+07  8.111E+00  5.157E-01
  9.487E+06  8.217E+00  4.181E-01
  8.485E+06  8.547E+00  2.284E-01
  7.483E+06  8.878E+00  4.239E-01