Experimental neutron spectra measured by BC501A at TIARA1995/2  [68c25-20a]
 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  1.075E+02  1.161E+01
  6.699E+07  2.578E+02  3.584E+01
  6.499E+07  4.950E+02  5.163E+01
  6.299E+07  5.337E+02  5.786E+01
  6.099E+07  3.761E+02  5.715E+01
  5.899E+07  1.767E+02  2.683E+01
  5.699E+07  1.227E+02  1.586E+01
  5.499E+07  1.511E+02  1.293E+01
  5.299E+07  1.752E+02  7.720E+00
  5.099E+07  1.886E+02  6.939E+00
  4.899E+07  2.004E+02  7.982E+00
  4.699E+07  2.139E+02  9.695E+00
  4.499E+07  2.236E+02  9.849E+00
  4.350E+07  2.260E+02  9.252E+00
  4.250E+07  2.257E+02  8.648E+00
  4.150E+07  2.251E+02  8.233E+00
  4.050E+07  2.246E+02  9.058E+00
  3.950E+07  2.247E+02  1.055E+01
  3.850E+07  2.254E+02  1.168E+01
  3.750E+07  2.266E+02  1.202E+01
  3.650E+07  2.281E+02  1.145E+01
  3.550E+07  2.297E+02  1.029E+01
  3.450E+07  2.308E+02  9.231E+00
  3.350E+07  2.304E+02  9.033E+00
  3.250E+07  2.279E+02  9.938E+00
  3.150E+07  2.229E+02  1.136E+01
  3.050E+07  2.159E+02  1.159E+01
  2.950E+07  2.081E+02  9.616E+00
  2.850E+07  2.007E+02  7.213E+00
  2.750E+07  1.938E+02  7.256E+00
  2.650E+07  1.867E+02  1.026E+01
  2.550E+07  1.787E+02  1.458E+01
  2.449E+07  1.697E+02  1.716E+01
  2.349E+07  1.599E+02  1.598E+01
  2.249E+07  1.500E+02  1.211E+01
  2.149E+07  1.406E+02  7.582E+00
  2.049E+07  1.321E+02  3.391E+00
  1.949E+07  1.239E+02  6.874E+00
  1.849E+07  1.153E+02  1.162E+01
  1.749E+07  1.064E+02  1.269E+01
  1.649E+07  9.818E+01  8.522E+00
  1.549E+07  9.107E+01  4.777E+00
  1.449E+07  8.510E+01  6.005E+00
  1.349E+07  8.112E+01  2.627E+00
  1.249E+07  7.975E+01  4.568E+00
  1.149E+07  7.988E+01  6.147E+00
  1.049E+07  8.000E+01  5.095E+00
  9.487E+06  7.939E+01  3.646E+00
  8.485E+06  7.886E+01  2.627E+00
  7.483E+06  8.070E+01  1.763E+00