MCBE: User-defined binned neutron energy distribution

        Titles:  MCBE: User-defined binned neutron energy distribution
        ==============================================================
 
    Contact:  J. Loach, Oxford.
 
    Revision History:-
    ================
 
    5.02   J. Loach  First version.


 
Titles Files
------------
 
mc_generator.dat
 
 
Description
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    Neutron energy distribution.
    User specifies N bins and then gives N+1 pairs of numbers
    specifying the bin ranges and cumulative probabilities.
 
    Example (flat distribution 0-5 Mev) :

      10               [ Number of bins           ]
      0.0000 0.0000    [ Prob(E lt 0.0 MeV) = 0.0 ]
      0.5000 0.1000    [ Prob(E lt 0.5 MeV) = 0.1 ]
      1.0000 0.2000      ...
      1.5000 0.3000
      2.0000 0.4000
      2.5000 0.5000
      3.0000 0.6000
      3.5000 0.7000
      4.0000 0.8000
      4.5000 0.9000      ...
      5.0000 1.0001    [ Prob(E lt 5.0 MeV) = 1.0 ]

Data Words
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        Data types: B(bit), I, F, D(double), H(hollerith 4 char)
 
        Fixed length Database Header.  See titles_dbhdr.html
 
  Word Type  Description
  ---- ----  -----------

    1   I    Number of bins N

  Then N+1 entries :

  i + (i = 1,3,5, ...)

    1   F    Energy E
    2   F    Probability that neutron has energy lower than E