LOW-PWXS

    Sets the correspondence between the Fluka and the pointwise low energy neutron
    xsec materials

     
WHAT(1)
 = isomer code of the target (Z x 10000 + A x 10 + m) Z, A, m, are the
               atomic, mass and isomer number of the isotope
               no default, a value < 0 resets the association to null
               If what(1) = 1.0, it is interpreted as to let FLUKA choose the
               corresponding pointwise cross ection data sets for all
               isotopes of the elements defined by what(4)-what(6)

     
WHAT(2)
 = if > 0 a uniform grid data set is looked for, 0 (default) means non
               uniform grid data set, < 0 resets to default, actually 0 or < 0
               behave the same. Warning: uniform grid data sets are not yet
               supported in the production version

     
WHAT(3)
 = pointwise xsec temperature (def.=296, 0 is ignored, < 0 resets to
               default), actually 0 or < 0 behave the same

     
WHAT(4)
 =      from material "
WHAT(4)
" ....    (def. 3)

     
WHAT(5)
 = ....  to  material "
WHAT(5)
" ....    (def. 
WHAT(4)
)

     
WHAT(6)
 = ....  in  step of  "
WHAT(6)
"         (def. 1)

     SDUM10  = extra character for the pointwise cross section file
               (default=blank)
               =1-H PWXS   -> means the built-in 1-H  pointwise cross
                              sections (no external file needed)
               =2-H PWXS   -> means the built-in 2-H  pointwise cross
                              sections (no external file needed)
               =3-HE PWXS  -> means the built-in 3-He pointwise cross
                              sections (no external file needed)
               =4-HE PWXS  -> means the built-in 4-He pointwise cross
                              sections (no external file needed)
               =12-C PWXS  -> means the built-in 12-C pointwise cross
                              sections (no external file needed)

               The file name looked for by Fluka in the directory
               $FLUPRO/pwxs is composed as:
         <isomer code>(-<extra character if any>)(-uni)-<temp>.pwx
               where -uni is present if 
WHAT(2)
 > 0


     
Default

     
Notes:
         1) If pointwise cross sections are requested for a compound the
            request is ignored. This card works only for elements, nevertheless
            it will silently ignore possible compounds included in the list
            defined by what(4)-what(6)
         2) The list of available isotopes and temperatures, as well as of the
            originating evluated data file can be easily obtained looking in
            the $FLUPRO/pwxs directory


     Examples:

 31P at 296 K from Endf/b-8r0:
 *...+....1....+....2....+....3....+....4....+....5....+....6....+....7....+...
 LOW-PWXS   150310.0                296.0      P-31      P-31          endfb8r0

 All isotopes for all materials at 296 K, leaving Fluka to decide which
 evaluations to pick up for each of them:
 *...+....1....+....2....+....3....+....4....+....5....+....6....+....7....+...
 LOW-PWXS   1.0                                 3.0  @LASTMAT

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