# Keyword:FISYIELD

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FISYIELD nyld <symb(i) i=1,abs(nyld)>

When actinides are included in the list of input elements and USEFISSION is specified, then by default only U235, U238 and Pu239 will produce ssion products when they undergo fission. If nyld = 0 then no fission products are produced from any of the actinides. If nyld is a positive integer then only the actinides that are specified in the list of identifiers symb (e.g. Am242m') produce ssion products. If nyld is a negative integer then all actinides except those that are specified in the list of identifiers symb (e.g. Am242m) produce ssion products.

This facility is included so that information on the irradiated actinides alone can be obtained. Also when investigating the properties of various actinides it may be useful to be able to restrict which of these produce fission products.

Note that ssionable isotopes that have no fission yield data in the selected library do not undergo fission.

An example where the fission of U238, Pu239, Pu240 and Pu242 will produce fission products in the simulation would be:

< -- Control phase -- >
...
FISPACT
* Title of the simulation
< -- Initial phase -- >
...
USEFISSION
FISYIELD 4
U235
Pu239
Pu240
Pu242
...
< -- Inventory phase -- >
...


Alternatively, a user could include

FISYIELD 0


to remove all inclusion of fission products or

FISYIELD -1 Es256m
`

to include all fission yields except for Es256m. This is workaround method for including all fission yields, although a user could add each of the files included in the relevant fission yield directory.