Hi!
in the raspa.pdf you can find some information about cutoffs on page 18. General information about the cutoff radius can be found in any molecular simulation book e.g. Frenkel and Smit. Cutoff means that the potential is only considered up to a certain value of radius.
In raspa for every cutoff value there are defaults, but you should really take care of the cutoff radius yourself because they should be considered as a part of your forcefield. If you use a different cutoff than you will probably receive different results!
You can get default values from the output file of your simulation (if you don't set any value for cutoffs). You get:
CutOff VDW : 14.000000 (196.000000)
CutOff VDW switching on: 12.600000 (158.760000)
CutOff charge-charge : 14.000000 (196.000000)
CutOff charge-charge switching on: 9.100000 (82.810000)
CutOff charge-bonddipole : 12.000000 (144.000000)
CutOff charge-bondipole switching on: 8.400000 (70.560000)
CutOff bonddipole-bonddipole : 12.000000 (144.000000)
CutOff bonddipole-bondipole switching on: 9.000000 (81.000000)
It's always a good idea to check your input with the output file.
Best Christopher