Do we want to keep the Recoil class?
The Recoil class is basically a Monte-Carlo sampler for recoil momenta in beta decays. The implementation is specific to allowed beta decays and furthermore appears to be specific to the spin sequence in the beta decays of 12B and 12N into 12C, although I'm not entirely sure which one (perhaps 1+ -> 1+). Jonas Refsgaard's PhD thesis may help us find out.
In any case, the question is whether we want to keep the Recoil class as a part of sim3a, given that it is specific to beta decays and therefore not needed for reaction studies, e.g. p+11B.
@klytje , your thoughts?