I don’t know enough about this kind of science to completely understand how nitrogen plus gamma rays gives you carbon and berryllium. I’m guessing that you get a nitrogen isotope that decays into Carbon 14 which then (or another carbon isotope) decays into berryllium and an alpha particle. I’m sure I’m way off.
Any experts out there?
To answer part of my own question:
14N7 + n = 14C6 + p
(according to wikipedia)