Is there a nuclear chemistry analog for noble gasses in that they don’t absorb neutrons at all? I know there are lots of materials that capture neutrons and don’t fission or decay, but they still absorb neutrons.
Thanks,
Rob
Zirconium rarely absorbs them. Not sure about all the noble gasses, but xenon absorbs lots.
Total guesswork, but I’d hazard that it’s always a probability, and never a probability of zero. So the question then becomes “how close to zero matters, for you?”
I’m also willing to bet that there are some compounds that include noble gas elements.
Well, whaddya know: I guessed right! Noble gas compound - Wikipedia. But that’s only for heavier noble gases, so I only get partial credit.
Got any more questions you want me to guess answers to? 
You can look for yourself:
http://www.nndc.bnl.gov/chart/reCenter.jsp?z=8&n=8
The smallest neutron absorption cross section I could find was about 2.4e-05 barns for nitrogen-15. Lead-208 is about the same, though.
I don’t think it’s possible to have a neutron absorption cross section of exactly zero, however. The only way I can think of it happening is by some kind of destructive interference between the interaction between the incoming neutron and the various nucleons in the nucleus. But they’d have to be arranged in some kind of fixed, crystalline pattern for that to happen, and they’re not.