A proposal from a nuclear amateur.
If LENR is "fusion" this experiment may consume 11B and makes 4He. But if LENR involves free neutrons there would be a different reaction. 10B+n → 7Li+4He+gamma + 2.31 MeV The 10B isotope is good at capturing neutrons. It would be fine to looking for gamma radiation and Li isotope anomalies. And it would be interesting to make the experiment with borax or boric acid enriched in 10B and also with 11B. This is something how can give a clue to the nature of the LENR phenomenon. I'm sorrow for this idea may involve to advanced and expensive methods. TG