I have been saying for years now that a cold reactor will cause gamma radiation. IMHO, this is due to the failure to form a Bose condensate among many Surface Plasmon Polaritons (SPP)s. Lack of sufficient polariton pumping allows the SPP to initiate the LENR reaction, but not enough thermal pumping to create a bose condensate among the SPPs to spread the radiation around to thermalize or downshift gamma level radiation through super-absorption among many SPPs.
Low temperature means many SPP working along thereby creating gamma because no downshifting is possible. High temperatures means many SPPs working together in a BEC to share energy through super-absorption. SPP pumping is similar to laser pumping https://en.wikipedia.org/wiki/Laser_pumping Until the SPP pumping gets to an inversion condition, a condensate cannot be formed. Weak pumping means no laser beam is produced.
