Speaking of neutron identity in the context of Widom/Larsen (ultra low momentum neutron) or in the context of Meulenberg dense hydrogen (DDL) – which may be identical if the truth be known… ;-}
… there is the possibility that an advanced and small fission design could benefit greatly from an “alternative neutron”. That is the important point. Perhaps this outcome is a wishful thinking interpretation of the Didyk and Wisniewski paper- since it is not clear what they are talking about with palladium. BTW Peter Hagelstein mentions their paper in “Anomalies in Fracture Experiments, and Energy Exchange Between Vibrations and Nuclei.” Hagelstein and Chaudhary - Meccanica 50, no. 5 (July 15, 2014): 1189–1203, so the information did not go uncommented wrt LENR. In short, all that one needs to bring nuclear fission into a new paradigm of cost effectiveness is to include an extra DDL into the picture below (assuming dense hydrogen is similar enough to a neutron to induce fission in the heavy target. A chain reaction is far easier to engineer with an extra avenue of propagation (4:1 instead of 3:1).