“…and C which are, in an integral sense, sensitive to the fundamental processes in volved in thermalization. Both experimental techniques mentioned above have been used exten sively to study all the common moderators (24,29,30) H20, D20, C, Be, ZrH1.8, etc. The experiments must be performed with a great deal of care and even then, disagreements between various experimenters tend to remain unresolved.…”