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A new concept for thermal neutron based correlation and multiplicitymeasurements is proposed in this paper. The main idea of the concept consistsof using 2.223 MeV gammas (or 1.201 MeV, DE) originating in the1H(n,gamma)2D-reaction instead of using traditional thermal neutron counting.Results of investigations presented in this paper indicate that gammas fromthermal neutron capture reaction preserve the information about the correlationcharacteristics of thermal (fast) neutrons in the same time scale. Therefore,instead of thermal neutron detectors (or as a complement) one may usetraditional and inexpensive gamma detectors, such NaI, BGO, CdZnTe or any othergamma detectors. In this work we used D8x8 cm2 NaI scintillator to test theconcept. Thus, the new approach helps to address the problem of replacement of3He-counters and problems related to the specific measurements of spent nuclearfuel directly in the spent fuel pool. It has a particular importance fornuclear safeguards and security. Overall, this work represents the proof ofconcept study and reports on the experimental and numerical evidence thatthermal neutron capture gammas may be used in the context of correlation andmultiplicity measurements. Investigations were performed for a 252Cf-correlatedneutron source and an 241Am-Be-random neutron source. The related idea of GammaDifferential Die-Away approach is investigated numerically in this paper aswell, and will be tested experimentally in a future work.

Gamma Rossi-alpha, Feynman-alpha and Gamma Differential Die-Away  concepts as a potential alternative/complement to the traditional thermal  neutron based analysis in Safeguards