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The emission of neutrons and gamma rays by fission fragments reveal importantinformation about the properties of fragments immediately following scission.The initial fragment properties, correlations between fragments, and emissioncompetition give rise to correlations in neutron-gamma emission. Neutron-gammacorrelations are important in nonproliferation applications because thecharacterization of fissionable samples relies on the identification ofsignatures in the measured radiation. Furthermore, recent theoretical andexperimental advances have proposed to explain the mechanism of angularmomentum generation in fission. In this paper, we present a novel analysismethod of neutrons and gamma rays emitted by fission fragments that allows usto discern structure in the observed correlations. We have analyzed datacollected on \ce{^{252}Cf}(sf) at the Chi-Nu array at the Los Alamos NeutronScience Center. Through our analysis of the energy-differential neutron-gammamultiplicity covariance, we have observed enhanced neutron-gamma correlations,corresponding to rotational band gamma-ray transitions, at gamma-ray energiesof $0.7$ and $1.2$ MeV. To shed light on the origin of this structure, wecompare the experimental data with the predictions of three model calculations.The origin of the observed correlation structure is understood in terms of apositive spin-energy correlation in the generation of angular momentum infission.

Structure in the Event-by-Event Energy-Dependent Neutron-Gamma Multiplicity Correlations in $^{252}\text{Cf}$(sf)