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arXiv · 1907.01483

Event-by-Event Multiplicity Correlations in $^{252}$Cf(sf)

Stefano Marin·Vladimir A. Protopopescu·Ramona Vogt·Matthew J. Marcath·M. Stephan Okar·Michael Y. Hua·Patrick Talou·Patricia F. Schuster·Shaun D. Clarke·Sara A. Pozzi
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Abstract

Excited nuclear fragments are emitted during nuclear fission. The de-excitation of these fission fragments takes place as sequential emission of neutrons followed by photons. A correlation between neutron and photon multiplicities accompanying fission is thus expected. Fission event generators based on established statistical nuclear physics models predict a negative event-by-event correlation in neutron-photon multiplicity. A survey of published experimental results of an event-by-event covariance between the neutron and photon multiplicities emitted following the spontaneous fission of $^{252}$Cf is presented. Analytic unfolding expressions are developed in this work to determine the bias introduced by background sources, particle misclassification, pulse pileup, and inelastic photon production. The published experimental data are re-analyzed using these unfolding techniques and are found to be in qualitative agreement with the predictions of model-based calculations. In particular, we have concluded that there exists a significant event-by-event neutron-photon emission competition following the spontaneous fission of $^{252}$Cf.

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Stefano Marin, Vladimir A. Protopopescu, Ramona Vogt, Matthew J. Marcath, M. Stephan Okar, Michael Y. Hua, Patrick Talou, Patricia F. Schuster, Shaun D. Clarke, Sara A. Pozzi. 2019-12-18. Event-by-Event Multiplicity Correlations in $^{252}$Cf(sf). https://doi.org/10.1016/j.nima.2020.163907

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