Nuclear Physics Data for Reactor Kinetics

Walker, J. P.; Weaver, David R.

doi:10.1007/978-1-4613-2862-9_1

Cited by 3 publications

(1 citation statement)

References 90 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Thus we can speak in terms of the time averaged behavior. Delayed neutrons are emitted long after the associated prompt fission neutrons (which for our discussion are emitted essentially instantaneously at the time of fission), on a typical time scale of ~1/10 -100 s [14,15]. This is also much longer than the time prompt fission neutrons take to emerge from measurement item and subsequently persist in the detector system (for commonly used moderated 3 He based detection systems the characteristic detector die-away time is of the order of 10"s μs) [1,7,11].…”

Section: Derivation Of Böhnel -Like Point Model Equation With Delayedmentioning

confidence: 99%

Incorporating delayed neutrons into the point-model equations routinely used for neutron coincidence counting in nuclear safeguards

Croft¹,

Favalli

2017

Annals of Nuclear Energy

View full text Add to dashboard Cite

We extend the familiar Bӧ hnel point-model equations, which are routinely used to interpret neutron coincidence counting rates, by including the contribution of delayed neutrons. After developing the necessary equations we use them to show, by providing some numerical results, what the quantitative impact of neglecting delayed neutrons is across the full range of practical nuclear safeguards applications. The influence of delayed neutrons is predicted to be small for the types of deeply sub-critical assay problems which concern the nuclear safeguards community, smaller than uncertainties arising from other factors. This is most clearly demonstrated by considering the change in the effective (α,n)-to-spontaneous fission prompt-neutron ratio that the inclusion of delayed neutrons gives rise to. That the influence of delayed neutrons is small is fortunate, and our results justify the long standing practice of simply neglecting them in the analysis of field measurements.

show abstract