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Croft, Stuart; Favalli, Andrea; Fugate, Glenn A.; Gauld, Ian C; McElroy, Robert Dennis; Simone, Angela; Swinhoe, Martyn T; Venkataraman, Ramkumar

doi:10.1016/j.nima.2018.11.067

Cited by 5 publications

(1 citation statement)

References 11 publications

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“…It is believed that rather than being sensitive to energy spectrum, the factor limiting accuracy of simulations is likely to be the thick target (α,n) yield. The uncertainty in the yield is reported as being 576 ± 7.3% , 474 ± 4.4% (Miller et al 2014), 503 ± ~4% (Kulisek et al 2017; uncertainty estimated by Croft et al 2020), and 507 ± ~1.1% (Croft et al 2020).…”

Section: Discussionmentioning

confidence: 99%

(α,n) nuclear data scoping study

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Brown

Romano

et al. 2020

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Neutrons from the (a,n) reaction are an important component of nondestructive assay techniques to determine enriched uranium and other actinide inventories in a variety of critical points in the nuclear fuel cycle. However, uncertainties in the cross section, total neutron yield and neutron spectrum, and gamma emissions from these reactions, such as 19 F(a,n) and 17,18 O(a,n), introduce large uncertainties in the determination of mass of actinides of interest and can represent several significant quantities in unaccounted material in certain facility processes. Calculations and measurements depend on accurate nuclear data; however, much of the relevant data in use today was measured in the 1980s and earlier and has not been updated. Thus, the current uncertainties in the cross sections and neutron emission spectra are unacceptably large. This report documents the results of a scoping study of (α,n) reaction data that considered the current state of the data and recommends areas of improvement. It also addresses the codes use to calculate the (a,n) neutron and gamma source terms and recommends code improvements to support required analysis.

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