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Table 1

The recommended data set of the 8-group DN parameters for fission of 240Pu by fast neutrons expanded from the 6-group model (the LANL expansion method [3]).

The LANL expansion method. Pu-240_fast: Fast Spectrum, 8-groups DN parameters, Keepin et al. (1957) [7].

Gr. No., i T(i),
Half-lives, s
a(i),
Rel. Abun.
± 1 sigma
1 55.6 0.022 ± 0.003
2 24.5 0.207 ± 0.005
3 16.3 0.080 ± 0.002
4 5.21 0.161 ± 0.055
5 2.37 0.314 ± 0.009
6 1.04 0.105 ± 0.010
7 0.424 0.079 ± 0.017
8 0.195 0.032 ± 0.003

Average Half-life: Sum[a(i)* T(i)] = 9.32 ± 0.66 s.

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