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Table 4.

Fission Energy Release from the ENDF/B-VII.1 evaluated library. The neutron capture value is obtained from reference [39].

Energy modes Fractions 235U 238U 239Pu 241Pu Time
(MeV) (MeV) (MeV) (MeV)
Ekin fission fragments 80% 169.1 169.8 175.5 175.3 Instant
Ekin Fission Neutrons 2–3% 4.8 4.6 6.2 6.0 Instant
Beta decay of FPs 3–4% 6.5 8.5 6.7 7.6 Delayed
Gamma-rays prompt 3–4% 6.6 6.7 5.2 6.4 Instant
Gamma-rays delayed 3–4% 6.3 8.2 5.3 6.6 Delayed
Neutrinos 4–5% 8.7 11.4 7.1 8.8 Delayed (unrecoverable)
Neutron capture 3–5% 6-11 Instant/Delayed

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