| MT | Reaction | 0.0253-eV | Maxwellian Average |
g-factor | Resonance Integral |
14-MeV | Fiss. Spec. Average |
|---|---|---|---|---|---|---|---|
| 1 | (n,total) | 282.1 (b) | 304.4 (b) | 1.079 | − | 5.861 (b) | 7.718 (b) |
| 2 | (n,elastic) | 11.73 (b) | 13.24 (b) | 1.130 | − | 2.806 (b) | 4.344 (b) |
| 4 | (n,inelastic) | ( E-thr = 40.17 keV ) | 403.3 (mb) | 1.073 (b) | |||
| 16 | (n,2n) | ( E-thr = 5.904 MeV ) | 175.3 (mb) | 2.079 (mb) | |||
| 17 | (n,3n) | ( E-thr = 13.60 MeV ) | 282.1 (nb) | 85.41 (nb) | |||
| 18 | (n,fission) | 250.1 (b) | 267.2 (b) | 1.068 | 1.053 (kb) | 2.475 (b) | 2.194 (b) |
| 19 | (n,f) | 250.1 (b) | 267.2 (b) | 1.068 | 1.053 (kb) | 1.678 (b) | 2.182 (b) |
| 20 | (n,nf) | ( E-thr = 2.000 MeV ) | 644.9 (mb) | 11.81 (mb) | |||
| 21 | (n,2nf) | ( E-thr = 7.500 MeV ) | 151.4 (mb) | 25.59 (μb) | |||
| 38 | (n,3nf) | ( E-thr = 16.00 MeV ) | − | 2.077e-12 (b) | |||
| 102 | (n,γ) | 20.01 (b) | 22.72 (b) | 1.136 | 160.7 (b) | 693.9 (μb) | 103.5 (mb) |
| 456 | νp | 2.442 | − | − | − | 3.926 | − |
| 455 | νd | 3.457e-3 | − | − | − | 2.397e-3 | − |
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These cross sections are calculated from JENDL-4.0 at 300K.
The background color of each cell noted a cross section means the order of the cross-section value.
The unit of cross section, (b), means barns, and SI prefixes are used as following.
(kb) → 103(b), (mb) → 10−3(b),
(μb) → 10−6(b), (nb) → 10−9(b).
MT is a number that defines a reaction type. For the relation between MT and reaction type, please see here or refer to the manual of ENDF formats.
Maxwellian Average :
where T denotes the temperature, and kB the Boltzmann constant.
The upper and lower limits of integration, EL and EU
are set to 10−5 eV and 10 eV, respectively.
Resonance Integral :
with EL = 0.5 eV and EU = 10 MeV.
U-235 Thermal Fission-Neutron Spectrum Average (Fiss. Spec. Average) :
with EL = 10−5 eV and EU = 20 MeV.
The parameters a and b are 0.988 MeV and 2.249 MeV−1, respectively.
Westcott g-factor :
νp,
νd
: numbers of prompt and delayed neutrons per fission.
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