| MT | Reaction | 0.0253-eV | Maxwellian Average |
g-factor | Resonance Integral |
14-MeV | Fiss. Spec. Average |
|---|---|---|---|---|---|---|---|
| 1 | (n,total) | 1.175 (kb) | 1.162 (kb) | 0.989 | − | 5.660 (b) | 7.667 (b) |
| 2 | (n,elastic) | 12.25 (b) | 13.84 (b) | 1.129 | − | 3.167 (b) | 5.085 (b) |
| 4 | (n,inelastic) | ( E-thr = 50.22 keV ) | 4.998 (mb) | 1.387 (b) | |||
| 16 | (n,2n) | ( E-thr = 5.585 MeV ) | 841.2 (mb) | 26.31 (mb) | |||
| 17 | (n,3n) | ( E-thr = 12.43 MeV ) | 266.0 (mb) | 40.08 (μb) | |||
| 18 | (n,fission) | 700.0 (b) | 700.3 (b) | 1.000 | 312.6 (b) | 1.381 (b) | 1.096 (b) |
| 37 | (n,4n) | ( E-thr = 18.25 MeV ) | − | 11.04 (nb) | |||
| 102 | (n,γ) | 462.1 (b) | 445.6 (b) | 0.964 | 308.8 (b) | 5.602 (nb) | 71.69 (mb) |
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These cross sections are calculated from JENDL-3.3 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 :
|