92-U-0

Reaction 0.0253-eV Maxwellian
Average
g-factor Resonance
Integral
14-MeV Fiss. Spec.
Average
total 16.93 (b) 18.04 (b) 1.065 5.884 (b) 7.758 (b)
elastic 9.342 (b) 10.54 (b) 1.129 2.789 (b) 4.825 (b)
inelastic ( E-thr = 77.33 eV ) 577.0 (mb) 2.536 (b)
(n,2n) ( E-thr = 5.320 MeV ) 971.3 (mb) 14.07 (mb)
(n,3n) ( E-thr = 11.33 MeV ) 403.1 (mb) 58.07 (μb)
fission 4.213 (b) 4.114 (b) 0.977 3.208 (b) 1.143 (b) 313.0 (mb)
(n,fission) 4.213 (b) 4.114 (b) 0.977 2.961 (b) 412.0 (mb) 301.1 (mb)
(n,n,fiss) ( E-thr = 3.500 MeV ) 587.9 (mb) 11.95 (mb)
(n,2n,fiss) ( E-thr = 7.500 MeV ) 142.8 (mb) 18.68 (μb)
(n,4n) ( E-thr = 17.90 MeV ) 2.019 (nb)
(n,3nfiss) ( E-thr = 14.50 MeV ) 36.48 (nb)
capture 3.380 (b) 3.381 (b) 1.000 274.6 (b) 591.6 (μb) 70.28 (mb)

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).

Maxwellian Average :
σmacs(T) =
2
 
 
π
EU
 
EL
σ(E,T) ⋅ E ⋅ exp (
E
  
kBT
) dE
 
EU
 
EL
E ⋅ exp (
E
  
kBT
) dE
,
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 :
σri(T) =
EU
 
EL
σ(E,T) ⋅
1
 
E
dE ,
with  EL = 0.5 eV  and  EU = 10 MeV.
U-235 Thermal Fission-Neutron Spectrum Average (Fiss. Spec. Average) :
σfacs(T) =
EU
 
EL
σ(E,T) ⋅
 
4
 
πa3b
⋅ exp (
ab E
     
4 a
) ⋅ sinh
 
bE
dE
 
EU
 
EL
 
4
 
πa3b
⋅ exp (
ab E
     
4 a
) ⋅ sinh
 
bE
dE
,
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 :
g(T) =
σmacs(T)
 
σ(0.0253 eV,T)
 .