92-U-238

Reaction 0.0253-eV Maxwellian
Average
g-factor Resonance
Integral
14-MeV Fiss. Spec.
Average
total 11.98 (b) 13.19 (b) 1.100 5.884 (b) 7.759 (b)
elastic 9.300 (b) 10.50 (b) 1.129 2.789 (b) 4.827 (b)
inelastic ( E-thr = 45.11 keV ) 578.1 (mb) 2.541 (b)
(n,2n) ( E-thr = 6.180 MeV ) 974.4 (mb) 14.08 (mb)
(n,3n) ( E-thr = 11.33 MeV ) 405.8 (mb) 58.45 (μb)
fission 16.80 (μb) 16.83 (μb) 1.002 1.241 (b) 1.136 (b) 306.4 (mb)
(n,fission) 16.80 (μb) 16.83 (μb) 1.002 994.5 (mb) 409.3 (mb) 294.5 (mb)
(n,n,fiss) ( E-thr = 4.000 MeV ) 586.6 (mb) 11.92 (mb)
(n,2n,fiss) ( E-thr = 10.00 MeV ) 140.1 (mb) 18.14 (μb)
(n,4n) ( E-thr = 17.90 MeV ) 2.032 (nb)
(n,3nfiss) ( E-thr = 15.50 MeV ) 36.70 (nb)
capture 2.683 (b) 2.690 (b) 1.003 275.6 (b) 589.4 (μb) 70.16 (mb)
 
νp 2.281 4.399
νd 4.634e-2 2.853e-2

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)
 .


νp, νd : numbers of prompt and delayed neutrons per fission.