92-U-232

Reaction 0.0253-eV Maxwellian
Average
g-factor Resonance
Integral
14-MeV Fiss. Spec.
Average
total 162.7 (b) 160.1 (b) 0.984 5.864 (b) 7.762 (b)
elastic 10.81 (b) 12.15 (b) 1.123 2.468 (b) 4.465 (b)
inelastic ( E-thr = 47.78 keV ) 420.5 (mb) 1.110 (b)
(n,2n) ( E-thr = 7.300 MeV ) 401.1 (mb) 759.5 (μb)
(n,3n) ( E-thr = 13.20 MeV ) 771.4 (μb) 1.171 (μb)
fission 76.52 (b) 74.83 (b) 0.978 363.7 (b) 2.570 (b) 2.063 (b)
(n,fission) 76.52 (b) 74.83 (b) 0.978 363.1 (b) 963.3 (mb) 2.031 (b)
(n,n,fiss) ( E-thr = 3.500 MeV ) 1.579 (b) 32.25 (mb)
(n,2n,fiss) ( E-thr = 11.50 MeV ) 28.44 (mb) 8.848 (μb)
(n,3nfiss) ( E-thr = 15.50 MeV ) 36.68 (nb)
capture 75.39 (b) 73.16 (b) 0.970 172.9 (b) 816.4 (μb) 121.3 (mb)
 
νp 3.123 5.019
νd 5.030e-3 3.510e-3

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.