92-U-230

Reaction 0.0253-eV Maxwellian
Average
g-factor Resonance
Integral
14-MeV Fiss. Spec.
Average
total 237.1 (b) 239.2 (b) 1.009 5.849 (b) 7.745 (b)
elastic 11.83 (b) 13.35 (b) 1.129 2.741 (b) 4.420 (b)
inelastic ( E-thr = 51.95 keV ) 415.6 (mb) 829.6 (mb)
(n,2n) ( E-thr = 7.701 MeV ) 173.6 (mb) 138.0 (μb)
(n,3n) ( E-thr = 13.81 MeV ) 12.63 (μb) 216.5 (nb)
fission 25.01 (b) 25.01 (b) 1.000 503.7 (b) 2.518 (b) 2.409 (b)
(n,fission) 25.01 (b) 25.01 (b) 1.000 503.3 (b) 1.391 (b) 2.388 (b)
(n,n,fiss) ( E-thr = 1.900 MeV ) 1.125 (b) 20.96 (mb)
(n,2n,fiss) ( E-thr = 9.500 MeV ) 3.472 (mb) 3.066 (μb)
(n,3nfiss) ( E-thr = 16.00 MeV ) 44.66e-12 (b)
capture 200.1 (b) 200.0 (b) 1.000 137.7 (b) 783.4 (μb) 84.75 (mb)
 
νp 2.356 3.756
νd 2.397e-3 1.667e-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.