92-U-234

Reaction 0.0253-eV Maxwellian
Average
g-factor Resonance
Integral
14-MeV Fiss. Spec.
Average
total 118.2 (b) 118.3 (b) 1.001 5.874 (b) 7.785 (b)
elastic 17.82 (b) 19.80 (b) 1.111 2.720 (b) 4.720 (b)
inelastic ( E-thr = 43.69 keV ) 474.1 (mb) 1.729 (b)
(n,2n) ( E-thr = 6.874 MeV ) 605.0 (mb) 2.573 (mb)
(n,3n) ( E-thr = 12.66 MeV ) 5.367 (mb) 2.424 (μb)
fission 67.02 (mb) 65.80 (mb) 0.982 5.195 (b) 2.066 (b) 1.222 (b)
(n,fission) 67.02 (mb) 65.80 (mb) 0.982 4.679 (b) 735.8 (mb) 1.198 (b)
(n,n,fiss) ( E-thr = 4.000 MeV ) 1.168 (b) 24.30 (mb)
(n,2n,fiss) ( E-thr = 11.00 MeV ) 162.6 (mb) 23.66 (μb)
(n,3nfiss) ( E-thr = 16.50 MeV ) 8.342 (nb)
capture 100.3 (b) 98.39 (b) 0.981 609.5 (b) 856.1 (μb) 108.2 (mb)
 
νp 2.354 4.230
νd 1.053e-2 7.930e-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.