26-Fe-58

Reaction 0.0253-eV Maxwellian
Average
g-factor Resonance
Integral
14-MeV Fiss. Spec.
Average
(n,total) 7.828 (b) 8.671 (b) 1.108 2.662 (b) 3.829 (b)
(n,elastic) 6.528 (b) 7.370 (b) 1.129 1.267 (b) 3.200 (b)
(n,inelastic) ( E-thr = 824.9 keV ) 419.8 (mb) 626.4 (mb)
(n,2n) ( E-thr = 10.22 MeV ) 946.7 (mb) 321.8 (μb)
(n,na) ( E-thr = 7.781 MeV ) 411.3 (μb) 248.0 (nb)
(n,np) ( E-thr = 12.03 MeV ) 80.31 (μb) 136.8 (nb)
(n,γ) 1.300 (b) 1.301 (b) 1.001 1.358 (b) 1.025 (mb) 1.829 (mb)
(n,p) ( E-thr = 5.405 MeV ) 12.62 (mb) 11.21 (μb)
(n,a) ( E-thr = 1.412 MeV ) 11.74 (mb) 23.91 (μb)
MT = 203 ( E-thr = 5.405 MeV ) 12.70 (mb) 11.35 (μb)
MT = 207 ( E-thr = 1.412 MeV ) 12.15 (mb) 24.16 (μb)

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)
 .