53-I-129

Reaction 0.0253-eV Maxwellian
Average
g-factor Resonance
Integral
14-MeV Fiss. Spec.
Average
total 34.65 (b) 35.23 (b) 1.017 4.975 (b) 5.875 (b)
elastic 4.337 (b) 4.896 (b) 1.129 3.291 (b) 4.479 (b)
inelastic ( E-thr = 28.02 keV ) 213.3 (mb) 1.331 (b)
(n,2n) ( E-thr = 8.916 MeV ) 1.464 (b) 1.620 (mb)
(n,3n) ( E-thr = 15.80 MeV ) 1.302 (μb)
(n,na) ( E-thr = 2.696 MeV ) 29.07 (μb) 12.45 (nb)
(n,np) ( E-thr = 6.860 MeV ) 1.294 (mb) 279.3 (nb)
(n,nd) ( E-thr = 13.38 MeV ) 0.000 (b) 142.6e-12 (b)
(n,nt) ( E-thr = 13.49 MeV ) 0.000 (b) 19.43e-12 (b)
capture 30.32 (b) 30.33 (b) 1.000 33.25 (b) 1.001 (mb) 63.00 (mb)
(n,p) ( E-thr = 721.1 keV ) 3.117 (mb) 2.077 (μb)
(n,d) ( E-thr = 4.531 MeV ) 369.9 (μb) 113.4 (nb)
(n,t) ( E-thr = 7.150 MeV ) 8.229 (μb) 14.01 (nb)
(n,a) 0.000 (b) 0.000 (b) 9.327 (μb) 1.497 (mb) 719.9 (nb)

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)
 .