53-I-0

Reaction 0.0253-eV Maxwellian
Average
g-factor Resonance
Integral
14-MeV Fiss. Spec.
Average
total 9.657 (b) 10.08 (b) 1.044 4.977 (b) 5.879 (b)
elastic 3.255 (b) 3.673 (b) 1.129 3.050 (b) 4.353 (b)
inelastic ( E-thr = 58.06 keV ) 117.6 (mb) 1.455 (b)
(n,2n) ( E-thr = 9.218 MeV ) 1.787 (b) 1.465 (mb)
(n,3n) ( E-thr = 16.42 MeV ) 742.3 (nb)
(n,na) ( E-thr = 2.202 MeV ) 97.57 (μb) 28.58 (nb)
(n,np) ( E-thr = 6.257 MeV ) 3.188 (mb) 607.7 (nb)
(n,nd) ( E-thr = 13.12 MeV ) 0.000 (b) 234.8e-12 (b)
(n,nt) ( E-thr = 13.52 MeV ) 0.000 (b) 22.84e-12 (b)
capture 6.403 (b) 6.406 (b) 1.001 153.9 (b) 1.002 (mb) 70.71 (mb)
(n,p) 0.000 (b) 0.000 (b) 322.5 (μb) 14.45 (mb) 16.64 (μb)
(n,d) ( E-thr = 3.928 MeV ) 812.2 (μb) 179.7 (nb)
(n,t) ( E-thr = 6.890 MeV ) 15.36 (μb) 15.20 (nb)
(n,He-3) ( E-thr = 7.644 MeV ) 1.703e-15 (b) 3.752e-12 (b)
(n,a) 0.000 (b) 0.000 (b) 15.74 (μb) 1.279 (mb) 979.9 (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)
 .