90-Th-233

MT Reaction 0.0253-eV Maxwellian
Average		 g-factor Resonance
Integral		 14-MeV Fiss. Spec.
Average
1 (n,total) 1.318 (kb) 1.323 (kb) 1.004 − 5.870 (b) 7.635 (b)
2 (n,elastic) 12.03 (b) 13.58 (b) 1.129 − 2.769 (b) 4.342 (b)
4 (n,inelastic) ( E-thr = 6.066 keV ) 408.2 (mb) 3.066 (b)
16 (n,2n) ( E-thr = 4.807 MeV ) 1.603 (b) 66.48 (mb)
17 (n,3n) ( E-thr = 11.28 MeV ) 688.0 (mb) 97.94 (μb)
18 (n,fission) 15.01 (b) 15.01 (b) 1.000 115.1 (b) 400.2 (mb) 100.2 (mb)
19 (n,f) 15.01 (b) 15.01 (b) 1.000 115.1 (b) 61.70 (mb) 98.81 (mb)
20 (n,nf) ( E-thr = 2.500 MeV ) 134.9 (mb) 1.389 (mb)
21 (n,2nf) ( E-thr = 7.500 MeV ) 203.6 (mb) 39.44 (μb)
37 (n,4n) ( E-thr = 16.42 MeV ) − 92.90 (nb)
38 (n,3nf) ( E-thr = 13.50 MeV ) 100.1e-18 (b) 7.916 (nb)
102 (n,γ) 1.291 (kb) 1.292 (kb) 1.001 574.1 (b) 1.125 (mb) 58.39 (mb)
 
456 νp 1.813 −−− 3.771 −
455 νd 7.437e-2 −−− 5.061e-2 −

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).

MT is a number that defines a reaction type. For the relation between MT and reaction type, please see here or refer to the manual of ENDF formats.
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.