90-Th-230

MT Reaction 0.0253-eV Maxwellian
Average
g-factor Resonance
Integral
14-MeV Fiss. Spec.
Average
1 (n,total) 33.81 (b) 35.50 (b) 1.050 5.847 (b) 7.700 (b)
2 (n,elastic) 10.39 (b) 11.70 (b) 1.126 2.757 (b) 4.769 (b)
4 (n,inelastic) ( E-thr = 53.43 keV ) 424.3 (mb) 2.584 (b)
16 (n,2n) ( E-thr = 6.824 MeV ) 1.856 (b) 12.23 (mb)
17 (n,3n) ( E-thr = 12.10 MeV ) 243.6 (mb) 38.29 (μb)
18 (n,fission) 9.494 (mb) 9.500 (mb) 1.001 785.5 (mb) 563.5 (mb) 203.8 (mb)
19 (n,f) 9.494 (mb) 9.500 (mb) 1.001 582.0 (mb) 79.65 (mb) 194.4 (mb)
20 (n,nf) ( E-thr = 2.500 MeV ) 459.2 (mb) 9.389 (mb)
21 (n,2nf) ( E-thr = 9.000 MeV ) 24.68 (mb) 7.071 (μb)
37 (n,4n) ( E-thr = 19.24 MeV ) 2.743e-12 (b)
38 (n,3nf) ( E-thr = 14.50 MeV ) 333.7e-12 (b)
102 (n,γ) 23.41 (b) 23.79 (b) 1.016 1.042 (kb) 963.7 (μb) 129.6 (mb)
 
456 νp 1.970 3.308
455 νd 2.362e-2 1.621e-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.