90-Th-0

Reaction 0.0253-eV Maxwellian
Average
g-factor Resonance
Integral
14-MeV Fiss. Spec.
Average
total 20.38 (b) 22.02 (b) 1.080 5.859 (b) 7.716 (b)
elastic 13.04 (b) 14.72 (b) 1.128 2.740 (b) 4.832 (b)
inelastic ( E-thr = 49.58 keV ) 468.1 (mb) 2.690 (b)
(n,2n) ( E-thr = 6.468 MeV ) 1.766 (b) 16.76 (mb)
(n,3n) ( E-thr = 11.61 MeV ) 521.9 (mb) 72.39 (μb)
fission 53.71 (μb) 53.80 (μb) 1.002 374.7 (mb) 361.1 (mb) 79.94 (mb)
(n,fission) 53.71 (μb) 53.80 (μb) 1.002 264.7 (mb) 118.8 (mb) 74.72 (mb)
(n,n,fiss) ( E-thr = 2.700 MeV ) 197.7 (mb) 5.214 (mb)
(n,2n,fiss) ( E-thr = 8.500 MeV ) 44.61 (mb) 7.378 (μb)
(n,4n) ( E-thr = 18.43 MeV ) 731.2e-12 (b)
(n,3nfiss) ( E-thr = 14.00 MeV ) 0.000 (b) 9.799 (nb)
capture 7.338 (b) 7.300 (b) 0.995 84.29 (b) 1.136 (mb) 95.98 (mb)

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)
 .