90-Th-234

MT Reaction 0.0253-eV Maxwellian
Average
g-factor Resonance
Integral
14-MeV Fiss. Spec.
Average
1 (n,total) 13.75 (b) 15.35 (b) 1.116 5.872 (b) 7.741 (b)
2 (n,elastic) 11.93 (b) 13.47 (b) 1.129 2.772 (b) 4.918 (b)
4 (n,inelastic) ( E-thr = 49.76 keV ) 454.6 (mb) 2.726 (b)
16 (n,2n) ( E-thr = 6.217 MeV ) 1.506 (b) 23.91 (mb)
17 (n,3n) ( E-thr = 11.02 MeV ) 936.6 (mb) 142.6 (μb)
18 (n,fission) 5.002 (mb) 5.007 (mb) 1.001 195.7 (mb) 202.2 (mb) 33.95 (mb)
19 (n,f) 5.002 (mb) 5.007 (mb) 1.001 121.6 (mb) 85.61 (mb) 30.01 (mb)
20 (n,nf) ( E-thr = 2.700 MeV ) 95.01 (mb) 3.946 (mb)
21 (n,2nf) ( E-thr = 8.500 MeV ) 21.60 (mb) 3.421 (μb)
37 (n,4n) ( E-thr = 17.49 MeV ) 12.42 (nb)
38 (n,3nf) ( E-thr = 14.00 MeV ) 0.000 (b) 20.11 (nb)
102 (n,γ) 1.801 (b) 1.802 (b) 1.001 31.40 (b) 1.007 (mb) 37.17 (mb)
 
456 νp 1.862 3.598
455 νd 1.096e-1 7.440e-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.