74-W-0

Reaction 0.0253-eV Maxwellian
Average
g-factor Resonance
Integral
14-MeV Fiss. Spec.
Average
total 23.14 (b) 23.82 (b) 1.029 5.423 (b) 6.867 (b)
elastic 4.988 (b) 5.628 (b) 1.128 2.954 (b) 4.406 (b)
inelastic ( E-thr = 46.74 keV ) 428.1 (mb) 2.405 (b)
(n,2n) ( E-thr = 6.225 MeV ) 2.028 (b) 8.696 (mb)
(n,3n) ( E-thr = 13.02 MeV ) 10.32 (mb) 10.64 (μb)
(n,na) 16.96e-36 (b) 17.23e-36 (b) 0.000 1.084 (μb) 54.58 (μb) 49.65 (nb)
(n,2na) ( E-thr = 4.443 MeV ) 50.24 (nb) 48.23e-12 (b)
(n,np) ( E-thr = 6.604 MeV ) 23.07 (μb) 18.80 (nb)
(n,nd) ( E-thr = 11.12 MeV ) 70.19e-15 (b) 19.93e-12 (b)
(n,nt) ( E-thr = 12.23 MeV ) 5.299e-24 (b) 965.6e-15 (b)
(n,n He-3) ( E-thr = 13.36 MeV ) 353.0e-27 (b) 289.7e-15 (b)
capture 18.15 (b) 18.19 (b) 1.002 355.1 (b) 742.1 (μb) 47.64 (mb)
(n,p) 0.000 (b) 0.000 (b) 8.021 (μb) 2.790 (mb) 973.4 (nb)
(n,d) ( E-thr = 4.367 MeV ) 198.4 (μb) 47.77 (nb)
(n,t) ( E-thr = 4.830 MeV ) 3.339 (μb) 1.866 (nb)
(n,He-3) ( E-thr = 4.083 MeV ) 6.133e-15 (b) 7.613e-15 (b)
(n,a) 5.918 (μb) 5.921 (μb) 1.001 180.1 (μb) 642.6 (μb) 1.342 (μb)

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)
 .