74-W-182

Reaction 0.0253-eV Maxwellian
Average
g-factor Resonance
Integral
14-MeV Fiss. Spec.
Average
total 28.74 (b) 29.94 (b) 1.042 5.363 (b) 6.821 (b)
elastic 8.869 (b) 9.998 (b) 1.127 2.896 (b) 4.464 (b)
inelastic ( E-thr = 100.3 keV ) 402.5 (mb) 2.290 (b)
(n,2n) ( E-thr = 8.110 MeV ) 2.058 (b) 4.355 (mb)
(n,3n) ( E-thr = 14.83 MeV ) 3.439 (μb)
(n,na) 0.000 (b) 0.000 (b) 3.167 (μb) 101.0 (μb) 121.4 (nb)
(n,2na) ( E-thr = 5.887 MeV ) 11.24 (nb) 76.51e-12 (b)
(n,np) ( E-thr = 7.134 MeV ) 55.95 (μb) 33.84 (nb)
(n,nd) ( E-thr = 12.52 MeV ) 45.90e-24 (b) 6.739e-12 (b)
(n,nt) ( E-thr = 12.90 MeV ) 558.1e-36 (b) 265.2e-15 (b)
capture 19.87 (b) 19.94 (b) 1.004 628.2 (b) 712.1 (μb) 63.38 (mb)
(n,p) ( E-thr = 1.038 MeV ) 4.104 (mb) 1.620 (μb)
(n,d) ( E-thr = 4.897 MeV ) 302.2 (μb) 66.82 (nb)
(n,t) ( E-thr = 6.224 MeV ) 2.731 (μb) 1.787 (nb)
(n,He-3) ( E-thr = 5.349 MeV ) 8.862e-15 (b) 15.61e-15 (b)
(n,a) 1.958 (μb) 1.959 (μb) 1.001 43.87 (μb) 678.4 (μb) 2.348 (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)
 .