74-W-182

MT Reaction 0.0253-eV Maxwellian
Average
g-factor Resonance
Integral
14-MeV Fiss. Spec.
Average
1 (n,total) 29.58 (b) 30.77 (b) 1.040 5.206 (b) 6.801 (b)
2 (n,elastic) 8.869 (b) 9.992 (b) 1.127 2.550 (b) 4.369 (b)
4 (n,inelastic) ( E-thr = 100.7 keV ) 592.5 (mb) 2.363 (b)
16 (n,2n) ( E-thr = 8.099 MeV ) 2.054 (b) 3.160 (mb)
17 (n,3n) ( E-thr = 14.78 MeV ) 2.762 (μb)
22 (n,na) 0.000 (b) 0.000 (b) 1.081 (μb) 69.91 (μb) 56.45 (nb)
28 (n,np) ( E-thr = 7.124 MeV ) 86.18 (μb) 53.21 (nb)
102 (n,γ) 20.72 (b) 20.78 (b) 1.003 628.4 (b) 1.000 (mb) 65.69 (mb)
103 (n,p) ( E-thr = 1.028 MeV ) 4.736 (mb) 2.300 (μb)
104 (n,d) ( E-thr = 4.888 MeV ) 913.2 (μb) 200.3 (nb)
107 (n,a) 0.000 (b) 0.000 (b) 43.68 (μb) 2.097 (mb) 4.119 (μb)

These cross sections are calculated from JENDL-3.3 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)
 .