74-W-183

MT Reaction 0.0253-eV Maxwellian
Average
g-factor Resonance
Integral
14-MeV Fiss. Spec.
Average
1 (n,total) 12.51 (b) 12.82 (b) 1.025 5.215 (b) 6.821 (b)
2 (n,elastic) 2.388 (b) 2.693 (b) 1.128 2.851 (b) 3.914 (b)
4 (n,inelastic) ( E-thr = 46.76 keV ) 484.7 (mb) 2.842 (b)
16 (n,2n) ( E-thr = 6.226 MeV ) 1.871 (b) 14.12 (mb)
17 (n,3n) ( E-thr = 14.32 MeV ) 6.158 (μb)
22 (n,na) 0.000 (b) 0.000 (b) 525.3 (nb) 57.97 (μb) 35.64 (nb)
28 (n,np) ( E-thr = 7.253 MeV ) 675.8 (μb) 151.0 (nb)
102 (n,γ) 10.12 (b) 10.13 (b) 1.001 334.8 (b) 1.000 (mb) 49.24 (mb)
103 (n,p) ( E-thr = 287.1 keV ) 3.266 (mb) 1.804 (μb)
104 (n,d) ( E-thr = 5.016 MeV ) 709.1 (μb) 154.8 (nb)
107 (n,a) 0.000 (b) 0.000 (b) 83.69 (μb) 1.906 (mb) 5.950 (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)
 .