74-W-0

MT Reaction 0.0253-eV Maxwellian
Average
g-factor Resonance
Integral
14-MeV Fiss. Spec.
Average
1 (n,total) 23.24 (b) 23.90 (b) 1.028 5.208 (b) 6.750 (b)
2 (n,elastic) 4.987 (b) 5.622 (b) 1.127 2.544 (b) 4.222 (b)
4 (n,inelastic) ( E-thr = 46.76 keV ) 498.9 (mb) 2.475 (b)
16 (n,2n) ( E-thr = 6.225 MeV ) 2.150 (b) 7.211 (mb)
17 (n,3n) ( E-thr = 13.02 MeV ) 10.18 (mb) 8.622 (μb)
22 (n,na) 0.000 (b) 0.000 (b) 447.0 (nb) 34.51 (μb) 25.88 (nb)
28 (n,np) ( E-thr = 7.124 MeV ) 30.69 (μb) 22.47 (nb)
102 (n,γ) 18.26 (b) 18.28 (b) 1.001 317.3 (b) 1.000 (mb) 45.89 (mb)
103 (n,p) ( E-thr = 287.1 keV ) 3.098 (mb) 1.232 (μb)
104 (n,d) ( E-thr = 4.888 MeV ) 424.2 (μb) 95.55 (nb)
107 (n,a) 0.000 (b) 0.000 (b) 26.92 (μb) 1.395 (mb) 2.261 (μb)

These cross sections are calculated from JENDL-3.2 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)
 .