74-W-183

MT Reaction 0.0253-eV Maxwellian
Average
g-factor Resonance
Integral
14-MeV Fiss. Spec.
Average
1 (n,total) 12.81 (b) 13.14 (b) 1.025 5.372 (b) 6.830 (b)
2 (n,elastic) 2.409 (b) 2.718 (b) 1.128 2.898 (b) 4.034 (b)
4 (n,inelastic) ( E-thr = 46.74 keV ) 457.7 (mb) 2.722 (b)
16 (n,2n) ( E-thr = 6.225 MeV ) 2.009 (b) 17.60 (mb)
17 (n,3n) ( E-thr = 14.33 MeV ) 4.815 (μb)
22 (n,na) 0.000 (b) 0.000 (b) 306.3 (nb) 60.62 (μb) 29.54 (nb)
24 (n,2na) ( E-thr = 4.443 MeV ) 312.5 (nb) 147.0e-12 (b)
28 (n,np) ( E-thr = 7.263 MeV ) 34.13 (μb) 28.80 (nb)
32 (n,nd) ( E-thr = 11.12 MeV ) 490.5e-15 (b) 101.1e-12 (b)
33 (n,nt) ( E-thr = 12.45 MeV ) 13.50e-27 (b) 840.8e-15 (b)
41 (n,2np) ( E-thr = 13.36 MeV ) 2.467e-24 (b) 2.023e-12 (b)
102 (n,γ) 10.41 (b) 10.42 (b) 1.001 339.0 (b) 810.2 (μb) 56.42 (mb)
103 (n,p) ( E-thr = 290.2 keV ) 4.744 (mb) 1.865 (μb)
104 (n,d) ( E-thr = 5.026 MeV ) 374.8 (μb) 82.83 (nb)
105 (n,t) ( E-thr = 4.830 MeV ) 10.31 (μb) 3.872 (nb)
106 (n,He-3) ( E-thr = 5.847 MeV ) 12.28e-15 (b) 19.91e-15 (b)
107 (n,a) 36.65 (μb) 36.67 (μb) 1.001 1.154 (mb) 1.211 (mb) 3.107 (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).

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)
 .