74-W-180

Reaction 0.0253-eV Maxwellian
Average
g-factor Resonance
Integral
14-MeV Fiss. Spec.
Average
total 48.57 (b) 49.86 (b) 1.027 5.370 (b) 6.845 (b)
elastic 10.94 (b) 12.34 (b) 1.127 2.844 (b) 4.380 (b)
inelastic ( E-thr = 102.1 keV ) 674.7 (mb) 2.301 (b)
(n,2n) ( E-thr = 8.459 MeV ) 1.838 (b) 2.653 (mb)
(n,3n) ( E-thr = 15.46 MeV ) 1.148 (μb)
(n,na) 14.14e-33 (b) 14.36e-33 (b) 0.000 33.04 (μb) 356.0 (μb) 1.102 (μb)
(n,2na) ( E-thr = 5.689 MeV ) 92.33 (nb) 405.7e-12 (b)
(n,np) ( E-thr = 6.604 MeV ) 138.5 (μb) 52.77 (nb)
(n,nd) ( E-thr = 12.34 MeV ) 2.441e-21 (b) 7.676e-12 (b)
(n,nt) ( E-thr = 12.94 MeV ) 13.83e-27 (b) 232.5e-15 (b)
(n,n He-3) ( E-thr = 14.58 MeV ) 178.9e-15 (b)
capture 37.62 (b) 37.52 (b) 0.997 248.2 (b) 780.9 (μb) 161.0 (mb)
(n,p) 0.000 (b) 0.000 (b) 80.64 (μb) 7.548 (mb) 4.939 (μb)
(n,d) ( E-thr = 4.367 MeV ) 513.1 (μb) 109.3 (nb)
(n,t) ( E-thr = 6.049 MeV ) 4.002 (μb) 2.284 (nb)
(n,He-3) ( E-thr = 4.083 MeV ) 1.684e-12 (b) 141.6e-15 (b)
(n,a) 117.8 (μb) 117.9 (μb) 1.001 626.1 (μb) 1.071 (mb) 19.68 (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)
 .