94-Pu-246

Reaction 0.0253-eV Maxwellian
Average
g-factor Resonance
Integral
14-MeV Fiss. Spec.
Average
total 91.07 (b) 92.72 (b) 1.018 6.026 (b) 8.022 (b)
elastic 10.92 (b) 12.33 (b) 1.129 2.769 (b) 4.866 (b)
inelastic ( E-thr = 46.19 keV ) 487.0 (mb) 2.507 (b)
(n,2n) ( E-thr = 5.806 MeV ) 875.8 (mb) 22.36 (mb)
(n,3n) ( E-thr = 10.60 MeV ) 493.1 (mb) 105.4 (μb)
fission 3.201 (mb) 3.202 (mb) 1.000 2.027 (b) 1.396 (b) 580.6 (mb)
(n,fission) 3.201 (mb) 3.202 (mb) 1.000 1.611 (b) 334.5 (mb) 551.3 (mb)
(n,n,fiss) ( E-thr = 1.100 MeV ) 664.5 (mb) 29.36 (mb)
(n,2n,fiss) ( E-thr = 7.500 MeV ) 396.6 (mb) 54.89 (μb)
(n,4n) ( E-thr = 16.64 MeV ) 22.72 (nb)
(n,3nfiss) ( E-thr = 12.00 MeV ) 618.5 (μb) 426.4 (nb)
capture 80.03 (b) 80.07 (b) 1.001 68.09 (b) 959.7 (μb) 42.24 (mb)
 
νp 2.580 5.324
νd 9.820e-2 6.620e-2

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)
 .


νp, νd : numbers of prompt and delayed neutrons per fission.