94-Pu-239

Reaction 0.0253-eV Maxwellian
Average
g-factor Resonance
Integral
14-MeV Fiss. Spec.
Average
total 1.028 (kb) 1.110 (kb) 1.080 5.933 (b) 7.835 (b)
elastic 8.813 (b) 9.728 (b) 1.104 2.944 (b) 4.396 (b)
inelastic ( E-thr = 7.894 keV ) 416.4 (mb) 1.581 (b)
(n,2n) ( E-thr = 5.670 MeV ) 229.6 (mb) 3.325 (mb)
(n,3n) ( E-thr = 12.70 MeV ) 2.318 (mb) 988.9 (nb)
fission 747.4 (b) 790.5 (b) 1.058 301.0 (b) 2.334 (b) 1.802 (b)
(n,fission) 747.4 (b) 790.5 (b) 1.058 300.6 (b) 1.079 (b) 1.781 (b)
(n,n,fiss) ( E-thr = 1.100 MeV ) 958.0 (mb) 20.89 (mb)
(n,2n,fiss) ( E-thr = 7.000 MeV ) 297.1 (mb) 53.67 (μb)
(n,4n) ( E-thr = 18.60 MeV ) 1.949e-12 (b)
(n,3nfiss) ( E-thr = 15.50 MeV ) 196.8e-12 (b)
capture 271.5 (b) 310.1 (b) 1.142 179.7 (b) 847.4 (μb) 52.61 (mb)
 
νp 2.872 4.935
νd 6.220e-3 4.260e-3

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.