94-Pu-242

Reaction 0.0253-eV Maxwellian
Average		 g-factor Resonance
Integral		 14-MeV Fiss. Spec.
Average
total 28.21 (b) 29.47 (b) 1.044 − 5.975 (b) 7.983 (b)
elastic 8.326 (b) 9.373 (b) 1.126 − 2.630 (b) 4.717 (b)
inelastic ( E-thr = 44.73 keV ) 457.8 (mb) 2.008 (b)
(n,2n) ( E-thr = 6.336 MeV ) 741.9 (mb) 6.390 (mb)
(n,3n) ( E-thr = 11.60 MeV ) 132.5 (mb) 18.15 (μb)
fission 2.436 (mb) 2.454 (mb) 1.007 4.359 (b) 2.006 (b) 1.151 (b)
(n,fission) 2.436 (mb) 2.454 (mb) 1.007 3.861 (b) 774.2 (mb) 1.125 (b)
(n,n,fiss) ( E-thr = 1.159 MeV ) 1.075 (b) 25.82 (mb)
(n,2n,fiss) ( E-thr = 8.000 MeV ) 157.2 (mb) 22.02 (μb)
(n,4n) ( E-thr = 18.16 MeV ) − 147.8e-12 (b)
(n,3nfiss) ( E-thr = 13.50 MeV ) 974.8e-15 (b) 9.526 (nb)
capture 19.88 (b) 20.09 (b) 1.010 1.126 (kb) 1.059 (mb) 98.18 (mb)
 
νp 2.878 −−− 4.804 −
νd 1.530e-2 −−− 1.230e-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.