94-Pu-241

Reaction 0.0253-eV Maxwellian
Average
g-factor Resonance
Integral
14-MeV Fiss. Spec.
Average
total 1.387 (kb) 1.446 (kb) 1.043 5.999 (b) 8.009 (b)
elastic 11.26 (b) 12.48 (b) 1.108 2.670 (b) 4.543 (b)
inelastic ( E-thr = 42.15 keV ) 382.3 (mb) 1.752 (b)
(n,2n) ( E-thr = 5.263 MeV ) 603.4 (mb) 13.69 (mb)
(n,3n) ( E-thr = 11.82 MeV ) 78.67 (mb) 11.08 (μb)
fission 1.012 (kb) 1.060 (kb) 1.047 567.4 (b) 2.260 (b) 1.626 (b)
(n,fission) 1.012 (kb) 1.060 (kb) 1.047 566.9 (b) 730.9 (mb) 1.606 (b)
(n,n,fiss) ( E-thr = 1.600 MeV ) 1.142 (b) 20.15 (mb)
(n,2n,fiss) ( E-thr = 6.500 MeV ) 386.9 (mb) 66.71 (μb)
(n,4n) ( E-thr = 17.49 MeV ) 1.480 (nb)
(n,3nfiss) ( E-thr = 13.50 MeV ) 20.27e-18 (b) 4.927 (nb)
capture 363.1 (b) 373.7 (b) 1.029 180.4 (b) 920.7 (μb) 71.97 (mb)
 
νp 2.931 5.027
νd 1.600e-2 9.854e-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.