98-Cf-254

Reaction 0.0253-eV Maxwellian
Average
g-factor Resonance
Integral
14-MeV Fiss. Spec.
Average
total 17.26 (b) 18.68 (b) 1.083 5.993 (b) 8.087 (b)
elastic 10.72 (b) 12.11 (b) 1.129 2.745 (b) 4.750 (b)
inelastic ( E-thr = 45.90 keV ) 408.6 (mb) 1.512 (b)
(n,2n) ( E-thr = 6.056 MeV ) 475.0 (mb) 10.36 (mb)
(n,3n) ( E-thr = 10.88 MeV ) 87.35 (mb) 15.66 (μb)
fission 2.001 (b) 2.001 (b) 1.000 103.1 (b) 2.272 (b) 1.795 (b)
(n,fission) 2.001 (b) 2.001 (b) 1.000 102.9 (b) 1.311 (b) 1.785 (b)
(n,n,fiss) ( E-thr = 2.300 MeV ) 391.4 (mb) 9.198 (mb)
(n,2n,fiss) ( E-thr = 7.500 MeV ) 569.3 (mb) 132.5 (μb)
(n,4n) ( E-thr = 17.08 MeV ) 2.536 (nb)
(n,3nfiss) ( E-thr = 13.00 MeV ) 20.97 (nb) 41.42 (nb)
capture 4.502 (b) 4.510 (b) 1.002 37.20 (b) 747.9 (μb) 18.25 (mb)
 
νp 3.831 7.247
νd 1.939e-2 1.320e-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.