98-Cf-250

Reaction 0.0253-eV Maxwellian
Average
g-factor Resonance
Integral
14-MeV Fiss. Spec.
Average
total 2.132 (kb) 2.081 (kb) 0.976 5.973 (b) 8.048 (b)
elastic 2.247 (b) 2.002 (b) 0.891 2.736 (b) 4.810 (b)
inelastic ( E-thr = 42.89 keV ) 404.6 (mb) 1.686 (b)
(n,2n) ( E-thr = 6.652 MeV ) 339.3 (mb) 2.469 (mb)
(n,3n) ( E-thr = 12.26 MeV ) 21.52 (mb) 3.225 (μb)
fission 112.0 (b) 105.0 (b) 0.937 133.4 (b) 2.466 (b) 1.489 (b)
(n,fission) 112.0 (b) 105.0 (b) 0.937 133.2 (b) 1.780 (b) 1.482 (b)
(n,n,fiss) ( E-thr = 2.300 MeV ) 662.6 (mb) 7.513 (mb)
(n,2n,fiss) ( E-thr = 9.500 MeV ) 25.46 (mb) 4.337 (μb)
(n,4n) ( E-thr = 19.26 MeV ) 76.38e-15 (b)
(n,3nfiss) ( E-thr = 14.50 MeV ) 1.398 (nb)
capture 2.018 (kb) 1.974 (kb) 0.978 11.90 (kb) 952.0 (μb) 57.44 (mb)
 
νp 3.630 6.710
νd 4.060e-3 2.800e-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.