98-Cf-252

Reaction 0.0253-eV Maxwellian
Average
g-factor Resonance
Integral
14-MeV Fiss. Spec.
Average
total 64.81 (b) 66.05 (b) 1.019 5.980 (b) 8.062 (b)
elastic 11.06 (b) 12.47 (b) 1.127 2.348 (b) 4.606 (b)
inelastic ( E-thr = 45.90 keV ) 372.6 (mb) 1.113 (b)
(n,2n) ( E-thr = 6.197 MeV ) 382.1 (mb) 4.640 (mb)
(n,3n) ( E-thr = 11.33 MeV ) 101.7 (mb) 13.80 (μb)
fission 33.03 (b) 32.96 (b) 0.998 109.4 (b) 2.770 (b) 2.322 (b)
(n,fission) 33.03 (b) 32.96 (b) 0.998 109.1 (b) 1.912 (b) 2.306 (b)
(n,n,fiss) ( E-thr = 2.100 MeV ) 794.0 (mb) 15.35 (mb)
(n,2n,fiss) ( E-thr = 8.500 MeV ) 63.78 (mb) 10.16 (μb)
(n,4n) ( E-thr = 17.98 MeV ) 101.6e-12 (b)
(n,3nfiss) ( E-thr = 13.50 MeV ) 969.4e-18 (b) 2.576 (nb)
capture 20.71 (b) 20.62 (b) 0.996 44.62 (b) 762.9 (μb) 14.02 (mb)
 
νp 3.884 7.104
νd 8.300e-3 5.900e-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.