98-Cf-253

Reaction 0.0253-eV Maxwellian
Average
g-factor Resonance
Integral
14-MeV Fiss. Spec.
Average
total 1.332 (kb) 1.338 (kb) 1.005 5.987 (b) 8.180 (b)
elastic 10.52 (b) 11.88 (b) 1.129 2.842 (b) 4.833 (b)
inelastic ( E-thr = 61.86 keV ) 254.2 (mb) 2.488 (b)
(n,2n) ( E-thr = 4.823 MeV ) 131.4 (mb) 12.67 (mb)
(n,3n) ( E-thr = 11.02 MeV ) 125.2 (mb) 18.35 (μb)
fission 1.301 (kb) 1.303 (kb) 1.002 964.8 (b) 2.631 (b) 762.2 (mb)
(n,fission) 1.301 (kb) 1.303 (kb) 1.002 963.6 (b) 753.6 (mb) 677.5 (mb)
(n,n,fiss) ( E-thr = 1.700 MeV ) 1.676 (b) 85.11 (mb)
(n,2n,fiss) ( E-thr = 7.000 MeV ) 202.3 (mb) 80.81 (μb)
(n,4n) ( E-thr = 16.15 MeV ) 19.05 (nb)
(n,3nfiss) ( E-thr = 13.50 MeV ) 6.419e-12 (b) 9.374 (nb)
capture 20.00 (b) 19.95 (b) 0.997 657.7 (b) 861.4 (μb) 83.26 (mb)
 
νp 3.839 7.171
νd 1.320e-2 9.000e-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.