96-Cm-249

Reaction 0.0253-eV Maxwellian
Average
g-factor Resonance
Integral
14-MeV Fiss. Spec.
Average
total 21.57 (b) 22.89 (b) 1.062 5.961 (b) 8.293 (b)
elastic 9.920 (b) 11.20 (b) 1.129 2.749 (b) 4.523 (b)
inelastic ( E-thr = 26.33 keV ) 407.8 (mb) 2.506 (b)
(n,2n) ( E-thr = 4.732 MeV ) 495.2 (mb) 36.47 (mb)
(n,3n) ( E-thr = 10.97 MeV ) 263.7 (mb) 43.25 (μb)
fission 10.00 (b) 10.01 (b) 1.001 437.7 (b) 2.041 (b) 1.212 (b)
(n,fission) 10.00 (b) 10.01 (b) 1.001 437.3 (b) 856.7 (mb) 1.197 (b)
(n,n,fiss) ( E-thr = 2.100 MeV ) 590.8 (mb) 15.00 (mb)
(n,2n,fiss) ( E-thr = 6.000 MeV ) 593.9 (mb) 206.3 (μb)
(n,4n) ( E-thr = 16.15 MeV ) 41.97 (nb)
(n,3nfiss) ( E-thr = 12.50 MeV ) 574.7e-15 (b) 32.53 (nb)
capture 1.601 (b) 1.602 (b) 1.001 56.87 (b) 736.7 (μb) 14.52 (mb)
 
νp 3.320 6.316
νd 2.880e-2 1.960e-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.