100-Fm-255

Reaction 0.0253-eV Maxwellian
Average
g-factor Resonance
Integral
14-MeV Fiss. Spec.
Average
total 3.641 (kb) 3.649 (kb) 1.002 6.018 (b) 8.293 (b)
elastic 9.319 (b) 10.52 (b) 1.129 2.833 (b) 4.497 (b)
inelastic ( E-thr = 60.24 keV ) 299.4 (mb) 1.516 (b)
(n,2n) ( E-thr = 5.197 MeV ) 326.5 (mb) 15.77 (mb)
(n,3n) ( E-thr = 11.74 MeV ) 55.17 (mb) 7.740 (μb)
fission 3.362 (kb) 3.366 (kb) 1.001 1.460 (kb) 2.496 (b) 2.224 (b)
(n,fission) 3.362 (kb) 3.366 (kb) 1.001 1.460 (kb) 1.578 (b) 2.217 (b)
(n,n,fiss) ( E-thr = 2.500 MeV ) 813.8 (mb) 7.428 (mb)
(n,2n,fiss) ( E-thr = 7.500 MeV ) 107.7 (mb) 19.61 (μb)
(n,4n) ( E-thr = 17.30 MeV ) 846.9e-12 (b)
(n,3nfiss) ( E-thr = 14.50 MeV ) 2.711 (nb)
capture 270.1 (b) 270.3 (b) 1.001 116.3 (b) 673.8 (μb) 38.85 (mb)
 
νp 4.000 7.500
νd 2.733e-3 1.885e-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.