95-Am-242

Reaction 0.0253-eV Maxwellian
Average
g-factor Resonance
Integral
14-MeV Fiss. Spec.
Average
total 2.758 (kb) 2.930 (kb) 1.062 5.645 (b) 7.793 (b)
elastic 7.386 (b) 8.284 (b) 1.122 2.497 (b) 4.422 (b)
inelastic ( E-thr = 44.28 keV ) 405.5 (mb) 1.493 (b)
(n,2n) ( E-thr = 5.561 MeV ) 220.2 (mb) 7.430 (mb)
(n,3n) ( E-thr = 12.24 MeV ) 3.114 (mb) 1.068 (μb)
fission 2.421 (kb) 2.569 (kb) 1.061 1.055 (kb) 2.518 (b) 1.833 (b)
(n,fission) 2.421 (kb) 2.569 (kb) 1.061 1.055 (kb) 1.387 (b) 1.823 (b)
(n,n,fiss) ( E-thr = 2.500 MeV ) 994.8 (mb) 9.657 (mb)
(n,2n,fiss) ( E-thr = 7.500 MeV ) 135.8 (mb) 21.14 (μb)
(n,4n) ( E-thr = 18.21 MeV ) 6.943e-12 (b)
(n,3nfiss) ( E-thr = 15.50 MeV ) 140.0e-12 (b)
capture 330.3 (b) 353.5 (b) 1.070 204.8 (b) 1.026 (mb) 36.07 (mb)
 
νp 3.264 5.155
νd 6.659e-3 5.775e-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.