95-Am-244

Reaction 0.0253-eV Maxwellian
Average
g-factor Resonance
Integral
14-MeV Fiss. Spec.
Average
total 3.313 (kb) 3.308 (kb) 0.999 5.613 (b) 7.661 (b)
elastic 11.22 (b) 12.68 (b) 1.130 2.647 (b) 4.555 (b)
inelastic ( E-thr = 72.30 keV ) 327.5 (mb) 1.632 (b)
(n,2n) ( E-thr = 5.389 MeV ) 487.3 (mb) 13.17 (mb)
(n,3n) ( E-thr = 11.78 MeV ) 20.96 (mb) 4.545 (μb)
fission 2.301 (kb) 2.294 (kb) 0.997 546.8 (b) 2.130 (b) 1.335 (b)
(n,fission) 2.301 (kb) 2.294 (kb) 0.997 546.6 (b) 1.062 (b) 1.327 (b)
(n,n,fiss) ( E-thr = 2.500 MeV ) 834.1 (mb) 7.774 (mb)
(n,2n,fiss) ( E-thr = 7.500 MeV ) 234.4 (mb) 35.46 (μb)
(n,4n) ( E-thr = 17.34 MeV ) 779.3e-12 (b)
(n,3nfiss) ( E-thr = 15.00 MeV ) 309.7e-12 (b)
capture 1.000 (kb) 999.8 (b) 0.999 421.9 (b) 1.081 (mb) 124.5 (mb)
 
νp 3.138 5.714
νd 1.380e-2 9.460e-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.