95-Am-241

Reaction 0.0253-eV Maxwellian
Average
g-factor Resonance
Integral
14-MeV Fiss. Spec.
Average
total 699.2 (b) 707.5 (b) 1.012 5.583 (b) 7.651 (b)
elastic 11.82 (b) 12.83 (b) 1.085 2.269 (b) 4.663 (b)
inelastic ( E-thr = 41.35 keV ) 341.5 (mb) 1.351 (b)
(n,2n) ( E-thr = 6.675 MeV ) 260.9 (mb) 1.155 (mb)
(n,3n) ( E-thr = 12.65 MeV ) 395.6 (μb) 122.9 (nb)
fission 3.122 (b) 3.191 (b) 1.022 13.28 (b) 2.710 (b) 1.395 (b)
(n,fission) 3.122 (b) 3.191 (b) 1.022 12.93 (b) 1.653 (b) 1.378 (b)
(n,n,fiss) ( E-thr = 4.000 MeV ) 1.006 (b) 16.62 (mb)
(n,2n,fiss) ( E-thr = 11.00 MeV ) 50.94 (mb) 7.195 (μb)
(n,3nfiss) ( E-thr = 17.50 MeV ) 50.04e-12 (b)
capture 684.3 (b) 691.4 (b) 1.010 1.588 (kb) 1.240 (mb) 238.6 (mb)
 
νp 3.111 5.141
νd 4.900e-3 3.567e-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.