63-Eu-0

Reaction 0.0253-eV Maxwellian
Average
g-factor Resonance
Integral
14-MeV Fiss. Spec.
Average
total 4.554 (kb) 4.118 (kb) 0.904 5.285 (b) 6.616 (b)
elastic 6.939 (b) 7.475 (b) 1.077 2.951 (b) 3.823 (b)
inelastic ( E-thr = 21.68 keV ) 499.3 (mb) 2.497 (b)
(n,2n) ( E-thr = 7.986 MeV ) 1.825 (b) 2.579 (mb)
(n,3n) ( E-thr = 14.45 MeV ) 2.684 (μb)
(n,na) 0.000 (b) 0.000 (b) 6.523 (μb) 350.0 (μb) 295.5 (nb)
(n,2na) ( E-thr = 5.734 MeV ) 160.2 (nb) 187.7e-12 (b)
(n,np) ( E-thr = 4.923 MeV ) 415.2 (μb) 123.9 (nb)
(n,nd) ( E-thr = 10.72 MeV ) 199.9e-12 (b) 366.8e-12 (b)
(n,nt) ( E-thr = 10.34 MeV ) 29.06e-12 (b) 60.62e-12 (b)
(n,n He-3) ( E-thr = 12.96 MeV ) 631.5e-18 (b) 21.50e-12 (b)
capture 4.547 (kb) 4.111 (kb) 0.904 2.240 (kb) 884.4 (μb) 294.2 (mb)
(n,p) 0.000 (b) 0.000 (b) 44.27 (μb) 4.749 (mb) 3.162 (μb)
(n,d) ( E-thr = 2.684 MeV ) 1.590 (mb) 389.7 (nb)
(n,t) ( E-thr = 4.425 MeV ) 36.33 (μb) 9.229 (nb)
(n,He-3) ( E-thr = 5.484 MeV ) 10.35e-12 (b) 379.7e-15 (b)
(n,a) 4.566 (μb) 4.163 (μb) 0.912 106.7 (μb) 2.484 (mb) 5.940 (μb)

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)
 .