63-Eu-151

Reaction 0.0253-eV Maxwellian
Average
g-factor Resonance
Integral
14-MeV Fiss. Spec.
Average
(n,total) 9.172 (kb) 8.264 (kb) 0.901 5.227 (b) 6.550 (b)
(n,elastic) 3.202 (b) 3.024 (b) 0.944 2.980 (b) 3.729 (b)
(n,inelastic) ( E-thr = 21.68 keV ) 453.6 (mb) 2.467 (b)
(n,2n) ( E-thr = 7.986 MeV ) 1.781 (b) 2.733 (mb)
(n,3n) ( E-thr = 14.45 MeV ) 3.193 (μb)
(n,na) 0.000 (b) 0.000 (b) 12.27 (μb) 391.4 (μb) 485.5 (nb)
(n,2na) ( E-thr = 5.734 MeV ) 334.7 (nb) 312.9e-12 (b)
(n,np) ( E-thr = 4.923 MeV ) 515.1 (μb) 154.7 (nb)
(n,nd) ( E-thr = 10.72 MeV ) 418.1e-12 (b) 631.4e-12 (b)
(n,nt) ( E-thr = 10.34 MeV ) 60.75e-12 (b) 99.84e-12 (b)
(n,n He-3) ( E-thr = 12.96 MeV ) 1.321e-15 (b) 35.38e-12 (b)
(n,γ) 9.169 (kb) 8.261 (kb) 0.901 3.143 (kb) 830.4 (μb) 351.5 (mb)
(n,p) 0.000 (b) 0.000 (b) 58.84 (μb) 5.678 (mb) 4.081 (μb)
(n,d) ( E-thr = 2.684 MeV ) 2.225 (mb) 581.3 (nb)
(n,t) ( E-thr = 4.425 MeV ) 67.66 (μb) 15.51 (nb)
(n,He-3) ( E-thr = 5.484 MeV ) 21.60e-12 (b) 717.0e-15 (b)
(n,a) 8.771 (μb) 7.938 (μb) 0.905 178.4 (μb) 3.683 (mb) 9.953 (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)
 .