63-Eu-157

MT Reaction 0.0253-eV Maxwellian
Average
g-factor Resonance
Integral
14-MeV Fiss. Spec.
Average
1 (n,total) 4.062 (kb) 4.071 (kb) 1.002 5.434 (b) 6.890 (b)
2 (n,elastic) 9.030 (b) 10.20 (b) 1.129 2.962 (b) 4.348 (b)
4 (n,inelastic) ( E-thr = 77.20 keV ) 551.2 (mb) 2.490 (b)
16 (n,2n) ( E-thr = 7.494 MeV ) 1.918 (b) 6.764 (mb)
17 (n,3n) ( E-thr = 13.87 MeV ) 2.036 (mb) 9.600 (μb)
22 (n,na) ( E-thr = 1.215 MeV ) 4.343 (μb) 1.834 (nb)
28 (n,np) ( E-thr = 7.434 MeV ) 73.75 (μb) 42.57 (nb)
32 (n,nd) ( E-thr = 12.49 MeV ) 118.0e-21 (b) 44.54e-12 (b)
33 (n,nt) ( E-thr = 12.03 MeV ) 691.9e-21 (b) 9.862e-12 (b)
41 (n,2np) ( E-thr = 14.72 MeV ) 684.1e-15 (b)
102 (n,γ) 4.052 (kb) 4.054 (kb) 1.001 1.925 (kb) 734.5 (μb) 47.42 (mb)
103 (n,p) ( E-thr = 1.964 MeV ) 2.539 (mb) 677.0 (nb)
104 (n,d) ( E-thr = 5.195 MeV ) 207.2 (μb) 49.95 (nb)
105 (n,t) ( E-thr = 6.188 MeV ) 2.497 (μb) 1.752 (nb)
106 (n,He-3) ( E-thr = 9.414 MeV ) 1.094e-21 (b) 335.2e-18 (b)
107 (n,a) 3.981e-12 (b) 4.038e-12 (b) 1.014 572.6 (nb) 197.9 (μb) 66.68 (nb)

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).

MT is a number that defines a reaction type. For the relation between MT and reaction type, please see here or refer to the manual of ENDF formats.

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)
 .