55-Cs-137

Reaction 0.0253-eV Maxwellian
Average
g-factor Resonance
Integral
14-MeV Fiss. Spec.
Average
total 3.818 (b) 4.292 (b) 1.124 4.995 (b) 5.701 (b)
elastic 3.543 (b) 4.001 (b) 1.129 3.234 (b) 4.921 (b)
inelastic ( E-thr = 105.0 keV ) 209.1 (mb) 774.7 (mb)
(n,2n) ( E-thr = 8.339 MeV ) 1.549 (b) 2.305 (mb)
(n,3n) ( E-thr = 15.22 MeV ) 1.050 (μb)
(n,na) ( E-thr = 3.107 MeV ) 3.026 (μb) 1.759 (nb)
(n,2na) ( E-thr = 11.43 MeV ) 8.475e-30 (b) 1.052e-15 (b)
(n,np) ( E-thr = 7.464 MeV ) 202.4 (μb) 74.56 (nb)
(n,n2a) ( E-thr = 6.818 MeV ) 5.336e-36 (b) 13.71e-27 (b)
(n,2n2a) ( E-thr = 14.97 MeV ) 0.000 (b)
(n,nd) ( E-thr = 13.36 MeV ) 598.8e-24 (b) 15.73e-12 (b)
(n,nt) ( E-thr = 13.47 MeV ) 12.91e-21 (b) 2.191e-12 (b)
(n,n He-3) ( E-thr = 17.53 MeV ) 120.5e-36 (b)
(n,n He-3) ( E-thr = 15.60 MeV ) 5.090e-12 (b)
(n,4n) ( E-thr = 17.46 MeV ) 934.7e-36 (b)
(n,3nfiss) ( E-thr = 11.16 MeV ) 0.000 (b) 31.61e-24 (b)
capture 270.1 (mb) 270.3 (mb) 1.001 354.4 (mb) 1.160 (mb) 1.818 (mb)
(n,p) ( E-thr = 3.409 MeV ) 1.033 (mb) 268.5 (nb)
(n,d) ( E-thr = 5.223 MeV ) 245.9 (μb) 52.39 (nb)
(n,t) ( E-thr = 7.059 MeV ) 1.234 (μb) 1.623 (nb)
(n,He-3) ( E-thr = 9.687 MeV ) 8.058e-18 (b) 1.809e-15 (b)
(n,a) 1.694e-18 (b) 1.716e-18 (b) 1.013 5.999 (μb) 329.7 (μb) 293.8 (nb)
(n,2a) ( E-thr = 1.040 MeV ) 88.60e-21 (b) 153.4e-21 (b)
(n,2p) ( E-thr = 13.65 MeV ) 37.63e-30 (b) 34.70e-21 (b)
(n,pa) ( E-thr = 5.282 MeV ) 32.87e-18 (b) 250.3e-18 (b)
MT = 115 ( E-thr = 15.22 MeV ) 3.702e-24 (b)
MT = 116 ( E-thr = 16.76 MeV ) 11.85e-33 (b)
MT = 117 ( E-thr = 8.918 MeV ) 1.667e-30 (b) 271.8e-24 (b)

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)
 .