20-Ca-48

Reaction 0.0253-eV Maxwellian
Average
g-factor Resonance
Integral
14-MeV Fiss. Spec.
Average
total 4.849 (b) 5.335 (b) 1.100 2.150 (b) 3.209 (b)
elastic 3.756 (b) 4.241 (b) 1.129 938.4 (mb) 3.130 (b)
inelastic ( E-thr = 3.912 MeV ) 471.0 (mb) 78.76 (mb)
(n,2n) ( E-thr = 10.15 MeV ) 738.4 (mb) 284.9 (μb)
(n,3n) ( E-thr = 17.58 MeV ) 13.00 (nb)
(n,na) ( E-thr = 14.26 MeV ) 17.72e-12 (b)
(n,np) ( E-thr = 16.14 MeV ) 287.6e-12 (b)
capture 1.093 (b) 1.094 (b) 1.001 484.5 (mb) 167.8 (μb) 146.2 (μb)
(n,p) ( E-thr = 11.55 MeV ) 15.99 (μb) 17.29 (nb)
(n,a) ( E-thr = 8.982 MeV ) 15.02 (μb) 3.050 (nb)
MT = 600 ( E-thr = 11.55 MeV ) 7.657 (μb) 913.5e-12 (b)
MT = 649 ( E-thr = 11.55 MeV ) 8.333 (μb) 16.38 (nb)
MT = 800 ( E-thr = 8.982 MeV ) 15.02 (μb) 2.138 (nb)
MT = 849 ( E-thr = 10.81 MeV ) 0.000 (b) 912.3e-12 (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)
 .