20-Ca-48

MT Reaction 0.0253-eV Maxwellian
Average
g-factor Resonance
Integral
14-MeV Fiss. Spec.
Average
1 (n,total) 4.849 (b) 5.332 (b) 1.099 2.613 (b) 3.622 (b)
2 (n,elastic) 3.756 (b) 4.239 (b) 1.128 1.511 (b) 3.530 (b)
4 (n,inelastic) ( E-thr = 3.912 MeV ) 347.9 (mb) 90.98 (mb)
16 (n,2n) ( E-thr = 10.16 MeV ) 752.7 (mb) 275.9 (μb)
17 (n,3n) ( E-thr = 17.59 MeV ) 17.14 (nb)
28 (n,np) ( E-thr = 16.14 MeV ) 317.9e-12 (b)
102 (n,γ) 1.093 (b) 1.093 (b) 1.000 484.3 (mb) 1.786 (μb) 190.1 (μb)
103 (n,p) ( E-thr = 11.55 MeV ) 1.670 (mb) 420.8 (nb)
107 (n,a) ( E-thr = 9.035 MeV ) 0.000 (b) 3.195 (nb)

These cross sections are calculated from JENDL-3.3 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)
 .