20-Ca-46

MT Reaction 0.0253-eV Maxwellian
Average
g-factor Resonance
Integral
14-MeV Fiss. Spec.
Average
1 (n,total) 3.685 (b) 4.064 (b) 1.103 2.527 (b) 3.933 (b)
2 (n,elastic) 2.933 (b) 3.311 (b) 1.129 1.241 (b) 3.486 (b)
4 (n,inelastic) ( E-thr = 1.376 MeV ) 418.8 (mb) 446.4 (mb)
16 (n,2n) ( E-thr = 10.63 MeV ) 856.6 (mb) 223.2 (μb)
17 (n,3n) ( E-thr = 18.21 MeV ) 5.233 (nb)
22 (n,na) ( E-thr = 11.39 MeV ) 8.923 (nb) 3.515 (nb)
28 (n,np) ( E-thr = 14.12 MeV ) 18.31 (nb)
102 (n,γ) 740.0 (mb) 740.3 (mb) 1.000 339.1 (mb) 896.2 (nb) 172.2 (μb)
103 (n,p) ( E-thr = 7.088 MeV ) 6.600 (mb) 2.525 (μb)
107 (n,a) ( E-thr = 5.632 MeV ) 4.000 (mb) 66.88 (μb)

These cross sections are calculated from JENDL-3.2 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)
 .