18-Ar-0

MT Reaction 0.0253-eV Maxwellian
Average
g-factor Resonance
Integral
14-MeV Fiss. Spec.
Average
1 (n,total) 1.310 (b) 1.395 (b) 1.065 2.282 (b) 2.982 (b)
2 (n,elastic) 652.7 (mb) 736.9 (mb) 1.129 784.9 (mb) 2.559 (b)
4 (n,inelastic) ( E-thr = 1.498 MeV ) 633.6 (mb) 421.0 (mb)
16 (n,2n) ( E-thr = 10.12 MeV ) 832.4 (mb) 302.9 (μb)
17 (n,3n) ( E-thr = 16.88 MeV ) 53.65 (nb)
22 (n,na) ( E-thr = 6.968 MeV ) 2.114 (mb) 1.704 (μb)
28 (n,np) ( E-thr = 12.84 MeV ) 6.610 (μb) 51.55 (nb)
102 (n,γ) 657.5 (mb) 657.8 (mb) 1.001 292.1 (mb) 345.1 (μb) 1.009 (mb)
103 (n,p) ( E-thr = 6.885 MeV ) 14.93 (mb) 19.44 (μb)
104 (n,d) ( E-thr = 10.56 MeV ) 1.941 (mb) 325.2 (nb)
105 (n,t) ( E-thr = 12.42 MeV ) 352.7 (nb) 1.729 (nb)
106 (n,He-3) ( E-thr = 15.41 MeV ) 294.5e-15 (b)
107 (n,a) ( E-thr = 2.548 MeV ) 11.04 (mb) 203.2 (μb)

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)
 .