23-V-51

MT Reaction 0.0253-eV Maxwellian
Average
g-factor Resonance
Integral
14-MeV Fiss. Spec.
Average
1 (n,total) 9.887 (b) 10.53 (b) 1.065 2.403 (b) 3.929 (b)
2 (n,elastic) 4.968 (b) 5.609 (b) 1.129 1.116 (b) 3.230 (b)
4 (n,inelastic) ( E-thr = 105.0 keV ) 558.9 (mb) 695.7 (mb)
16 (n,2n) ( E-thr = 11.27 MeV ) 565.8 (mb) 100.0 (μb)
22 (n,na) ( E-thr = 10.50 MeV ) 552.9 (nb) 38.75 (nb)
28 (n,np) ( E-thr = 8.223 MeV ) 111.6 (mb) 74.76 (μb)
32 (n,nd) ( E-thr = 17.11 MeV ) 19.36e-12 (b)
102 (n,γ) 4.919 (b) 4.921 (b) 1.000 2.561 (b) 760.4 (μb) 2.497 (mb)
103 (n,p) ( E-thr = 1.725 MeV ) 29.05 (mb) 499.0 (μb)
104 (n,d) ( E-thr = 5.955 MeV ) 4.747 (mb) 1.510 (μb)
105 (n,t) ( E-thr = 10.73 MeV ) 109.0 (μb) 19.85 (nb)
106 (n,He-3) ( E-thr = 12.76 MeV ) 12.98e-12 (b) 2.387e-12 (b)
107 (n,a) ( E-thr = 2.100 MeV ) 15.60 (mb) 24.27 (μb)
111 (n,2p) ( E-thr = 14.45 MeV ) 790.4e-15 (b)
112 (n,pa) ( E-thr = 11.73 MeV ) 1.176e-15 (b) 1.389e-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).

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)
 .