97-Bk-250

MT Reaction 0.0253-eV Maxwellian
Average
g-factor Resonance
Integral
14-MeV Fiss. Spec.
Average
1 (n,total) 1.324 (kb) 1.253 (kb) 0.946 5.827 (b) 8.110 (b)
2 (n,elastic) 12.25 (b) 13.51 (b) 1.103 2.751 (b) 4.792 (b)
4 (n,inelastic) ( E-thr = 34.14 keV ) 9.955 (mb) 1.216 (b)
16 (n,2n) ( E-thr = 4.990 MeV ) 300.9 (mb) 26.57 (mb)
17 (n,3n) ( E-thr = 11.23 MeV ) 682.5 (mb) 108.2 (μb)
18 (n,fission) 958.9 (b) 905.5 (b) 0.944 514.8 (b) 2.083 (b) 2.041 (b)
37 (n,4n) ( E-thr = 16.82 MeV ) 196.5 (nb)
102 (n,γ) 353.3 (b) 333.6 (b) 0.944 199.0 (b) 8.029 (nb) 31.05 (mb)

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)
 .