97-Bk-247

MT Reaction 0.0253-eV Maxwellian
Average		 g-factor Resonance
Integral		 14-MeV Fiss. Spec.
Average
1 (n,total) 1.014 (kb) 1.018 (kb) 1.003 − 5.967 (b) 8.291 (b)
2 (n,elastic) 10.12 (b) 11.43 (b) 1.129 − 2.780 (b) 4.699 (b)
4 (n,inelastic) ( E-thr = 30.02 keV ) 372.5 (mb) 2.520 (b)
16 (n,2n) ( E-thr = 6.576 MeV ) 356.8 (mb) 4.024 (mb)
17 (n,3n) ( E-thr = 12.52 MeV ) 13.45 (mb) 2.161 (μb)
18 (n,fission) 3.702 (b) 3.706 (b) 1.001 4.971 (b) 2.442 (b) 888.9 (mb)
19 (n,f) 3.702 (b) 3.706 (b) 1.001 4.757 (b) 1.649 (b) 879.8 (mb)
20 (n,nf) ( E-thr = 2.300 MeV ) 788.1 (mb) 9.106 (mb)
21 (n,2nf) ( E-thr = 9.500 MeV ) 1.902 (mb) 820.5 (nb)
37 (n,4n) ( E-thr = 19.52 MeV ) − 9.277e-24 (b)
38 (n,3nf) ( E-thr = 15.00 MeV ) − 24.74e-12 (b)
102 (n,γ) 1.000 (kb) 1.001 (kb) 1.001 837.1 (b) 998.9 (μb) 175.7 (mb)
 
456 νp 3.503 −−− 6.331 −
455 νd 4.198e-3 −−− 2.903e-3 −

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)
  .
νp, νd : numbers of prompt and delayed neutrons per fission.