70-Yb-0

Reaction 0.0253-eV Maxwellian
Average
g-factor Resonance
Integral
14-MeV Fiss. Spec.
Average
(n,total) 58.31 (b) 61.46 (b) 1.054 5.317 (b) 6.890 (b)
(n,elastic) 23.41 (b) 26.40 (b) 1.128 2.613 (b) 4.127 (b)
(n,inelastic) ( E-thr = 67.11 keV ) 544.8 (mb) 2.686 (b)
(n,2n) ( E-thr = 6.404 MeV ) 2.145 (b) 9.544 (mb)
(n,3n) ( E-thr = 12.76 MeV ) 9.028 (mb) 8.556 (μb)
(n,na) 0.000 (b) 0.000 (b) 40.73 (nb) 100.9 (μb) 33.51 (nb)
(n,np) ( E-thr = 6.353 MeV ) 56.62 (μb) 33.64 (nb)
(n,nd) ( E-thr = 11.23 MeV ) 0.000 (b) 46.73e-12 (b)
(n,γ) 34.90 (b) 35.06 (b) 1.005 160.9 (b) 762.8 (μb) 66.83 (mb)
(n,p) 0.000 (b) 0.000 (b) 49.54 (μb) 5.103 (mb) 3.141 (μb)
(n,d) ( E-thr = 4.115 MeV ) 630.7 (μb) 153.7 (nb)
(n,t) ( E-thr = 4.940 MeV ) 38.77 (μb) 14.00 (nb)
(n,He-3) ( E-thr = 3.524 MeV ) 15.30e-15 (b) 273.9e-15 (b)
(n,a) 0.000 (b) 0.000 (b) 39.81 (μb) 1.205 (mb) 3.329 (μb)
MT = 203 0.000 (b) 0.000 (b) 49.54 (μb) 5.160 (mb) 3.174 (μb)
MT = 204 ( E-thr = 4.115 MeV ) 630.7 (μb) 153.7 (nb)
MT = 205 ( E-thr = 4.940 MeV ) 38.77 (μb) 14.00 (nb)
MT = 206 ( E-thr = 3.524 MeV ) 15.30e-15 (b) 273.9e-15 (b)
MT = 207 0.000 (b) 0.000 (b) 39.85 (μb) 1.306 (mb) 3.363 (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).

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)
 .