70-Yb-173

Reaction 0.0253-eV Maxwellian
Average
g-factor Resonance
Integral
14-MeV Fiss. Spec.
Average
(n,total) 29.83 (b) 31.69 (b) 1.062 5.326 (b) 6.970 (b)
(n,elastic) 14.33 (b) 16.17 (b) 1.129 2.690 (b) 4.115 (b)
(n,inelastic) ( E-thr = 79.11 keV ) 430.2 (mb) 2.769 (b)
(n,2n) ( E-thr = 6.404 MeV ) 2.197 (b) 15.73 (mb)
(n,3n) ( E-thr = 14.47 MeV ) 5.411 (μb)
(n,na) 0.000 (b) 0.000 (b) 0.000 (b) 83.07 (μb) 26.23 (nb)
(n,np) ( E-thr = 7.509 MeV ) 31.98 (μb) 29.05 (nb)
(n,nd) ( E-thr = 11.54 MeV ) 0.000 (b) 121.2e-12 (b)
(n,γ) 15.50 (b) 15.52 (b) 1.001 384.6 (b) 758.6 (μb) 70.50 (mb)
(n,p) ( E-thr = 518.1 keV ) 5.147 (mb) 2.467 (μb)
(n,d) ( E-thr = 5.271 MeV ) 1.025 (mb) 248.4 (nb)
(n,t) ( E-thr = 5.250 MeV ) 126.0 (μb) 35.92 (nb)
(n,He-3) ( E-thr = 6.730 MeV ) 0.000 (b) 130.1e-15 (b)
(n,a) 0.000 (b) 0.000 (b) 37.47 (μb) 1.968 (mb) 2.451 (μb)
MT = 203 ( E-thr = 518.1 keV ) 5.179 (mb) 2.496 (μb)
MT = 204 ( E-thr = 5.271 MeV ) 1.025 (mb) 248.5 (nb)
MT = 205 ( E-thr = 5.250 MeV ) 126.0 (μb) 35.92 (nb)
MT = 206 ( E-thr = 6.730 MeV ) 0.000 (b) 130.1e-15 (b)
MT = 207 0.000 (b) 0.000 (b) 37.47 (μb) 2.051 (mb) 2.477 (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)
 .