70-Yb-172

Reaction 0.0253-eV Maxwellian
Average
g-factor Resonance
Integral
14-MeV Fiss. Spec.
Average
(n,total) 12.80 (b) 14.28 (b) 1.116 5.311 (b) 6.940 (b)
(n,elastic) 11.49 (b) 12.97 (b) 1.129 2.590 (b) 4.217 (b)
(n,inelastic) ( E-thr = 79.20 keV ) 595.4 (mb) 2.653 (b)
(n,2n) ( E-thr = 8.067 MeV ) 2.121 (b) 4.621 (mb)
(n,3n) ( E-thr = 14.72 MeV ) 3.865 (μb)
(n,na) 0.000 (b) 0.000 (b) 12.18 (nb) 89.07 (μb) 28.97 (nb)
(n,np) ( E-thr = 7.377 MeV ) 57.57 (μb) 38.63 (nb)
(n,nd) ( E-thr = 12.67 MeV ) 0.000 (b) 12.06e-12 (b)
(n,γ) 1.313 (b) 1.314 (b) 1.001 27.16 (b) 784.3 (μb) 65.22 (mb)
(n,p) ( E-thr = 1.104 MeV ) 6.143 (mb) 2.986 (μb)
(n,d) ( E-thr = 5.139 MeV ) 642.0 (μb) 161.2 (nb)
(n,t) ( E-thr = 6.375 MeV ) 13.03 (μb) 7.967 (nb)
(n,He-3) ( E-thr = 6.041 MeV ) 0.000 (b) 111.6e-15 (b)
(n,a) 0.000 (b) 0.000 (b) 20.11 (μb) 977.2 (μb) 1.453 (μb)
MT = 203 ( E-thr = 1.104 MeV ) 6.201 (mb) 3.025 (μb)
MT = 204 ( E-thr = 5.139 MeV ) 642.0 (μb) 161.2 (nb)
MT = 205 ( E-thr = 6.375 MeV ) 13.03 (μb) 7.967 (nb)
MT = 206 ( E-thr = 6.041 MeV ) 0.000 (b) 111.6e-15 (b)
MT = 207 0.000 (b) 0.000 (b) 20.12 (μb) 1.066 (mb) 1.482 (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)
 .