70-Yb-171

Reaction 0.0253-eV Maxwellian
Average
g-factor Resonance
Integral
14-MeV Fiss. Spec.
Average
(n,total) 74.82 (b) 76.85 (b) 1.027 5.297 (b) 7.053 (b)
(n,elastic) 16.51 (b) 18.59 (b) 1.126 2.587 (b) 3.971 (b)
(n,inelastic) ( E-thr = 67.11 keV ) 533.4 (mb) 2.921 (b)
(n,2n) ( E-thr = 6.654 MeV ) 2.166 (b) 13.00 (mb)
(n,3n) ( E-thr = 15.17 MeV ) 2.997 (μb)
(n,na) 0.000 (b) 0.000 (b) 120.5 (nb) 250.0 (μb) 84.06 (nb)
(n,np) ( E-thr = 6.841 MeV ) 170.3 (μb) 74.74 (nb)
(n,nd) ( E-thr = 11.23 MeV ) 0.000 (b) 138.6e-12 (b)
(n,γ) 58.31 (b) 58.26 (b) 0.999 326.6 (b) 819.6 (μb) 147.5 (mb)
(n,p) 0.000 (b) 0.000 (b) 202.1 (μb) 10.04 (mb) 10.09 (μb)
(n,d) ( E-thr = 4.603 MeV ) 1.653 (mb) 357.8 (nb)
(n,t) ( E-thr = 4.940 MeV ) 74.85 (μb) 23.04 (nb)
(n,He-3) ( E-thr = 5.274 MeV ) 0.000 (b) 1.144e-12 (b)
(n,a) 0.000 (b) 0.000 (b) 161.0 (μb) 3.093 (mb) 14.72 (μb)
MT = 203 0.000 (b) 0.000 (b) 202.1 (μb) 10.21 (mb) 10.16 (μb)
MT = 204 ( E-thr = 4.603 MeV ) 1.653 (mb) 357.9 (nb)
MT = 205 ( E-thr = 4.940 MeV ) 74.85 (μb) 23.04 (nb)
MT = 206 ( E-thr = 5.274 MeV ) 0.000 (b) 1.144e-12 (b)
MT = 207 0.000 (b) 0.000 (b) 161.2 (μb) 3.343 (mb) 14.80 (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)
 .