39-Y-0

Reaction 0.0253-eV Maxwellian
Average
g-factor Resonance
Integral
14-MeV Fiss. Spec.
Average
(n,total) 8.939 (b) 9.928 (b) 1.111 3.858 (b) 5.524 (b)
(n,elastic) 7.656 (b) 8.643 (b) 1.129 2.175 (b) 4.788 (b)
(n,inelastic) ( E-thr = 919.3 keV ) 760.6 (mb) 729.9 (mb)
(n,2n) ( E-thr = 11.60 MeV ) 834.5 (mb) 129.5 (μb)
(n,na) ( E-thr = 8.050 MeV ) 0.000 (b) 3.302 (nb)
(n,np) ( E-thr = 7.149 MeV ) 55.58 (mb) 46.83 (μb)
(n,nd) ( E-thr = 16.14 MeV ) 6.565e-12 (b)
(n,γ) 1.284 (b) 1.284 (b) 1.000 862.6 (mb) 917.7 (μb) 4.871 (mb)
(n,p) ( E-thr = 718.3 keV ) 21.80 (mb) 249.2 (μb)
(n,d) ( E-thr = 4.899 MeV ) 932.7 (μb) 304.0 (nb)
(n,t) ( E-thr = 9.810 MeV ) 332.3 (nb) 867.5e-12 (b)
(n,He-3) ( E-thr = 10.08 MeV ) 0.000 (b) 233.7e-15 (b)
(n,a) 0.000 (b) 0.000 (b) 52.44 (μb) 5.313 (mb) 3.147 (μb)
MT = 203 ( E-thr = 718.3 keV ) 77.38 (mb) 296.0 (μb)
MT = 204 ( E-thr = 4.899 MeV ) 932.7 (μb) 304.0 (nb)
MT = 205 ( E-thr = 9.810 MeV ) 332.3 (nb) 867.5e-12 (b)
MT = 206 ( E-thr = 10.08 MeV ) 0.000 (b) 233.7e-15 (b)
MT = 207 0.000 (b) 0.000 (b) 52.44 (μb) 5.313 (mb) 3.150 (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)
 .