39-Y-89

MT Reaction 0.0253-eV Maxwellian
Average
g-factor Resonance
Integral
14-MeV Fiss. Spec.
Average
1 (n,total) 9.035 (b) 10.03 (b) 1.110 4.336 (b) 5.653 (b)
2 (n,elastic) 7.757 (b) 8.753 (b) 1.128 2.725 (b) 5.036 (b)
4 (n,inelastic) ( E-thr = 919.4 keV ) 577.5 (mb) 608.3 (mb)
16 (n,2n) ( E-thr = 11.60 MeV ) 847.5 (mb) 133.5 (μb)
22 (n,na) ( E-thr = 8.049 MeV ) 1.018 (μb) 29.88 (nb)
28 (n,np) ( E-thr = 7.159 MeV ) 152.3 (mb) 88.26 (μb)
32 (n,nd) ( E-thr = 16.07 MeV ) 15.75e-12 (b)
102 (n,γ) 1.278 (b) 1.278 (b) 1.000 867.4 (mb) 1.058 (mb) 6.260 (mb)
103 (n,p) ( E-thr = 717.9 keV ) 25.93 (mb) 204.4 (μb)
104 (n,d) ( E-thr = 4.822 MeV ) 1.871 (mb) 445.9 (nb)
105 (n,t) ( E-thr = 9.811 MeV ) 610.0 (nb) 3.241 (nb)
106 (n,He-3) ( E-thr = 10.07 MeV ) 137.6e-15 (b) 6.034e-12 (b)
107 (n,a) 0.000 (b) 0.000 (b) 48.44 (μb) 4.482 (mb) 2.756 (μb)

These cross sections are calculated from JENDL-3.2 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).

MT is a number that defines a reaction type. For the relation between MT and reaction type, please see here or refer to the manual of ENDF formats.

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)
 .