89-Ac-225

MT Reaction 0.0253-eV Maxwellian
Average
g-factor Resonance
Integral
14-MeV Fiss. Spec.
Average
1 (n,total) 52.72 (b) 54.45 (b) 1.033 5.807 (b) 7.575 (b)
2 (n,elastic) 12.63 (b) 14.26 (b) 1.129 2.782 (b) 4.460 (b)
4 (n,inelastic) ( E-thr = 30.07 keV ) 434.5 (mb) 2.905 (b)
16 (n,2n) ( E-thr = 6.698 MeV ) 2.315 (b) 14.50 (mb)
17 (n,3n) ( E-thr = 12.39 MeV ) 185.7 (mb) 37.68 (μb)
18 (n,fission) 500.3 (μb) 501.2 (μb) 1.002 138.5 (mb) 88.10 (mb) 34.54 (mb)
19 (n,f) 500.3 (μb) 501.2 (μb) 1.002 128.3 (mb) 48.85 (mb) 34.20 (mb)
20 (n,nf) ( E-thr = 3.000 MeV ) 38.95 (mb) 344.3 (μb)
21 (n,2nf) ( E-thr = 10.00 MeV ) 338.3 (μb) 665.9 (nb)
37 (n,4n) ( E-thr = 19.28 MeV ) 269.6e-15 (b)
38 (n,3nf) ( E-thr = 15.50 MeV ) 9.084e-12 (b)
102 (n,γ) 40.02 (b) 40.05 (b) 1.001 1.235 (kb) 1.215 (mb) 158.5 (mb)
 
456 νp 1.823 2.803
455 νd 1.115e-2 7.930e-3

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).

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)
 .


νp, νd : numbers of prompt and delayed neutrons per fission.