61-Pm-149

Reaction 0.0253-eV Maxwellian
Average
g-factor Resonance
Integral
14-MeV Fiss. Spec.
Average
(n,total) 1.407 (kb) 1.411 (kb) 1.003 5.105 (b) 6.340 (b)
(n,elastic) 5.820 (b) 6.572 (b) 1.129 2.765 (b) 3.966 (b)
(n,inelastic) ( E-thr = 105.0 keV ) 291.4 (mb) 2.327 (b)
(n,2n) ( E-thr = 7.320 MeV ) 2.025 (b) 7.553 (mb)
(n,3n) ( E-thr = 13.26 MeV ) 14.32 (mb) 14.90 (μb)
(n,na) 0.000 (b) 0.000 (b) 14.20 (μb) 435.1 (μb) 628.7 (nb)
(n,2na) ( E-thr = 5.851 MeV ) 429.7 (nb) 170.9e-12 (b)
(n,np) ( E-thr = 5.987 MeV ) 806.6 (μb) 215.1 (nb)
(n,nd) ( E-thr = 11.13 MeV ) 120.9e-12 (b) 595.9e-12 (b)
(n,nt) ( E-thr = 10.16 MeV ) 501.2e-12 (b) 183.7e-12 (b)
(n,n He-3) ( E-thr = 13.37 MeV ) 141.4e-21 (b) 191.5e-12 (b)
(n,γ) 1.401 (kb) 1.401 (kb) 1.001 1.203 (kb) 780.3 (μb) 40.00 (mb)
(n,p) ( E-thr = 914.2 keV ) 5.628 (mb) 2.551 (μb)
(n,d) ( E-thr = 3.747 MeV ) 1.238 (mb) 273.2 (nb)
(n,t) ( E-thr = 4.830 MeV ) 43.94 (μb) 10.74 (nb)
(n,He-3) ( E-thr = 7.527 MeV ) 4.539e-15 (b) 34.68e-15 (b)
(n,a) 128.8 (μb) 128.9 (μb) 1.001 142.8 (μb) 1.322 (mb) 4.206 (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)
 .