93-Np-236

Reaction 0.0253-eV Maxwellian
Average
g-factor Resonance
Integral
14-MeV Fiss. Spec.
Average
total 2.939 (kb) 3.003 (kb) 1.022 5.894 (b) 7.841 (b)
elastic 9.657 (b) 10.94 (b) 1.133 2.871 (b) 4.469 (b)
inelastic ( E-thr = 56.24 keV ) 302.5 (mb) 1.207 (b)
(n,2n) ( E-thr = 5.761 MeV ) 254.5 (mb) 3.146 (mb)
(n,3n) ( E-thr = 12.77 MeV ) 284.6 (μb) 403.0 (nb)
fission 2.808 (kb) 2.863 (kb) 1.020 1.173 (kb) 2.464 (b) 2.096 (b)
(n,fission) 2.808 (kb) 2.863 (kb) 1.020 1.172 (kb) 1.445 (b) 2.083 (b)
(n,n,fiss) ( E-thr = 2.000 MeV ) 924.9 (mb) 12.42 (mb)
(n,2n,fiss) ( E-thr = 8.000 MeV ) 94.74 (mb) 13.84 (μb)
(n,4n) ( E-thr = 18.86 MeV ) 154.0e-15 (b)
(n,3nfiss) ( E-thr = 16.00 MeV ) 14.63e-12 (b)
capture 121.3 (b) 129.2 (b) 1.066 100.3 (b) 1.008 (mb) 64.84 (mb)
 
νp 2.400 4.386
νd 7.040e-3 6.076e-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).

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.