4-Be-9

Reaction 0.0253-eV Maxwellian
Average
g-factor Resonance
Integral
14-MeV Fiss. Spec.
Average
total 6.511 (b) 7.340 (b) 1.127 1.495 (b) 2.833 (b)
elastic 6.503 (b) 7.331 (b) 1.127 983.9 (mb) 2.677 (b)
(n,2n) ( E-thr = 1.749 MeV ) 483.8 (mb) 119.6 (mb)
capture 8.490 (mb) 8.495 (mb) 1.001 3.822 (mb) 361.3 (nb) 1.292 (μb)
(n,p) ( E-thr = 14.26 MeV ) 20.25 (nb)
(n,d) ( E-thr = 16.30 MeV ) 32.68 (nb)
(n,t) ( E-thr = 11.61 MeV ) 17.34 (mb) 3.084 (μb)
(n,a) ( E-thr = 669.7 keV ) 9.419 (mb) 35.65 (mb)
MT = 600 ( E-thr = 14.26 MeV ) 20.25 (nb)
MT = 650 ( E-thr = 16.30 MeV ) 32.68 (nb)
MT = 700 ( E-thr = 11.61 MeV ) 13.28 (mb) 2.128 (μb)
MT = 701 ( E-thr = 12.14 MeV ) 4.060 (mb) 956.4 (nb)
MT = 800 ( E-thr = 669.7 keV ) 9.419 (mb) 35.65 (mb)

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)
 .