Atom Density Formula
The Atom density is the number of atoms of a given type per unit volume of the material.
To calculate the atom density of a substance use these equation
N=pNa/M = atom/cm^3
where :
N = Atom density (atom/cm^3)
p = density (g/cm^3)
Na = Avogadro's Number (6.022 10^23 atoms/mole)
M = Gram atomic weight
Slowing Down the Fast Neutron
taverage=tpromt (1-B) + tdelayed (B)
B = Fraction of delayed neutron