  The proton radioactivity lifetimes of spherical proton emitters from the
ground and the isomeric states are calculated using the microscopic
nucleon-nucleus interaction potentials. The daughter nuclei density
distributions are folded with a realistic density dependent M3Y effective
interaction supplemented by a zero-range pseudo-potential. The density
dependence parameters of the interaction are extracted from the nuclear matter
calculations. The saturation energy per nucleon used for nuclear matter
calculations is determined from the co-efficient of the volume term of
Bethe-Weizsacker mass formula which is evaluated by fitting the recent
experimental and estimated atomic mass excesses from Audi-Wapstra-Thibault
atomic mass table by minimizing the mean square deviation. The quantum
mechanical tunneling probability is calculated within the WKB approximation.
Spherical charge distributions are used for calculating the Coulomb interaction
potentials. These calculations provide good estimates for the observed proton
radioactivity lifetimes.
