Keywords: positron annihilation, o-Ps lifetimes, semi-empirical model, pore size, estimation, nuclear energy, nuclear power
Semi-empirical formula for large pore-size estimation from the o-Ps annihilation lifetime
The o-Ps annihilation rate in large pores was investigated by the semi-classical approach. A semi-empirical model that simply correlates between the pore size and the o-Ps lifetime was proposed. The calculated results agree well with experimental data in the range from a few angstroms (A) to several tens of nanometres of the pore size.