A statistical model for ESR line shape of lithium colloids created by γ irradiation in HLi

Electron paramagnetic resonance results of small lithium particles created in lithium hydride by γ irradiations are presented. The EPR line was found to be inhomogeneous and the spin lattice relaxation time for conduction electrons to be unusually large (10^?4?10^?6s). We point out that the EPR line width is induced by the dispersion of the total nuclear magnetic moment inside the small particle. We assume that the size distribution of lithium particles created by γ irradiation is a logarithmiconormal distribution. Different experimental results confirm this model.