Further Charge Collection Studies in Coaxial Ge(Li) Detectors

Calculations have shown that, for comparable trapping lifetimes, the effect of charge trapping in a coaxial detector is significantly less for the carriers which move radially outward from the core than for those which move inward, as a consequence of the non-uniform electric field. This has been verified by resolution measurements on two thin coaxial detectors made from the same hole-trapping crystal; one was made conventionally, by drifting lithium in from the outer surface, the other in an "inside out" configuration by drifting lithium outward from the surface of a central hole.