Nuclear Instruments and Methods in Physics Research. Section B, Beam interactions with materials and atoms vol:140 issue:1-2 pages:235-242
Level Mixing Spectroscopy (LEMS) can be used to determine nuclear quadrupole moments. In this paper it is shown how LEMS can be applied to nuclei implanted in a cubic lattice. In this case the quadrupole interaction is due to electric field gradients produced by defects. The method has been illustrated by measuring quadrupole moments of Po202-204 isomers produced in Pt-nat(C-12, 4n) and Pt-nat(C-13, 5n) reactions, the (natural) Platinum serving as a host material. The result could be analysed with the assumption of two different defect associated sites, making up for about 80% of the total site population. The experimental ratio Q(Po-202,8(+))/Q(Po-204,8(+)) is in agreement with the systematics in the lead region. LEMS measurements in cubic crystals provide another nuclear method for the study of nuclear quantities or solid state parameters. (C) 1998 Elsevier Science B.V.