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HK: Hadronen und Kerne

HK 7: Nuclear Moments

HK 7.5: Talk

Monday, March 16, 1998, 15:15–15:30, E

Extension of the LEMS method to cubic and magnetic host materials — •S. Ternier¹, G. Neyens¹, K. Vyvey¹, N. Coulier¹, S. Teughels¹, G. Georgiev¹, C. L’abbé¹, R. Coussement¹, D.L. Balabanski¹, A. Lépine-Szily², and N. Medina² — ¹Instituut voor Kern- en Stralingsfysica, University of Leuven, Celestijnenlaan 200 D, B-3001 Leuven, Belgium — ²Institute of Physics, University of São Paulo, C.P.66318, 05389-970, São Paulo, Brasil

The Level Mixing Spectroscopy Method is a very powerful method to measure quadrupole moments of high spin isomers. The quadrupole moments are measured by decoupling the nuclear quadrupole interaction using a strong external magnetic field. The electric field gradient is normally provided by implanting the nucleus in a non cubic material. We have proven that it is also possible to implant in cubic host materials and use the defect associated electric field gradients. In a second step we are using magnetic host materials. The magnetic hyperfine fields can be orders of magnitude larger than the fields from the magnet, currently used in the experimental set-up. To control the temperature (and thus the hyperfine field) of a material, only a small device is needed. This way, we can compactify the LEMS set-up. Using these techniques, we hope to be able in the future to implement the method in multi-detector systems. An experiment has recently been performed using Gadolinium as a host material and preliminary results indicate that it is possible to perform LEMS measurements using magnetic materials.