Anharmonic double-(gamma) vibrations in nuclei and their description in the interacting boson model

摘要

Double-(gamma) vibrations in deformed nuclei are studied in the context of the interacting boson model with special reference to their anharmonic character. It is shown that large anharmonicities can be obtained with interactions that are (at least) of three-body nature between the bosons. As an example the (gamma) vibrations of the nucleus (sub 68)(sup 166)Er(sub 98) are studied in detail. (author) 28 refs.