The properties of collective states of even-even deformed nuclei of rare earth range 156<A<172

Aims of inquiry: development of phenomenological model, based on mixing of rotational bands, description of non-adiabatic properties of energy and electromagnetic characteristics of excited states of nuclei for isotopes 156-164Dy and 172Yb as example. Method of inquiry: phenomenological and microscopical model of deformed nuclei based on mixing rotational bands. The results achieved and their novelty: 1. phenomenological model that accounts for coriolis mixing of ground (gr), β-, γ- and 1+ bands. 2. It is shown that the involvement of 1+components in wave functions of vibrational states causes M1 transitions. Experimentally observed K-forbidden monopole electric and dipole magnetic transitions from levels of Kπ=2n+-bands to those of ground bands are explained. 3. On the basic of microscopic analysis it is shown that in the 'scissors' mode region Coriolis coupling between the ground and 1+ states is equal to zero. This effect is most interesting and unexpected. (author)