Theoretical study of rotational and multi-phonon γ-vibrational structure in neutron-rich Zr, Mo, and Ru nuclei

A theoretical study for some neutron-rich nuclei in the A = 100-110 mass region is carried out by using the angular-momentum-projection technique implemented in the projected shell model. By assuming an axial symmetry in the deformed basis, the influence of the high-j h_11/2 neutron orbital and the g_9/2 proton orbital on the structure of strongly-deformed, neutron-rich even-even and odd-mass Zr isotopes is investigated. For even-even isotopes, the structure of multi-quasiparticle bands in ¹⁰²Zr is taken as an example and properties along the yrast line are analyzed in detail. For odd-neutron isotopes, the discussion is focused on the excited single-particle configurations. We also perform calculations by employing a triaxially-deformed basis to study multi-phonon γ vibrational bands in ¹¹⁰Mo and to interpret the anharmonicity observed in the one- and two-phonon γ vibrational bands in ¹¹⁴Ru.