ββ decay of 104Ru and multipole giant resonances in ββ-Decaying nuclei.

This work presents results of quasiparticle random-phase approximation (QRPA) calculations of multipole giant res-onances and microscopic interacting boson model (IBM-2) calculations of the double-beta (ββ) decay of 104Ru. The QRPA calculations were done to study spin-multipole giant resonances in ββ-decay parent and daughter nuclei, and multipole resonances (without the spin contribution) in zirconium and molybdenum isotopes. The other task of this study was to calculate nuclear matrix elements and phase-space factors for the double-beta decay of 104Ru. Preliminary estimates were also provided for the half-lives of two-neutrino and neutrinoless ββ decay. [ABSTRACT FROM AUTHOR]