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[en] With the advent of high technology in analyzing the Gamow-Teller (GT) excited states beyond the one nucleon emission threshold, the quenching of the GT strength to the Ikeda sum rule can be recovered by using the high-lying GT states. Moreover, in some nuclei, GT peaks that are stronger than any other peaks appear explicitly in the high-lying excited states. In the current study, we have addressed these high-lying GT (–) excited states within a framework of the deformed quasi-particle random-phase approximation (DQRPA). These high-lying GT (–) excited states are generated due to an increase in particle numbers around the Fermi surface due to an increase in the chemical potential owing to a certain deformation of the nuclei. On the contrary, among the GT(+) excited states, the low-lying ones were favored by an increase in the deformation. The main GT(+/–) transitions were also changed drastically by the deformation. A detailed mechanism leading to the changes in the GT transitions is discussed by studying the shell evolution and the consequent change in the particle numbers in the smearing region caused by the deformation in typical doublebeta-decay nuclei, 76Ge and 76Se.

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[en] The even-even ⁸⁰ Se isotope has been studied within theoretical Projected Shell Model framework. The yrast level arising from multi-quasi particle configuration has been well described. Also the back bending, band diagram and g-factor shows good agreement with the available experimental results

[en] Microscopic studies on the band structures of ^76,78Se and ⁸²Kr are performed. The method is based on the angular momentum and the particle number conserved Hartree-Fock-Bogoliubov approach. For the effective interaction slightly renormalized G-matrix which is derived from the Bonn OBEP is employed. Two quasiparticle excitations in the intrinsic configurations are shown to have crucial role in determining the γ-band moment of inertia in these nuclei. The observed features of the γ-band in ⁷⁶Se are well reproduced in our framework. The quality of our resulting wavefunctions are analyzed by calculating both one nucleon transfer spectroscopic amplitudes and the energy levels belonging to the several bands in the neighboring odd mass nuclei. The calculated quantities well reproduce the experimental data. (author)