Bulg. J. Phys. vol.46 no.4 (2019), pp. 354-365

K-Levels in Axially Deformed Nuclei with Relativistic Hartree-Bogoliubov Theory

G.A. Lalazissis1, K.E. Karakatsanis1, V. Prassa2, P. Ring3
1Department of Physics, Aristotle University of Thessaloniki, Thessaloniki GR-54124, Greece
2Department of Computer Science, School of Sciences, University of Thessaly, Lamia GR-35100, Greece
3Department of Physics, Technical University of Munich, Garching D-85747, Germany
Abstract. Relativistic density functionals provide a powerful phenomenological way to study nuclear structure phenomena. They have been mostly used in describing bulk nuclear properties of ground states and have been also very successful in the description of collective excitations. Nuclear excitations that form due to the inherent structure of nuclei and have a relatively long half-life are called isomers. They play a significant role in recent experimental and theoretical studies of nuclei far from stability, in nuclear fission and in the process of nucleosynthesis relative to astrophysics. In this study we concentrate on the single particle excitations of high K-level isomers that appear mainly at nuclei with well defined axial deformation. We employ the blocking effect to create two quasiparticle states within the relativistic hartree-Bogoliubov framework. We use the Equal filling approximation that respects the time-reversal symmetry breaking caused by blocking. We concentrate our interest in medium mass axially deformed nuclei where there have been several experimentally observed K-level isomers and we can compare directly our results.

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