Bulg. J. Phys. vol.46 no.4 (2019), pp. 366-377

K-Isomeric States in Heavy, Well-Deformed Nuclei within a Skyrme?Hartree?Fock?BCS Approach

L. Bonneau1,2, P. Quentin1,2, N. Minkov3, D. Ivanova4, J. Bartel5, H. Molique5, Meng Hock Koh6,7
1Univ. Bordeaux, CENBG, UMR5797, 33170 Gradignan, France
2CNRS, IN2P3, CENBG, UMR5797, 33170 Gradignan, France
3Institute of Nuclear Research and Nuclear Energy, Bulgarian Academy of Sciences, Sofia, Bulgaria
4Military Medical Academy; UMHAT "Saint Ekaterina", Sofia, Bulgaria
5IPHC, UMR 7178, Université de Strasbourg, CNRS-IN2P3, Strasbourg, France
6Department of Physics, Faculty of Sciences, UTM, Johor Bahru, Malaysia
7UTM Center for Industrial and Applied Mathematics, UTM, Johor Bahru, Malaysia
Abstract. In this work we report on recent microscopic calculations of K-isomeric states of two-quasiparticle character in well-deformed rare-earth nuclei and actinide nuclei. In these calculations we employ a Skyrme energy-density functional together with a seniority residual interaction in the Hartree-Fock-BCS approximation with selfconsistent blocking (SCB). The strength of the seniority interaction is calibrated in a consistent way: as some of us showed in Ref. [1] for rare-earth nuclei, the same strength can be obtained in a fit on moments of inertia of even-even nuclei and in a fit on odd-even mass staggering. The former fitting protocol is used for the actinide nuclei studied here. Once the seniority force was adjusted we calculated properties of various K-isomeric states without additional parameters. Overall we have obtained a rather good agreement with available data around 154Nd and in the 234U ? 236Pu region. We also found that an octupole deformation lowers the excitation energy of the Kπ = 6- isomer in 234U.

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