SMuK 2023 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 71: Structure and Dynamics of Nuclei XVI

HK 71.1: Gruppenbericht

Donnerstag, 23. März 2023, 15:45–16:15, SCH/A117

Broken axial symmetry as essential feature for a consistent modelling of various observables in heavy nuclei — •Eckart Grosse¹ and Arnd R. Junghans² — ¹IKTP, Techn. Universität Dresden — ²Helmholtz-Zentrum Dresden-Rossendorf, 01314 Dresden

Although most experimental data do not deliver accurate information on nuclear axiality the ad-hoc assumption of symmetry about one axis found widespread use in nuclear model calculations. In the theoretical interpretation of nuclear properties as well as in the analysis of experimental data triaxiality was considered - if at all - only for some, often exotic, nuclides. Allowing breaking of axial symmetry combined to a spin-independent moment of inertia results in a surprisingly simple heuristic triaxial parametrization of the yrast sequence in all heavy nuclei, including well deformed ones. No additional fit parameters are needed in detailed studies of the mass and charge dependence of the electric dipole strength in the range of and outside of giant dipole resonances. Allowing triaxiality also avoids the introduction of an arbitrary level density parameter ã to fit the accurate values observed in n-capture experiments. Predictions for radiative neutron capture yields as derived on the basis of non-axiality are improved as well. The broken axial symmetry experimentally favoured apparently is in accord to HFB and MC-shell model calculations already for nuclei in the valley of stability.