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HK: Fachverband Physik der Hadronen und Kerne

HK 60: Structure and Dynamics of Nuclei XI

HK 60.1: Gruppenbericht

Freitag, 3. April 2020, 11:00–11:30, J-HS H

Accepting the breaking of axial symmetry for all heavy nuclei improves the consistency of nuclear modelling — •Eckart Grosse¹, Arnd R. Junghans², Ralph Massarczyk³, and Jon N. Wilson⁴ — ¹IKTP, TU Dresden — ²IRP, Helmholtz-Zentrum Dresden-Rossendorf, 01314 Dresden — ³LANL, New Mexico 87545, USA — ⁴IPN and CNRS/IN2P3, F-91406 Orsay, France

Although atomic hyperfine structure as well as most nuclear spectroscopy data do not deliver accurate information on nuclear axiality the ad-hoc assumption of symmetry about one axis found widespread use in nuclear models. 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. Detailed studies of the mass and charge dependence of the electric dipole strength in the range of and also outside of giant dipole resonances clearly indicate the need for accepting broken axial symmetry already for nuclei in the valley of stability. Allowing triaxiality for quasi all heavy nuclei helps to get rid of the need to introduce an arbitrary level density parameter ã to fit the accurate values observed in n-capture experiments. Using the value for ã as taken from nuclear matter studies allows to even extend such predictions to all spins when the yrast energies are no longer approximated as for an axial rigid rotor. Allowing a breaking of axial symmetry together with spin-independent moments of inertia (MI) a surprisingly simple parametrization is found without using VMI fitting and allowing symmetry breaking instead and hence predictions for compound nuclear reactions are improved.