Mainz 2022 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 50: Structure and Dynamics of Nuclei VIII

HK 50.3: Talk

Wednesday, March 30, 2022, 16:45–17:00, HK-H6

Observational indications for broken axial symmetry in heavy nuclei — •Eckart Grosse¹ and Arnd R. Junghans² — ¹IKTP Technische Universität Dresden — ²Helmholtz-Zentrum Dresden-Rossendorf

Following the observation of quadrupole moments in atomic hyperfine structure it became a custom to consider most nuclei as axially symmetric; this assumption is still in wide use, albeit it was falsified in several cases. Giving up axiality the apparent shapes in very many giant dipole resonances agree much better to data [EPJA 53, 225 (2017)] and we started to examine other experimental observations with respect on their sensitivity to axiality. Here we had to acknowledge that the popular I(I+1)-rule for rotational energy is strictly connected to axial symmetry. This changes the interpretation of ground state bands e.g. in actinide nuclei. The widely known R42 values (ratios of low level excitation energies) very surprisingly correlate to gamma-triaxialities derived in HFB-calculations modified by a generator coordinate approximation. And these values together with the backshift between experimental and Thomas-Fermi ground state masses allow satisfactory predictions of neutron resonance spacings in quasi all heavy nuclei. As also average widths of such resonances are predicted quite well we consider our findings a falsification of assuming axiality and point out that recent calculations of MC-shell model type [PRC 97, 014315 (2018)] support this statement.