München 2019 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 49: Structure and Dynamics of Nuclei IX

HK 49.1: Group Report

Thursday, March 21, 2019, 14:00–14:30, HS 14

Consequences of broken axial symmetry in heavy nuclei - observed for surprisingly many spectroscopic features in the valley of stability — •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 — ⁴INP and CNRS/IN2P3, F-91406 Orsay, France

When about 80 years ago the hyperfine structure observed in atomic spectra suggested the concept of nuclear deformation no experimental information on nuclear axiality was available. This lead to the ad-hoc assumption of symmetry about one axis and as this concept results in large advantages for theoretical concepts and calculations it became widely used for heavy nuclei and triaxiality was considered - if at all - only for a few nuclides, like in studies for odd nuclei [e.g. Toki and Faessler, Nucl. Phys. A253 (1975) 231 ], on e-m transitions to nonyrast levels [e.g. Casten et al., PRC 60 (1999) 021304] and regarding the splitting of magnetic strength [Palumbo and Richter, PLB 158 (1985) 101]. But more recent work on dipole strength in the IVGDR [Junghans et al.,J.Kor.PhSoc 59 (2011) 1872; Grosse et al., EPJA53 (2017) 225] and of low spin level densities [Grosse et al., PLB739 (2014) 1] showed triaxiality as being non-negligible for more or less all heavy nuclei. Present studies extending such predictions to all spins without using VMI fits for the yrast sequences indicate a surprising result for many heavy nuclei: Allowing a breaking of axial symmetry leads to their reasonable description with spin-independent moments of inertia.