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HK: Fachverband Physik der Hadronen und Kerne

HK 19: Structure and Dynamics of Nuclei V

HK 19.3: Talk

Tuesday, March 12, 2024, 16:30–16:45, HBR 19: C 5b

Shape Coexistence Near Doubly-Magic ⁷⁸Ni — •Lukas Nies for the ISOLTRAP and JYFLTRAP collaboration — CERN, 1211 Geneva, Switzerland — Universität Greifswald, Germany

Nuclear magic numbers are associated with sudden changes in nuclear observables between neighboring isotopes, such as binding energies, charge radii, transition strengths, etc. Furthermore, shape coexistence is often found in nuclei where intruder states across shell gaps lead to a large amount of deformation [1], indicating nearby magicity. Indication for shape coexistence in ⁷⁹Zn with N=49 and Z=30 has previously been found through laser spectroscopy experiments [2] and in ⁸⁰Ga with N=49 and Z=31 through electron-conversion spectroscopy [3]. The latter, however, was disproven in a follow-up experiment [4]. In this contribution, we present further evidence for shape coexistence in ⁷⁹Zn through the first direct excitation energy measurements of the 1/2⁺ isomeric state, firmly establishing the 1/2⁺ and 5/2⁺ state ordering [5]. Using discrete nonorthogonal shell model calculations, we find low-lying deformed intruder states, similar to other N=49 isotones, and investigate similarities in shapes between excited states in ^79,80Zn and ⁷⁸Ni. [1] Garrett, Zielińska, and Clement, Prog. Part. Nucl. Phys. 124, 103931 (2022) [2] Yang et al., PRL 116, 182502 (2016) [3] Gottardo et al., PRL 116, 182501 (2016) [4] Garcia et al., PRL 125, 172501 (2020) [5] Nies et al., PRL 131, 222503 (2023)

Keywords: Nuclear Structure; Shape Coexistence; High-precision mass spectrometry; Large Scale Shell Model; Radioactive ion beams