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HK: Fachverband Physik der Hadronen und Kerne
HK 49: Structure and Dynamics of Nuclei IX
HK 49.4: Talk
Wednesday, March 22, 2023, 18:15–18:30, SCH/A118
Gamma-ray spectroscopy of neutron-rich 55,57,59Sc isotopes — •Radostina Zidarova1, Martha Liliana Cortés2, Volker Werner1, Pavlos Koseoglou1, Norbert Pietralla1, Pieter Doornenbal2, and Alexandre Obertelli1 — 1TU Darmstadt, Germany — 2RIKEN-RIBF, Japan
Experimental data have shown that far from the valley of stability new magic numbers can emerge and the traditional ones can disappear. In particular, two new magic numbers at N=32 and N=34 have been suggested in the vicinity of Z=20 based on gamma-ray spectroscopy and mass measurements. In order to assess the impact of a single valence proton outside of the Z=20 shell on the shell-evolution mechanism in this region, it is necessary to study the neutron-rich Sc isotopes around, and even beyond, neutron number N=34. Investigation of exotic nuclei in this region was the goal of the third SEASTAR campaign at RIKEN-RIBF. Neutron-rich isotopes in the vicinity of 53K were produced by fragmentation of a primary 70Zn beam on a 9Be target. Known and new γ-ray transitions of the isotope 55Sc were observed and new γ-rays from 57,59Sc identified for the first time. Observed γ spectra from 55,57,59Sc will be presented together with preliminary level schemes. They will be discussed in the framework of the tensor-driven shell evolution.
Supported by BMBF under Grant Nos. 05P19/21RDFN1.