SMuK 2021 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 30: Structure and Dynamics of Nuclei II

HK 30.5: Talk

Friday, September 3, 2021, 15:30–15:45, H4

Mass measurements of neutron-deficient Yb isotopes and nuclear structure at the extreme proton-rich side of the N=82 shell — •Beck Sönke^1,2, Kootte Brian^3,4, and Dedes Irene^5,6 for the TITAN collaboration — ¹Justus-Liebig Universität, Giessen — ²GSI, Darmstadt — ³TRIUMF, Vancouver, Canada — ⁴University of Manitoba, Winnipeg, Canada — ⁵Polish Academy of Sciences, Kraków, Poland — ⁶Marie Curie-Skłodowska University, Lublin, Poland

The nuclear mass reflects the binding energy of a nucleus and provides key information for nuclear structure, nuclear reactions and related fields like nuclear astrophysics.

High-accuracy mass measurements of neutron-deficient Yb isotopes were performed at TRIUMF using TITAN’s multiple-reflection time-of-flight mass spectrometer (MR-TOF-MS). For the first time, the novel technique of mass selective re-trapping was used in an on-line experiment with short-lived ions. With this technique, the MR-TOF-MS can act as its own isobar separator, enabling measurements two isotopes further away from stability.

The ground state masses of ^150,153Yb and the excitation energy of the long lived J^π= 11/2⁻ isomer ¹⁵¹Yb^m were measured for the first time. As a result, the persistence of the N=82 shell with almost unmodified shell gap energies was established up to the proton dripline. Furthermore, the puzzling systematics of the h_11/2-excited isomeric states of the N=81 isotones were unraveled using state-of-the-art mean field calculations.