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HK: Fachverband Physik der Hadronen und Kerne

HK 41: Structure and Dynamics of Nuclei VI

HK 41.2: Vortrag

Donnerstag, 30. März 2017, 14:30–14:45, F 2

Recent technical developments and mass measurements above the potentially doubly-magic nuclide ⁷⁸Ni at ISOLTRAP — •Andree Welker¹ and ISOLTRAP Kollaboration² — ¹TU-Dresden, Dresden, Deutschland — ²CERN, TU-Dresden, MPIK Heidelberg, Universität Greifswald,

ISOLTRAP [1] mass measurements of neutron rich copper isotopes are presented. ⁷⁹Cu could be addressed by the first time using a Multi-Reflection Time-of-Flight Mass Spectrometer (MR-ToF MS) [2]. With only one proton above the Z = 28 core, the binding energies of the copper isotopes are sensitive to the evolution of nuclear shell structure close to the doubly-magic ⁷⁸Ni isotope. Preliminary results in combination with a shell-model theory will be shown. To reach even more exotic nuclides and to improve ISOLTRAP’s mass precision limit, a position-sensitive ion detector was installed upstream the precision Penning-trap. It will allow the application of the Phase-Imaging Ion-Cyclotron-Resonance (PI-ICR) detection method developed at SHIPTRAP/GSI [3]. This new method offers compared to the presently used Time-Of-Flight Ion-Cyclotron-Resonance detection technique higher precision and resolution in shorter measurement time, and thus the ability to resolve low-lying isomers. The current status, first measurements, and an outlook on the implementation of the PI-ICR technique at ISOLTRAP will be presented. [1] S. Kreim et al. Nucl. Instrum. Methods B 317, 492-500 (2013). [2] R.N. Wolf et al. Int. J. Mass Spectrom. 349-350, 123-133 (2013). [3] S. Eliseev et al. Appl. Phys. B 114, 107-128 (2014).