Speaker
Description
ISOLTRAP [1] mass measurements of neutron rich copper isotopes are presented. $^{79}$Cu 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 $^{78}$Ni 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 [4] 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.
Acknowledgements:
Federal Ministry of Education and Research: 05P12HGCI1, 05P12HGFNE, 05P15HGCIA, 05P15ODCIA, the Max-Planck Society, the French IN2P3, Wolfgang Gentner Scholarship, the ISOLDE Collaboration.
References:
[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).
[4] M. König et al. Int. J. Mass Spectrom. Ion. Process 142, 95–116 (1995).
