ISOLDE Workshop and Users meeting 2015

Mass measurements of neutron-rich copper isotopes and technical developments at ISOLTRAP

2 Dec 2015, 18:20

2h

61/1-201 - Pas perdus - Not a meeting room - (CERN)

Poster Poster Session

Speaker

Andree Welker (Technische Universitaet Dresden (DE))

Description

We present very recent ISOLTRAP [1, 2] measurements of neutron rich copper isotopes, where – with the help of the multi-reflection time-of-flight mass spectrometer – $^{79}$Cu was reached for the first time. Having 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. The measurements belong to an extended ISOLTRAP campaign on very neutron-rich nuclides for nuclear-structure and astrophysical cases To reach out to even further exotic nuclides at very high precision, a position-sensitive ion detector was installed behind the precision Penning trap. It will allow the application of the Phase-Imaging Ion-Cyclotron-Resonance (PI-ICR) [3] method, which was developed at SHIPTRAP/GSI. This new technique offers higher precision in less measurement time as well as a much higher resolving power, and thus ability to resolve low-lying isomers, compared to the present Time-of-Flight Ion-Cyclotron-Resonance technique [4]. The current status 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, the Max-Planck Society, the French IN2P3, 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).