Darmstadt 2016 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 31: Hauptvorträge I

HK 31.3: Hauptvortrag

Mittwoch, 16. März 2016, 12:00–12:30, S1/01 A1

Precision mass measurements and more at ISOLTRAP — •Frank Wienholtz for the ISOLTRAP collaboration — Ernst-Moritz-Arndt-Universität, Institut für Physik, Greifswald, Germany

Mass spectrometers at radioactive ion-beam facilities have to cope with ever-more demanding measurement conditions in order to succeed in gathering new data on the binding energy of exotic nuclei. These conditions are also quite diverse, ranging from cases in which the isotopes of interest are only produced in very low yields of some ions per second to others in which the ions of interests, although produced in reasonable quantities, are accompanied by isobaric contaminations several orders of magnitude more abundant. Furthermore, the purification and mass measurement processes have to be fast enough in order to reach exotic isotopes far away from the valley of stability, where half-lives drop well below hundred milliseconds.

The ISOLTRAP setup situated at the ISOLDE facility at CERN has been upgraded throughout the years to handle these extreme situations and determine further unknown binding energies on the way to an increased understanding of nuclear structures. This contribution will present the current status of the setup and with a focus on the most recent results. The topics range from the investigation of the N = 82 shell closure using neutron-rich cadmium masses, which are relevant for the rapid neutron capture process of nucleosynthesis, to nuclear structure studies around the double magic (Z=28, N=50) nucleus Ni-78 by probing exotic Cu isotopes. In addition, new measurements of rubidium, strontium and krypton isotopes in the mass A=100 region will be presented, which shed new light on a well-known shape-transition region of the nuclear chart. As an extension of the standard use of the ISOLTRAP setup, fast and highly selective single-ion counting techniques have been combined recently with the Resonant Ionization Laser Ion Source (RILIS) of ISOLDE. This combination allowed in-source laser-spectroscopy measurements for the study of shape coexistence. The new detection capabilities available at ISOLTRAP as well as recent on-line results will be presented.