Darmstadt 2008 – wissenschaftliches Programm

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MS: Fachverband Massenspektrometrie

MS 6: Präzisionsmassenspektrometrie und grundlegende Anwendungen

MS 6.2: Vortrag

Dienstag, 11. März 2008, 15:00–15:15, 3E

Nuclear mass measurements for nucleosynthesis studies at ISOLTRAP — •Martin Breitenfeldt for the ISOLTRAP collaboration — Institut für Physik, Ernst-Moritz-Arnd-Universität Greifswald

At the tripple trap mass spectrometer ISOLTRAP at ISOLDE/CERN mass measurements on exotic nuclides are performed down to a precision of δ m/m=8·10⁻⁹. These fundamental ground state property finds applications in many theoretical calculations in the broad field of nuclear physics and astrophysics. In 2007 the ISOLTRAP mass measurements focussed on nuclear structure and nucleosynthesis studies. The beam times were dedicated to the mass determination of neutron-deficient and neutron-rich nuclides relevant for the investigation of the rp- and r-process, respectively. For neutron-deficient Cd isotopes, close to the doubly magic ¹⁰⁰Sn and the end-point region of the rp-process, the first direct mass measurement of ⁹⁹Cd was performed, giving accurate data at the neutron shell closure N=50. Furthermore, measurements aimed at the masses of neutron-rich Ag and Cd nuclides, which will give input values for astrophysics calculations for the r-process, especially at the waiting point ¹³⁰Cd.