Heidelberg 2015 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 48: Poster
HK 48.34: Poster
Mittwoch, 25. März 2015, 17:00–19:00, C/Foyer
New Mass Analysis and Results for Neutron Rich Nuclei performed with Isochronous Mass Spectrometry — •Marcel Diwisch1, Ronja Knöbel1,2, Zygmunt Patyk3, Hans Geissel1,2, Wolfgang Plaß1,2, Christoph Scheidenberger1,2, and Helmut Weick2 — 1Justus-Liebig-Universität Gießen, Gießen, Germany — 2GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt, Germany — 3Soltan Institute for Nuclear Studies, Warsaw, Poland
The Isochronous Mass Spectrometry (IMS) allows to measure masses of rare exotic nuclei in a storage ring in a timescale of tens of µs. The ring is operated in an isochronous mode, i.e. such that particles with different velocities but same mass-to-charge ratio (m/q) travel different paths in the ring arcs (faster ions travel longer paths whereas slower ions travel shorter paths). This means that for each m/q a fix revolution time exists and can be measured by a time-of-flight (TOF) detector which then yields the masses of the nuclei for known charge states. A new analysis approach of IMS data with a correlation matrix method allowed combining data with different quality. The latest production run was using an additional determination of the magnetic rigidity which increased the resolving power of the experiment. Combining this experiment with previous experiments one can increase the statistics and accuracy of the overall mass determination. It was possible to deduce mass values of neutron rich isotopes which have not been measured before. One of those isotopes is 130Cd which is a very important nuclei involved in the r-process. Those mass values and a comparison to theoretical predictions will be presented in the poster.