Köln 2004 – scientific programme

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HK: Physik der Hadronen und Kerne

HK 33: Heavy Ions III

HK 33.2: Group Report

Wednesday, March 10, 2004, 14:30–15:00, E

The ion trap facility SHIPTRAP at GSI — •Michael Block — GSI, 64291 Darmstadt

The ion trap facility SHIPTRAP at GSI has been setup to enable precise investigations of nuclear, atomic and chemical properties of elements heavier than uranium. Therefore an ion trap system was installed behind the SHIP separator well known for the discovery of super heavy elements. SHIPTRAP allows for precision mass measurements, nuclear in-trap decay spectroscopy, laser spectroscopy and ion chemical reactions of elements produced in fusion reactions at SHIP. In order to inject the reaction products after separation from the primary beam into the traps their energy has to be reduced down to a few eV. This is accomplished in a helium buffer gas cell where the high energetic ions are stopped. The ions extracted from the cell by the gas flow through a small nozzle are cooled and isobarically purified by a combination of a radio frequency quadrupole buncher and a Penning trap. After preparation they are transferred into the second Penning where precision measurements are carried out. Purified and cooled low emittance beams can also be extracted for downstream experiments. In the ongoing commissioning phase all components of SHIPTRAP have been characterized in off-line tests.In on-line experiments at Garching and at GSI this year the efficiency of the stopping cell has been measured to be in the percent range. This will already allow for mass measurements of ions produced at SHIP within 2004. However, in order to access the super heavy elements that are only produced with cross sections of nb or less the overall efficiency has still to be improved.