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MS: Massenspektrometrie

MS 8: Pr
äzisions-MS kurzlebiger Nuklide 1

MS 8.2: Vortrag

Montag, 7. März 2005, 12:15–12:30, HU Senatssaal

The first on-line mass measurement at the iontrap facility SHIPTRAP — •Saidur Rahaman — GSI, Darmstadt, Germany

The ion trap facility SHIPTRAP at GSI Darmstadt was set-up to enable various experiments on heavy elements produced in fusion evaporation reactions at the velocity filter SHIP. In the first phase SHIPTRAP focuses on precision mass measurements of nuclei not available at other trap facilities. The speciality of SHIPTRAP is the access to the region of the heaviest elements where the majority of the masses is only known from extrapolations with a few 100 keV precision. However, most of the masses in this region are linked to only a few α-decay chains. Hence direct mass measurements from which nuclear binding energies can be deduced are required.

The commissioning of the SHIPTRAP facility included extensive off-line tests in order to characterize and optimize all individual components. In on-line experiments the efficiency of the stopping cell was measured with radioactive ions to be 5-8%. This limits the overall efficiency of the SHIPTRAP to currently about 1%. In a beam time in July 2004 radionuclides around ¹⁴⁷Ho were produced in the reaction ⁹²Mo(⁵⁸Ni,xpxn) with a primary beam energy of 4.35 MeV/u. In this run the first mass measurements with the SHIPTRAP Penning traps were performed. The masses of ¹⁴⁷Ho, ¹⁴⁷Er and ¹⁴⁸Er were measured for the first time with a precision of 10⁻⁷.