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| Home > GSI as publisher > [GSI Diss 2005-02] The mass of $^{22}Mg$ and a concept for a novel laser ion source trap (15.12.2004) |
| Dissertation / PhD Thesis/Internal Report | GDS-IMPORT-DOC-2007-Jun-74-1 |
2005
GSI
Darmstadt
Report No.: GSI Diss 2005-02
Abstract: The mass of 22Mg and a concept for a novel laser ion source trap: Clean and high-quality radioactive ion beams can be prepared by combining ion trap and resonance laser ionization techniques. A feasibility study for such a laser ion source trap has been carried out which shows enormous improvement in the beam emittance, purity, and in addition allows for a variation of the ion beam time structure. Direct high-precision mass measurements around mass number A = 22 are of utmost importance. First, the masses of the superallowed β-emitter 22Mg and its daughter 22Na are needed to test the conserved-vector-current (CVC) hypothesis and the Cabibbo-Kobayashi-Maskawa (CKM) matrix unitarity, both being predictions of the Standard Model. Second, to calculate the reaction rate of 21Na(p;γ)22Mg the involved masses are required very accurately. This rate is needed in order to extract an upper limit on the amount of a characteristic γ-radiation emitted from classical nova bursts which has been searched for but not yet detected. At the triple trap mass spectrometer ISOLTRAP at ISOLDE/CERN, the masses of 21Na, 22Na, and 22Mg have been measured with relative uncertainties of better than 1.5x10-8 . This solved a confict between two available mass values for 22Mg. The mass measurements as well as their impact are discussed. In addition a vivid description of the present ISOLTRAP setup along with the standard experimental procedure is described. Special emphasis has been made on the development of a carbon cluster ion source for absolute mass measurements at ISOLTRAP.
Keyword(s): Dissertation
Note: IMPORT aus dem GDS: https://www.gsi.de/documents/DOC-2007-Jun-74.html
Note: Universität Heidelberg, Diss., 2004
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