Darmstadt 2008 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 15: Kernphysik / Spektroskopie
HK 15.1: Gruppenbericht
Montag, 10. März 2008, 16:30–17:00, 2G
Recent developments and results of ISOLTRAP — •Sebastian George for the ISOLTRAP collaboration — Institut für Physik, Johannes Gutenberg-Universität Mainz, 55099 Mainz, Germany — GSI, 64291 Darmstadt, Germany
The Penning trap mass spectrometer ISOLTRAP, installed at the ISOLDE/CERN facility, is dedicated to high-precision mass measurements on short-lived radionuclides. In the past three years an improved measurement technique, namely Ramsey’s excitation method of separated oscillatory fields, was adopted to the Penning trap experiment [1]. The technique has been consistently tested, implemented, and used in an online mass measurement for the first time and results in a more precise or much faster measurement. Recently, the first radioactive mass measurements have been performed using this technique. The masses of the nuclides 26Al and 38Ca [2,3] with uncertainties at the level of 10−8 can be used to test the electroweak part of the Standard Model. In addition, 26Al together with the mass of 27Al is used to solve a problem of conflicting data from γ-spectroscopy in this mass region. Further technical developments and results and the present status of ISOLTRAP will be presented.
[1] S. George et al., Int. J. Mass Spectr. 264, 110 (2007)
[2] S. George et al., Phys. Rev. Lett. 98, 162501 (2007)
[3] S. George et al., to be published (2008)