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Berlin 2005 – scientific programme

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HK: Physik der Hadronen und Kerne

HK 32: Kernphysik/Spektroskopie

HK 32.2: Group Report

Tuesday, March 8, 2005, 17:00–17:30, TU MA005

Recent mass measurements with ISOLTRAP — •Alexander Herlert — Institut für Physik, Ernst-Moritz-Arndt-Universität Greifswald, 17487 Greifswald, Germany — CERN, Physics Department, 1211 Geneva 23, Switzerland

The Penning trap mass spectrometer ISOLTRAP at ISOLDE/CERN is devoted to accurate mass measurements of short-lived nuclides. Recent mass measurements with a relative mass uncertainty of only 1×10−8 provide new data for tests of nuclear and astrophysical models as well as new input for fundamental tests of the weak interaction. Examples are the mass determination of 22Mg, where the comparative half-life of the superallowed beta decay has been obtained for a further test of the conserved-vector-current hypothesis and the unitarity of the Cabibbo-Kobayashi-Maskawa matrix [1], and the mass measurement of 35K, which allows a stringent test of the quadratic form of the isobaric multiplet mass equation for isospin quartets.
In addition to the mass measurements a new experimental technique has been tested, where for the first time the daughter ion of a beta-decaying nuclide was stored after the decay in a Penning trap and investigated for mass determination. This in-trap decay mass spectrometry as demonstrated for 37K → 37Ar offers a new approach to obtain nuclides that are not delivered from a radioactive ion-beam facility. A summary of all recent mass measurements as well as the status of ISOLTRAP will be presented.
[1] M. Mukherjee et al., Phys Rev. Lett. 93, 150801 (2004)

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