Berlin 2005 – wissenschaftliches Programm
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HK: Physik der Hadronen und Kerne
HK 32: Kernphysik/Spektroskopie
HK 32.2: Gruppenbericht
Dienstag, 8. März 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)