Speaker
Dr
Chabouh Yazidjian
(GSI, Atomic Physics Group, Darmstadt, Germany)
Description
In 2006 the mass measurements at the tandem Penning trap spectrometer ISOLTRAP
investigated short-lived nuclides relevant for superallowed beta decays, nuclear
structure, and nucleosynthesis. After the installation of a new detector [1] and a
temperature stabilization system, which improved respectively the precision and the
accuracy of the experiment, a new excitation scheme has been successfully applied.
Furthermore, for the first time mass selected iron nuclides have been directly
studied at ISOLDE.
To contribute to the test of the unitarity of the CKM quark mixing matrix, a mass
uncertainty below 1 keV is required. For the 38Ca and 26Al nuclides a new excitation
scheme has been applied in order to reach a better precision within the given beam
time period. Instead of the quadrupolar radiofrequency (rf) excitation, time
separated oscillating fields, known as Ramsey technique, have been used resulting in
a reduction of the uncertainty in the cyclotron frequency measurement by a factor of
3 compared to the standard technique within identical experimental conditions and
beam time.
For the first time, refractory neutron-rich iron nuclides 61-63Fe were produced in
the preparation Penning trap of ISOLTRAP by use of the in-trap decay technique [2].
Mass-selected manganese nuclides 61-63Mn from the ISOLDE target were stored in the
preparation trap, waiting for the beta decay towards their iron daughter nuclide.
After additional cooling the neutron-rich iron ions were transferred to the precision
trap for precise mass determination dm/m in the order of 10-8.
The new techniques developed for high-precision mass experiments and the associated
results will be presented together with outcomes from beam times dedicated to the
investigation of neutron-rich Cd and Ag nuclides.
[1] C. Yazidjian et al., accepted in Hyp. Int.
[2] A. Herlert et al., New J. Phys. 7, 44 (2005)
Author
Dr
Chabouh Yazidjian
(GSI, Atomic Physics Group, Darmstadt, Germany)
Co-authors
Dr
Alban Kellerbauer
(MPI for Nuclear Physics, Heidelberg, Germany)
Dr
Alexander Herlert
(CERN, Geneva, Switzerland)
Dr
Céline Guénaut
(NSCL at Michigan State University, East Lansing, Michigan, USA)
Dr
Dave Lunney
(CSNSM, Orsay, France)
Dr
Dietrich Beck
(GSI, Atomic Physics Group, Darmstadt, Germany)
Dr
Frank Herfurth
(GSI, Atomic Physics Group, Darmstadt, Germany)
Prof.
H-Juergen Kluge
(GSI, Atomic Physics Group, Darmstadt, Germany)
Dr
Klaus Blaum
(University of Mainz, Institute of Physics, Mainz, Germany)
Prof.
Lutz Schweikhard
(University of Greifswald, Institute of Physics, Greifswald, Germany)
Mr
Martin Breitenfeldt
(University of Greifswald, Institute of Physics, Greifswald, Germany)
Mr
Romain Savreux
(GSI, Atomic Physics Group, Darmstadt, Germany)
Mr
Sebastian George
(University of Mainz, Institute of Physics, Mainz, Germany)
Dr
Stefan Schwarz
(NSCL at Michigan State University, East Lansing, Michigan, USA)
Mrs
Ulrike Hager
(University of Jyväskylä, Department of Physics, Jyväskylä, Finland)
