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MPINP:
Präzisionsexperimente - Abteilung Blaum
Abstract:
This thesis presents the implementation and improvement of the Phase-Imaging Ion-Cyclotron-Resonance (PI-ICR) detection technique at the ISOLTRAP experiment, located at the
ISOLDE / CERN, with the purpose of on-line high-precision and high-resolution mass spectrometry.
Extensive simulation studies were performed with the aim of improving the phase imaging
resolution and finding the optimal position for detector placement. Following the
outcome of these simulations, the detector was moved out of a region of electric-field distortion and closer to the center of the Penning trap, showing a dramatic improvement in
the quality and reproducibility of the phase-imaging measurements. A new image reconstitution and analysis software for the MCP-PS detector was written in Python and ROOT
and introduced in the framework of PI-ICR mass measurements. The state of the art in the
field of time-of-flight ion-cyclotron-resonance measurements is illustrated through an analysis
of on-line measurements of the mirror nuclei 21Na/Ne and 23Mg/Na using the Ramsey
excitation pattern. The Q-values determined from this analysis play an important role for
verifying the Conserved-Vector-Current hypothesis and for testing the unitarity of the CKM
quark-mixing matrix. Finally, the results of a first high-precision, on-line measurement using
the PI-ICR technique are presented, addressing the Q-value of the 88Rb- 88Sr ß-decay.
