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UBC Theses and Dissertations

The northern shore of the N = 40 island of inversion through precision mass measurements and developments towards phase-imaging ion-cyclotron-resonance at the TITAN MPET Porter, William


High-precision nuclear mass measurements are extremely important in furthering our understanding of the nucleus and its properties and interactions. Various different mass spectrometers exist to determine masses of nuclei far from the valley of stability to sufficient precisions, with different strengths applicable to different measurement conditions. TRIUMF's Ion Trap for Atomic and Nuclear science (TITAN) is home to two of these types of spectrometers: the Multiple-Reflection Time-of-Flight Mass Spectrometer (MR-ToF-MS) and Measurement Penning Trap (MPET). The TITAN MR-ToF-MS, which performs measurements quickly and with a large dynamical range, was used in the measurement of ⁶³⁻⁷⁰Fe, including first-time direct measurements with precision of 10⁻⁷ of ⁶⁸⁻⁷⁰Fe. These measurements are relevant to the study of nuclear structure in the N = 40 island of inversion, and used to probe the extent of this island in the neutron-rich Fe isotope chain. The TITAN MPET, which functions as TITAN's most precise mass spectrometer, is amid a high-precision upgrade to enable precise mass measurements below 1e⁻⁸. This includes the transition of MPET to the Phase-Imaging Ion-Cyclotron-Resonance (PI-ICR) technique, which offers a five-fold increase in precision over previously used techniques. The Phase-Imaging Analysis Tool (PhIAT) has been developed to enable easy, quick and user-friendly analysis of future PI-ICR mass measurements at the TITAN facility.

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