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SYMD: Symposium SMuK Dissertation Prize 2021

SYMD 1: Symposium SMuK Dissertation Prize 2021

SYMD 1.2: Hauptvortrag

Montag, 30. August 2021, 14:30–15:00, Audimax

Next-Generation Mass Spectrometry of Exotic Isotopes and Isomers — •Jonas Karthein — Massachusetts Institute of Technology

This cumulative dissertation at the ISOLTRAP mass spectrometer at CERN comprises the transition from the well-established Penning-trap mass spectrometry (PTMS) technique, ToF-ICR, to the next-generation PTMS technique, called PI-ICR. I will introduce the highest precision ever achieved on the mass of a short-lived isotope that allowed for a reduction of the Q_EC-value uncertainty of the ²¹Na → ²¹Ne and ²³Mg → ²³Na electron-capture decays by a factor of five compared to their literature values. Within these findings, the most precise Ft-values and, in the case of ²¹Na → ²¹Ne, a new V_ud-element value of the CKM quark-mixing matrix were derived and found to agree with the standard model of particle physics.

Furthermore, ultra-high mass resolving powers exceeding 10⁶ using PI-ICR allowed for the first spatial resolution of isomeric states in neutron-rich cadmium isotopes. Thus, this publication presented the first experimental data describing the N = 82 neutron-shell closure below the proton-magic Z = 50 while implying a drastic weakening of the N = 82 shell. Moreover, these measurements allowed for sophisticated comparison with state-of-the-art nuclear-theoretical models.

I will also highlight the first mass measurements around the doubly-magic ¹⁰⁰Sn (N = Z = 50) that have been accepted for publication in Nature Physics.