Bochum 2018 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 3: Structure and Dynamics of Nuclei I

HK 3.3: Vortrag

Montag, 26. Februar 2018, 14:45–15:00, HZO 70

Phase-imaging ion-cyclotron-resonance detection with ISOLTRAP at CERN — •Jonas Karthein for the ISOLTRAP collaboration — CERN, Geneva, Switzerland — Universität Heidelberg, Germany — MPI für Kernphysik, Heidelberg, Germany

The Penning-trap mass spectrometer ISOLTRAP, located at the radioactive ion beam facility ISOLDE at CERN, performs high-precision mass measurements of short-lived nuclides. This gives access to the study of nuclear-structure effects and provides precision β-decay Q-values to test nuclear models and fundamental interactions. Previously the measurement principle has been the time-of-flight ion-cyclotron-resonance detection technique, which limits accessible half-lives and relative uncertainties. With the new phase-imaging ion-cyclotron-resonance (PI-ICR) detection technique [S. Eliseev et al., Phys. Rev. Lett. 110 082501 (2013)], experiments can be performed with fewer ions and higher resolving power, providing access to new areas of the nuclear chart and to new physics. This talk will report on the ion-optical improvements required for the implementation of PI-ICR at ISOLTRAP, as well as results from first on-line measurements in both the high-precision and high-accuracy regimes. During a systematic on-line study the Q-value of the ⁸⁸Sr-⁸⁸Rb β-decay was determined with an uncertainty of < 130 eV. Furthermore, the separation of the low-lying isomeric states in ¹²⁷Cd and ¹²⁹Cd was achieved, from which their excitation energy was determined. A mass resolving power m/Δ m > 10⁶ was reached for only 100 ms measurement time compared to m/Δ m ∼ 5·10⁴ in ToF-ICR.