SMuK 2021 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 30: Structure and Dynamics of Nuclei II

HK 30.6: Talk

Friday, September 3, 2021, 15:45–16:00, H4

Mass measurements and spectroscopy of actinides at IGISOL and FRS Ion Catcher — •Ilkka Pohjalainen for the FRS Ion Catcher collaboration — GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany

There is a significant lack of experimental data on fundamental nuclear properties such as nuclear masses of actinides. At the IGISOL facility of the University of Jyväskylä, Finland, light-ion fusion reactions with actinide targets provide unique possibilities to perform decay- and optical spectroscopy as well as direct mass measurements of actinide isotopes. Recently, decay spectroscopy of several short-lived isotopes including ^225,226Pa have been performed with protons (up to 65 MeV) on ²³²Th targets. Penning trap mass spectrometry utilizing the Phase-Imaging Ion Cyclotron Resonance method at JYFLTRAP is to be used for high-precision mass measurements, but also to obtain production yield of long-lived isotopes such as ²²⁹Th, which is of special interest due to the extremely low energy isomer. A wider range of isotopes is now also available due to more exotic targets fabricated via a novel drop-on-demand printing technique at the Nuclear Chemistry Institute of Johannes Gutenberg-Universität of Mainz.

In addition, the recently performed mass measurements in the actinide region at the FRS Ion Catcher (FRSIC) at the Fragment Separator at GSI will be presented. By impinging a 1 GeVA ²³⁸U beam on a Be target, the isotopes are produced in fragmentation reactions. The ions are stopped in the cryogenic stopping cell and measured with the high resolution multiple-reflection time-of-flight mass spectrometer.