SAMOP 2021 – scientific programme

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A: Fachverband Atomphysik

A 2: Precision spectroscopy of atoms and ions (joint session A/Q)

A 2.7: Poster

Monday, September 20, 2021, 16:30–18:30, P

Laser photodetachment spectroscopy in an MR-ToF device — •David Leimbach for the GANDALPH and MIRACLS collaborations — Department of Physics, University of Gothenburg, Gothenburg, Sweden — CERN, Geneva, Switzerland — Institut für Physik, Johannes Gutenberg-Universität, Mainz, Germany

The electron affinity (EA) is the energy released when an additional electron is bound to a neutral atom, creating a negative ion. Due to the lack of a long-range Coulomb attraction, the EA is dominated by electron-correlation effects. A prime example for the importance of the accurate description of the electron correlation is the theoretical calculation of the specific mass shift, which is an indispensable ingredient when extracting nuclear charge radii from laser-spectroscopy work. Although the isotope shift (IS) in the EA of the stable chlorine isotopes has been determined experimentally, recent calculations improved the theoretical precision beyond the measurement precision. By using a MR-ToF device we are able to perform laser photodetachment spectroscopy while reusing the ion beam, thereby increasing the efficiency in the detection method. Additionally, we will extend this type of studies to long-lived radionuclides for the first time by determining the IS of 36Cl. This novel approach could be applied to IS measurements of short-lived isotopes as well as EA determination of sparsely produced and eventually superheavy radioelements. We will present the technique, developments and status of the experimental campaign.