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HK: Fachverband Physik der Hadronen und Kerne

HK 4: Structure and Dynamics of Nuclei I

HK 4.1: Gruppenbericht

Montag, 16. März 2026, 16:15–16:45, AM 00.011

Implementation of the recoil distance Doppler-shift technique at the radioactive beam facility ISOLDE — •Christoph Fransen¹, Alina Didik¹, Andrey Blazhev¹, Rob Bark², Max Droste¹, Casper-David Lakenbrink¹, Peter Reiter¹, Carlotta Porzio³, and Nigel Warr^1,4 for the IS 656 collaboration — ¹University of Cologne, Institute for Nuclear Physics, Germany — ²iThemba LABS, South Africa — ³CERN, Switzerland — ⁴University of Liverpool, UK

Absolute transition strengths between excited states yield fundamental information on nuclear structure and can be determined from level lifetimes. The recoil distance Doppler-shift (RDDS) technique employing so-called plunger devices is valuable to measure lifetimes in the picosecond range and has been in the focus of our Cologne group for many years. In this talk, we will present the first RDDS campaign at ISOLDE. Particular emphasis will be paid to the special conditions for such experiments at ISOLDE, e.g., with respect to radioactive beams, the sophisticated plunger device, the reaction kinematics, and the special requirements for targets. As a main example, we will focus on an experiment on ¹⁴⁴Ba done recently by our group aiming for the implementation of the RDDS technique at ISOLDE and the search for octupole correlations. Further, RDDS experiments on ¹⁶²Yb and ²⁰⁷Tl performed within the same campaign will be briefly discussed that support the high potential of this technique for investigations of exotic nuclei. Supported by the BMFTR, Joint Project 05P2024 - ISOLDE, Grant No. 05P24PK2.

Keywords: radioactive beams; recoil distance method; level lifetime measurements