SMuK 2023 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 32: Structure and Dynamics of Nuclei VI
HK 32.3: Vortrag
Mittwoch, 22. März 2023, 14:30–14:45, SCH/A215
The search for double alpha decay of 224Ra at the FRS Ion Catcher — •Heinrich Wilsenach for the Double Alpha IN2P3-CEA-GSI collaboration — Justus-Liebig-Universität Gießen, Gießen, Germany — Tel Aviv University, Tel Aviv, Israel
Double alpha decay has been predicted since the 1980s. The most probable scenario for this decay mode is the simultaneous tunnelling of two alpha particles through the coulomb barrier and their emission in opposite directions. Recent theoretical studies [1] have predicted a back-to-back double alpha decay branching ratio for 224Ra of 1.8×10−7%.
A project to measure this small branching ratio has been performed at the FRS (FRagment Separator) Ion Catcher at Gesellschaft für Schwerionenforschung (GSI). This project utilized the thermalization of 228Th alpha recoils in a cryogenic stopping cell (CSC) and the preparation of a clean beam of 224Ra by a radio-frequency-quadrupole (RFQ) beamline. Two double-sided silicon strip detectors (DSSD) were used to read out each alpha particle’s position, time and energy coming from the implanted 224Ra.
This talk will give insight into the design and setup of the experiment, including Monte Carlo simulations. It will conclude with preliminary results from the first 135 day long data taking run.
[1] F. Mercier et al., PRL 127, 012501 (2021)