https://doi.org/10.1051/epjconf/202227101006
Commissioning of the hypertriton binding energy measurement at MAMI
1 Institute for Nuclear Physics, Johannes Gutenberg University Mainz, 55099 Mainz, Germany
2 Graduate School of Science, Tohoku University, Sendai, Miyagi 980-8578, Japan
3 Helmholtz Institute Mainz, GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt, Johannes Gutenberg University Mainz, 55099 Mainz, Germany
4 Key Laboratory of Nuclear Physics and Ion-beam Application (MOE), Institute of Modern Physics, Fudan University, Shanghai 200433, China
5 Shanghai Research Center for Theoretical Nuclear Physics, NSFC and Fudan University, Shanghai 200438, China
6 Department of Physics, Graduate School of Science, The University of Tokyo, Tokyo 113-0033, Japan
* e-mail: eckert@uni-mainz.de
** Now at Thomas Jefferson National Accelerator Facility (JLab), Newport News, Virginia 23606, USA
Published online: 9 November 2022
A high-precision hypernuclear experiment has been commissioned at the Mainz Microtron (MAMI) to determine the hypertriton Λ binding energy via decay-pion spectroscopy. The method has been successfully pioneered with 4ΛH studies in the last decade. The experiment makes use of a novel high luminosity lithium target with a length of 45mm while being only 0.75mm thick to keep momentum smearing of the decay pions low. The target-to-beam alignment as well as the observation of the deposited heat is achieved with a newly developed thermal imaging system. Together with a precise beam energy determination via the undulator light interference method a recalibration of the magnetic spectrometers will be done to obtain a statistical and systematic error of about 20 keV. The experiment started in the summer of 2022 and initial optimization studies for luminosity and data quality are presented.
© The Authors, published by EDP Sciences, 2022
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