Gießen 2024 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 57: Hadron Structure and Spectroscopy VII
HK 57.1: Gruppenbericht
Mittwoch, 13. März 2024, 17:30–18:00, HBR 62: EG 18
High-resolution spectroscopy experiments with WASA-FRS at GSI — •Yoshiki K. Tanaka for the WASA-FRS and Super-FRS Experiment collaboration — RIKEN, Wako, Saitama, Japan
The NUSTAR Super-FRS Experiment Collaboration performs high-resolution spectrometer experiments at the border line of atomic, nuclear and hadron physics. The spectroscopic study of exotic hadron-nucleus bound systems is one of the important topics in hadron physics since such systems provide valuable information on hadron properties and interactions in the low-energy region of quantum chromodynamics. In this contribution, we report two pilot experiments recently performed with a newly constructed WASA-FRS setup that integrates the WASA central detector into the fragment separator FRS at GSI.
The first experiment aims at observing η′-meson bound states in carbon nuclei for studying in-medium η′-meson properties. We performed high-resolution missing-mass spectroscopy of the 12C(p,d) reaction near the η′-meson production threshold with the FRS and simultaneously detected particles emitted in the decay of the η′-mesic nuclei with the WASA detector. In the second experiment, we performed invariant-mass spectroscopy of light hypernuclei produced via projectile fragmentation of a 2 GeV/u 6Li beam. The π− emitted in the mesonic decay was measured with the WASA detector, whereas the residual ion was momentum-analyzed by the FRS. Both experiments were successfully conducted in 2022 in the framework of the FAIR phase-0 program at GSI. In this contribution, the current status of the data analysis as well as the preliminary results will be discussed.
Keywords: Mesic nucleus; Hypernucleus; Fragment Separator FRS at GSI