SMuK 2021 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 8: Instrumentation III
HK 8.4: Vortrag
Dienstag, 31. August 2021, 15:00–15:15, H1
Development of a lithium target for Λ3H observation — •Julian Geratz1, Patrick Achenbach1, Philipp Eckert1, Philipp Herrmann1, Pascal Klag1, Josef Pochodzalla1, and Marcell Steinen2 for the A1 collaboration — 1Inst. für Kernphysik, JGU Mainz — 2Helmholtz Institut Mainz
Studies of light hypernuclei offer insights into the strong nuclear force. For this purpose, the Λ4H has been observed at the electron accelerator MAMI in Mainz through pionic decay. In this experiment, beryllium was used as target material. Observation of the hypertriton, the lightest hypernucleon, by this method would require an increase in luminosity by about a factor of 10.
To study the Λ3H a new target was designed and has been tested. This new target for hypertriton observation uses lithium as target material. As target material, lithium offers higher Λ3H yield than beryllium, as it has fewer possible fragmentation channels. Furthermore, its low density enables a new target geometry, with a thick target along the beam and a small transverse dimension, thus limiting the energy loss variations of the decay pions.
The dimensions of the target are 1.5 × 50 × 50 mm3, the electron beam will travel through 50 mm of lithium. As a material, lithium is difficult to handle due to its low melting point and high reactivity.
The challenges of using lithium as target material, their solutions and the advantages of lithium are the topic of this presentation.
Supported by DFG (PO 256/7-1) and by the European Union’s Horizon 2020 programme, No 824093.