Münster 2017 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 27: Poster
HK 27.14: Poster
Dienstag, 28. März 2017, 16:45–18:45, F Foyer
First observation of Σ0 production in proton induced reactions on a nuclear target — •Tobias Kunz and Jürgen Friese for the HADES collaboration — Technische Universität München, Physik Department E62
We have studied the production of neutral Σ0 baryons in the nuclear reaction p + Nb at an incident proton energy Ekin = 3.5 GeV. The measurement has been performed with the HADES experiment setup at GSI, Darmstadt. Σ0 → Λ0 γ decays were identified via the charged decay Λ0 → p π− coincident to e+e− pairs from external gamma conversion. Experimental details, analysis procedures and background determination are presented. An observed total of about 250 candidate events is used to determine the Λ + Σ/Σ production ratio. The obtained numbers and spectra are compared to predictions from transport model calculations and are discussed in the context of thermal particle production in nuclear fireballs.
* supp. by BMBF(05P15WOFCA), GSI F&E(TMLFRG1316) and the Excellence Cluster Universe