Darmstadt 2008 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 35: Elektromagnetische und Hadronische Sonden

HK 35.3: Vortrag

Donnerstag, 13. März 2008, 17:15–17:30, 1C

Quasifree Λ, Σ⁰, and Σ⁻ electroproduction from ^1,2H, ^3,4He and carbon — •Frank Dohrmann — FZ Dresden-Rossendorf, Institut f. Strahlenphysik, Dresden, Germany

A comprehensive study of kaon electroproduction on light nuclei has been conducted in Hall C of the Thomas Jefferson National Accelerator Facility by the E91-016 collaboration. Data were obtained using electron beams of 3.245 GeV impinging on special high density cryogenic targets of ^1,2H, ^3,4He, as well as on a solid carbon target. Specifically, the measurements on ^3,4He are the first performed. Previously, the observation of hypernuclear bound states was discussed [1]. This presentation will give the final results of the data analysis, focussing on the quasifree production cross sections for the Λ and Σ hyperons for the various target nuclei [2]. We also derive effective proton numbers from our data and compare these numbers with model calculations. Deviations may indicate possible in-medium modifications of the kaon electroproduction mechanism.

[1] F. Dohrmann et al [E91016 collab.] Phys. Rev. Lett. 93 (2004) 242501

[2] F. Dohrmann et al [E91016 collab.] Phys. Rev. C in print