FIZIKA B 20 (2011) 2, 107-116

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for the A1 Collaboration
Institut für Kernphysik, Johannes Gutenberg-Universität, Mainz, Germany
E-mail address:

Received 26 January 2011;    Accepted 9 November 2011
Online 15 January 2012

During the last two years, several experimental approaches to strange systems have been realized at the spectrometer facility of the Mainz Microtron MAMI. An instrument of central importance for the strangeness electro-production program is the magnetic spectrometer Kaos that was installed during 2003-8, and is now operated by the A1 collaboration in (e,e′K) reactions on the proton or light nuclei. Since 2008, kaon production at low four-momentum transfers off a liquid hydrogen target was studied. The measurements are sensitive to details of the phenomenological models describing the reaction. Two very prominent isobar models, Kaon-Maid and Saclay-Lyon A, differ in the number of contributing nucleon resonances and their longitudinal couplings at the kinematics measured at MAMI. In order to use Kaos as a zero-degree double-arm spectrometer, a magnetic chicane comprising two compensating sector magnets was constructed and a new electron-arm focal-plane detector system was built.

PACS numbers: 25.30.Rw, 13.60.Le, 13.60.Rj
UDC 539.126

Keywords: kaon electroproduction reactions, missing mass spectroscopy, differential cross-sections

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