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FIZIKA B 20 (2011) 2, 107-116
 
STRANGENESS PHYSICS AT MAMI: FIRST RESULTS AND PERSPECTIVES
PATRICK ACHENBACH
for the A1 Collaboration
Institut für Kernphysik, Johannes Gutenberg-Universität, Mainz,
Germany
E-mail address: patrick@kph.uni-mainz.de
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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