Dresden 2013 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 35: Instrumentation

HK 35.4: Talk

Tuesday, March 5, 2013, 15:00–15:15, WIL-A221

Kaon Detection at 0^∘ Scattering Angle at MAMI — •Florian Schulz — Institut für Kernphysik, Johannes Gutenberg-Universität, Mainz

At the Mainz Microtron MAMI experiments in the strangeness sector are being performed by the A1 Collaboration; most recently the decay-pion spectroscopy of electro-produced Λ-hyperons.

A first pioneering experiment aimed to the detection of K⁺, with the Kaos spectrometer placed at 0^∘ scattering angle, in coincidence with π⁻ from weak decays. The momentum of the pion emitted in two-body decays is related to the not precisely known mass of any produced Λ-hypernucleus. By its detection with high-resolution magnetic spectrometers the expected mass resolution is <30 keV.

In order to advance to an efficient physics run with sufficient statistics, it was nessesary to reduce the electromagnetic background produced at very forward angles by the 1.5 GeV electron beam. Therefore an energy-degrader of up to 12 cm lead was added directly in front of the detector system of Kaos.

The method of kaon identification, upgrades of the detector system, and performance of the recently completed next stage of the experiment, which improved luminosity by one order of magnitude, will be covered in this talk.