Mainz 2012 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 53: Poster – Instrumentation

HK 53.1: Poster

Donnerstag, 22. März 2012, 14:00–16:00, P Foyer

Charged Particle Identification in Reactions with Open Strangeness 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, including elementary kaon production as well as decay-pion spectroscopy of electro-produced Λ-hypernuclei.

For charged particle detection three high-resolution magnetic spectrometers and the Kaos spectrometer, specially dedicated to the detection of kaons, are used. The detector system of Kaos was upgraded for these experiments to operate even at very forward scattering angles with respect to the 1.5 GeV electron beam. It features a set of multiwire proportional chambers, a TOF system with two scintillator walls and a Cherenkov detector of n= 1.05 aerogel.

Single-arm particle identification with Kaos for momenta up to 1.2 GeV/c as well as the timing performance in coincidence measurements will be presented, including the separation of e^±, µ⁻, π^±, K⁺ and p from nuclear targets. Where the identification of kaons on top of a huge background of positrons is one of the major challenges of the experiment.

This project is supported by EU HadronPhysics2 (SPHERE).