Berlin 2005 – wissenschaftliches Programm
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HK: Physik der Hadronen und Kerne
HK 9: Elektromagnetische und Hadronische Proben
HK 9.2: Vortrag
Freitag, 4. März 2005, 17:00–17:15, TU MA004
Strangeness production in pD interactions at ANKE/COSY — •Y. Valdau — Forschungszentrum Jülich, 52425 Jülich
ANKE is a magnetic spectrometer and detection system at an internal target position of COSY-Jülich. The device permits to momentum analyze ejectiles from hadronic interactions with forward emission angles around 0∘. A major goal of the experimental program at ANKE is the investigation of proton-induced strangeness production in the nuclear medium. The K+-production cross section in elementary pn collisions is an important input parameter for model calculations on K+-production in pA and AA interactions. Experimental data in the close to threshold region are not available yet and theoretical predictions give various numbers ranging from one to six for the ratio of total cross sections σn / σp depending on the underlying model. The ANKE spectrometer at COSY-Jülich has been used to measure K+ production in pD interactions at beam momenta of 2.055, 2.095, 2.65, 2.7, 2.83 and 3.46 GeV/c. For the extraction of σn / σp from the pD data at 2.65, 2.7 and 2.83 GeV/c, a naive phase-space approach has been used assuming that σD = σn + σp. Cross sections and missing mass spectra for proton-kaon correlations have been obtained, and a ratio σn /σp∼ 3−5 has been found. The analysis of data measured below the free nucleon-nucleon K+ production threshold as well as higher energy data will be presented. Supported by FZ-Jülich, DFG, WTZ.