Measurement of Subthreshold K + Production in pA Collisions with ANKE

Le résumé fourni par la source

The magnetic spectrometer ANKE has been put into operation in spring 1998 at the cooler synchrotron COSY-Julich. ANKE allows to momentum analyze ejectiles emitted from an internal target at forward angles approximate to 0 degrees with high angular acceptance Delta Omega approximate to 50 msr. A primary goal of the physics program with ANKE is the investigation of K (+) production in proton-nucleus collisions at energies around and far below the free nucleon-nucleon threshold at T = 1.58 GeV. The measurements have been performed with C, Cu and Au targets at various energies in the range T = 1.0,..., 2.3 GeV. The major experimental challenge is that the kaon-to-background ratio is as low as similar to 10(-6) at the lowest energy. Data on the target-mass dependence of the production cross sections for kaon momenta p(K+) = 150,..., 510 MeV/c at beam energies of T = 1.0 and 2.3 GeV are presented.

Ce résumé expose les affirmations des auteurs. BNTIC ne l’interprète pas comme une validation indépendante des résultats.