Mainz 2012 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 39: Hadronenstruktur und -spektroskopie
HK 39.5: Talk
Thursday, March 22, 2012, 17:45–18:00, RW 2
Study of the pn→K+nΛ reaction near threshold — •Yury Valdau — Forschungszentrum Jülich, Leo-Brandt-Strasse, 52428 Jülich, Germany — Helmholtz-Institut für Strahlen- und Kernphysik, Nussallee 14-16, 53115 Bonn, Germany
A significant data base on kaon production in pp collisions has been accumulated over the last few years. In contrast, there is very little information about close-to-threshold K+ production in pn interactions.
At ANKE-COSY the energy dependence of K+Λ production in quasi-free pn interactions in a deuterium target has been studied during a dedicated beam-time in March 2011. In this measurement, two Silicon Tracking Telescopes (STTs) were used to identify spectator protons and determine the excess energy. The proton beam momentum (2.6 GeV/c) was optimized to favour in the STT only protons associated with the pn→ K+nΛ reaction. The identification in coincidence of a single K+ in the ANKE positive detector system is sufficient for the total cross section determination. The kaon identification at ANKE was done using the so-called delayed-veto technique, which allows measurements of inclusive K+ production even if the background from π+ and protons is 105 higher. In addition to data on the pn→ K+ n Λ reaction, calibration data on a hydrogen target will allow one to judge the feasibility of studying the nΛ final-state interaction using the ANKE magnetic spectrometer.
The status of the analysis and experimental results will be presented.
Supported by the COSY–FFE program.