Köln 2004 – scientific programme
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HK: Physik der Hadronen und Kerne
HK 30: Electromagnetic and Hadronic Probes V
HK 30.5: Talk
Wednesday, March 10, 2004, 15:15–15:30, B
Investigation of the Deuteron Breakup p→d→→ ppn at High Momentum Transfer at ANKE/COSY* — •S. Yaschenko — PI II, Universität Erlangen–Nürnberg, Germany
The deuteron breakup reaction pd → ppn at GeV projectile energies in kinematics similar to backward elastic scattering pd → dp provides a new tool to investigate the pd dynamics at high–momentum transfer. The aim of a corresponding experimental program at the ANKE spectrometer at COSY–Jülich is to obtain insight into systems composed of more than two nucleons by measuring p→ d→ → ppn to provide a complete set of observables. A first experiment was carried out with an unpolarized deuterium cluster jet target at the internal COSY beam at energies Tp= 0.6, 0.7, 0.8, 0.95, 1.35, and 1.9 GeV. Events were selected by reconstructing the momenta of the two forward emitted protons with small excitation energy Epp< 3 MeV. The differential cross section of the breakup reaction, averaged over cm polar angles from 0∘ to 8∘ of the total momentum of the pp pairs, has been obtained. The results are compared with calculations based on a theoretical model previously applied to the pd → dp process. Recently, measurements at Tp= 1.1, 1.4, and 2.0 GeV with an unpolarized proton beam and at Tp= 0.5 and 0.8 GeV with a polarized beam were carried out. The current status of data analysis, the first results of measurements of the vector analyzing power at 0.5 and 0.8 GeV and a comparison with theoretical predictions are presented. * supported by FZ-Jülich, BMBF, WTZ.