Bochum 2009 – scientific programme
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HK: Fachverband Hadronen und Kerne
HK 11: Few-body physics
HK 11.3: Talk
Monday, March 16, 2009, 14:45–15:00, H-ZO 100
Analyzing Powers of the Deuteron-Proton Breakup in a Wide Phase Space Region — •Elzbieta Stephan1, Stanislaw Kistryn2, and Nasser Kalantar-Nayestanaki3 — 1University of Silesia, PL-4007 Katowice — 2Jagiellonian University, PL-30059 Krakow — 3Kernfysisch Versneller Instituut, NL-9747 Groningen
Deuteron-proton breakup can serve as a very rich testing ground for modern calculations based on model nucleon-nucleon interactions and including also subtle effects of the so-called three-nucleon force (3NF). In the case of experiment exploring a significant part of the phase space, data obtained for continuum of final states constitute a large base for comparisons with theoretical predictions. Moreover, studies with transversally polarized deuterons give access to two vector and three tensor analyzing powers, some of which vanish in the case of the elastic scattering process.
A dedicated experiment has been performed at KVI Groningen, with the use of 130 MeV polarized deuteron beam and high acceptance position-sensitive detection system. About 800 data points have been analyzed for each spin observable: vector Ax, Ay and tensor Axx, Axy, Ayy analyzing powers of the 1H(d→,pp)n breakup reaction. Theoretical predictions generally describe analyzing power data quite well and the quality of description provided by various approaches is rather similar. There are, however, configurations where the agreement between the data and theory is not so satisfactory. These discrepancies are not always cured by inclusion of 3NF, what indicates incompleteness of the treatment of the spin part of three nucleon system dynamics.