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HK: Fachverband Hadronen und Kerne
HK 11: Few-body physics
HK 11.2: Vortrag
Montag, 16. März 2009, 14:30–14:45, H-ZO 100
Deuteron-Proton Breakup as a Probe of Three-Nucleon System Dynamics — •Stanislaw Kistryn1, Elzbieta Stephan2, and Nasser Kalantar-Nayestanaki3 — 1Jagiellonian University, PL-30059 Krakow, Poland — 2University of Silesia, PL-4007 Katowice, Poland — 3Kernfysisch Versneller Instituut, NL-9747 Groningen,
Modern nucleon-nucleon (NN) interaction models can be probed quantitatively in the three-nucleon (3N) environment by means of rigorous technique of solving the Faddeev equations and comparing the calculated observables with the measured ones. It has been found that a proper description of the experimental data cannot be achieved with the use of NN forces alone. This indicates a necessity of including additional dynamics: subtle effects of suppressed degrees of freedom, introduced by means of genuine 3N forces. Also other contributions (Coulomb force, relativistic effects) have to be taken into account.
A large set of high precision, exclusive cross-section data for the 1H(d→,pp)n breakup reaction at 130 MeV deuteron energy, contribute significantly to constrain the physical assumptions underlying the theoretical interaction models. Comparison of nearly 1800 cross-section data points with the predictions using nuclear interactions generated in various ways (semi-phenomenological meson exchanges, coupled barion channels approach, chiral perturbation theory), allowed to establish for the first time a clear evidence of importance of the 3N forces in the breakup process. Moreover, the results confirmed predictions of sizable Coulomb force influences in this reaction. Studies on the importance of the relativistic effects are under way.