Darmstadt 2008 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 7: Theorie

HK 7.4: Talk

Monday, March 10, 2008, 15:00–15:15, 2F

Dibaryon concept for basic two- and three-nucleon forces at intermediate and short ranges: theory vs. experiment — •Vladimir Kukulin¹, Vladimir Pomerantsev¹, Igor Obukhovsky¹, Peter Grabmayr², and Amand Faessler¹ — ¹Institut für Theoretische Physik, Universität Tübingen — ²PhysikaIische Institut, Universität Tübingen

Quite evident and numerous discrepancies between modern high-quality experimental data and careful predictions of conventional nuclear force models have been found in recent years for many observables in two and few-nucleon systems in such processes like pp→ ppγ, d(γ,n^→)p, ³He(e,e′pp), p+d → ³He + π⁰π⁰ etc. Moreover, some of the basic concepts of the conventional force models, being treated more consistently, occured to be invalid. These discrepancies and the basic QCD arguments motivated our group to develop an alternative concept for nuclear force and 3N-interactions at intermediate and short distances, based on generation of an intermediate six-quark dressed dibaryon. The main agent stabilizing the above dibaryon is the strong scalar field surrounding the six-quark bag which forms a multiquark core of the dressed dibaryon. This new force concept has been demonstrated to result in strong intermediate-range attraction in NN channel and make it possible to describe NN phase shifts (in large energy range) and deuteron properties even a bit better than with most accurate modern NN potential models. The new model leads to numerous important implications for many aspects of nuclear structure and hadronic reactions which are planned to be discussed in present talk.