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HK: Fachverband Physik der Hadronen und Kerne

HK 34: Postersitzung

HK 34.73: Poster

Donnerstag, 13. März 2008, 14:00–16:00, Poster C3

New s-channel e.-m. currents in the deuteron induced by intermediate dibaryon generation — •Igor Obukhovsky¹, Vladimir Kukulin¹, Vladimir Pomerantsev¹, Peter Grabmayr², and Amand Faessler¹ — ¹Institut für Theoretische Physik, Universität Tübingen, D-72076 Tübingen — ²Physikalisches Institüt, Universität Tübingen, D-72076 Tübingen

The model for NN force induced by generation of an intermediate dibaryon dressed with σ- and other meson fields developed by present authors in previous years is applied to description of some important e.-m. observables in deuteron and two-nucleon system. The model leads to the inevitable new s-channel meson-exchange currents in accordance to general rules of quantum theory (new degree of freedom, i.e. dibaryon, procreates a respective new current). More definitely, we have analyzed a few key e.-m. processes with deuteron and NN system, like n^→+p → d+γ^→ (the circular polarization of γ-quanta, P_γ [1]), d(γ ,n^→)p (the neutron spin polarization, P′_y, [2]) and also all the electromagnetic form factors of the deuteron. Our calculations have shown that the dibaryon induced exchange currents give important contributions to e.-m. observables in NN system and make it possible to describe quantitatively those deuteron observables which could not be explained within the conventional two-body current framework.

1. V.I. Kukulin, I.T. Obukhovsky, V.N. Pomerantsev, P. Grabmayr, and A. Faessler, Phys. Rev. C 74, 064005 (2006).

2. V.I. Kukulin, I.T. Obukhovsky, V.N. Pomerantsev, P. Grabmayr, and A. Faessler, Phys. Rev. C, (2008) in press.