Darmstadt 2008 – wissenschaftliches Programm
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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, Pγ [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.