Springer LINK: The European Physical Journal A - Abstract Volume 2 Issue 2 (1998) pp 199-221

The European Physical Journal A

ISSN: 1434-6001 (printed version)
ISSN: 1434-601X (electronic version)

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Abstract Volume 2 Issue 2 (1998) pp 199-221

hadron physics: Low- and intermediate-energy nucleon-nucleon interactions and the analysis of deuteron photodisintegration within the dispersion relation technique

A.V. Anisovich, V.A. Sadovnikova

Petersburg Nuclear Physics Institute, Gatchina, St.Petersburg 188350, Russia

Received: 24 November 1997

Abstract: Nucleon-nucleon interactions in the region of the nucleon kinetic energies up to 1000 MeV are analysed together with the reaction <Gamma>d -> pn in the photon energy range up to E_<Gamma>=400 MeV. The following nucleon-nucleon s-channel partial amplitudes are reconstructed in the dispersion relation N/D method: ¹S₀, ³S₁-³D₁, ³P₀, ¹P₁, ³P₁, ³P₂, ¹D₂, ³D₂ and ³F₃. Correspondingly, the dispersive representation of partial amplitudes N<Delta> -> pn, NN^* -> pn and NN<pi> -> pn is given and parameters which determine these two baryon amplitudes are found. Basing on that, we have performed parameter-free calculation of the amplitude <Gamma>d -> pn, taking into account: (i) pole diagram, (ii) nucleon-nucleon final-state rescattering <Gamma>d -> pn -> pn, and (iii) inelastic final-state rescatterings <Gamma>d -> N<Delta>(1232) -> pn, <Gamma>d -> NN^*(1400) -> pn and <Gamma>d -> NN<pi> -> pn. The <Gamma>d -> pn partial amplitudes for the above-mentioned channels are found. It is shown that the process <Gamma>d -> pn -> pn is significant for the waves ¹S₀, ³P₀, ³P₁, at E_<Gamma> = 50-100 MeV, while <Gamma>d -> N<Delta> -> pn dominates for the waves ³P₂, ¹D₂, ³F₃ at E_<Gamma> > 300 MeV. Meson exchange current contributions into the deuteron disintegration are estimated: they are significant at E_<Gamma> = 100-400 MeV.

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Communicated by B. Povh

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