EPJ

2022 Impact factor 2.7
EPJ A - Hadrons and Nuclei
Hadrons and Nuclei
Eur. Phys. J. A 2, 199-221

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 Communicated by B. Povh

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

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