Physics – Nuclear Physics – Nuclear Theory
Scientific paper
1993-07-02
Phys.Lett. B316 (1993) 17-22
Physics
Nuclear Physics
Nuclear Theory
10 pages, 5 figures in seperate postscript file, Submitted to Phys. Lett. B. - INW9306II
Scientific paper
10.1016/0370-2693(93)90650-7
Calculations have been performed for the $^{16}$O($\gamma$,pn) and the $^{16}$O($\gamma$,pp) reaction in the photon-energy range $E_{\gamma}$ = 60-300 MeV. Besides the contribution from the more common photoabsorption on the pionic degrees of freedom, we have investigated the influence of heavier meson exchange ($\rho, \sigma, \omega$) and intermediate $\Delta$ creation with $\pi$ and $\rho$ exchange. Whereas the $\pi$ meson is found to set the main trends, the $\rho$ meson is found not to be discardable in a theoretical description of the ($\gamma$,pn) reaction. The incorporation of an energy dependence and a decay width in the $\Delta$ propagator is observed to be essential in order to arrive at a more realistic description of ($\gamma$,NN) reactions at higher photon energies.
Machenil L.
Ryckebusch Jan
Vanderhaeghen Marc
Waroquier Michel
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