dorsal/arxiv
View SchemaEffects of the final-state interaction in ($\gamma$,pn) and ($\gamma$,pp) processes
| Authors | J. Ryckebusch, M. Vanderhaeghen, L. Machenil, M. Waroquier |
|---|---|
| Categories | |
| ArXiv ID | nucl-th/9307004 |
| URL | https://arxiv.org/abs/nucl-th/9307004 |
| DOI | 10.1016/0375-9474(94)90362-X |
| Journal | Nucl.Phys. A568 (1994) 828-854 |
Abstract
A model is presented to describe electromagnetically induced two-nucleon emission processes in a shell-model picture. Distortions in the outgoing nucleon waves are accounted for by performing a partial-wave expansion in a real mean-field potential. The antisymmetry condition for the A-body wavefunctions is shown to be naturally preserved. The model is used to calculate ($\gamma$,pn) and ($\gamma$,pp) cross sections off the target nuclei $^{16}$O and $^{12}$C for photon energies ranging from 50 MeV up to the $\bigtriangleup$(1232) isobar threshold. Effects due to the pionic currents and intermediate $\bigtriangleup$ creation are implemented. The impact of the distortions due to the interaction of the outgoing nucleon waves with the (A-2) core is examined. Hadronic form factors are introduced to regularize the $\pi$NN vertices and the sensitivity of the cross section to the pion cut-off mass is examined. The relative contribution of the ($\gamma$,pp) and the ($\gamma$,pn) channel to the total photoabsorption strength is discussed. Further, the photon energy dependence of the ($\gamma$,pp)/($\gamma$,pn) ratio is investigated.
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"abstract": "A model is presented to describe electromagnetically induced two-nucleon\nemission processes in a shell-model picture. Distortions in the outgoing\nnucleon waves are accounted for by performing a partial-wave expansion in a\nreal mean-field potential. The antisymmetry condition for the A-body\nwavefunctions is shown to be naturally preserved.\n The model is used to calculate ($\\gamma$,pn) and ($\\gamma$,pp) cross sections\noff the target nuclei $^{16}$O and $^{12}$C for photon energies ranging from 50\nMeV up to the $\\bigtriangleup$(1232) isobar threshold. Effects due to the\npionic currents and intermediate $\\bigtriangleup$ creation are implemented. The\nimpact of the distortions due to the interaction of the outgoing nucleon waves\nwith the (A-2) core is examined. Hadronic form factors are introduced to\nregularize the $\\pi$NN vertices and the sensitivity of the cross section to the\npion cut-off mass is examined. The relative contribution of the ($\\gamma$,pp)\nand the ($\\gamma$,pn) channel to the total photoabsorption strength is\ndiscussed. Further, the photon energy dependence of the\n($\\gamma$,pp)/($\\gamma$,pn) ratio is investigated.",
"arxiv_id": "nucl-th/9307004",
"authors": [
"J. Ryckebusch",
"M. Vanderhaeghen",
"L. Machenil",
"M. Waroquier"
],
"categories": [
"nucl-th"
],
"doi": "10.1016/0375-9474(94)90362-X",
"journal_ref": "Nucl.Phys. A568 (1994) 828-854",
"title": "Effects of the final-state interaction in ($\\gamma$,pn) and ($\\gamma$,pp) processes",
"url": "https://arxiv.org/abs/nucl-th/9307004"
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