dorsal/arxiv
View SchemaMultinucleon Mechanisms in ($\gamma$,N) and ($\gamma$,NN) Reactions
| Authors | J. Ryckebusch, L. Machenil, M. Vanderhaeghen, V. Van der Sluys, M. Waroquier |
|---|---|
| Categories | |
| ArXiv ID | nucl-th/9310027 |
| URL | https://arxiv.org/abs/nucl-th/9310027 |
| DOI | 10.1103/PhysRevC.49.2704 |
Abstract
The similarities in the experimental indications for multinucleon mechanisms in $(\gamma,p)$ and $(e,e'p)$ processes are pointed out. For both types of reactions, the substantial role of two-nucleon emission processes for transitions to high excitation energies in the residual nucleus is stressed. A microscopic model for the calculation of the two-body knockout contributions to the inclusive $(\gamma,N)$ reaction is presented. It is based on an unfactorized formalism for the calculation of electromagnetically induced two-nucleon emission cross sections. The model is shown to yield a reasonable description of the overall behaviour of the $^{12}$C$(\gamma,p)$ and $^{12}$C$(\gamma,n)$ data at high excitation energies in the residual nucleus. In the calculations effects from non-resonant and resonant pion exchange currents are included. Photoabsorption on these currents are predicted to produce the major contributions to the exclusive $^{16}$O$(\gamma,n_0)^{15}$O process at photonenergies above the pion threshold. Double differential cross sections for photon induced $pp$ and $pn$ emission from $^{16}$O are calculated and compared with the data.
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"abstract": "The similarities in the experimental indications for multinucleon mechanisms\nin $(\\gamma,p)$ and $(e,e\u0027p)$ processes are pointed out. For both types of\nreactions, the substantial role of two-nucleon emission processes for\ntransitions to high excitation energies in the residual nucleus is stressed. A\nmicroscopic model for the calculation of the two-body knockout contributions to\nthe inclusive $(\\gamma,N)$ reaction is presented. It is based on an\nunfactorized formalism for the calculation of electromagnetically induced\ntwo-nucleon emission cross sections. The model is shown to yield a reasonable\ndescription of the overall behaviour of the $^{12}$C$(\\gamma,p)$ and\n$^{12}$C$(\\gamma,n)$ data at high excitation energies in the residual nucleus.\nIn the calculations effects from non-resonant and resonant pion exchange\ncurrents are included. Photoabsorption on these currents are predicted to\nproduce the major contributions to the exclusive $^{16}$O$(\\gamma,n_0)^{15}$O\nprocess at photonenergies above the pion threshold. Double differential cross\nsections for photon induced $pp$ and $pn$ emission from $^{16}$O are calculated\nand compared with the data.",
"arxiv_id": "nucl-th/9310027",
"authors": [
"J. Ryckebusch",
"L. Machenil",
"M. Vanderhaeghen",
"V. Van der Sluys",
"M. Waroquier"
],
"categories": [
"nucl-th"
],
"doi": "10.1103/PhysRevC.49.2704",
"title": "Multinucleon Mechanisms in ($\\gamma$,N) and ($\\gamma$,NN) Reactions",
"url": "https://arxiv.org/abs/nucl-th/9310027"
},
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