dorsal/arxiv
View SchemaLong-Range Correlations and the Momentum Distribution in Nuclei
| Authors | K. Amir-Azimi-Nili, H. Müther, L. D. Skouras, A. Polls |
|---|---|
| Categories | |
| ArXiv ID | nucl-th/9603041 |
| URL | https://arxiv.org/abs/nucl-th/9603041 |
| DOI | 10.1016/0375-9474(96)00142-X |
| Journal | Nucl.Phys. A604 (1996) 245-262 |
Abstract
The influence of correlations on the momentum distribution of nucleons in nuclei is evaluated starting from a realistic nucleon-nucleon interaction. The calculations are performed directly for the finite nucleus $\,^{16}$O making use of the Green's function approach. The emphasis is focused on the correlations induced by the excitation modes at low energies described within a model-space of shell-model configurations including states up to the sdg shell. Our analysis demonstrates that these long-range correlations do not produce any significant enhancement of the momentum distribution at high missing momenta and low missing energies. This is in agreement with high resolution $(e,e'p)$ experiments for this nucleus. We also try to simulate the corresponding effects in large nuclei by quenching the energy-spacing between single-particle orbits. This yields a sizable enhancement of the spectral function at large momenta and small energy. Such behavior could explain the deviation of the momentum distribution from the mean field prediction, which has been observed in $(e,e'p)$ experiments on heavy nuclei like $^{208}$Pb.
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"abstract": "The influence of correlations on the momentum distribution of nucleons in\nnuclei is evaluated starting from a realistic nucleon-nucleon interaction. The\ncalculations are performed directly for the finite nucleus $\\,^{16}$O making\nuse of the Green\u0027s function approach. The emphasis is focused on the\ncorrelations induced by the excitation modes at low energies described within a\nmodel-space of shell-model configurations including states up to the sdg shell.\nOur analysis demonstrates that these long-range correlations do not produce any\nsignificant enhancement of the momentum distribution at high missing momenta\nand low missing energies. This is in agreement with high resolution $(e,e\u0027p)$\nexperiments for this nucleus. We also try to simulate the corresponding effects\nin large nuclei by quenching the energy-spacing between single-particle orbits.\nThis yields a sizable enhancement of the spectral function at large momenta and\nsmall energy. Such behavior could explain the deviation of the momentum\ndistribution from the mean field prediction, which has been observed in\n$(e,e\u0027p)$ experiments on heavy nuclei like $^{208}$Pb.",
"arxiv_id": "nucl-th/9603041",
"authors": [
"K. Amir-Azimi-Nili",
"H. M\u00fcther",
"L. D. Skouras",
"A. Polls"
],
"categories": [
"nucl-th"
],
"doi": "10.1016/0375-9474(96)00142-X",
"journal_ref": "Nucl.Phys. A604 (1996) 245-262",
"title": "Long-Range Correlations and the Momentum Distribution in Nuclei",
"url": "https://arxiv.org/abs/nucl-th/9603041"
},
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