dorsal/arxiv
View SchemaOn description of the direct nucleon decay of giant resonances
| Authors | G. A. Chekomazov, S. E. Muraviev, M. H. Urin |
|---|---|
| Categories | |
| ArXiv ID | nucl-th/9610046 |
| URL | https://arxiv.org/abs/nucl-th/9610046 |
| DOI | 10.1016/0375-9474(96)00067-X |
| Journal | Nucl.Phys. A599 (1996) 259c-264c |
Abstract
A semimicroscopical approach is formulated to describe the direct nucleon decay of various giant resonances in intermediate and heavy mass spherical nuclei. The approach consists in: (i) the exact continuum-RPA calculations for amplitudes of the reactions accompanied by excitation and the nucleon decay of the collective particle-hole states (doorway states); (ii) the Breit-Wigner parametrization of the RPA reaction-amplitudes in the vicinity of the giant giant-resonance energy and evaluation of the doorway-state parameter (the energy, entrance and partial nucleon, escape widths); (iii) the phenomenological consideration for the doorway-state coupling to many-particle configurations with the use of reasonable statistical assumptions and derivation on this base the expressions for the energy-averaged reaction amplitudes. The nuclear mean field and quasiparticle interaction are the input quantities for calculations. Examples of description for the direct nucleon decay of a number of giant resonances in the $^{208}Pb$ parent nucleus are given together with the comparison with corresponding experimental data.
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"abstract": "A semimicroscopical approach is formulated to describe the direct nucleon\ndecay of various giant resonances in intermediate and heavy mass spherical\nnuclei. The approach consists in: (i) the exact continuum-RPA calculations for\namplitudes of the reactions accompanied by excitation and the nucleon decay of\nthe collective particle-hole states (doorway states); (ii) the Breit-Wigner\nparametrization of the RPA reaction-amplitudes in the vicinity of the giant\ngiant-resonance energy and evaluation of the doorway-state parameter (the\nenergy, entrance and partial nucleon, escape widths); (iii) the\nphenomenological consideration for the doorway-state coupling to many-particle\nconfigurations with the use of reasonable statistical assumptions and\nderivation on this base the expressions for the energy-averaged reaction\namplitudes. The nuclear mean field and quasiparticle interaction are the input\nquantities for calculations. Examples of description for the direct nucleon\ndecay of a number of giant resonances in the $^{208}Pb$ parent nucleus are\ngiven together with the comparison with corresponding experimental data.",
"arxiv_id": "nucl-th/9610046",
"authors": [
"G. A. Chekomazov",
"S. E. Muraviev",
"M. H. Urin"
],
"categories": [
"nucl-th"
],
"doi": "10.1016/0375-9474(96)00067-X",
"journal_ref": "Nucl.Phys. A599 (1996) 259c-264c",
"title": "On description of the direct nucleon decay of giant resonances",
"url": "https://arxiv.org/abs/nucl-th/9610046"
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