Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On description of the direct nucleon decay of giant resonances   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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The categories of this paper are: astro-ph
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The categories of this paper are: hep-ph
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The categories of this paper are: stat
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The categories of this paper are: q-fin
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The categories of this paper are: cmp-lg
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The categories of this paper are: hep-lat
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The categories of this paper are: nucl-ex
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The categories of this paper are: quant-ph
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The categories of this paper are: dg-ga
35
The categories of this paper are: mtrl-th
37
The categories of this paper are: supr-con
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The categories of this paper are: math-ph
31
The categories of this paper are: ao-sci
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The categories of this paper are: gr-qc
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The categories of this paper are: cond-mat
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The categories of this paper are: adap-org