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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Quasiparticle nature of excited states in random-phase approximation

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Chimanski, V, E. ; Carlson, V, B. ; Capote, R. [1] ; Koning, A. J. [1]
Total Authors: 4
[1] Chimanski, E., V, IAEA, NAPC Nucl Data Sect, A-1400 Vienna - Austria
Total Affiliations: 1
Document type: Journal article
Source: Physical Review C; v. 99, n. 1 JAN 8 2019.
Web of Science Citations: 0

Quantum models of nuclear reactions require an effective way of taking into account the complex coupling of the components of different excited states as well as the nuclear residual interactions of the composite system. This is usually achieved with the use of distributions giving nonuniform weights for each of the modes involved. The response function of the quantum model permits the inclusion of the residual interaction and thus a unified description of collective and single-particle excitations. We analyze the particle-hole nature of the RPA modes of the response function in the context of multistep direct (MSD) nuclear reactions. The energy distribution of the particle-hole states that contribute to the response function is studied. Although many states make small contributions to the low-energy collective states, we show that the energy distribution of the higher-energy states is concentrated around the energies of the noninteracting components. The spreading energy of the strength function is determined for different nuclei, and a general fit accounting for both the collective and noncollective parts of the spectra is proposed. In addition we also test the randomness assumption commonly applied in models of MSD reactions. (AU)

FAPESP's process: 16/07398-8 - Extension of the quantum formalism for direct multistep reactions
Grantee:Emanuel Vicente Chimanski
Support type: Scholarships in Brazil - Doctorate
FAPESP's process: 17/13693-5 - Comparison of preequilibrium nuclear reaction calculations in multistep direct reaction models
Grantee:Emanuel Vicente Chimanski
Support type: Scholarships abroad - Research Internship - Doctorate
FAPESP's process: 17/05660-0 - Theoretical studies of the structure and reactions of exotic nuclei and many-body systems
Grantee:Brett Vern Carlson
Support type: Research Projects - Thematic Grants