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Abstract:

A model for collective mode damping in nuclei is devised in the frame of a theory of irreversible evolution. The decay width of a fast nuclear vibration, originated in its coupling to the remaining nuclear degrees of freedom, is calculated in a dynamical fashion. To this aim, a set of equations is proposed that describes the simultaneous dynamics of the oscillation or its associated array of bosons and of the interacting fermions that play the role of a heat reservoir. These are, respectively, a quantal master equation and modified kinetic one. The two of them exhibit their mutual coupling in the non-Hermitian terms of their generators of motion. The equations are worked out in detail in (a) the weak-coupling approximation plus (b) the very-close-to-equilibration regime plus (c) the energy-conserving description of intermediate processes. With hypothesis (c) the heat bath can be regarded as lying in a steady state at all times and the master equation is solved for different temperatures and phonon energies. The damping width of the oscillations is thus quantitatively predicted. [NUCLEAR STRUCTURE Damping width. High-frequency collective modes. Nonstationary fermionic heat reservoir. Coupled dynamics. Quantal master equation. Modified BBGKY hierarchy. Modified kinetic equation. Single-particle lifetime. Temperature-dependent transition rates. Thermal equilibration. Irreversible evolution with effective collision frequency or relaxation time.] © 1984 The American Physical Society.

Registro:

Documento: Artículo
Título:Quantal Brownian motion in stationary and nonstationary fermionic reservoirs
Autor:Hernandez, E.S.; Dorso, C.O.
Filiación:Departamento de Física, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, 1428 Buenos Aires, Aires, Argentina
Año:1984
Volumen:29
Número:4
Página de inicio:1510
Página de fin:1522
DOI: http://dx.doi.org/10.1103/PhysRevC.29.1510
Título revista:Physical Review C
ISSN:05562813
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_05562813_v29_n4_p1510_Hernandez

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Citas:

---------- APA ----------
Hernandez, E.S. & Dorso, C.O. (1984) . Quantal Brownian motion in stationary and nonstationary fermionic reservoirs. Physical Review C, 29(4), 1510-1522.
http://dx.doi.org/10.1103/PhysRevC.29.1510
---------- CHICAGO ----------
Hernandez, E.S., Dorso, C.O. "Quantal Brownian motion in stationary and nonstationary fermionic reservoirs" . Physical Review C 29, no. 4 (1984) : 1510-1522.
http://dx.doi.org/10.1103/PhysRevC.29.1510
---------- MLA ----------
Hernandez, E.S., Dorso, C.O. "Quantal Brownian motion in stationary and nonstationary fermionic reservoirs" . Physical Review C, vol. 29, no. 4, 1984, pp. 1510-1522.
http://dx.doi.org/10.1103/PhysRevC.29.1510
---------- VANCOUVER ----------
Hernandez, E.S., Dorso, C.O. Quantal Brownian motion in stationary and nonstationary fermionic reservoirs. 1984;29(4):1510-1522.
http://dx.doi.org/10.1103/PhysRevC.29.1510