dorsal/arxiv
View SchemaA Simple Mode on a Highly Excited Background: Collective Strength and Damping in the Continuum
| Authors | V. V. Sokolov, V. G. Zelevinsky |
|---|---|
| Categories | |
| ArXiv ID | nucl-th/9704055 |
| URL | https://arxiv.org/abs/nucl-th/9704055 |
| DOI | 10.1103/PhysRevC.56.311 |
| Journal | Phys.Rev.C56:311-323,1997 |
Abstract
Simple states, such as isobaric analog states or giant resonances, embedded into continuum are typical for mesoscopic many-body quantum systems. Due to the coupling to compound states in the same energy range, a simple mode acquires a damping width ("internal" dynamics). When studied experimentally with the aid of various reactions, such states reveal enhanced cross sections in specific channels at corresponding resonance energies ("external" dynamics which include direct decay of a simple mode and decays of intrinsic compound states through their own channels). We consider the interplay between internal and external dynamics using a general formalism of the effective nonhermitian hamiltonian and looking at the situation both from "inside" (strength functions and spreading widths) and from "outside" (S-matrix, cross sections and delay times). The restoration of isospin purity and disappearance of the collective strength of giant resonances at high excitation energy are discussed as important particular manifestations of this complex interplay.
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"abstract": "Simple states, such as isobaric analog states or giant resonances, embedded\ninto continuum are typical for mesoscopic many-body quantum systems. Due to the\ncoupling to compound states in the same energy range, a simple mode acquires a\ndamping width (\"internal\" dynamics). When studied experimentally with the aid\nof various reactions, such states reveal enhanced cross sections in specific\nchannels at corresponding resonance energies (\"external\" dynamics which include\ndirect decay of a simple mode and decays of intrinsic compound states through\ntheir own channels). We consider the interplay between internal and external\ndynamics using a general formalism of the effective nonhermitian hamiltonian\nand looking at the situation both from \"inside\" (strength functions and\nspreading widths) and from \"outside\" (S-matrix, cross sections and delay\ntimes). The restoration of isospin purity and disappearance of the collective\nstrength of giant resonances at high excitation energy are discussed as\nimportant particular manifestations of this complex interplay.",
"arxiv_id": "nucl-th/9704055",
"authors": [
"V. V. Sokolov",
"V. G. Zelevinsky"
],
"categories": [
"nucl-th"
],
"doi": "10.1103/PhysRevC.56.311",
"journal_ref": "Phys.Rev.C56:311-323,1997",
"title": "A Simple Mode on a Highly Excited Background: Collective Strength and Damping in the Continuum",
"url": "https://arxiv.org/abs/nucl-th/9704055"
},
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