Doorway states in nuclear reactions as a manifestation of the "super-radiant" mechanism

Abstract

A mechanism is considered for generating doorway states and intermediate structure in low-energy nuclear reactions as a result of collectivization of widths of unstable intrinsic states coupled to common decay channels. At the limit of strong continuum coupling, the segregation of broad (''super-radiating") and narrow (''trapped") states occurs revealing the separation of direct and compound processes. We discuss the conditions for the appearance of intermediate structure in this process and doorways related to certain decay channels.

arXiv comment16 pages

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• Effective non-Hermitian Hamiltonian and continuum shell model
• Effective Coupling for Open Billiards
• A Simple Mode on a Highly Excited Background: Collective Strength and Damping in the Continuum
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Cited by in corpus (8)

• Quantum Chaos and Thermalization in Isolated Systems of Interacting Particles
• Super-Radiant Dynamics, Doorways, and Resonances in Nuclei and Other Open Mesoscopic Systems
• Interplay Between Disorder and Collective Coherent Response: Superradiance and Spectral Motional Narrowing in the Time Domain
• Wavelet signatures of $K$-splitting of the Isoscalar Giant Quadrupole Resonance in deformed nuclei from high-resolution (p,p${}^{\prime }$) scattering off ${}^{146,148,150}$Nd
• Resonance width distribution for open quantum systems
• Quantum signal transmission through a single-qubit chain
• Exit Doorway Model for Nuclear Breakup of Weakly Bound Projectiles
• Scattering Resonances in a Degenerate Fermi Gas