Radiative capture reactions and spectroscopy of multipolar anions in the framework of GamowShell Model.

Abstract : Small open quantum systems, whose properties are profoundly affected by the environment of continuumstates, are intensely studied in various fields of Physics: nuclear physics, atomic and molecular physics,quantum optics, etc. These different many-body systems, in spite of their specific features, have genericproperties which are common to all weakly bound or unbound systems close to the threshold. Couplingto the continuum is essential to describe the low-energy nuclear reactions of astrophysical interest, theformation of halo states in nuclei, atomic clusters and dipolar anions, or the near-threshold two neutronand alpha particle correlations (clustering). Recently, the open quantum system extension of the nuclearshell model, the Gamow shell model (GSM), based on the Berggren ensemble, has been applied successfullyfor the description of resonant states spectra in atomic nuclei. The coupled-channel formulation of theGSM (GSM-CC) allows to describe various low-energy nuclear reactions.In this work, the GSM-CC is formulated and applied for the description of proton/neutron radiativecapture reactions of astrophysical interest, such as: 17F(p, γ)18Ne, 7Be(p, γ)8B and 7Li(n, γ)8Li. Moreover,for the first time, the GSM has been applied in atomic physics for the description of spectra of dipolaranions. Systematic investigation of the hydrogen cyanide dipolar anion (HCN−) allowed to identify thecollective bands of states both in the strong coupling regime, for weakly bound halo states, and in the weakcoupling regime above the dissociation threshold. In the strong coupling regime, KJ = 0 anion a rotationalband has been found. Above the threshold, KJ quantum number is not conserved. Resonances in thisregime form rotational bands according to the angular momentum of the rotating molecule, whereas thebandhead energies and the lifetimes depend predominantly on the external electron wave function.
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Submitted on : Thursday, December 4, 2014 - 4:20:27 PM
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K. Fossez. Radiative capture reactions and spectroscopy of multipolar anions in the framework of GamowShell Model.. Nuclear Theory [nucl-th]. Université de Caen Basse Normandie, 2014. English. ⟨tel-01091108⟩

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