The Hoyle state and its relatives

3rd International Workshop on "State of the Art in Nuclear Cluster Physics"

Neff, Thomas^1 ; Feldmeier, Hans^1,2

GSI Helmholtzzentrum für Schwerionenforschung GmbH and ExtreMe Matter Institute EMMI, Planckstraße 1, Darmstadt

64291, Germany^1

Frankfurt Institute for Advanced Studies, Max-von-Laue Straße 1, Frankfurt

60438, Germany^2

关键词: Bound state;    Cluster models;    Many body wave functions;    Model spaces;    R-matrix method;    Scattering state;    Transition strengths;    Triangular grid;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/569/1/012062/pdf
DOI  :  10.1088/1742-6596/569/1/012062

来源: IOP

【 摘 要 】

The Hoyle state and other resonances in the continuum above the 3 α threshold in12C are studied in a microscopic cluster model. Whereas the Hoyle state is a very sharp resonance and can be treated reasonably well in bound state approximation, the other higher lying states require a proper treatment of the continuum. The model space consists of an internal region with 3 α particles on a triangular grid and an external region consisting of the8Be ground state and excited (pseudo)-states of8Be with an additional a. The microscopic R-matrix method is used to match the many-body wave function to the asymptotic Coulomb behavior of bound states, Gamow states and scattering states.8Be-α phase shifts are analyzed and resonance properties like radii and transition strengths are investigated.