3 papers
nucl-th2026
Search for the Double Poles of the Scattering Matrix in Light Nuclei
David Cardona Ochoa, Marek Płoszajczak, Nicolas Michel
Exceptional points (EPs) are non-Hermitian degeneracies at which two eigenvalues and their eigenvectors coalesce, producing a defective Hamiltonian and a double pole of the -mat…
nucl-th2025
Gamow shell model description of exceptional point in Li
David Cardona Ochoa, Marek Płoszajczak, Nicolas Michel
We report the first identification of an exceptional point (EP) within the Gamow Shell Model in the Coupled Channels representation (GSM-CC). In the spectrum of Li, an EP is…
nucl-th2025
Double pole -matrix singularity in the continuum of Be
David Cardona Ochoa, Marek Płoszajczak, Nicolas Michel +1
The double pole singularity of the -matrix, the so-called exceptional point, associated with the doublet of resonances in the spectrum of Be has been identified in…