Double Pole \(S\)-matrix Singularity in the Continuum of \(^7\mathrm {Be}\)
Abstract
The double pole singularity of the \(S\)-matrix, the so-called exceptional point, associated with the \(5/2^-\) doublet of resonances in the spectrum of \(^{7}\mathrm {Be}\) has been identified in the framework of the Gamow shell model. The exceptional point singularity is demonstrated by the coalescence of wave functions and spectral functions of the two resonances, as well as by the singular behavior of spectroscopic factors and electromagnetic transitions. Abstract Published by the Jagiellonian University 2026 authors
Fields of Study & Subjects
Quantum Mechanics and Non-Hermitian Physics
Spectral Theory in Mathematical Physics
Mathematical functions and polynomials
Publication details
- Journal / source
- Acta Physica Polonica B Proceedings Supplement
- Publisher
- Jagiellonian University
- Volume
- 19
- Issue
- 1
- Pages
- 1–1
- Publication date
- 31 March 2026
- Language
- EN