Double pole S-matrix singularity in the continuum of 7Be

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dc.contributor.authorDavid Cardona Ochoa
dc.contributor.authorMarek Ploszajczak
dc.contributor.authorNicolas Michel
dc.date.accessioned2026-06-30T12:01:39Z
dc.date.available2026-06-30T12:01:39Z
dc.date.issued2026
dc.description.abstractThe double pole singularity of the S-matrix, the so-called exceptional point, associated with the 5/2− doublet of resonances in the spectrum of7Be 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.
dc.identifier.citationOchoa, D.C., Płoszajczak, M., Michel, N. and Wang, S., 2025. Double pole $ S $-matrix singularity in the continuum of $^ 7$ Be. arXiv preprint arXiv:2510.27293.
dc.identifier.urihttps://doi.org/10.5506/APhysPolBSupp.19.1-A15
dc.identifier.urihttps://hdl.handle.net/10566/24778
dc.language.isoen
dc.publisherJagiellonian University
dc.subjectWave functions
dc.subjectElectromagnetic transitions
dc.subjectExceptional points
dc.subjectMatrix singularity
dc.subjectPoint singularities
dc.subjectS-matrix
dc.titleDouble pole S-matrix singularity in the continuum of 7Be
dc.typeArticle

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