The Gamow shell model locates a double pole S-matrix singularity (exceptional point) for the 5/2^- resonances in 7Be, shown by coalescing wave functions, spectral functions, and singular spectroscopic factors plus electromagnetic transitions.
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A centered first-jet basis for neighboring quasinormal modes in finite time windows replaces the ill-conditioned sum of two resolved damped exponentials with a carrier plus t exp(-i omega_c t) term when the dimensionless splitting eta is small.
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Double pole $S$-matrix singularity in the continuum of $^7$Be
The Gamow shell model locates a double pole S-matrix singularity (exceptional point) for the 5/2^- resonances in 7Be, shown by coalescing wave functions, spectral functions, and singular spectroscopic factors plus electromagnetic transitions.
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Finite-Window Centered Organization of Neighboring Poles
A centered first-jet basis for neighboring quasinormal modes in finite time windows replaces the ill-conditioned sum of two resolved damped exponentials with a carrier plus t exp(-i omega_c t) term when the dimensionless splitting eta is small.