2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/104335The most general one dimensional reaction-diffusion model with nearest-neighbor interactions solvable through the empty interval method, and without any restriction on the particle-generation from two adjacent empty sites is studied. It is shown that turning on the reactions which generate particles from two adjacent empty sites, results in a gap in the spectrum of the evolution operator (or equivalently a finite relaxation time).8 pagesStatistical Mechanicstext