2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/151624We present an elementary model of the collapses and revivals in the visibility of the interference between two atomic Bose-Einstein condensates. We obtain different predictions of the revival times whether we conserve or break atom number conservation from the outset. The validity of Bose-broken symmetry can be tested by observations of these collapses and revivals.4 pages, 1 PostScript figure, submitted to PRLStatistical MechanicsQuantum Physicstext