2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/81098The working notes which led to the physics demonstration ultracold neutron source that has been operated at Los Alamos are transcribed here. In addition to the transcribed notes, included are a Prologue that describes the path that led to be basic idea, and an Epilogue that describes some of the discoveries in the implementation of the idea.3 pages, 2 figuresNuclear Experimenttext