2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/202926A stored-muon-beam neutrino factory may require transverse ionization cooling of the muon beam. We describe recent progress in research and development on energy absorbers for muon-beam cooling carried out by a collaboration of university and laboratory groups.7 pages, 1 figure, presented at the 3rd International Workshop on Neutrino Factory Based on Muon Storage Rings (NuFACT'01), May 24-30, 2001, Tsukuba, JapanAccelerator PhysicsHigh Energy Physics - Phenomenologytext