Basic concept for an accelerator-driven subcritical system to be used as a long-pulse neutron source for Condensed Matter research - Vivanco R; Ghiglino A; De Vicente J; Sordo F; Terrón S; Magán M; Perlado J; Bermejo F (Nuclear Instruments & Methods In Physics Research Section A-Accelerators Spectrometers Detectors And Associated Equipment, 2014)