AbstractEnergy spectra of delayed neutrons from the precursors93,94,95Rb and143Cs have been measured by use of an on-line mass spectrometer and a3He neutron spectrometer. Details of the experimental techniques, data analysis, and error estimates are given. A comparison of delayed-neutron spectra for87Br,93,94,95Rb, and143Cs measured by three different laboratories is presented. Peak structures are reproduced by all laboratories, but the relative intensities below 200 keV vary according to different measurement or data analysis techniques.