https://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19720010018.pdf Abstract: The shapes of the energy spectra of neutrons between 20 and 400 MeV emitted at 20°, 34°, and 90° in the bombardment of C (1.8 g cm-2), Al (1.7 g cm-2), Co (4.4 g cm-2), and Pt (81.5 g cm-2) targets by 3-GeV protons have been measured by time-of-flight techniques. accelerator_measurement_of_the_energy_spectra_of_neutrons_emitted_the_interaction_of_3-gev_protons_with_several_elements.pdf
