## The absolute yield of low-energy neutrons from 190-Mev proton bombardment of Gold, Silver, Nickel, Aluminum, and Carbon |

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14-Mev neutron bombardment 190-Mev proton bombardment 20 cone 90 data angular distribution angular variation atomic weight average number beam clippers Blatt and Weisskopf brass shielding calculate center-of-mass velocity collisions correction Coulomb barrier cyclotron differential cross section elastic scattering element emulsion surface energy spectra estimated evaporating nucleus evaporation process evaporation theory Fermi gas foils inverse reaction leave the emulsion low-energy neutrons mass number measured microns Monte Carlo method neutron capture neutron direction neutron energy interval NEUTRON ENERGY Mev neutron flux neutron yield neutrons emitted neutrons from 190-Mev neutrons of energy nuclear emulsion nucleons number of neutrons number of proton number of tracks observed obtained plotted production of neutrons projected angle proton recoils range recoils produced reticle unit scanner scattered neutrons shown are statistical shrinkage factor solid angle space angle spectrum statistical errors steradian taken from Blatt uncertainty versus neutron energy yield of neutrons