Forward neutron production at the Fermilab Main Injector

We have measured cross sections for forward neutron production from a variety of targets using proton beams from the Fermilab Main Injector. Measurements were performed for proton beam momenta of 58, 84, and $120\text{ }\text{ }\mathrm{GeV}/c$. The cross section dependence on the atomic weight ($A$) of the targets was found to vary as ${A}^{\ensuremath{\alpha}}$, where $\ensuremath{\alpha}$ is $0.46\ifmmode\pm\else\textpm\fi{}0.06$ for a beam momentum of $58\text{ }\text{ }\mathrm{GeV}/c$ and $0.54\ifmmode\pm\else\textpm\fi{}0.05$ for $120\text{ }\text{ }\mathrm{GeV}/c$. The cross sections show reasonable agreement with FLUKA and DPMJET Monte Carlos. Comparisons have also been made with the LAQGSM Monte Carlo.