Inclusive production of neutrons in 300-GeV/cppinteractions

An estimate of the average number of neutrons in 300-GeV/c $\mathrm{pp}$ collisions can be made from observed neutron secondary interactions (stars). The data are from a 35000-picture exposure of the Fermi National Accelerator Laboratory 30-in. hydrogen bubble chamber. The average number of neutrons and antineutrons per inelastic collision is found to be $〈n〉+〈\overline{n}〉=0.8\mathrm{}\pm 0.2$, and their average laboratory energy is ∼ 34 GeV.