A Determination of the High Altitude Latitude Dependence in Cosmic-Ray Neutron Intensity

High altitude flights have been made with balloon-borne neutron-detecting equipment at 30.4°N and 54.7°N geomagnetic latitudes. A maximum neutron density was found at an absorption depth of 110 g/${\mathrm{cm}}^2$ at 30.4°N and 100 g/${\mathrm{cm}}^2$ at 54.7°N. The maximum neutron density at 54.7°N is approximately 2.9 times as great as the maximum neutron density measured at 30.4°N. The total integrated neutron density at 54.7°N is approximately 2.4 times as large as that at 30.4°N. These results indicate a greater latitude effect for neutron densities than for total ionization, but less than for primary particles, thus corroborating present theories of neutron formation.