Study of a Long Counter Neutron Detector for the Cosmic-Ray-Induced Neutron Spectrum

A Long-Counter-type neutron detector was designed as a standard directional flow detector for energies up to 10 MeV. To use the Long Counter as a ground-based neutron monitoring instrument for an isotropic cosmic-ray neutron flux and to extend its use to energies up to several hundreds of MeV, its response must be evaluated for this specific radiation field. We have developed a simulation of the Long-Counter-type neutron detector response for energies of the cosmic-ray-induced neutron spectrum using the Monte Carlo codes MCNP and MCNPX.