P. Goldhagen

TL;DR: In this paper, ground-based measurements of the cosmic-ray induced neutron flux and its energy distribution have been made at several locations across the United States using an extended energy Bonner sphere spectrometer.

TL;DR: MAXED as discussed by the authors applies the maximum entropy principle to the unfolding of neutron spectrometric measurements, and the solution spectrum is a non-negative function that can be written in closed form.

TL;DR: The atmospheric ionizing radiation (AIR) project made simultaneous radiation measurements with 14 instruments on five flights of a NASA ER-2 high-altitude aircraft, measuring the cosmic-ray neutron spectrum, total neutron fluence rate, and neutron effective dose and dose equivalent rates and their dependence on altitude and geomagnetic cutoff.

TL;DR: The problem of analyzing data from a multisphere neutron spectrometer to infer the energy spectrum of the incident neutrons is discussed and the code MAXED, a computer program developed to apply the maximum entropy principle to this problem is described.

TL;DR: The results for the measured cosmic-ray neutron spectrum, total neutron fluence rate, and neutron dose equivalent and effective dose rates, and their dependence on altitude and geomagnetic cut-off agree well with results from recent calculations of GCR-induced neutron spectra.