Calculations have been carried out to determine the neutron flux induced in the earth's atmosphere by galactic protons and alpha particles at solar minimum for a geomagnetic latitude of 42°N. Neutron flux spectra in the energy range ∼10−8 to ∼105 Mev at various depths in the atmosphere were calculated by using Monte Carlo and discrete ordinates methods, and various comparisons with experimental data are presented. The magnitude and shape of the calculated neutron leakage spectrum at the particular latitude considered support the theory that the cosmic ray albedo neutron decay (Crand) mechanism is the source of the protons trapped in the inner radiation belt.

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This report mat prepared as an account of work sponsored by the United States WBfftmm* Neither the United States nor the Untied States Atomic Encnjy Commission, nor any of then employees, nor any of thev contractors, subcontractors, or their trnploytsi. makes any warranty, express or imptad. or assumes any topi liability or lespomPitttv for the accuracy, completeness or usefulness of any information, apparatus, product or process disclosed, or represents that ••* use would not mfmae* privateli owned nphts. ORNL-4869 UC-32-Mathematics and Computers Contract No tf-7405-eng-26

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