Evaluation of the CRAND Source for 10- to 50-Mev trapped protons

Proton intensities in two energy channels covering the range from 10 to 50 Mev, measured in November 1965, with directional detectors on the OV1 2 (1965-78A) spacecraft, are reported. For L < 1.4 the intensities are greater than those reported by Freden, Blake, Paulikas (1965) for August 1964 by an amount that is just barely significant. Such differences do not appear at larger L values out to 2.1. The measured intensities are compared with the intensities predicted from cosmic-ray albedo neutron decay (CRAND) by Hess and Killeen (1966). The measured intensities are higher by factors of 100 and more in some regions. From this result, and from a review of the CRAND theory, we conclude that CRAND is not the principal source of 10- to 50-Mev protons in the inner zone.