title: Very heavy solar cosmic rays: energy spectrum and implications for lunar erosion.
abstract: The energy spectrum of solar cosmic-ray particles of the iron group has been determined for the first time over the energy range from 1 to 100 million electron volts per nucleon by the use of glass removed from the Surveyor 3 spacecraft. The difference between the observed (energy)(-3) spectrum and the limiting spectrum derived previously from tracks in lunar rocks gives an erosion rate of 0 to 2 angstroms per year. High-energy fission of lead, induced by galactic cosmicray protons and alpha particles, has also been observed.
authors.forename: R L
authors.initials: RL
authors.lastname: Fleischer
authors.forename: H R
authors.initials: HR
authors.lastname: Hart
authors.forename: G M
authors.initials: GM
authors.lastname: Comstock