FORMATION CROSS SECTIONS OF VARIOUS RADIONUCLIDES FROM Ni, Fe, Si, Mg, O, AND C FOR PROTONS OF ENERGIES BETWEEN 130 AND 400 MEV

Abstract

Formation cross sections of Co56, Mn54, Mn52, Cr51, V48, P32, and Be7 from Fe and Ni; of Na24, Na22, and Be7 from Si and Mg; and of Be7 from C and O have been measured for incident protons of energies between 130 and 400 Mev to assist in the interpretation of data on cosmic-ray-produced nuclides in iron and stone meteorites. Formation cross sections of Mn54, Mn52, Cr51, V48, and P32 are found to be a factor of 2 to 3 lower from Ni than from Fe, whereas those of Co56 are 20- to 50-fold higher than from Fe. Be7 cross sections from C are found to be almost the same as from O, within experimental uncertainties. Cross sections of Na24 and Na22 from Mg and Si are found to be relatively energy independent, whereas those of P32 and Be7 from Ni and Fe are found to increase rapidly with increasing energy. Some qualitative conclusions are drawn about the production of cosmogenic activities in meteorites.