Gamma Rays from the Proton Bombardment of Natural Silicon

Abstract

The gamma-ray yield curve was observed when thin targets of natural silicon were bombarded with monoergic protons in the energy range of 300 to 1840 kev. In order to take small steps in proton energy, a target potential modulation technique was used. Fifty-five resonances were observed, all but fifteen of which have been observed elsewhere using targets enriched in ${\mathrm{Si}}^{29}$ or ${\mathrm{Si}}^{30}$. The fifteen resonances at 369, 1096, 1134, 1204, 1290, 1382, 1472, 1484, 1507, 1570, 1598, 1617, 1625, 1630, and 1653 kev are presumed due to the ${\mathrm{Si}}^{28}$+$p$ reaction.