Nuclear Pairs and Gamma-Radiation from Excited States ofO16

Abstract

The nuclear pairs and gamma-radiation from the reaction ${\mathrm{F}}^{19}\left(p\alpha \right){\mathrm{O}}^{16*}$ have been studied at several of the resonances from 840 to 1380-kev proton bombarding energy. The pair spectrum agrees well with that predicted theoretically for nuclear pairs, showing clearly that the pairs observed are not due to internal conversion of gamma-radiation. The end point observed yields 6.04±0.03 Mev for the location of the first excited state of ${\mathrm{O}}^{16}$. The gamma-radiation comprises at least two components, with relative intensities differing for the four resonances studied. The energies observed are 6.14±0.04 Mev and 6.99±0.05 Mev at the 873.5 and 1381-kev resonances, and 6.14±0.04 Mev and 7.09±0.06 Mev at the 939-kev resonance.