Abstract
A small thin NaI(Tl) scintillator has been used as both source and detector of photoprotons produced in sodium by 7Li(p, γ) radiation. This technique provides photoproton energy spectra of good resolution and high statistical precision. Spectra were obtained with both resonance and non-resonance radiation from the 7Li(p, γ) reaction which permit identification of protons produced by the 17.6 MeV component of the incident radiation. These protons correspond to transitions to states in 22Ne at energies of 0 (0.31 mbn), 13 (2.5mbn), 3.3 (0.6 mbn), 4.4 (0.9 mbn), 5.4 and 5.7 MeV (approximately 2mbn for both). This experiment establishes the existence of 22Ne levels at the three highest energies. Previous evidence for a level between 4 and 5 MeV is discussed and is found to be compatible with the present results.
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