Abstract
The energy and line width of the π − 22Ne 2pls X-ray transition have been measured using an isotopically pure liquid 22Ne target and a Compton suppression system. The values obtained are for the energy 230.9±0.3 keV, and for the width 10.8±0.7 keV. The data from a previous measurement on natural neon have been reanalyzed using these values. Revised values for 20Ne are for the energy 239.2±0.12 keV, and for the width 15.5±0.2 keV. Calculations with several versions of the optical potential have been carried out to investigate the sensitivity to the isovector and matter distribution parameters. Whike the measured energy agrees well with the calculations, the strong interaction width differs from most theoretical values by about 2 keV. Comparison with the previous result on natural Ne shows a strong isotope effect in the width of the 1s level.
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