Pionic x-rays and the neutron radius of 44Ca
1979
Abstract Differences between strong interaction level shifts and widths for 2p states in pionic atoms of 44,40 Ca have been measured. Analysis in terms of an effective pion-nucleus potential leads to a difference in neutron rms radii of r n (44)− r n (40) = 0.05 ± 0.05 fm.
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