We have measured the energies and widths of the x-ray lines from the 4f→3d transition in antiprotonic atoms of ¹⁴N and ¹⁶O. The results are discussed in terms of a phenomenological optical potential. We have also observed the x-ray line from the 3d→4p transition in the antiprotonic ⁴He atom.
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Barnes et al. (1972) studied this question.