Anomalous absorption of proton partial waves by the nuclear optical potential is investigated for all the stable target nuclei over the range of energy 0–80 MeV and orbital angular momentum 0–13. It occurs with striking regularity very similar to those found for the neutron except that the l=0 anomalies are associated with resonance poles rather than antibound state poles, and the target-nucleus dependence of the anomaly is quite different. The latter is shown to be due to the symmetry term of the optical potential.

• Received 10 February 1986

DOI:https://doi.org/10.1103/PhysRevC.34.38