Nuclear "Time-Delay" and X-Ray-Proton Coincidences near a Nuclear Scattering Resonance

The probability for production of $K$-shell x rays by protons elastically scattered from ${}_{}{}^{58}{}_{}{}^{}\mathrm{Ni}$ is observed to change as one varies the proton energy over the $s_{\frac{1}{2}}$ nuclear resonance at $E_p=3.151\mathrm{}$ MeV. The results are interpreted theoretically in terms of interfering products of atomic ionization and energy-dependent nuclear scattering amplitudes.