Employing a neutral kaon beam at the Argonne Zero Gradient Synchrotron, a high-resolution magnetic spectrometer, and a neutron detector, differential cross sections have been obtained in the forward direction [$0.045<|t|<0.18$ ${(\mathrm{G}\mathrm{e}\mathrm{V}/\mathit{c})}^{2}$] for the reaction ${K}_{L}^{0}p\ensuremath{\rightarrow}{K}^{+}n$. Previous studies of the time-reversed process in deuterium, ${K}^{+}d\ensuremath{\rightarrow}{K}^{0}p(p)$, have not yielded direct cross-section measurements in the forward direction because there is an inhibition of the non-spin-flip process in deuterium due to the Pauli exclusion principle. Nevertheless, our data are in agreement with the extracted free-neutron cross sections of deuterium studies as determined from the impulse and closure approximations.

..mu..m. The peak at 1.28 ..mu..m is absent in the catalase/H/sub 2/O/sub 2/ spectrum, but the peak at 1.64 ..mu..m is very evident. The spectra are interpreted as indicating the generation of free singlet oxygen (peak at 1.28 and 1.30 ..mu..m) in the case of the first two enzymes/H/sub 2/O/sub 2/ systems and the generation of predominately bound singlet molecular oxygen in the case of catalase/H/sub 2/O/sub 2/.