Anomalous Behavior of the (p, n) Analog Reaction on the Molybdenum Isotopes

Differential cross sections of the ($p, n$) reaction to the ground-state analogs of the stable Mo isotopes have been measured for proton energies between 16 and 26 MeV. The integrated cross sections deviate strongly from the linear dependence on $N-Z$ predicted by the $\overrightarrow{\mathrm{t}}·\overrightarrow{\mathrm{T}}$ form of the isovector interaction commonly used to describe quasielastic scattering.