The enriched isotopes of samarium were bombarded with 6.7-Mev protons. A well-defined 13.7-hour activity was measurable in all of the enrichments. Comparison of relative initial saturation intensities clearly indicated that the activity should be assigned to ${\mathrm{Eu}}^{150}$. The activity is the result of negatron emission. The negatron spectrum has maximum energy of 1.07 Mev, and is classified as a first-forbidden transition on the basis of the $log(\mathrm{ft})$ value.