Isomeric States ofNd141andSm143

Two previously unreported nuclear isomers which belong to the series having 81 neutrons and even numbers of protons have been found and studied. These are ${\mathrm{Nd}}^{141m}$ (half-life 63.7 seconds, gamma-ray energy 0.76 Mev) and ${\mathrm{Sm}}^{143m}$ (half-life 137 seconds, gamma-ray energy 0.68 Mev). The observed properties agree with the assignment of $h_{\frac{11}{2}}$ and $d_{\frac{3}{2}}$ to the upper and lower states, respectively, as predicted by the single particle model.