Precise Atomic Mass Differences Involving Isotopes of Nd, Sm, Cd, and Pb

Abstract

During the past year, certain of our experimental techniques have been re-evaluated and modified. In the course of these investigations, we have re-determined two atomic mass differences involving isotopes of cadmium and one involving isotopes of lead. The new values are consistent with reaction data and with our older measurements. Thirteen mass differences involving isotopes of neodymium and samarium have also been determined, several for the first time. These new results are consistent with reaction data and with other recent mass spectroscopic data, but indicate that our previously-reported mass differences in the neodymium-samarium region are systematically too large by small but real amounts. An unusually concordant situation now exists in this region of the mass table.