Atomic Masses from Palladium through Xenon

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Abstract
The atomic masses of 42 stable nuclides in the region from palladium through xenon have been measured with a double focusing mass spectrometer. Combined with nuclear reaction mass differences the data provide a table of 74 mass values between mass numbers 102 and 136. A fit of the Wigner semi-empirical mass formula to these values reveals an irregularity at the magic number of 50 protons similar in nature to those previously reported from this laboratory at 20 and 28 protons. Also evident is an inability of the formula to account for the binding energy variations between isobaric nuclei. An empirical modification of the formula is observed to correct largely for this latter effect.