# Breakdown of the isobaric multiplet mass equation for the A = 20 and 21 multiplets.

@article{Gallant2014BreakdownOT,
title={Breakdown of the isobaric multiplet mass equation for the A = 20 and 21 multiplets.},
author={Aaron Gallant and M. Brodeur and C. Andreoiu and Andreas Bader and A. Chaudhuri and U. Chowdhury and A. Grossheim and Ralph A. Klawitter and Anna A. Kwiatkowski and Kyle G. Leach and A. Lennarz and T. D. Macdonald and B. E. Schultz and J. Lassen and Henning Heggen and S. Raeder and Andrea Teigelh{\"o}fer and B. Alex Brown and A. Magilligan and Jason D Holt and J Fernandez Menendez and J. Simonis and Achim Schwenk and Jens Dilling},
journal={Physical review letters},
year={2014},
volume={113 8},
pages={
082501
}
}
Using the Penning trap mass spectrometer TITAN, we performed the first direct mass measurements of (20,21)Mg, isotopes that are the most proton-rich members of the A = 20 and A = 21 isospin multiplets. These measurements were possible through the use of a unique ion-guide laser ion source, a development that suppressed isobaric contamination by 6 orders of magnitude. Compared to the latest atomic mass evaluation, we find that the mass of (21)Mg is in good agreement but that the mass of (20)Mg… Expand
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