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Physical Review Letters – 11 March 2005
Volume 94, Issue 9

N-Z chart of the average p-n interaction energy of the last protons with the last neutrons in nuclei near Pb, extracted from a new, more extensive nuclear-mass tabulation. High energies are in red & pink; low energies in blue. In both the Z ≤ 82, N ≤ 126 and the Z > 82, N > 126 regions, the orbits of the last protons overlap strongly with the last neutrons and the p-n interactions are correspondingly larger there. [R. B. Cakirli, D. S. Brenner, R. F. Casten, and E. A. Millman, Phys. Rev. Lett. 94, 092501 (2005)]

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